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H337NP Operations & Maintenance Manual

1. 14 101 5101 1 0 5 eh uH i u EXT 4 A ete SERRE mu 102 P202 101 144 Ri eee sr 2 8 9 C5 L ds T 2PAS 3 COMPUTER 5 RS RAD REF 6 10 ADC zieren Ads Cis eg RA REF R39 Y 5 R43 FUNCTION SELECT 81 on analog pcb to NORM READING or STD DAY READING 4 ANALOG PCB TEMP SELECT SW14 to NORMAL v J4 TEMP RPM Figure 4 2 Engine Temperature Measuring Circuit Simplified Schematic COMPUTER PCB 201 P201 1 EE see SELECT sw ul n B R20 15 101 5101 RIJ R43 3 516 U5 RSI 4 R48 1 ui PROBE SIG 19 EXC Y 5Y REF EXT Testen Rao y m0 39 15Y R48 ANALOG PCB y Required Switch Position FUNCTION SELECT S1 on analog pcb to NORM READING STD DAY READING or AIRCRAFT INDICATOR ON TEMP SELECT SW14 to JS Figure 4 3 Measuring Circuit Simplified Schematic 4 4 THIS DOCUMENT IS SUBJECT TO THE LEGEND RESTRICTIONS ON THE TITLE PAGE 4 9 INSULATION RESISTANCE MEASURING CIRCUIT A constant current gener ated by the 5 supply and the circuitry of U1 and Q1 figure 4 4 flows through the unknown insulation
2. 13 Press ENTER Display will read T 1 2 3 4 READING CAL SEE EQUALS NOW COMPLETE SERVICE VOLTS IN HG or P S l MANUAL where 1 is the newly calculated span value and 2 is the current internal pressure transducer reading Span value of display 1 should equal high cal pressure low cal pressure full scale pressure 5 000 volts 0 25 14 Scale transducer per paragraph 5 18 15 Perform step 7 Left Blank Intentionally Hevised 4 12 90 5 10 THIS DOCUMENT 15 SUBJECT TO THE LEGEND RESTRICTIONS ON THE TITLE PAGE Left Blank Intentionally 5 8 Insulation Resistance Calibration 1 Set mode switch to 9 Display will read NOTE continue when SEE SERVICE MANUAL appears press ENTER If ENTER ACCESS 1 0 appears use LEFT RIGHT and INCREMENT switches to set access identification to H337N and then press ENTER Display 2 appears only if tester has been turned off since the last time access identification was set 1 2 3 4 SEE 2 ENTER CAL PUT IN SERVICE ACCESS 1 0 INSULATION _ INSULATION MANUAL RESISTANCE POSITION Display 2 appears only if FUNCTION SELECT switch is not in INSULATION position 2 Turn FUNCTION SELECT switch to INSULATION Display will read PUTOK J4 NOTE 44 is TEMP RPM connector RD XXXX K 3 Connect resistance decade 2 table 5 1 to pins A TEMP RPM connector and set resistance to 0 oh
3. 30 31 32 33 34 35 36 37 38 INDICATOR OR CONTROL DTR lam or ON LINE lamp Power switch ON or POWER lamp TEST FEED switch F E indicator ON LINE switch FEED switch Head Helease Lever Paper Advance Knob FUNCTION Indicates when printer is ready to receive data If ON LINE lamp is off press ON LINE switch to light lamp and enable printer Applies power to printer when PRINTER ACCESS door is open Indicates when power is applied to printer A three position switch Center position is used for normal operation Momentarily putting switch in TEST position starts a 385 line test printout Test may be ended by momentarily putting switch in FEED position FEED position advances paper Paper full empty indicator indicates relative amount of paper remaining on roll Toggles printer between on line and off line status as shown by the ON LINE lamp The printer will not go on line if it is out of paper the head release lever is in the up position or if some other error condition exists Switch is used with FEED switch to initiate a self test If printer is off line pressing switch causes cur rent line to be printed Holding switch causes additional paper to be fed until the switch is released Switch has no effect when printer Is on line Raises print head from roller when installing new roll of paper Advances paper to provide blank space be tween printout and tear off point Ad
4. buy sell rent or trade in this product please click on the link below http www avionteg com Howell Instruments H337NP 107 Engine Test Set Analyzer aspx AvionTEq OMOBLUBOBUEBDO Test with full trust www avionteg com OPERATION AND MAINTENANCE INSTRUCTIONS H337 SERIES ENGINE TEST SET THIS SERVICE MANUAL IS EFFECTIVE SERIAL NUMBER 400 AND SUBSEQUENT AND PRIOR UNITS CONTAINING SOFTWARE H101 228 REV 4 01 HOWELL INSTRUMENTS INC Fort Worth Texas 15 SEPTEMBER 1988 Change 4 7 NOVEMBER 1994 This document discloses subject matter in which HOWELL INSTRUMENTS INC has proprietary rights and such sub ject matter shall not without the written permission of HOWELL INSTRUMENTS INC be either a used released or disclosed in whole or in part outside any Company or the Government b used in whole or in part by the Company or the Government for manufacture or c used by a party other than the Company or the Government except for i emer gency repair or overhaul work only by or for the Company or the Government where the item or process concerned is not otherwise reasonably available to enable timely performance of the work provided that the release or disclosure hereof outside the Company or the Government shall be made subject to a prohibition against further use release or disclosure or ii release to a foreign government as the interest of the United States may require only for information or evaluation within
5. of TAMB connector Connect two other leads to other terminal and to pins and D 6 Set resistance decade to 76 33 ohms 7 Press ENTER Reading will become 60 0 C and then display will read R T D 100 C 85 C PUT138 50HM or PUT132 80HM Serial number 339 RD 60 0 C RD 60 0 C and subsequent NOTE Pressing CHANGE button when a high calibration point is displayed in mode 6 causes display to momentarily read CALIBR NOT COMPLETE and then to to initial displays of mode 8 Set resistance decade to 138 50 or 132 80 ohms as applicable 9 Press ENTER Reading will become 100 0 C or 85 0 C and then display will read Revised 25 May 88 d 5 3 THIS DOCUMENT 15 SUBJECT TO THE LEGEND RESTRICTIONS ON THE TITLE PAGE 1 2 3 4 CAL SEE TEMP CAL COMPLETE SERVICE CALIBRATE T G OR R T D MANUAL 10 Disconnect resistance decade from tester 11 Make calibration setup of figure 5 1 ICE COLD JUNCTION TEMP RPM VOLTAGE STANDARD 2 Figure 5 1 Thermocouple Input Calibration Setup 12 Use CHANGE button to select T C and press ENTER Display will read 1 2 S 4 T C PUT IN PUT PUT 32 CALIBRATE NORM READ TEMP SW F OMV POSITION IN NORMAL RD 13 Turn FUNCTION SELECT switch to NORM READING and TEMP SELECT switch to NORMAL 14 Set voltage standard to 0 000 mvdc 15 Press ENTER Reading will become 32 F and then display will read PUT 1832
6. 1 Perform steps 1 5 of paragraph 5 11 2 Use CHANGE button under SCALING AND CALIBRATION access door to step to the following displays 1 2 INTERNAL PUT 0 00 V TRANSDUCER 13 12 VOLT CALIB RD X XXX V 3 Connect voltage standard table 5 1 to pins 12 and 13 of 5104 figure 5 3 4 Set voltage standard to 0 000 5 Press ENTER Reading will become 0 000 V and then display will read PUT 5 00 V 13 12 RD 0 000 V 6 Set voltage standard to 5 000 7 Press ENTER Reading will become 5 000 V and then display will read 1 2 EXTERNAL PUT 0 00 V TRANSDUCER J6C B VOLT CALIB R D X XXX V This completes the internal transducer voltage calibration 8 Turn MASTER POWER switch off 9 Disconnect voltage standard from tester reconnect jumper plug P104 and reinstall deck assembly in case 5 15 THIS DOCUMENT IS SUBJECT THE LEGEND RESTRICTIONS ON THE TITLE PAGE 5 14 SCALING INSTRUCTIONS 5 15 TEMPERATURE SCALING Temperature scaling is used to select the engineer ing units or F of ambient temperature and engine temperature and the engine temperature calibration curve chromel alumel or TF30 for each engine type tested 1 Turn mode switch to 2 Display will read 1 2 TEMP SELECT SCALING ENG TYPE XX where XX is the position of the ENGINE TYPE SELECT switch 2 Turn ENGINE TYPE SELECT switch to desired position 3 Press ENTER Disp
7. sure Setting may also be used to remove offset from internal pressure transducer readings and external absolute type pressure transducer readings Set current uncor rected barometric pressure as follows 1 Turn FUNCTION SELECT switch to PAMB SET Display will read SET PAMB XX XX IN HG 2 Use LEFT RIGHT and INCREMENT switches to set value and press STORE Display will read 1 2 OK YES NO OFFSET INTERNAL or EXTERNAL where selected answer to offset question YES or NO will be flashing and INTERNAL or EXTERNAL corresponds to position of PRESSURE SELECT switch 3 If PAMB setting is not to be used to remove offset from internal and external pressure transducer readings proceed at paragraph 4 22 4 If PAMB setting is to be used to remove offset from internal and or external pressure transducer readings select desired transducer with PRESSURE SELECT switch and YES with CHANGE button under SCALING AND CALIBRATION access door Press ENTER Display will read 1 2 3 PUSH SET INTERNAL or EXTERNAL SETPAMB TO PAMB READING XX XX IN HG or 1 MBAR IN HG Press SET TO PAMB button before display 3 appears If desired remove offset from other transducer during this time by changing position of PRESSURE SELECT switch and pressing SET TO PAMB before display 3 appears 4 21 Revised 9 22 88 THIS DOCUMENT IS SUBJECT TO THE LEGEND RESTRICTIONS ON THE TITLE PAGE 4 22 SETTING TAMB
8. 3 H 0 06696 fsc 21 596 0 00896 input x 0 002596 rng 0 00596 input x 0 00196 rng 5 3 CALIBRATION INSTRUCTIONS 9 4 EXTERNAL CALIBRATION 5 5 Temperature Calibration 1 Connect power cable to POWER INPUT connector and to appropriate power source 2 Turn MASTER POWER switch on THIS DOCUMENT IS SUBJECT TO THE LEGEND RESTRICTIONS ON THE TITLE PAGE 3 Set mode switch under SCALING AND CALIBRATION access door to 6 Display will read NOTE To continue when SEE SERVICE MANUAL appears press ENTER If ENTER ACCESS I D appears use LEFT RIGHT and INCREMENT switches to set access identification to H337N and then press ENTER Display 2 appears only if tester has been turned off since the last time access identification was set 1 2 3 4 SEE ENTER TEMP CAL SERVICE ACCESS CALIBRATE OR R T D MANUAL e Selected input T C engine temp or R T D TAMB will be flashing Use CHANGE button under SCALING AND CALIBRATION access door to select R T D 4 Press ENTER Display will read 1 2 3 R T D PLACE R T D 60 C PROBE RESISTOR PUT76 33 OHM CALIBRATE 45 A B C D Pressing CHANGE button when a low calibration point is displayed in mode 6 causes high calibration point to be displayed Use four leads of equal length in the following calibration setup 5 Connect two leads to one terminal of resistance decade 1 Table 5 1 and to pins and
9. A logic 0 on a control line turns a switch on Top View Ad OUT 1 IN 1 GND IN 4 OUT 4 A 15 10814 3 TO 8 LINE DECODERS DEMULTIPLEXERS These Schottky clamped TTL MSI circuits are designed for use in high performance memory decoding or data routing applications These circuits decode one of eight lines dependent on the conditions at the three binary select inputs and three enable inputs Two active low and one active high enable inputs reduce the need for external gates or inverters when expanding An enable input can be used as a data input for demultiplex ing applications Circuit operation is summarized in the function table DATA OUTPUTS Vcc YO Yi Y2 Y3 Y4 Y5 Y6 Y3 Y4 A B G2A 628 YT GND OUTPUT SELECT ENABLE FUNCTION TABLE ENABLE SELECT didis B YO Yl Y2 Y3 Y4 Y5 Y6 YT X gt II I I I 2 X L H H H H H H H H rrrerrrronxI U x TIrri izrra gt Y ILLILZIZIIIIPIl 5 I ITXTITIIIIII TEIL IE ee gt MEILE ELITE H G 2 G2A G2B HIGH LEVEL L LOW LEVEL X IRRELEVANT A 16 C10815 OCTAL BUFFERS AND LINE DRIVERS WITH 3 STATE OUTPUTS These octal buffers and line drivers are designed specifically to improve both the perfor mance and density of three state memory address drivers clock drivers and bus oriented receivers and
10. MASTER 510 SW P12 4 241512 5 28V B EXT AA 084 A PRESS 8401 3 P402 gt S301 P401 POWER SUPPLY BOARD 5v BH27171 2 Ed gun gt 21 BH26575 S303 P303 5 5203 2 BOARD BH26575 1 82 up RO TUR ANALOG ic mr ACFT INSTR TEMP 5101 BOARD BH 26637 1 TO TEMP SELECT SW TEMP RPM OPTION Figure 4 10 Power Flow Block Diagram 4 11 THIS DOCUMENT IS SUBJECT TO THE LEGEND RESTRICTIONS ON THE TITLE PAGE 4 17 OPERATION INSTRUCTIONS 4 18 INDICATORS AND CONTROLS Tester indicators and controls are illustrated and listed with their functions in Figure 4 11 Test setups used with specific aircraft and engines are illustrated in Section VIII 1 2 3 4 5 6 7 8 9 10 11 12 APM INPUT T TEMPPRPA rus ER OHER 1 27 mh J O 0 0 A 13 ae yum Kasse _ TOT ZERO PRINT STORE AIRCRAFT INSTRUMENT 26 pine os care 25 mO man 24 23 22 Figure 4 11 Tester Indicators and Controls Sheet 1 of 7 Change 2 4 12 INDEX NO 10 11 12 THIS DOCUMENT IS SUBJECT TO THE LEGEND RESTRICTIONS ON THE TITLE PAGE INDICATOR OR CONTROL INTERNAL PRESSURE port EXTERNAL PRESSURE connector TAMB connector AIRCRAFT INSTRUMENT RESISTANCE adjust AIRCRAFT INSTRUMENT TEMP adjust TEMP RPM connector
11. PAMB PEXH PEXT or TRQ Use CHANGE button to select the designator of external pressure that will appear in data printouts NOTE Since internal and external transducers measure different parameters tester will not allow same print designator to be assigned to both the internal and external transducer 4 Press ENTER Display will read VOLTAGE PRESSURE SCALING where selected scaling VOLTAGE or PRESSURE will be flashing Select desired scal ing with CHANGE button If VOLTAGE is selected proceed at step 5 If PRESSURE is selected proceed at step 13 i 5 Press ENTER Display will read LINEAR RATIO VOLT SCALE Revised 9 22 88 5 18 THIS DOCUMENT 18 SUBJECT THE LEGEND RESTRICTIONS ON THE TITLE PAGE NOTE Ratio must be selected when scaling external pressure signals for PWA 100 Series turboprop engines See RPM and Torque Scaling for PWA 100 Series Engines in Section VIII Difference Data Use CHANGE button to select the transducer type linear or voltage ratio that is to be scaled 6 Press ENTER Display will read V EQUALS YYYYY units where X XXX V is the default or previously set voltage and YYYY units is the default or previously stored display value and units Units will be flashing 7 Use CHANGE button to select desired display units FT LB IN HG PCNT MBAR or P S 1 NOTE If print designator PAMB was selected in step 3 for external pressure then tester will onl
12. assembly Slide the axle out of the used paper roll DO NOT DISCARD THE AXLE 4 Breakthe seal on the new roll of paper Tear off and discard the first layer of paper including the glue or tape seal Tear or cut cleanly for easy paper insertion Slide the axle into the new paper roll and position the axle with the new roll above the notches in the slide assembly Be sure the paper is fed from the top of the roll only the outside surface of the paper is treated for printing 5 Thread the paper into the paper slot and through the mechanism until it comes out the slot of the front panel The PAPER light on the front panel changes from on to flashing 6 Push down on the paper roll to seat the axle firmly into the bottom of the notches Make sure the paper passes straight through the mechanism then lower the head release lever The PAPER light should turn off 7 Pushthe slide back into the housing until the latches engage Press the front panel FEED button to check that the paper emerges smoothly from the mechanism Press the ON LINE button to resume operation 3 6 CABLE FOR OPTIONAL EXTERNAL PRINTER If an external printer is to be used prepare the interface cable as shown in figure 3 2 or 3 3 The printer used with the tester must be set to generate automatic linefeeds when sent carriage returns Change 4 3 2 THIS DOCUMENT IS SUBJECT THE LEGEND RESTRICTIONS ON THE TITLE PAGE 3 7 SETTING EXTERNAL PRINTER BAUD RATE 1 Conne
13. n at step 13 If GAUGE DIFF is selected proceed at step 20 19 Press ENTER Display will read VENT TRANSDUCER IN HG or P S 1 and one digit of current reading will be flashing Set reading to current barometric pres sure using LEFT RIGHT and INCREMENT switches 5 6 THIS DOCUMENT 15 SUBJECT TO THE LEGEND RESTRICTIONS ON THE TITLE PAGE 14 Press ENTER Display will read APPLY XX XX IN HG or P S l where one digit of full scale value XX XX set in step 11 will be flashing 15 Apply a full scale pressure near the value of XX XX to the transducer and use the and INCREMENT switches to change display until it is equal to the applied pressure T 16 Press ENTER Display will read 1 2 3 4 SPAN READING CAL SEE EQUALS NOW _ COMPLETE SERVICE X XXX VOLTS XX XX IN HG or 5 1 MANUAL where 1 is the newly calculated span value and 2 is the current external pressure transducer reading Span value of display 1 should equal high cal pressure low cal pressure full scale pressure x 5 000 volts 0 2 17 Scale transducer per paragraph 5 17 18 Set mode switch to 0 turn PRESSURE SELECT switch to EXTERNAL and apply a known pressure to the transducer Pressure display shall read desired pressure 0 276 If it does this completes the calibration and scaling of the external pressure transducer Proceed at step to calibrate external pressure transducers of othe
14. 10708 4 DIGIT EXPANDABLE SEGMENT DISPLAY CONTROLLER This display controller is an interface element with memory that drives a 4 digit 8 seg ment LED display It allows individual control of any segment in the 4 digit display The number of segments per digit can be expanded without any external components For example two controllers can be cascaded to drive 16 segment alphanumeric display The display controllers receive data information through 8 data lines a b DP and digit information through 2 address inputs 2 The input data is written into the register selected by the address information when CE and Write Enable WE are low and is latched when either CE WE return high Data hold time is not re quired A self contained internal oscilator sequentially presents the stored data to high drive TRI STATABLE output drivers which directly drive the LED display drivers are tive when the control pin labeled SOE 15 low and go into TRI STATE when SOE is high This feature allows for duty cycle brightness control or for disabling the output drive for power conservation The digit outputs directly drive the base of the digit transistors when the control pin labeled DIO is low When DIO is high the digit lines turn into inputs and the internal scanning multiplexer is disabled When any digit line is forced high by an external device usually another controller the data in
15. Byte Write Dw Active H Read and Write High Z Active Inhibit MODE VO POWER C10271 MICROPROCESSOR This is an 8 bit microprocessor that functions as the central processing unit CPU in National Semiconductor s NSC800 micro computer family Many system functions are incorporated on the device such as vectored priority interrupts refresh control power save feature and interrupt acknowledge The microprocessor is fully compatible with the Zilog Z80 instruction set It is housed in a 40 pin dual in line package Dedicated memories NSC810 and NSC830 have on chip logic for direct interface to the NSC800 Following are the functions of all input output pins Some of these descriptions reference internal circuits INPUT SIGNALS Reset Input RESET IN Active low Sets A 8 15 and AD 0 7 to TRI STATE high impedance Clears the contents of PC and registers disables interrupts and causes a reset output to be activated Bus Request BREQ Active low Used when another device is requesting the system bus is recognized at the end of the current machine cycle then A 8 15 AD 0 T IO M RD and WR are set to the high impedance mode and the request is acknow ledged via the BACK output signal Non Maskable Interrupt NMI Active low The non maskable interrupt generated by the peripheral device s is the highest priority interrupt request line Input
16. Connect connector S10 to transducer Close tester assembly per paragraph 5 30 10 Calibrate and scale internal pressure transducer per paragraphs 5 7 and 5 18 5 32 REPLACEMENT OF INTERNAL PRINTER 1 O OO O gt CO Open tester assembly per paragraph 5 30 Disconnect connector S11 from printer Mark and disconnect wires at printer terminal strip Remove four screws 4 figure 7 2 and two mounting bars 8 and remove printer Attach new printer to tester case using four screws 4 and two mounting bars 8 Reconnect wires to printer terminal strip Reconnect connector S11 to printer Load paper into printer per paragraph 3 3 Apply power to tester turn FUNCTION SELECT switch clockwise to second BUILT IN TEST position and test printer per paragraph 4 19 step 6 10 Close tester assembly per paragraph 5 30 5 33 REPLACEMENT OF DISPLAY BOARD COMPONENTS T Open tester assembly per paragraph 5 30 to gain access to the display board 26 figure 7 3 2 Determine if component to be replaced can be accessed without removing board 5 30 Dur THIS DOCUMENT IS SUBJECT TO THE LEGEND RESTRICTIONS ON THE TITLE PAGE If board must be removed then first disconnect connector S201 from computer board and P303 from display board 4 Remove four screws 9 and six washers 10 and disconnect computer board 8 from analog board 12 5 Hemove two screws 27 and two screws 2
17. INSULATION and TC RESISTANCE ZERO adjust RPM INPUT INSTR CABLE connector PRINT button EXTERNAL PRINTER connector STORE button POWER INPUT connector FUNCTION _ Allows either ambient pressure or some other pressure to be applied to the internal pressure transducer Makes excitation and signal connections to external pressure transducer cable Makes excitation and signal connections to ambient temperature cable Adjusts test circuit resistance to values required to test D Arsonval temperature indicators Adjusts level of test signal when testing an air craft temperature indicator Connects engine temperature and rpm signals to tester and connects aircraft temperature indicator test signal to test cable Zeros resistance display when measuring insula tion resistance and when measuring resistance of aircraft temperature circuit Connects engine rpm signals to tester in single engine applications Initiates printout of input data stored with STORE button and printout of tester calibration and scaling data Connects tester to external printer I O interface cable Stores date and identification number trim target ambient pressure setting ambient temperature setting and snapshots of input data Connects power to tester Figure 4 11 Tester Indicators and Controls Sheet 2 4 13 INDEX NO 13 14 15 16 17 18 19 20 21 THIS DOCUMENT 15 SUBJECT TO THE LEGEND RESTRI
18. Press CHANGE button to obtain each of the following displays 1 ENG T XX T C IN or F CURV CR AL or TF30 where XX is the position of the ENGINE TYPE SELECT switch 2 TAMB IN or F NOTE RPM NX NOT SCALED 3 RPM N1 F S XXXX HZ 4 XXXX HZ EQUALS YYYY HZ R P M PCNT or P P H 5 RPM N2 F S HZ 6 XXXX HZ EQUALS YYYY HZ R P M PCNT or P P H 7 RPM N3 F S XXXX HZ 8 XXXX HZ EQUALS YYYY HZ PCNT or P P H NOTE 5 23 THIS DOCUMENT 15 SUBJECT THE LEGEND RESTRICTIONS ON THE TITLE PAGE EXTERNAL 2l TRANSDUCER NOT CALIB 9 EXT XDCR SPAN X XXX V XXXX IN HG or P S 1 10 SCALING XXXX IN HG or P S I YYYY IN HG P S I FT LB MBAR or PONT NOTE If pressure or full scale reading was set to zero during an external pressure transducer scaling then display 10 will be replaced with the following display EXTERNAL TRANSDUCER NOT SCALED NOTE 4 y if span voltage or pressure was set to zero during an internal pressure transducer calibration then display 11 will be replaced with the following display and display 12 will not appear INTERNAL TRANSDUCER NOT CALIB 11 INT XDCR SPAN X XXX V XX XX IN HG or P S 12 SCALING 101 80 IN HG 50 00 5 1 or 3447 MBAR NOTE If pressure or full scale reading was set to zero or NOT SCALED was selected during an
19. When a TAMB probe is not connected to the tester ambient temperature must be set to the current value as follows 1 Turn FUNCTION SELECT switch to TAMB SET Display will read 1 2 SET SET OR READING PROBE XXX X C 2 Use LEFT RIGHT and INCREMENT switches to set value and press STORE 4 23 AIRCRAFT TEMPERATURE INDICATOR CALIBRATION 4 24 D Arsonval Indicators 1 Connect temperature cable to TEMP RPM receptacle and D Arsonval indicator adap ter to cable 2 Connect red and blue leads of adapter together 3 Turn FUNCTION SELECT switch to SET and adjust AIRCRAFT INSTRUMENT RE SISTANCE control until tester displays system resistance marked on aircraft indicator nameplate 4 Turn FUNCTION SELECT switch to INDICATOR CHK 5 Disconnect harness lead from indicator positive terminal and connect blue lead of adapter to this terminal 6 Connect red adapter lead to indicator negative terminal 7 Observe tester display and adjust AIRCRAFT INSTRUMENT TEMP control to desired test temperature 8 Difference between tester reading and aircraft indicator reading is error of aircraft in dicator and should not exceed technical manual tolerance 4 25 Null Balance Indicators 1 Connect temperature cable to TEMP RPM receptacle and null balance indicator adapter to cable 2 Disconnect aircraft harness from indicator and connect adapter to indicator 3 Turn AIRCRAFT INSTRUMENT RESISTANC
20. cable to POWER INPUT receptacle and to power source 3 Turn MASTER POWER switch on and allow a 15 minute warmup 4 Turn FUNCTION SELECT switch clockwise to first BUILT IN TEST position As tester performs built in tests display sequence will be as follows 1 2 3 4 DISPLAY 90909095909 0904 099 5 _ AAANAARAAA 5 6 7 CPU CPU BUILT IN HARDWARE HARDWARE TEST TEST TEST COMPLETE Display sequence repeats if FUNCTION SELECT switch is left in BUILT IN TEST posi tion Note that displays 2 through 4 test all segments of the display If tester fails this test refer to Section V NOTE If a printer is not used is disconnected is not turned on or is out of paper then display will read as follows In the next step 1 2 PRINTER NO TEST PRINTER READY 5 Open PRINTER ACCESS door and turn FUNCTION SELECT switch to next BUILT IN TEST position Display will continue to cycle through the following sequence as long as the switch is left in this position 1 2 3 4 H337N FT WORTH TEST HOWELL 3479 WEST TEXAS INSTR INC VICKERY 76107 THIS DOCUMENT 15 SUBJECT TO THE LEGEND RESTRICTIONS ON THE TITLE PAGE 5 6 817 PRINTER 336 7411 TEST COMPLETE While display goes through the above sequence printer prints the following ABCDEFGHIJKLMNOPORST UVWXYZabcdefghijklmn opgrstuvwxyz12345678 90 lt gt HOWELL INSTRUMENTS 3479 WEST VICKERY FORT WORTH TEXAS 76107 817 33
21. equals 100 0 PONT 10 Select print designator of PINT for internal pressure transducer and select 101 80 IN HG for the scaling per paragraph 5 18 11 Perform acceptance test procedure of Appendix 5 31 Change 1 THIS DOCUMENT 15 SUBJECT TO THE LEGEND RESTRICTIONS ON THE TITLE PAGE Notice Howell Instruments Inc no longer releases assembly drawings wiring schematics Functional Descriptions or illustrated parts lists except to authorized repair stations For repair or replacement please contact Howell Instruments Inc 8945 South Freeway Fort Worth TX 76140 817 336 7411 APPENDIX Descriptions Integrated Circuits A 1 GENERAL This appendix defines integrated circuits used in the tester The definitions are in Howell part number C number order The tester uses standard posi tive logic logic a low voltage false A logic 1 a high voltage true Signal names on schematic diagrams identify the logic 1 level The following table defines the logic levels CIRCUITRY LOGIC 0 LOGIC O LOGIC 1 LOGIC 1 INPUT OUTPUT INPUT OUTPUT TIL 0 8vde lt 0 4 2 0vde 2 4vde CMOS lt 30 0 05vdc 270 2 Vpp 0 05vdc The following top views of integrated circuits identify pin locations LAST PIN N PIN 1 Following is a list of the part numbers of circuits defined in this appendix 5617 10238 10354 10712 C10819 6157 10239 10708 C10814 C11270 C8108 C1
22. internal pressure transducer scaling then display 12 will be replaced with the following display Revised 9 22 88 5 24 THIS DOCUMENT 15 SUBJECT THE LEGEND RESTRICTIONS ON THE TITLE PAGE INTERNAL TRANSDUCER NOT SCALED 13 STANDARD DAY PRINT YES or NO 14 PRINT DESIGNATOR INT PINT PEXH or PAMB 15 PRINT DESIGNATOR EXT PAMB 16 EXTERNAL SCALED LINEAR OR RATIO 17 STORED DATA STORED SCALING CALIB Repeat steps 2 and 3 as desired for other engine types 5 22 PRINTING STORED CALIBRATION AND SCALING DATA 1 Set mode switch beneath SCALING AND CALIBRATION access door to 1 2 Turn ENGINE TYPE SELECT switch to desired position 3 Press PRINT button 4 Repeat steps 2 and 3 for printouts of additional calibration and scaling data Figure o 4 is a sample printout 5 23 INSPECTION AND PREVENTIVE MAINTENANCE 9 24 Other than calibrating the tester every 12 months there is no scheduled inspection or preventive maintenance 5 25 Revised 2 6 90 THIS DOCUMENT IS SUBJECT TO THE LEGEND RESTRICTIONS ON THE TITLE PAGE STORED SCALING AND CALIBRATION CONSTANTS ENGINE TYPE 2 T C IN DEG F CURVE TYPE CR AL TAMB IN DEG R P M FULL SCALE 70 00 HZ EQUALS 100 0PCNT R P M N2 FULL SCALE 70 00 HZ EQUALS 10000 R P M R P M N3 FULL SCALE 10000 HZ EQUALS 30000 EXTERNAL TRANSDUCER SPAN 5
23. is only recog nized at the end of the current instruction Its execution is independent of the interrupt enable flip flop NMI execution involves saving the PC on the stack and automatic branching to restart address 0066 in memory Hestart Interrupts A B C RSTA RSTB RSTO Active low Restarts generated by the peripherals are recognized at the end of the current instruction if their respective inter rupt enable bits and IFF1 IFF2 are set Execution is identical to NMI except interrupts are enabled for the following restart addresses NAME RESTART ADDRESS RSTA 003C RSTB 0034 RSTC 002C The order of priority is fixed highest first as follows 1 RSTA 2 RSTB 3 RSTC 10271 Continued Interrupt Request INTR Active low interrupt request input generated by peripheral device is recognized at the end of the current instruction provided that the in terrupt enable and master interrupt enable bits are set INTR 15 the lowest priority inter rupt request input Under program control INTR can be executed in three distinct modes in conjunction with the INTA output Wait WAIT Active low When set low during RD or WR the CPU extends its machine cycle increments t wait states The wait machine cycle continues until the WAIT input returns high Power Save PS Active low PS is sampled at the end of the current instruction cycle When PS is low the CPU stops executing at the end of current
24. the TEMP SELECT switch 4 5 Three counter port ram s U11 U13 on the computer board figure 4 1 provide the input output interface needed to read switch positions to accumulate data from analog to digital and synchro converters and to output data to printers These cir cuits also contain timers which provide the frequency measurement capability Each cir cuit contains 128 bytes of ram two 16 bit programmable binary down counters and 19 programmable 1 O bits arranged as three separate ports port A 8 bits port B 8 bits and port C 3 bits Each bit is individually definable as an input or output Port bits can be set or cleared individually and can be written or read in bytes Following is a list of the circuits with their functions COUNTER PORT RAM FUNCTIONS U11 port A Obtain data from ADC U17 and synchro converter 1PA bits U16 when used U11 port B Control ADC and synchro converter functions Sense 1PB bits tester switch closures 4 1 5 8 18 71 CLK 2 5 y CLOCK OSCILLATOR 2 Yi RI 215 CIE 10 8 ADORESS Bus RANDOM PROGRAM ACCESS OCTAL CHIP ENABLE MEMORY MEMOR Y DECODER GATING Ut U2 us COMPUTER PCB BH26575 1 pt gion 3 COMPUTER EIN TER y t6 LINE EAU PORTS PORT COUNTER PORT RAM 2 COUNTER PORT RAM 3 eet a PORTA PORTE FORTEC PORT
25. 000 VOLTS EQUALS 100 00 P S I SCALED TO 100 00 P S I EQUALS 100 00 5 INTERNAL TRANSDUCER SPAN 5 000 VOLTS EQUALS 101 80 IN HG SCALED TO 101 80 IN HG STANDARD DAY PRINT YES PRINT DESIGNATORS INTERNAL PINT EXTERNAL PEXT EXTERNAL IS LINEAR P Figure 5 4 Sample Printout of Calibration and Scaling Data 5 26 THIS DOCUMENT IS SUBJECT TO THE LEGEND RESTRICTIONS ON THE TITLE PAGE 5 25 TROUBLESHOOTING 5 26 GENERAL TROUBLESHOOTING PROCEDURES Note from parts lists in the ll lustrated Parts Breakdown Section VII that a circuit board assembly may contain several integrated circuits having the same part number Swapping locations of identi cal integrated circuits may provide a clue to a malfunction Care should be exercised when swapping gates to note which circuits are affected by the gates CAUTION Always remove power from the tester when removing or installing a circuit component The numbering of integrated circuit pins is explained in paragraph A 1 of Appendix A 5 27 TROUBLESHOOTING THE TESTER If the tester will successfully complete the display test built in test and the printer test of paragraph 4 19 then it is operationally ready If the display proves faulty during the display test then refer to figure 5 5 and table 5 2 If an error message is displayed during a built in test refer to table 5 3 for the possible cause and replace applicable integrated circuits until the malfunct
26. 0271 C10709 C10815 11310 10272 10710 10816 5617 DUAL D TYPE EDGE TRIGGERED FLIP FLOP Each flip tlop has independent data set reset and clock inputs and and outputs The logic level present at the D input is transferred to the Q output during the positive going transition of the clock pulse Setting or resetting is independent of the clock and is accomplished by a high level on the set or reset line respectively C6157 CTS 750 81 R4 7K RESISTOR NETWORK This package consists of seven 4 7K ohm resistors connected as shown in the following schematic PIN A 2 8108 RESISTOR NETWORK This network contains eight 22 ohm 1 4 watt resistors arranged as shown in the schematic 3 C10238 2048 WORD X 8 BIT HIGH SPEED STATIC CMOS RAM PIN ARRANGEMENT TOP VIEW PIN NAMES ADDRESS INPUTS DATA INPUTS OUTPUTS CHIP ENABLE OUTPUT ENABLE WRITE ENABLE 5V GROUND NO CONNECT MODE SELECTION Mode wom 10239 2K 8 ELECTRICALLY ERASABLE PROM E PROM This electrically erasable programmable read only memory is capable of storing 16 384 bits of data The data can be modified under program control A7 As As PIN NAMES ADDRESS INPUTS INPUTS OUTPUTS X2816A CHIP ENABLE OUTPUT ENABLE Ao WRITE ENABLE Oo 19 5V GROUND 11 NO CONNECT Vss Y O _ Standby High Z Standby LL H Read Active
27. 2 4 3 4 4 4 5 4 6 4 7 4 8 4 9 4 10 4 11 4 12 5 1 5 2 5 3 5 4 5 5 6 1 6 2 6 3 6 4 6 5 6 6 7 1 7 2 7 3 7 4 LIST OF ILLUSTRATIONS Title Page HS37 N Seres Endire Test SOP ras o cdi 1 2 Loading internal Printer Paper 3 1 External Printer Cable for RS232 Interface 3 2 External Printer Cable for Current Loop Interface 3 3 Computer System Block Diagram 4 2 Engine Temperature Measuring Circuit Simplified Schematic 4 4 TAMB Measuring Circuit Simplified Schematic 4 4 Insulation Resistance Measuring Circuit Simplified Schematic 4 5 Thermocouple Resistance Measuring Circuit Simplified Schematic 4 7 Aircraft Instrument Resistance Set Circuit Simplified Schematic 4 7 Aircraft Indicator Check Circuit Simplified Schematic 4 8 RPM Measuring Circuit Simplified Schematic 4 9 Pressure Measuring Circuit Simplified Schematic 4 10 Power Flow Block Diagram 4 11 Tester Indicators and Controls 4 12 Sample Printout of Stored Data 4 27 Thermocouple Input Calibration Setup 5 4 External Pressure Test Setup 5 7 Socket 104 Pin Identification 5 13
28. 2 Latch digit 2 Write digit 3 Latch digit 3 Write digit 4 Latch digit 4 Disable writing o 00000000 mk xh o O O O mm tt CO 0 xa On OA O Output Control oo eme 0 R R Refresh display Disable segment outputs Digits are now inputs Display digit 1 Display digit 2 Display digit 3 Display digit 4 R refresh digit lines sequentially pulsed X don t care A 12 10709 4 LINE TO 16LINE DECODERS DEMULTIPLEXERS These circuits decode four binary coded inputs into one of sixteen mutually exclusive outputs when both the strobe inputs G1 and G2 low The demultiplexing function is performed by using the 4 input lines to address the output line passing data from one of the strobe inputs with the other strobe input low When either strobe input is high all outputs are high Circuit operation is summarized in the function table No Ti l 1 E 13 3 3 10 E 01 23465 7 8 9 L Lye L L L H H H H H H H H H H H L LIL L L HH HH AHA AA H HH L LIL L HL HHLHHHHHHHHHHHHH L AHH HH AH AA HH L LIL H L L HHHHLHHHHHHHHHHH L LIL H IH H HHHL HHHHHH HH L LIL H HHHHHHLHHHHHHHHH L LIL H HH H H H H H HAL HH HH L LIH L L L HHHHHHHHLHHHHHHH L LIHL LH H H HH HH HH HL HH
29. 24 Turbojet Engine Trim Check 4 24 Turboprop Engine Trim Check 4 25 Displaying and Printing Data 4 25 DISPIAYING Data caos bus Sara ore dad ds 4 26 Printing Data aca ad EE RUE Ch ER E Sp Do ets 4 26 Section V TABLE OF CONTENTS Continued MAINTENANCE INSTRUCTIONS 5 1 ELIO 5 3 Calibration Instructions C 5 4 External Calibration 5 5 Temperature 5 6 External Pressure Transducer Calibration 5 7 Internal Pressure Transducer Calibration 5 8 Insulation Resistance Calibration 5 9 T C Resistance Calibretion 5 10 Internal Calibration 5 11 Cold Junction Calibration 5 12 External Transducer Voltage Calibration 5 13 Internal Transducer Voltage Calibration 5 14 Scaling Instructions 5 15 Temperature Scaling 5 16 RPM Scaling 5 17 External Pressure Transducer Scaling 5 18 Internal Pressure Transducer Scaling 5 21 Displaying Stored Calibration and Scaling Data 5 22 Printing Stored Calibration and Scaling Data 5 23 Inspection and Preventive Maintenance o 25 Troubleshooting 5 26 General Troubleshooting Procedures 5 27 Troubleshooting the Tester 5 28 Repair 5 29 General Repair Proced
30. 6 7411 PRINT TEST COMPLETE 4 20 SETTING IDENTIFICATION AND TRIM TARGET NUMBERS Ten characters common to all positions of the ENGINE TYPE SELECT switch may be used to set the date and or an identification number and an additional ten characters may be used to set a trim target Once set numbers appear in all subsequent engine data printouts until changed NOTE Changing identification number causes subsequent snapshot recording numbers to start over with 2001 Refer to paragraph 4 29 through 4 31 1 Turn FUNCTION SELECT switch to IDENT NO SET Display will read as follows SET DATE AND I D 10 characters Set date and or identification number using the 10 characters in the bottom row First four left hand characters may be set to 0 9 and remaining characters may be alphabeti cal or numerical Press up on the INCREMENT switch to change value of flashing character Hold INCREMENT switch in up position for continuous changes Use LEFT RIGHT switch to select other character positions 2 After making setting press STORE button Display will read 4 20 THIS DOCUMENT 15 SUBJECT TO THE LEGEND RESTRICTIONS ON THE TITLE PAGE SET TRIM TARGET 10 characters 3 Use LEFT RIGHT and INCREMENT switches to make setting 4 Press STORE button Display of step 1 returns 4 21 SETTING PAMB This setting should be made if engine pressure ratio is to be measured and external pressure transducer is not being used to measure ambient pres
31. 7 4 28 4 29 4 30 4 31 4 32 4 33 TABLE OF CONTENTS Continued Page General dod 4 1 Gomp ter 4 1 Engine Temperature Measuring Circuit 4 3 Ambient Temperature Measuring Circuit 4 3 Insulation Resistance Measuring Circuit 4 5 Engine TC Resistance Measuring Circuit 4 5 Aircraft Instrument Resistance Set Circuit 4 5 Aircraft Indicator Check Circuit TUN 4 6 RPM Measuring 4 6 Pressure Measuring 4 6 Display EB MIU ETE A 4 6 POWer SUDDIV Pee eee aa 4 6 Operation IASTUCUONS zus rac ea 4 12 Indicators and Controls 4 12 Power Up Procedure 4 19 Setting Identification and Trim Target Numbers 4 20 Setting TER 4 21 ogt nd TAMB correa OR ON dE Bee ced 4 22 Aircraft Temperature Indicator Calibration 4 22 D Arsonval indicators 4 22 Null Balance Indicators 4 22 Aircraft Circuit Resistance Adjustment D Arsonval Indicators 4 23 Aircraft Thermocouple System Insulation Resistance Check 4 23 Engine Trim Check Operation 4
32. 8 and remove display board 6 To reinstall display board attach board to deck assembly with two screws 27 and two screws 28 7 Reinstall computer board 8 using four screws 9 and six washers 10 8 Reconnect connectors S201 and P303 9 Close tester assembly per paragraph 5 30 5 34 REPLACEMENT OF PUSHBUTTON SWITCHES When installing PRINT STORE SET TO PAMB SET TO ZERO CHANGE or ENTER switch do not tighten nut more than 2 to 3 inch pounds to prevent damage to switch 5 35 TEST 5 36 The following procedures provide a complete acceptance test of the tester after repair 2 ENGINE TYPE SELECT switch to 8 and calibrate the tester per paragraphs 5 3 through 5 9 2 Scale temperature for engine type 8 using the chromel alumel curve per paragraph Scale temperature for engine type 9 in using the chromel alumel curve per paragraph 5 15 4 Scale temperature for engine type 10 in C using the TF30 curve per paragraph 5 15 5 Scale N1 for engine type 8 such that 70 00 Hz equals 100 0 PCNT per paragraph 5 16 6 Scale N2 for engine type 8 such that 10 000 Hz equals 10 000 R P M per paragraph 5 16 7 Scale N3 for engine type 8 such that 10 000 Hz equals 30 000 P P H per paragraph 5 16 8 Scale external pressure transducer for engine type 8 such that linear voltage of 5V equals 100 P S I per paragraph 5 17 9 Scale external pressure transducer for engine type 9 such that voltage ratio f 5V
33. A PORTE PORTC 3 4 DISPLAY DRIVERS 91 414 SEGMENT JUMPER ANALOG s FUNCTION SWITCHES a SELECT SW 93 16 1 56 PLUG PRINTER PRINTER PIO4 DRIVER 8 SEGMENT DISPLAYS 11 114 1 DISPLAY ANALOG TRIMMER ANALOG ANALOG PCB PCB DECK PCB PCB BH26573 1 AHZ6637 1 39Vd JIL AHL SNOLLOIH 5384 aN3947 OL 1O3P8NS SI LNSINfIOOQ SIHL THIS DOCUMENT 15 SUBJECT TO THE LEGEND RESTRICTIONS ON THE TITLE PAGE COUNTER PORT RAM FUNCTIONS 011 port Sense tester switch closures 1 PC bits 012 port A Multiplex inputs to amplifier U9 Select appropriate 2PA bits amplifier U9 offset circuit Multiplex signals in ADC 017 Switch constant current source on and off when making resistance measurements U12 port B Select appropriate amplifier U7 offset circuit for fre 2PB bits quency measurements Drive frequency timing logic U12 port C Multiplex frequency signals to frequency amplifier U7 2PC bits 013 port A Decode FUNCTION SELECT switch position Control SPA bits internal and external printer U13 port B sense tester switch positions bits U13 port C Sense presence of jumper plug P104 for internal SPC bits calibration mode 4 6 ENGINE TEMPERATURE MEASURING CIRCUIT The engine temperature sig nal from the engine thermocouples follows the path shown in figure 4 2 Switch posi tions required when measuring engine temperature are li
34. CTIONS ON THE TITLE PAGE INDICATOR OR CONTROL FUNCTION MASTER POWER switch Applies input power from POWER INPUT connector to tester TEMP SELECT When mode switch index no 22 is to 0 and switch FUNCTION SELECT switch index no 27 is to STD DAY READING NORM READING OR AIR CRAFT INDICATOR ON programs tester to dis play ambient temperature reading or setting when in TAMB position and to display engine harness temperatures when in NORMAL positions RPM SELECT switch Programs tester to display selected rpm input N1 N2 or N3 SET TO PAMB button used to remove offset from internal and exter nal absolute type pressure transducer readings when transducer is vented to atmosphere SET TO ZERO button Is used to remove offset from gauge differential type external pressure transducer readings when transducer is vented to atmosphere PRESSURE SELECT Depending on position of switch it programs tes Switch ter to display internal pressure transducer reading external pressure transducer reading or PAMB setting or epr if parameters PINT and PAMB are properly scaled Display Displays parameter calibration scaling data parameter readings and data indicator test signals resistance readings operator commands messages and built in test functions depending on position of mode switch first priority FUNCTION SELECT switch second priority and TEMP SELECT switch third priority ENGINE TYPE card Used by operator to re
35. E control fully counterclockwise 4 Turn FUNCTION SELECT switch to INDICATOR CHK 5 Observe tester display and adjust AIRCRAFT INSTRUMENT TEMP control to desired test temperature 4 22 THIS DOCUMENT IS SUBJECT TO THE LEGEND RESTRICTIONS ON THE TITLE PAGE 6 Difference between tester reading and aircraft indicator reading is error of aircraft in dicator and should not exceed technical manual tolerance 4 26 AIRCRAFT CIRCUIT RESISTANCE ADJUSTMENT D ARSONVAL INDICA TORS 1 Connect temperature cable to TEMP RPM receptacle and D Arsonval indicator adap ter to cable 2 Connect red terminal of adapter to brass lug of adapter 3 Turn FUNCTION SELECT switch to T C RESISTANCE 4 Adjust ZERO control for a zero reading on the tester 5 Disconnect red terminal of adapter from brass lug and connect it to aircraft harness at negative indicator terminal 6 Disconnect the positive harness lead from indicator and connect it to brass lug of adapter CAUTION Check and clean all connections in aircraft thermocouple system before adjusting spool 7 Resistance displayed on tester should be within technical manual tolerance If it is not adjust resistance spool in aircraft 4 27 AIRCRAFT THERMOCOUPLE SYSTEM INSULATION RESISTANCE CHECK 1 Connect temperature cable to TEMP RPM receptacle and indicator adapter to cable 2 Connect small insulation check ground lead to pin jack on temperature cable and clip it to brass lu
36. ECT S1 on analog pcb to TC RESISTANCE TEMP SELECT SW14 to TAMB or NORMAL J4 TEMP RPM Figure 4 5 Thermocouple Resistance Measuring Circuit Simplified Schematic SV REF i COMPUTER PCB DADO 2 2PA3 2PAS L 6102 202 RAR e ANALOG E En COMP JCT vi Cru 4 gt A 83 INSTR TESTER DECK m EAE Bagulred Switch Positions FUNCTION SELECT S1 on analog pcb to SET ACET TEMP SELECT SW14 to TAMB or NORMAL IND Connector Idenilfication Figure 4 6 Aircraft Instrument Resistance Set Circuit Simplified Schematic 4 7 THIS DOCUMENT IS SUBJECT TO THE LEGEND RESTRICTIONS ON THE TITLE PAGE TESTER ANALOG TESTER DECK i DECK er RE Pio si p101 S101 R5 ACFT y R8 Ni INSTR EN TEMP 5 INSTA Y i RES URN COMPUTER EHE meL 25 R44 COMP S102 P202 ICT E L L 2PAS NEED FUNCTION SELECT 51 on analog pcb to INDICATOR CHK TEMP SELECT SW14 to TAMB or NORMAL eclor id J4 TEMP RPM EXT ADC UN R12 Figure 4 7 Aircraft Indicator Check Circuit Simplified Schematic 4 8 THIS DOCUMENT IS SUBJECT TO THE LEGEND RESTRICTIONS ON THE TITLE PAGE FREQUENCY INPUTS EXT 1 TESTER DECK 6 501 rw ANALOG ISOLATION PCB TRANSFORM
37. EEE a OUS A AE 0 Ao aep 4 dus Gt Wb um UD UU Gm mb 49 0 iu en ORA D US ND Replace defective component Me M Gc c m cro um c TU CP ow 55 NP A up ER RD Ae UN UD Um 4 AM GE GE UD wm WR RA A um UR WD GR GM PU ue qm dae u cum um NND gt o Replace THIS DOCUMENT 15 SUBJECT TO THE LEGEND RESTRICTIONS ON THE TITLE PAGE Table 5 3 Bullt In Test Error Messages ERROR MESSAGE POSSIBLE CAUSE CIRCUIT LOCATION TACH TEST FAILED 04 on analog board 3 fig 7 5 U7 on analog board 16 fig 7 5 U3 on computer board 9 fig 7 4 U12 on computer board 7 fig 7 4 014 on computer board 11 fig 7 4 VORAMFAILED Ut41 U13oncomputerboard 7 fig 7 4 0 2KRAMFAILED U5oncomputerboard 28 fig7 4 ANALOG CIRCUIT U9 on analog board 52 fig 7 5 FAILED Q1 U1 U3 U4 U5 or U6 3 fig 7 5 on analog board U17 on analog board 60 fig 7 5 5 28 REPAIR 5 29 GENERAL REPAIR PROCEDURES Use a minimum amount of heat when un soldering and resoldering components Resolder compone
38. ERS 11 13 Zo a RPM SELECT 3 mussp L sgps eee BIT PCO 2PCI COMPUTER PCB FREQ TO TIMER LOGIC 1PC IPB U3 UI2 UM DATA BUS FUNCTION SELECT 81 on analog pcb to NORM READING STD DAY READING AIRCRAFT INDICATOR ON TEMP SELECT SW14 to TAMB NORMAL RPM SELECT SW13 lo 1 2 3 denilfic J3 RPM INPUT INSTR CABLE 44 TEMP RPM Figure 4 8 RPM Measuring Circuit Simplified Schematic 4 9 THIS DOCUMENT IS SUBJECT TO THE LEGEND RESTRICTIONS ON THE TITLE PAGE TESTER ANALOG PCB DECK 5101 REF SIG SIG REF ys bt Hone 3 10 Ul R63 CRI 15 SV REF MV Y P104 5104 REG y le ADC oca Lom y 3 R67 Don JUMPER Y PLUG 015 v 28 i Pen S102 P102 5201 P201 2 4 PRESSURE 3 TO PORTS SELECT 10 IPB 3PB COMPUTER PCB Bequirad Switch FUNCTION SELECT 81 on analog pcb to NORM READING STD DAY READING or AIRCRAFT INDICATOR ON TEMP SELECT SW14 to or NORMAL PRESSURE SELECT 5 10 to INTERNAL EXTERNAL or EPR Figure 4 9 Pressure Measuring Circuit Simplified Schematic 4 10 THIS DOCUMENT 15 SUBJECT THE LEGEND RESTRICTIONS ON THE TITLE PAGE POWER INPUT 115 230 28 OR vpt INTERNAL INTERNAL PRINTERX XDI
39. Engrg Compensator CJ K Resistor Howell Operational 8 ohm 0 1 instruments checkout 0 4w BH2435 Hesistor Howell Operational 22 ohm 0 196 Instruments checkout BH2436 Resistor Ultronix Operational 1K 3w 1 C3971 checkout Voltage General Temperature O to 0 002596 Standard Resistance cal internal 10 vde 5uv DAS 45AX voitage cal pressure valtage cal Resistance General Insulation O to 0 01 Decade 2 Resistance cal cold 11 1111 0 010 ohm DA763X junction cal megohm decade Hevised 7 6 89 5 1 NOMENCLATURE PART NUMBER Resistance Decade 1 Frequency Synthesizer Oscilloscope Absolute Pressure Gage Volt Ohm Milliammeter Digital Multimeter Pressure Source THIS DOCUMENT IS SUBJECT TO THE LEGEND RESTRICTIONS ON THE TITLE PAGE Table 5 1 Test Equipment Continued OR MODEL Electro Scientific DB62 Anadex FS 600 Tektronix 432 Wallace amp Tiernan 61A 1B 0100 Triplett 630 NS Fluke 8800A APPLICATION TAMB cal tc res cal RPM chk Trouble shooting Int press transducer cal Operational checkout trouble shooting Operational checkout trouble shooting Pressure cal RANGE O to 11 111 1 ohms 100 mHz to 1199 99 KHz Vert 1mv to 10v div Horiz 0 2us to 5s div O to 100 in Hga O to 60 200mv 20v Depends on xdcr ACCURACY 0 01 0 0005 ohm decade 0 00196 3
40. F 41 269MV RD 32 F 16 Set voltage standard to 41 269 17 Press ENTER Reading will become 1832 F and then display will read 1 2 CAL SEE COMPLETE SERVICE MANUAL 18 Set mode switch to 0 5 4 THIS DOCUMENT IS SUBJECT THE LEGEND RESTRICTIONS ON THE TITLE PAGE 19 Set voltage standard to 20 640 mvdc Temperature display shall read 932 4 F If not perform cold junction calibration of paragraph 5 11 and then repeat steps 1 19 20 This completes the temperature calibration 5 6 External Pressure Transducer Calibration 1 Connect external pressure transducer cable and transducer to EXTERNAL PRES SURE connector if pressure will be the signal source 2 Set mode switch to 7 Display will read NOTE To continue when SEE SERVICE MANUAL appears press ENTER If ENTER ACCESS 1 0 appears use LEFT RIGHT and INCREMENT switches to set access identification to H337N and then press ENTER Display 2 appears only if tester has been turned off since the last time access identification was set 1 2 3 4 SEE ENTER EXTERNAL SELECT SERVICE ACCESS TRANSDUCER ENG TYPE XX MANUAL CALIB where XX is the position of the ENGINE TYPE SELECT switch 3 Turn ENGINE TYPE SELECT switch to desired position 4 Press ENTER Display will read VOLTAGE PRESSURE CALIBRATE where selected calibration source VOLTAGE or PRESSURE will be flashing Select desired calibration sou
41. HH L HL HHHHHHHHHHLHHHHH L LIH IHHHHHHHHHHHL HH L H L L HHHHHHHHHHHHLHHH L LIH H L H H H HH HH HH HH H HH L HH L HL HHHHHHHHHHHHHH LH L LIH H HH H H HH HHHHHHHHHHHL L HIX X X X H H H H A HH AHHH H HAH HHH H LIX X X X H H H H HH HH HH HH HHH H H X X X X H HH AH AHH HH HH HH HH H H high level L low level X irrelevant A 13 10710 DUAL DIGIT NUMERIC DISPLAYS These are orange 14 segment common cathode displays in 2 character packages Characters are 54 high with right hand decimal point 155810 Al Ft let NI jn pi M G2 apo E2 A2 PIN NO 1 2 3 4 5 6 7 8 9 A3 2 84 03 04 G3 1lNG4 C4 E4 4 FUNCTION D No Connection Anode G Anode C Cathode 2 includes D P A Anode D P Display A No Connection Cathode 3 Anode D P Display B Cathode 4 Includes D P B No Anode A No Connection Anode B Cathode 1 No Connection Anode E Anode F 14 o 10712 QUAD SPST CMOS ANALOG SWITCH This device contains four independently selectable SPST switches which feature fast switching speeds 185 ns combined with low power dissipation Each switch provides low ON resistance operation for input signal voltages up to the supply rails and for signal currents up to 80 ma All switches provide break before make switching
42. MENT 15 SUBJECT THE LEGEND RESTRICTIONS ON THE TITLE PAGE SECTION Ill PREPARATION FOR USE AND SHIPMENT 3 1 PREPARATION FOR USE 3 2 UNPACKING There are no special unpacking procedures A list of items shipped is included in Section VIII The tester is ready for use after unpacking Operation instructions are contained in the instrument case lid as well as in Section of this manual 3 3 ENGINE TEST SETUPS Engine test setup diagrams if included are in Section VIII 3 4 LOADING INTERNAL PRINTER PAPER HOWELL PN C10717 MEMODYNE PN PT 20B1 IN PRINTER MAP 20SBCL FIGURE 4 11 SHEET 6 1 Loosen captive screws in PRINTER ACCESS door and lower door 2 Depress both front panel slide latches Figure 3 1 and pull printer mechanism out of housing until mechanism stops THERMAL PAPER ROLL LOAD BRACKET AXLE AXLE SLOT SLIDE LATCH Figure 3 1 Loading Internal Printer Paper 3 Pull remaining paper out from under print head Grasp empty paper roll and pull it straight along axle slot and out of printer assembly 4 Slide paper roll axle out of used paper roll and insert axle into new paper roll Howell pn C10717 DO NOT DISCARD AXLE 5 Raise load bracket 3 1 Change 4 THIS DOCUMENT IS SUBJCT TO THE LEGEND RESTRICTIONS ON THE TITLE PAGE 6 Slide axle with new paper roll into axle slot and seat the axle bottom of slot Be sure paper is fed from rear and passes over paper roll Paper should be cu
43. PAGE Press ENTER Display will read B PRINT DESIGNATOR PAMB PINT or PEXH Use CHANGE button to select the designator of internal pressure that will appear in data printouts If PAMB is selected then NOT SCALED will be displayed when PRESSURE SELECT switch is turned to EPR NOTE Tester will not allow same print designator to be assigned to both internal and external transducers 4 Press ENTER Display will read INTERNAL RANGE 101 80 IN HG 50 00 P S 1 3447 MBAR or NOT SCALED where units or scaling message selected during previous scaling will be flashing 5 Use CHANGE button to select desired caption 6 Press ENTER Display will read 1 2 3 SCALING INTERNAL SELECT COMPLETED TRANSDUCER ENG TYPE XX SCALING Proceed at step 2 to scale the internal transducer for other engine types 5 19 DISPLAYING AND PRINTING STORED CALIBRATION AND SCALING DATA 5 20 Mode 1 allows the operator to display and or print the calibration arid scaling data of all parameters of all engine types No changes can be made in this mode 5 21 DISPLAYING STORED CALIBRATION AND SCALING DATA 1 Set mode switch beneath SCALING AND CALIBRATION access door to 1 Display will read STORED SCALING CALIB 2 Turn ENGINE TYPE SELECT switch to desired position Display will read STORED SCALING CALIB Revised 9 22 88 5 22 THIS DOCUMENT 15 SUBJECT TO THE LEGEND RESTRICTIONS ON THE TITLE PAGE 3
44. Sample Printout of Calibration and Scaling Data 5 26 Dual 14 Segment Display 5 27 Tester Unit Assembly Wiring Schematic BH26572 2 6 3 Wire LISE TOSEBI 22 25 ia 6 5 Analog Printed Circuit Board BH26637 1 Schematic 6 11 Computer Printed Circuit Board BH26575 1 Schematic 6 13 Display Printed Circuit Board BH26573 1 Schematic 6 15 Power Supply Printed Circuit Board BH27171 2 Schematic 6 17 Engine Test Set H337N Series 7 9 Unit Assembly 26630 7 13 Deck Assembly 26571 3 7 19 Computer Circuit Board Assembly BH26575 1 7 27 Figure 7 5 7 6 77 7 8 7 9 740 7 11 2 18 7 13 7 14 7 15 7 16 Table 1 1 2 1 5 2 5 3 LIST OF ILLUSTRATIONS Continued Title Analog Printed Circuit Board Assembly BH26637 1 Display Printed Circuit Board Assembly BH26573 1 Power Supply Circuit Board Assembly BH27171 2 Transducer Bracket Assembly 26617 Circuit Breaker Bracket Assembly BH26616 Power Supply Bracket Assembly BH26618 3 Panel Assembly BH26596 Switch Assembly BH26615 Power Cable BH25000 28 Power Cable BH25000 115 Power Gable BR25000 2 99 a pee red Probe Cable Assem
45. T switch to INTERNAL and remove any error in ambient pressure reading per paragraph 4 21 Then apply a known pressure to the internal transducer Pressure display shall read desired reading 0 25 IN HG 0 12 P S 1 If reading is in tolerance this completes the calibration and scaling of the trans ducer If reading is out of tolerance perform internal transducer voltage calibration of paragraph 5 13 and then repeat applicable steps of this paragraph reading is still out of tolerance replace internal transducer and repeat applicable steps of this paragraph 8 Press ENTER Display will read FULL SCALE EQU 101 80 IN HG or 50 00 P S 1 Bottom line will be flashing Select desired units IN HG or 5 1 with CHANGE button 9 Omitted Revised 4 12 90 5 9 THIS DOCUMENT SUBJECT TO THE LEGEND RESTRICTIONS ON THE TITLE PAGE 10 Press ENTER Display will read VENT TRANSDUCER IN HG or P S and one digit of current reading will be flashing Uncap internal transducer port and set reading to current barometric pressure using LEFT RIGHT and INCREMENT switches 11 Press ENTER Display will read APPLY XX XX IN HG or P S I where one digit of full scale value selected in step 8 will be flashing 12 Apply a full scale pressure near the value of to the transducer and use the LEFT RIGHT and INCREMENT switches to change display until is equal to the applied pressure
46. TER RD will change to 35 00 and then display will read 1 2 CAL SEE COMPLETE SERVICE MANUAL 6 Disconnect resistance decade from tester This completes the calibration of the T C resistance circuit 5 10 INTERNAL CALIBRATION THIS DOCUMENT SUBJECT THE LEGEND RESTRICTIONS ON THE TITLE PAGE 5 11 COLD JUNCTION CALIBRATION 1 Disconnect cables from tester 2 Hemove 12 screws from around edge of tester deck and lift deck assembly from case assembly 3 Remove jumper plug P104 from socket S104 on the analog board figure 5 3 Nu PIN 14 PIN 5104 DETAIL Figure 5 3 Socket 5104 Pin Identification 4 Connect power cable to tester and to power source 5 Turn MASTER POWER switch on Display will read 1 2 COLD CJ 40 F JUNCTION 6 8 186 8K S104 6 8 RD 6 Using resistance decade 2 table 5 1 apply 186 8K ohms to connector S104 pins 6 and 8 7 Press ENTER button under SCALING AND CALIBRATION access door Reading RD will become 40 0 F and display will change to CJ 160 6 8 4 662K RD 40 0 F 5 13 THIS DOCUMENT 15 SUBJECT TO THE LEGEND RESTRICTIONS ON THE TITLE PAGE 8 Set resistance decade to 4 662K ohms 9 Press ENTER Reading will become 160 0 F and then display will read 1 2 INTERNAL PUT 0 00 V TRANSDUCER 130 12 VOLT RD X XXX V 10 Turn MASTER POWER switch off 11 Disconnect resistance decade from tester r
47. UMENT 15 SUBJECT TO THE LEGEND RESTRICTIONS ON THE TITLE PAGE TABLE OF CONTENTS Section INTRODUCTION AND GENERAL INFORMATION 1 1 INVOAUCION TTE 1 1 1 2 rc E 1 1 1 3 PUDO Srila 1 1 1 4 COC LP 1 1 1 5 Atrarigermobl dpud nia ad 1 1 1 6 Abbreviations and nun nenn 1 1 1 7 General Equipment Information occoooccccccanononananinnanoniconcnros 1 3 1 8 PUPRCHONS Of Ted 1 3 1 9 id 1 4 1 10 Physical Description il cias 1 6 SPECIAL TOOLS AND TEST EQUIPMENT 2 1 Special Tools and Test Equipment List 2 1 ll PREPARATION FOR USE AND SHIPMENT 3 1 Preparation tor Usb um 3 1 3 2 Unpacking rm 3 1 3 3 Engine Test SU Sii 3 1 3 4 Loading Internal Printer Paper In Printer MAP 20SBCL 3 1 3 5 Loading Internal Printer Paper in Printer MAP 21CBC 3 2 3 6 Cable for Optional External 1 3 2 3 7 Setting External Printer Baud Rate 3 3 3 8 Preparation for 3 4 IV OPERATION INSTRUCTIONS 4 1 Theory of Operation iii EE 4 1 4 Section IV 4 2 4 3 4 6 4 8 4 9 4 10 4 11 4 12 4 13 4 14 4 15 4 16 4 17 4 18 4 19 4 20 4 21 4 22 4 23 4 24 4 25 4 26 4 2
48. a to output drivers which directly drive the LED dis plays The drivers are active when the control pin labeled SOE is low and the displays blank when this pin goes high To correlate the output data with the proper segments digit outputs D1 D4 directly drive the bases of digit transistors Q1 Q56 4 16 POWER SUPPLY Primary power 115vac or 230vac 50 400 Hz or 28vdc is ap plied to the POWER INPUT connector figure 4 10 AC power is applied to power transformer Ti T1 has two primary windings which are connected in parallel when 115vac power is used and in series when 230vac power is used Appropriate connec tions are made with jumpers in the power cable The secondary winding is full wave rectified to provide 28vdc to drive the power supply board and an optional internal printer The power supply board contains an inverter and a 5 volt regulator circuit Secondary voltages of inverter transformer are rectified to provide 28vdc for pressure transducer excitation and 15vdc for analog reference The regulator provides 5vdc for display excitation and logic 4 6 THIS DOCUMENT IS SUBJECT TO THE LEGEND RESTRICTIONS ON THE TITLE PAGE SY REF COMPUTER PCB 2 2PAJ 2PA v ui _ naim o niin mm TESTER DECK RI zero 7 J 5 15 SPOOL L b EZ En ie den ee mam cue cd died side diede PA demi deum a m HE AA A uum eee FUNCTION SEL
49. able 1 1 Specifications Programmable Accuracy Parameter Range Display Range Note 1 Engine Temperature to 13500 to 1350 2 C type K cr al t c 0 to 2462 F to 2462 F 4 Engine Temperature 0 to 1360 C O to 1360 2 cr al curve 0 to 2480 F to 2480 F 4 Standard Day Temp 60 100 C a 4 ambient 600 C Ambient Temperature 60 to 100 C 60 to100 C 0 3 C 76 to 212 F 76 to 212 F 0 5 Frequency 10 to 30K Hz 30 000 counts max 0 1 96 note 2 RPM RPM PPH HZ Standard Day Freq 60 to 100 C 0 296RPM ambient 70HZ 100 Internal Pressure 0 to 5vdc O to 101 8 0 25 Transducer IN HG ABS IN HG THIS DOCUMENT IS SUBJECT TO THE LEGEND RESTRICTIONS ON THE TITLE PAGE 1 10 PHYSICAL DESCRIPTION The tester is housed in a rugged portable case All cable and hose connections switches controls and displays are located on the deck The H337N Series part number assignment is as follows H337N tester includes printer access without printer H337NP tester includes printer 1 6 THIS DOCUMENT IS SUBJECT TO THE LEGEND RESTRICTIONS ON THE TITLE PAGE Table 2 1 Special Tools and Test Equipment List Continued TOOL EQUIPMENT NOMENCLATURE USE AND APPLICATION General Resistance Resistance Cold junction cal DA763X decade insulation cal Electro Scientific Resistance TAMB cal DB62 decade tc res cal Anadex Frequency RPM accy chk FS 600 synth
50. arget value 9 If internal pressure input has been designated PINT or PEXH per paragraph 5 18 and external pressure input has been designated PAMB per paragraph 5 17 or PAMB has been set as explained in paragraph 4 21 then engine pressure ratio can be read directly by turning PRESSURE SELECT switch to EPR 10 If TAMB probe is connected or TAMB has been set per paragraph 4 22 then cor rected temperature and rpm readings can be displayed by turning FUNCTION SELECT switch to STD DAY READING Units of temperature and rpm will alternate with ST D to remind operator that these are standard day readings 11 Up to 18 snapshots of engine trim data may be stored for future reading and or printing Press STORE button for each snapshot Display reminds operator of snap number since last ID number change Nineteenth press of STORE button overwrites oldest data See paragraph 4 31 for displaying and printing data 12 Turn MASTER POWER switch off before removing cables from tester and aircraft 4 24 THIS DOCUMENT 15 SUBJECT TO THE LEGEND RESTRICTIONS ON THE TITLE PAGE 4 30 TURBOPROP ENGINE TRIM CHECK 1 Connect appropriate engine trim cables and adapters to TEMP RPM and RPM IN PUT INSTR CABLE receptacles on tester 2 Connect TAMB cable to TAMB receptacle on tester and connect TAMB probe to cable 3 Connect torque pressure transducer to engine using appropriate adapters and to tester PRESSURE EXTERNAL receptacle using torque pressur
51. bly BH24950 a 9 s 9 2 4 gt LIST OF TABLES Title Je o 1 2 prc Special Tools and Test Equipment List TESEEQUDMENE ais EA a Display Test Troubleshooting Table Built In Test Error Messages 9 u a X 9 a eo vi THIS DOCUMENT IS SUBJECT TO THE LEGEND RESTRICTIONS ON THE TITLE PAGE SECTION INTRODUCTION AND GENERAL INFORMATION 1 1 INTRODUCTION 1 2 GENERAL This manual contains information pertaining to the H337N Series En gine Test Set manufactured by Howell Instruments Inc Fort Worth Texas The Engine Test Set hereinafter referred to as the test set or the tester is pictured in figure 1 1 Tester parts are illustrated and identified in the Illustrated Parts Breakdown Section VII 1 3 PURPOSE The purpose of this manual is to provide sufficient information for the technician to understand operate calibrate and maintain the tester 1 4 SCOPE in this manual are diagrams and the theory of operation of all tester cir cuitry complete operation instructions showing cabling connections a list of the calibra tion equipment and procedures necessary to maintain the accuracy of the tester and troubleshooting and repair procedures 1 5 ARRANGEMENT This manual is arranged in the following sections Section Title Introduction and General Information Special Tools and T
52. cord engine types selected with ENGINE TYPE SELECT switch ENGINE TYPE SELECT Determines which set of parameter calibration and switch scaling data is used to generate engine parameter readings Figure 4 11 Tester Indicators and Controls Sheet 3 4 14 INDEX NO 22 23 24 THIS DOCUMENT IS SUBJECT TO THE LEGEND RESTRICTIONS ON THE TITLE PAGE INDICATOR OR CONTROL Mode switch CHANGE button ENTER button FUNCTION Switch with highest priority in determining tester functions Switch positions and functions follow O normal Tester functions are determined by FUNCTION SELECT switch second priority and TEMP SELECT switch third priority 1 read and print stored calibration and scaling data 2 engine temperature scaling 3 rom scaling 4 external pressure transducer scaling 5 internal pressure transducer scaling 6 temperature calibration of engine temperature and TAMB probe 7 external pressure transducer calibration 8 internal pressure transducer calibration 9 insulation resistance calibration 10 thermocouple resistance calibration 11 set external printer baud rate May be used to step through tester internal calibration displays 15 used to step through calibration and scaling data in mode 1 In cali bration and scaling modes is used to select temperature parameters temperature calibration curves engineering units calibration input types pressure types scalin
53. ct tester power cable to POWER INPUT receptacle and to appropriate power Source 2 Tum MASTER POWER switch on 3 Set mode switch under SCALING AND CALIBRATION door to 11 Display will read 1 2 SET BAUD BAUD EXTERNAL RATE EQUAL PRINTER XXXX where XXXX the previously set baud rate or default value is flashing 4 Use CHANGE button to select desired baud rate Choices are 110 300 600 1200 1800 2000 2400 and 3600 5 After selecting desired baud rate press ENTER button 25 gt A TO TESTER EXTERNAL PRINTER CONNECTOR TO PRINTER MATES BENDIX PTO2A 12 85 Figure 3 2 External Printer Cable for RS232 Interface 25FT MAX READ TO TESTER Y EXTERNAL CURRENT LOOP TO PRINTER PRINTER CONNECTOR RA MATES BENDIX 2 12 85 Figure 3 3 External Printer Cable for Current Loop Interface 3 3 Change 4 THIS DOCUMENT IS SUBJCT TO THE LEGEND RESTRICTIONS ON THE TITLE PAGE NOTE Current loop is by a 4 8 source through a 56 ohm internal resistor Maximum allowable source current is 25 ma at high logic level Maximum available source current at low logic level is O ma open collector 3 8 PREPARATION FOR SHIPMENT 3 9 The tester should be surrounded with two inches of rubberized hog hair when it is packed for shipment Use the latest revision of specification MIL P 116 method IIB and JAN P 100 Change 4 3 4 THIS DOCU
54. default value is flashing 4 Use CHANGE button to select desired baud rate Choices are 110 300 600 1200 1800 2000 2400 and 3600 5 After selecting desired baud rate press ENTER button 6 25 FT TO TESTER EXTERNAL PRINTER CONNECTOR PRINTER MATES BENDIX PTO2A 12 85 Figure 3 2 External Printer Cable for RS232 Interface k 25 FT MAX TO TESTER READY EXTERNAL CURRENT LOOP PRINTER CONNECTOR BRENTLOOP TO PRINTER MATES BENDIX 2 12 88 Figure 3 3 External Printer Cable for Current Loop Interface 3 3 Change 4 THIS DOCUMENT IS SUBJCT TO THE LEGEND RESTRICTIONS ON THE TITLE PAGE NOTE Current loop is driven by a 4 8 source through a 56 ohm internal resistor Maximum allowable source current is 25 ma at high logic level Maximum available source current at low logic level is O ma open collector 3 8 PREPARATION FOR SHIPMENT 3 9 The tester should be surrounded with two inches of rubberized hog hair when it is packed for shipment Use the latest revision of specification MIL P 116 method IIB and JAN P 100 Change 4 3 4 THIS DOCUMENT IS SUBJECT TO THE LEGEND RESTRICTIONS ON THE TITLE PAGE SECTION IV OPERATION INSTRUCTIONS 4 1 THEORY OF OPERATION 4 2 GENERAL This section contains a brief discussion of the tester theory of opera tion as well as operation instructions Included are a computer system block diagram simplif
55. e cable 4 Turn ENGINE TYPE SELECT switch to desired position NOTE Do not do step 5 if a voltage ratio type torque transducer is being used Should the button be inadvertently pressed it will be necessary to rescale the external transducer for the selected engine type per instructions in Section 5 Turn PRESSURE SELECT switch to EXTERNAL and depress SET TO ZERO button to zero torque transducer reading 6 Set identification and trim target numbers per paragraph 4 20 7 Turn FUNCTION SELECT switch to NORM READING TEMP SELECT switch to NORMAL and RPM SELECT switch to desired position NOTE Monitor for hot start 8 Start engine and trim to target value 9 If TAMB probe is connected or TAMB has been set per paragraph 4 22 then cor rected temperature and rpm readings can be displayed by turning FUNCTION SELECT switch to STD DAY READING Units of temperature and rpm will alternate with ST D to remind operator that these are standard day readings 10 Up to 18 snapshots of engine trim data may be stored for future displaying and or printing Press STORE button for each snapshot Display reminds operator of snap number since last ID number change Nineteenth press of STORE button overwrites oldest data See paragraph 4 31 for displaying and printing of data 11 Turn MASTER POWER switch off before removing cables from tester and aircraft 4 31 DISPLAYING AND PRINTING DATA Stored data may be manually displayed
56. e signal input pins at the aircraft to sub tract the tester and test cable resistance from the tester readings Thermocouple effects are canceled as explained in paragraph 4 9 4 11 AIRCRAFT INSTRUMENT RESISTANCE SET CIRCUIT When the aircraft in strument resistance is set prior to making the D Arsonval temperature indicator test the test cable leads are jumpered at the indicator figure 4 6 The constant current genera ted by the 5 vdc supply and the circuitry of U1 and Q1 in the analog board flows _ through the AIRCRAFT INSTRUMENT RESISTANCE control and the wiring of the tester and test cable to ground The generated voltage is amplified by U9 and applied to ADC U17 is adjusted until the tester displays the resistance value specified on the aircraft indicator Thermocouple effects are canceled as explained in paragraph 4 9 4 5 THIS DOCUMENT 15 SUBJECT TO THE LEGEND RESTRICTIONS ON THE TITLE PAGE 4 12 AIRCRAFT INDICATOR CHECK CIRCUIT A negative voltage from the CRAFT INSTRUMENT TEMP control figure 4 7 is applied to the inverting input of amp lifier U1 resulting in a positive test voltage This voltage is applied through the AIR CRAFT INSTRUMENT RESISTANCE control to the aircraft indicator and simultaneously to amplifier U9 on the analog board for measurement 4 13 RPM MEASURING CIRCUIT Up to three rpm input signals N1 N2 and are applied to three isolation transformers T1 T3 on the analog board f
57. econnect jumper plug P104 and rein stall deck assembly in case 5 12 External Transducer Voltage Calibration 1 Perform steps 1 5 of paragraph 5 11 2 Use CHANGE button under SCALING AND CALIBRATION access door to step to the following displays 1 2 EXTERNAL PUT 0 00 V TRANSDUCER 46 B VOLT CALIB RD X XXX V 3 Connect voltage standard table 5 1 to pins B and C of EXTERNAL PRES SURE connector 4 Set voltage standard to 0 000 o Press ENTER Reading will become 0 000 V and then display will read PUT 6 00 V J6C B RD 0 000 V 6 Set voltage standard to 6 000 vdc 7 Press ENTER Reading will become 6 000 V and then display will read 1 2 RATIO PUT 0 00V VOLTS 46 F VOLT CALIB RD X XXX V 8 Set voltage standard to 0 000 vdc 9 Press ENTER Reading will become 0 000 V and then display will read PUT 6 00 V _ 46 F RD X XXX V 5 14 THIS DOCUMENT IS SUBJECT TO THE LEGEND RESTRICTIONS ON THE TITLE PAGE 10 Set voltage standard to 6 000 vdc 11 Press ENTER Reading will become 6 000 V and then display will read 1 2 COLD CJ 40 F JUNCTION 6 8 186 8K S104 6 8 J RD XXX X F This completes the external transducer voltage calibration 12 Turn MASTER POWER switch off 13 Disconnect voltage standard from tester reconnect jumper plug P104 and reinstall deck assembly in case 5 13 Internal Transducer Voltage Calibration
58. esizer Tektronix Oscilloscope Troubleshooting 432 Wallace amp Tiernan Absolute Int press xdcr cal 61A 1B 0100 pressure Triplett Volt ohm Operational checkout 630 NS milliammeter Fluke Digital Operational checkout 8800A multimeter Pressure source Pressure cal 2 2 i ER THIS DOCUMENT 15 SUBJECT TO THE LEGEND RESTRICTIONS ON THE TITLE PAGE SECTION Ill PREPARATION FOR USE AND SHIPMENT 3 1 PREPARATION FOR USE 3 2 UNPACKING There no special unpacking procedures list of items shipped is included in Section VIII The tester is ready for use after unpacking Operation instructions are contained the instrument case lid as well as in Section of this manual 3 3 ENGINE TEST SETUPS Engine test setup diagrams if included are in Section VIII 3 4 LOADING INTERNAL PRINTER PAPER HOWELL PN C10717 MEMODYNE PN PT 20B1 IN PRINTER MAP 20SBCL FIGURE 4 11 SHEET 6 1 Loosen captive screws in PRINTER ACCESS door and lower door 2 Depress both front panel slide latches Figure 3 1 and pull printer mechanism out of housing until mechanism stops THERMAL PAPER ROLL AXLE SLOT SLIDE LATCH Figure 3 1 Loading Internal Printer Paper 3 Pull remaining paper out from under print head Grasp empty paper roll and pull it straight along axle slot and out of printer assembly 4 Slide paper roll axle out of used paper roll and insert axle into new paper roll Howe
59. ess PRINT button again Printout will cease and indicate point of termination by PRINT TERMINATED Figure 4 12 on the following page is a sample printout 4 26 THIS DOCUMENT SUBJECT TO THE LEGEND RESTRICTIONS ON THE TITLE PAGE STORED DATA ENGINE TYPE 3 ID 241086 300 001 TRIM TGT 2 010 EPR PINT 29 38 IN HG PINT PAMB 0 999 PEXT 17 18 P S I TEMP 1360 DEG C 1 0 0 PCNT N2 0 R P M N3 0 43 1 DEG C PAMB 29 40 IN HG STANDARD DAY READINGS TEMP 1215 DEG C N1 0 0 PCNT N2 0 R P M N3 0 PRINTOUT FINISHED Figure 4 12 Sample Printout of Stored Data 4 27 THIS DOCUMENT IS SUBJECT TO THE LEGEND RESTRICTIONS ON THE TITLE PAGE SECTION V MAINTENANCE INSTRUCTIONS 5 1 GENERAL 5 2 An annual accuracy check should be performed to ensure that test set is operating within the accuracy tolerances listed This check should also be performed following replacement of any electronic components associated with the measurement Circultry Calibration of any function that is out of tolerance is required to return the test set to specification Follow calibration procedures in the order listed Hecommended test equipment is listed in table 5 1 Equivalent equipment will suffice NOMENCLATURE PART NUMBER Table 5 1 Test Equipment APPLICATION RANGE ACCURACY OH MODEL Ice Bath Howell Temperature 0 25 C Junction Instruments cal BH14106 or Cold Junction Omega
60. est Equipment Preparation for Use Shipment IV Operation Instructions V Maintenance Instructions Diagrams illustrated Parts Breakdown Vil Application Data Appendix A Descriptions of Integrated Circuits Appendix B Acceptance Test Procedure 1 6 ABBREVIATIONS AND SYMBOLS Abbreviations and symbols used in this manual are explained in the following list Abbreviation Symbo Meaning BIT built in test CAL calibration CALIB calibrated or calibration CALIBR calibrated CJ cold junction CK check 1 1 Change 2 vedo a PC d 444 Den ERA ye 4 z ne THIS DOCUMENT 15 SUBJECT TO THE LEGEND RESTRICTIONS ON THE TITLE PAGE Test aircraft temperature indicator lest resistance of aircraft temperature circuit Test insulation of aircraft temperature circuit Verify accuracy of aircraft rpm system accuracy of aircraft temperature indicating system Monitor temperature during engine trimming Monitor rpm during engine trimming Monitor pressure during engine trimming Compute epr Measure engine torque Automatically correct temperature and rpm to standard day conditions 12 13 Store and display or print up to 18 input data records snapshots Store and display or print calibration and scaling data for up to 10 engine types 1 9 SPECIFICATIONS Specifications are listed in table 1 1 T
61. formation for that digit is presented to the output In this manner 16 segment al phanumeric displays 24 or 32 segment displays or an array of discreet LED s can be controlled by the simple cascading of expandable segment display controllers All in puts except digit inputs are TTL compatible and do not clamp input voltages above Vcc The digit outputs directly drive the base of a grounded emitter digit transistor without the need of a Darlington configuration If a controller is driving a digit transistor and also supplying digit information to a cascaded controller base resistors are needed in the digit een to provide an adequate high level to the digit inputs of the cascaded controller These display controllers contain four 8 bit registers any one may be randomly written into In normal operation the internal multiplexer scans the registers and refreshes the display In cascaded operation one controller serves as a master refresh device and cascaded controllers are slaved to it through digit lines operating as inputs The controller appears to a microprocessor as memory and to the user as a self scan display Since every segment is under microprocessor control great versatility is ob tained Low power standby operation occurs with both SOE and DIO inputs high A 11 10708 Connection Diagram Truth Tables Dual In Line Package Input Control DIGIT ur WE OPERATION Write digit 1 Latch digit 1 Write digit
62. g on D Arsonval adapter or clip it to chromel pin on input side of null balance adapter 3 Turn FUNCTION SELECT switch to INSULATION Adjust tester ZERO control for a zero reading Remove both leads of aircraft harness from temperature indicator Disconnect clip lead from brass lug and connect it to aircraft ground Insulation resistance displayed on tester should be within technical manual tolerance Turn the MASTER POWER switch off and disconnect adapter leads from the aircraft 4 5 i Connect brass lug to one lead of aircraft harness 8 9 harness 4 23 THIS DOCUMENT IS SUBJECT TO THE LEGEND RESTRICTIONS ON THE TITLE PAGE 4 28 ENGINE TRIM CHECK OPERATION CAUTION To prevent damage to internal transducer use to measure dry pressures only 4 29 TURBOJET ENGINE TRIM CHECK 1 Connect appropriate engine trim cables and adapters to TEMP RPM and RPM IN PUT INSTR CABLE receptacles on tester 2 Connect the TAMB cable to TAMB receptacle on tester and connect TAMB probe to cable 3 Connect the pressure hose to PRESSURE INTERNAL port and to appropriate engine fitting 4 Turn ENGINE TYPE SELECT switch to required position 5 Turn PRESSURE SELECT switch to INTERNAL 6 Set identification number and trim target per paragraph 4 20 7 FUNCTION SELECT switch to NORM READING TEMP SELECT switch to NORMAL and RPM SELECT switch to desired position NOTE 8 Start engine and trim to t
63. g types and to answer yes no questions Causes the storing of selections made with the CHANGE button and of settings made with LEFT RIGHT and INCREMENT switches Figure 4 11 Tester Indicators and Controls Sheet 4 4 15 INDEX NO 25 26 27 THIS DOCUMENT 15 SUBJECT TO THE LEGEND RESTRICTIONS ON THE TITLE PAGE INDICATOR OR CONTROL LEFT RIGHT switch INCREMENT switch FUNCTION SELECT switch FUNCTION Selects digit character to be incremented with INCREMENT switch Steps display through stored data Adjusts calibration and scaling values when in calibration and scaling modes Adjusts identifica tion number setting trim target setting PAMB setting and TAMB setting when in normal mode When tester is in normal mode mode 0 switch has absolute control of tester function in the fol lowing positions INSULATION tester displays aircraft thermocouple harness insulation resistance T C RESISTANCE tester displays aircraft thermo couple circuit resistance INDICATOR CHK tester displays setting of AIRCRAFT INSTRUMENT TEMP adjust SET tester displays setting of AIRCRAFT INSTRU MENT RESISTANCE adjust BUILT IN TEST one position tests display and CPU hardware includes RAM rpm circuit and A D converter Other position tests printer IDENT NO SET tester displays current identification number setting and allows operator to change setting Then it displays current trim target setting and al
64. here XX is the current position of the ENGINE TYPE SELECT switch is the full scale pressure stored during calibration and YYYY units is the default or previously stored display value and units Units will be flashing 15 Use CHANGE button to select desired display units IN HG or PONT NOTE If print designator was selected in step 3 for external pressure then tester will only allow operator to select IN HG P S l or MBAR In this step 16 Press ENTER One digit of display value will begin to flash 17 Set display value using LEFT RIGHT and INCREMENT switches NOTE lf display units are IN HG MBAR or 51 proceed at step 21 and observe that calibration value becomes equal to display value after ENTER is pressed 18 Press ENTER Scaling units XXXX units will begin to flash Use CHANGE button to select desired scaling units IN HG or P S 1 19 Press ENTER One digit of scaling value will begin to flash 20 Set scaling value using LEFT RIGHT and INCREMENT switches 21 Press ENTER Display will read 1 2 3 SCALING EXTERNAL SELECT i COMPLETED TRANSDUCER ENG TYPE XX SCALING Proceed at step 2 to scale additional external pressure transducers used with other en gine types Revised 9 22 88 5 20 THIS DOCUMENT IS SUBJECT TO THE LEGEND RESTRICTIONS ON THE TITLE PAGE 22 Press ENTER Display will read YES NO SAME CAL AS ANOTHER If desired ex
65. ied schematics of the signal measuring circuits and a power flow block diagram Detailed descriptions of integrated circuits are included in Appendix A Most circuitry 15 located on four printed circuit boards namely the computer board the analog board the display board and the power supply board 4 3 COMPUTER SYSTEM The tester is a combination digital voltmeter millivolt source and constant current source which is microprocessor controlled Tester func tions are managed by the central processing unit CPU U6 figure 4 1 and the stored program in the read only memory U1 U2 U6 is an 8 bit microprocessor which has the capability of addressing 65K bytes of memory with its 16 bit address lines The 8 bit data bus is bi directional as well as three state A 5 MHz clock oscillator provides the necessary timing This clock is divided by 2 by CPU 06 and is further divided by counter port ram U11 to provide the built in test BIT frequencies for the frequency measuring circuits 4 4 Switches in the deck switch matrix figure 4 1 and jumper plug P104 determine which subroutines are run by the microprocessor When P104 is removed the tester goes into the internal calibration routine The matrix switch having the highest priority for determining microprocessor action is the mode switch figure 4 11 index 22 under the SCALING AND CALIBRATION access door Switches with lesser priority in the order most to least are the FUNCTION SELECT switch and
66. igure 4 8 The outputs of the trarisformers are diode clamped and applied to analog switch U4 which multiplexes the signals to amplifier 07 The output of U7 clocks dual D flip flop U3 in the timer logic which consists of U3 NAND gate U14 port B bits of U12 and the timers in U12 RPM SELECT switch SW13 determines which signal is displayed 4 14 PRESSURE MEASURING CIRCUIT Twenty eight from the power supply excites the internal and external pressure transducers figure 4 9 The external pres sure or ratiometric input is applied through RC filter components to analog switch 06 06 multiplexes the signal to amplifier U10 The internal pressure transducer signal is ap plied through jumper plug P104 to one of the analog inputs of ADC U17 PRESSURE SELECT switch SW10 determines which pressure parameter 15 displayed 4 15 DISPLAY CIRCUIT The display board figure 4 1 presents 28 digits in 14 dual 14 segment light emitting diode LED displays 11 114 Eight digits are in the top row and 10 digits each are in the other two rows Each dual display is driven by a display driver which can control individual segments and has its own memory Eight bits of seg ment data at a time are presented on the data bus to the enabled display driver enabled by 16 line decoder U15 and written into appropriate memory addressed by address lines AD and 1 After display data is updated internal oscillators in the display drivers sequentially present the dat
67. instruction and keeps it self in the low power mode Normal operation resumes when PS is returned high OUTPUT SIGNALS Bus Acknowledge BACK Active low BACK indicates to the bus requesting device that the CPU bus its control signals are in the TRI STATE mode The requesting device may then take control of the bus and its contro signals Address Bits 8 15 8 15 Active high These are the most significant 8 bits of the memory address bus or of the input output address a BREQ BACK cycle the A 8 15 bus is in the TRI STATE mode Reset Out RESET OUT Active high When RESET OUT is high it indicates the CPU is being reset The signal is normally used to reset the peripheral devices Input Output Memory IO M An active high on the IO M output signifies that the current machine cycle is relative to an input output device An active low on the IO M output signifies that the current machine cycle is relative to memory It is TRI STATE during BREQ BACK cycles Refresh RFSH Active low The refresh output indicates that the dynamic RAM refresh cycle is in progress RFSH goes low dur ng T3 and T4 states of all M1 cycles Address Latch Enable ALE ALE is active only during the T1 state of M cycles and T3 state of M1 cycles The high to low transition of ALE indicates that a valid O refresh address is available on the AD 0 7 lines Read Strobe RD Active low On the trailing edge of the RD
68. ion is corrected A3 Fifer gal F3les IN 82 N 184 1 p3M pa ci 1 Ve 63 c4 C2 ca E2 ES 2 O 4 DPB Figure 5 5 Dual 14 Segment Display 5 27 THIS DOCUMENT 15 SUBJECT TO THE LEGEND RESTRICTIONS ON THE TITLE PAGE Table 5 2 Display Test Troubleshooting Table TROUBLE PROBABLE CAUSE segments display fig 5 5 do not light All 2 segments of display fig 5 5 do not light All segments of a display fig 5 5 do not light All 4 segments of a display fig 5 5 do not light A display does not light All common lettered seg ments i e A segments B segments etc of a display do not light All digits display abnormal test pattern Applicable display driver U1 U14 driver transistor Q1 Q5 09 etc or display 11 114 on display board 26 fig 7 3 Applicable display driver U1 U14 driver transistor Q2 Q6 Q10 etc or display 11 114 on display board 26 fig 7 3 Applicable display driver 01 014 driver transistor Q3 Q7 Q11 etc or display 11 114 on display board 26 fig 7 3 Applicable display driver U1 U14 driver transistor Q4 Q8 Q12 etc or display 11 114 on display board 26 fig 7 3 Decoder U15 on display board 19 fig 7 6 Applicable display driver U1 U14 6 fig 7 6 resistor network RN1 RN14 1 or display 11 114 4 o
69. lay will read SELECT R P M HZ P P H and selected engineering units will be flashing Select desired units with CHANGE but ton 5 Press ENTER Display will read SELECT FULL SCALE XXXXX XX HZ where XXXXX XX equals previous full scale setting Full scale range is 40 00 to 30 000 Hz Set full scale value using LEFT RIGHT and INCREMENT switches 6 Press ENTER Display will read XXXX HZ EQUAL YYYY units where XXXX is full scale value set in step 5 and units are those selected in step 4 NOTE If units selected in step 4 were Hz then YYYY will equal XXXX in the above display If selected units are other than Hz then set full scale units value end LEFT RIGHT and INCREMENT switches 5 17 THIS DOCUMENT 15 SUBJECT TO THE LEGEND RESTRICTIONS ON THE TITLE PAGE 7 Press ENTER Display will read 1 2 3 SCALING RPM SELECT COMPLETED SCALING ENG TYPE XX N1 N2 N3 Repeat steps 2 through 7 for other parameters and other engine types 5 17 EXTERNAL PRESSURE TRANSDUCER SCALING External pressure trans ducer scalina allows the operator to scale external pressure readings FT LB IN HG PONT P S l or MBAR 1 Turn mode switch to 4 Display will read 1 2 EXTERNAL 2 SELECT TRANSDUCER ENG TYPE XX SCALING where XX 15 the position of the ENGINE TYPE SELECT switch 2 Turn ENGINE TYPE SELECT switch to desired position 3 Press ENTER Display will read PRINT DESIGNATOR
70. lay will read TAMB READING IN C F and selected units C or F will be flashing Select desired units with CHANGE button 4 Press ENTER Display will read T C READING IN C F and selected units C or F will be flashing Select desired units with CHANGE button 9 Press ENTER Display will read T C CAL CURVE CR AL TF30 and selected calibration curve CR AL or TF30 will be flashing Select desired curve with CHANGE button 6 Press ENTER Display will read STANDARD DAY PRINT YES OR NO At this point decide if standard day readings are desired in data printouts Select desired answer with CHANGE button 7 Press ENTER Display will read 1 2 3 SCALING TEMP SELECT COMPLETED SCALING ENG TYPE XX 5 16 Nur THIS DOCUMENT 15 SUBJECT TO THE LEGEND RESTRICTIONS ON THE TITLE PAGE 8 Repeat steps 2 through 7 for other engine types 5 16 RPM SCALING For up to three parameters N1 N2 and N3 on each engine type the operator may set full scale in Hz and select the desired engineering units PCNT R P M HZ OR P P H 1 Turn mode switch to 3 Display will read 1 2 RPM SELECT SCALING ENG TYPE XX N1 N2 where the position of the ENGINE TYPE SELECT switch is flashing as well as N2 or N3 the position of ihe RPM SELECT switch 2 Turn ENGINE TYPE SELECT switch to desired position 3 Turn RPM SELECT switch to desired position 4 Press ENTER Disp
71. ll pn C10717 DO NOT DISCARD AXLE 5 Raise load bracket 3 1 Change 4 THIS DOCUMENT 15 SUBJCT TO THE LEGEND RESTRICTIONS ON THE TITLE PAGE 6 Slide axle with new paper roll into axle slot and seat the axle in bottom of slot Be sure paper is fed from rear and passes over paper roll Paper should be cut straight for easy insertion Only outside paper surface is treated for printing 7 Insert paper in slot formed by paper guide and print head until paper appears at front panel opening Pull paper through front panel slot close load bracket by pressing it downwards and check that when power is on EOP LED turns off If not paper is not in proper paper path DTH light should be on when power is on 8 Slide printer mechanism back into housing until both slide latches latch Advance paper by momentarily setting switch to FEED Place switch in center position for normal operation 3 5 LOADING INTERNAL PRINTER PAPER HOWELL PN C15055 MFE INSTRUMENT CORP PN PT21B1 IN PRINTER MAP 21CBC FIGURE 4 11 SHEET 6 1 Loosen captive screws in PRINTER ACCESS door and lower door 2 Rotate the paper advance knob figure 4 11 downward to advance any remaining paper out of the printer Lift up on the head release lever to raise the print head from the roller 3 Lift up on both slide latches to release the slide assembly and pull the slide out of the housing until it stops Lift the spent paper roll and axle from the notches in the slide
72. ll inputs of a single gate go to the 1 logic level the output will go to the O level f one or more inputs go to the O level the output will go to the 1 level By definition Y AB Circuit operation is summarized in the truth table Vcc 4B 4A 4Y 3B 3Y IA Y 2A 2B 2Y GND Truth Table A 19 11270 12 ANALOG TO DIGITAL CONVERTER This is a medium speed 4 channel 12 bit CMOS A D converter which uses the succes sive approximation technique to provide a conversion time of 100 us per channel An auto zero cycle occurs at the start of each conversion resulting in very low system of fset voltages typically less than 100 uv The device uses standard microprocessor in terface control signals CS decoded device address READ and WHITE The 4 channel input multiplexer is controlled via address inputs AO and A1 Conversion results are available in two bytes 8 LSB s and 4 MSB s over an 8 bit three state output bus Either byte can be read first Two converter busy flags are available to facilitate polling of the converter s status The analog input voltage range is to 5V when using a reference voltage of 5V Following is a functional diagram CAZ VDD Vss Vec AIN o 2 AD7582 AIN 1 AIN 2 4 AIN 3 AUTOZERO COMPARATOR AGND THREE STATE OUTPUT CLK DRIVERS RD CS WR BYSL DGND A 20 11310 DUAL 2 LINE TO 4 DECODERS DEMULTIPLEXERS This circuit is desig
73. lows operator to change setting PAMB SET tester displays current PAMB setting and allows operator to change setting TAMB SET OR PROBE tester displays current TAMB reading if probe is connected or allows operator to set TAMB value if probe is not connected Figure 4 11 Tester indicators and Controls Sheet 5 4 16 THIS DOCUMENT IS SUBJECT TO THE LEGEND RESTRICTIONS ON THE TITLE PAGE INDEX NO INDICATOR OR CONTROL FUNCTION When TEMP SELECT switch is to NORMAL tester functions corresponding to other FUNCTION SELECT positions are as follows STD DAY READING tester displays selected pressure and standard day corrected values of engine temperature and selected rpm NORM READING Tester displays selected pressure and uncorrected values of engine temperature and selected rpm AIRCRAFT INDICATOR ON Engine tempera ture harness signal is applied to aircraft indica tor Tester displays selected pressure and uncorrected value of selected rpm Tempera ture display reads A C IND PRINTER MAP 20SBCL 28 Printer slide latch 29 EOP lamp or PAPER lamp PRINTER 21 Holds printer assembly in case When lit indicates printer is out of paper or paper is not in proper path Printer is disabled when lamp is lit PAPER lamp flashes when printer has paper but head release lever is in released position Figure 4 11 Tester Indicators and Controls Sheet 6 4 17 Change4
74. ms 4 Press ENTER RD will change to 0 K and then display will read PUT 200 K J4 A TOB RD 0 0 K 5 Set resistance to 200K 6 Press ENTER RD will change to 200 and then display will read 1 2 CAL SEE COMPLETE SERVICE MANUAL 5 11 Revised 4 12 90 THIS DOCUMENT IS SUBJECT TO THE LEGEND RESTRICTIONS ON THE TITLE PAGE 7 Disconnect resistance decade from tester This completes the calibration of the in sulation resistance circuit 5 9 T C Resistance Calibration 1 Set mode switch to 10 Display will read NOTE To continue when SEE SERVICE MANUAL appears press ENTER If ENTER ACCESS I D appears use LEFT RIGHT and INCREMENT switches to set access identification to H337N and then press ENTER Display 2 appears only if tester has been turned off since the last time access identification was set 1 2 3 4 SEE ENTER CAL PUT IN SERVICE ACCESS T C T C RESIS MANUAL RESISTANCE POSITION Display 4 appears only if the FUNCTION SELECT switch is not in T C RESISTANCE position 2 Turn FUNCTION SELECT switch to T C RESISTANCE Display will read PUT O OHM J4BTOG NOTE J4 is TEMP RPM connector RD XXXX 3 Connect resistance decade 1 table 5 1 to pins B and G of TEMP RPM connector and set resistance to 0 ohms 4 Press ENTER RD will change to 00 00 and then display will read PUT 35 0HM J4 B TO G RD 00 00 5 Set resistance to 35 00 ohms and press EN
75. n display board Octal buffer 010 37 fig 7 4 on computer board 5 28 REMEDY Replace defective component E Um GM GE V UD uh PRO MA De S ED ES De d A am DA AA AR mm WR UD AR GS b Uv Ge VAN Gm Replace defective component dA SR UR A as we w9 65 UM AO ED we we wp US MR um dew V D AAA uum UD D US UR 0 8 DU um ame Qu du amb A AAA d s dem ev Ws S Ap m Am Replace defective component ss d UM jm 6 ds Um 47 BA d am UD JA A m 4 C am Replace defective component ss A AAA AAA 44 wb mp de AR e C GO GN xw AAA Am Um PM GE WP wm Replace defective component ae
76. ned to be used high performance memory decoding or data rout ing applications requiring very short propagation delay times The device is comprised of two individual two line to four line decoders in a single package The active low enable input can be used as data line in demultiplexing applications Following is a logic diagram and a function table ENABLE 16 SELECT INPUTS DATA OUTPUTS SELECT INPUTS FUNCTION TABLE INPUTS ENABLE SELECT OUTPUTS G Yowv v2 H H X L H L H A 21 22 blank
77. nts using 60 40 tin lead ros in core solder with a maximum diameter of 1 16 inch Isopropyl alcohol may be used to remove excess flux 5 30 OPENING AND CLOSING TESTER ASSEMBLY 1 Disconnect cables from tester 2 Remove screws 2 figure 7 2 around edge of tester deck and lift deck assembly from case 3 When closing tester assembly inspect deck gasket 26 27 figure 7 2 for breaks and deterioration and replace if necessary to ensure a watertight seal When replacing deck gasket apply 847 Rubber and Gasket Adhesive manufactured by 3M Company St Paul Minnesota or an equivalent to the underneath side of the gasket to hold it in place and for sealing Inspect bead of sealant around the flange of the case for breaks or voids and geplace as necessary with RTV 3140 Adhesive Sealant manufactured by Dow Corning corporation Midland Michigan an equivalent for a watertight seal 5 29 THIS DOCUMENT IS SUBJECT TO THE LEGEND RESTRICTIONS ON THE TITLE PAGE 5 31 REPLACEMENT OF INTERNAL PRESSURE TRANSDUCER 1 Open tester assembly per paragraph 5 30 to gain access to the transducer bracket assembly 2 figure 7 3 2 Disconnect connector 510 from transducer Remove two screws 2 figure 7 8 holding transducer and clamps to bracket Remove hose and clamps from transducer 1 Install clamps on new transducer Attach hose to transducer Attach clamps to transducer bracket
78. or automatically printed beginning with most recent data The order in which snapshot data is displayed and printed is as follows Engine type number ID number and snap number 4 25 THIS DOCUMENT IS SUBJECT TO THE LEGEND RESTRICTIONS ON THE TITLE PAGE Trim target Internal pressure transducer reading Engine pressure ratio External pressure transducer reading Engine temperature uncorrected Engine rpm s uncorrected Ambient temperature setting or reading Ambient pressure setting if a transducer is not designated PAMB Engine standard day temperature if requested per para graph 5 15 Engine standard day rpm s if requested Only active inputs are displayed and printed 4 32 DISPLAYING DATA 1 Press PRINT button Display will read STORED DATA 2 slowly display all data beginning with the newest data repeatedly press LEFT RIGHT switch to either LEFT or RIGHT position to display each parameter To advance quickly to data of interest hold INCREMENT switch in up position until data of interest is displayed 3 After stored data of interest has been displayed leave manual display mode by pres sing PRINT button 4 33 PRINTING DATA 1 Open printer door 2 Press PRINT button Display will read STORED DATA 3 Press PRINT button again Printer proceeds to print snapshots beginning with the newest data and tester displays data as it is being printed 4 After data of interest has been printed pr
79. r engine types If it doesn t read desired pressure 0 2 make the external pressure test setup of figure 5 2 NOTE Check that excitation voltage across the 1K resistor in the test setup is from 24 to 32 vdc EXTERNAL PRESSURE TESTER Figure 5 2 External Pressure Test Setup 19 Apply transducer span voltage to tester Pressure display shall read desired pres sure 0 1 If it does replace external pressure transducer and repeat this paragraph 5 7 THIS DOCUMENT IS SUBJECT TO THE LEGEND RESTRICTIONS ON THE TITLE PAGE If it doesn t perform external transducer voltage calibration of paragraph 5 12 and then repeat this paragraph 20 Press ENTER Display will read VENT TRANSDUCER PUSH ENTER Vent transducer port to atmospheric pressure 21 Press ENTER Display will read APPLY IN HG or P S I where one digit of full scale value XX XX set in step 11 will be flashing 22 Apply a full scale pressure near the value of XX XX to the transducer and use LEFT RIGHT and INCREMENT switches to change display until it is equal to applied pressure 23 Press ENTER Display will read 1 2 3 4 READING CAL SEE EQUALS NOW COMPLETE SERVICE VOLTS XX XX IN HG or P S 1 MANUAL where 1 is the newiy calculated span value and 2 is the current external pressure transducer reading Span value of display 1 should equal cal pressure low cal pressure full
80. rce with CHANGE button Proceed at step 5 if VOLTAGE was selected and at step 10 if PRESSURE was selected 5 Press ENTER Display will read SPAN EQUALS XXXX XX IN HG or P S I Selected engineering units IN HG or P S I will be flashing Select desired units with CHANGE button 6 Press ENTER One digit of span value will begin to flash Set span value using LEFT RIGHT and INCREMENT switches 5 5 THIS DOCUMENT 15 SUBJECT THE LEGEND RESTRICTIONS ON THE TITLE PAGE 7 Press ENTER Display will read SPAN EQUALS X XXX VOLTS and one digit of span voltage will be flashing Set span voltage taken from calibration sheet using LEFT RIGHT and INCREMENT switches 8 Press ENTER Display will read 1 2 3 SET PAMB TO SEE OR ZERO IN COMPLETE SERVICE MODE 0 CALIBR MANUAL 9 Scale transducer per paragraph 5 17 10 Press ENTER Display will read FULL SCALE EQU IN HG or P S 1 Selected engineering units IN HG or P S I will be flashing Select desired units with CHANGE button 11 Press ENTER Display wiil read FULL SCALE EQU IN HG or 51 and one digit of full scale value will be flashing Set full scale value using LEFT RIGHT and INCREMENT switches 12 Press ENTER Display will read SELECT ABSOLUTE GAUGE DIFF and selected pressure type ABSOLUTE or GAUGE DIFF will be flashing Select de sired pressure type If ABSOLUTE is selected
81. resistance Rx of the aircraft engine temperature circuit This cur rent generates a voltage at the input of buffer amplifier U2 on the analog board The voltage is divided by resistors R14 and R15 before being applied to amplifier U9 tester ZERO control adjusts the display to zero by adjusting the offset of 09 when Rx is jumpered Thermocouple effects are canceled by measuring the circuit output with the current source turned off and subtracting this value from the output with the current source turned on Switch Q1 turns the current source on and off SY REF COMPUTER _ RI tO 2 2 2PAG 2PAS 82 0 iu Ju ANALOG R EXT RX DECK Bequired Switch Positions FUNCTION SELECT 51 on analog pcb to INSULATION y TEMP SELECT SW14 to TAMB or NORMAL dq 4 AE lu M orc a a eee ea es HARNESS CNO J4 TEMP RPM Figure 4 4 Insulation Resistance Measuring Circuit Simplified Schematic 4 10 ENGINE TC RESISTANCE MEASURING CIRCUIT A constant current gener ated by the 5 vdc supply and the circuitry of U1and Q1 figure 4 5 flows through the resistance spool and thermocouple wiring of the aircraft thermocouple circuit The volt age thus generated is amplified by amplifier US on the analog board and applied to ADC U17 As in the insulation resistance measuring circuit the tester ZERO control adjusts the offset of U9 This is done while jumpering th
82. scale pressure x 5 000 volts 0 2 24 Perform steps 17 through 19 as required 5 7 INTERNAL PRESSURE TRANSDUCER CALIBRATION 1 Set mode switch to 8 Display will read To continue when SEE SERVICE MANUAL appears press ENTER If ENTER ACCESS appears use LEFT RIGHT and INCREMENT switches to set access identification to H337N and then press ENTER Display 2 appears only if tester has been turned off since the last time access identification was set 1 2 2 3 SEE ENTER INTERNAL VOLTAGE SERVICE ACCESS TRANSDUCER PRESSURE MANUAL CALIB CALIBRATE A calibration source VOLTAGE or PRESSURE will be flashing Select desired source with CHANGE button Proceed at step 2 if VOLTAGE was selected and at step 8 if PRESSURE was selected 5 8 THIS DOCUMENT 15 SUBJECT TO THE LEGEND RESTRICTIONS ON THE TITLE PAGE 2 Press ENTER Display will read FULL SCALE EQU 101 80 IN HG or 50 00 P S Bottom line will be flashing Select desired units IN HG or 8 1 with CHANGE button 3 Press ENTER Display will read SPAN EQUALS X XXX VOLTS and one digit of VOLTS will be flashing 4 Set span voltage from a calibration sheet using LEFT RIGHT and INCRE MENT switches 5 Press ENTER Display will read 1 2 3 SET TO TO SEE PAMB IN COMPLETE SERVICE MODE O CALIB MANUAL 6 Scale transducer per paragraph 5 18 7 Set mode switch to 0 and PRESSURE SELEC
83. sted in the figure The signal is amplified by U9 and offset by U2 on the analog board before being applied to adc con verter U17 An input of 5 will cause U17 to have a full range binary 4095 output Analog switch U3 driven by port A bit 5 from counter port ram U11 on the computer board controls the amount of offset voltage applied to U9 from U2 Port A bits 2 and 3 address one of four decoder U8 which drives analog switch U5 to route the thermo couple signal to U9 4 7 To cancel any effect on the readings as a result of temperature variations in the junction between the tester s copper wiring and the thermocouple wires a compensat ing junction COMP JCT is used the negative lead of the input circuit In close proximity to this junction s a thermistor RT1 for junction temperature measurement The microprocessor reads the thermistor signal and aca references the ther mocouple readings to 0 C 4 8 AMBIENT TEMPERATURE MEASURING CIRCUIT Figure 4 3 shows the circuit used to measure ambient temperature RTD probe which has a resistance of proximately 108 ohms at 70 F is connected to connector U9 amplifies the signal before it is applied to ADC U17 Should the probe open 5 will charge filter capacitor C4 through resistors R43 R19 and R20 causing an upscale drift in the am bient temperature display 4 3 THIS DOCU MENT IS SUBJECT TO THE LEGEND RESTRICTIONS ON THE TITLE PAGE
84. strobe data are input to the CPU via the AD 0 7 lines The RD line is in the TRI STATE mode during BREQ BACK cycles Write Strobe WR While the WR line is low valid data are output by the CPU on the AD 0 7 lines The WR line is in the TRI STATE mode during BREQ BACK cycles A 7 10271 Continued Clock CLK CLK is an output provided for use as a system clock The CLK output is a square wave at one half the input frequency Interrupt Acknowledge INTA Active low The interrupt acknowledge output is ac tivated in the M1 cycle S immediately following the t state in which the INTR input is recognized Output is normally used to gate the interrupt response vector from the peripheral controller onto the AD 0 7 lines It is used in two of the three interrupt modes In mode 0 an instruction is gated onto the AD 0 7 line during INTA In mode 2 a single interrupt response vector is gated onto the data bus otatus SO S1 Bus status outputs indicate encoded information regarding the ensuing M cycle as follows 51 50 0 0 HALT 0 1 WRITE 1 0 READ 1 1 OPCODE FETCH INPUT OUTPUT SIGNALS Power Vcc 5 supply Ground GND O volt reference Crystal or R C XIN XOUT XIN may be used as an external clock input Multiplexed Address Data AD 0 7 Active high At RD Time Input data to CPU At WR Time Output data from CPU At Falling Edge Of ALE Time Least significant byte of address d
85. such government for emergency repair or overhaul work by or for such government under the conditions of i above Therefore the data contained herein is restricted to limited rights and is proprietary to Howell Instruments Inc Limited rights are not subject to an expiration date This legend shal be marked on any reproduction hereof in whole or in part _ THIS DOCUMENT 15 SUBJECT THE LEGEND RESTRICTIONS ON THE TITLE PAGE RECORD OF CHANGES OPERATION AND MAINTENANCE INSTRUCTIONS H337N SERIES ENGINE TEST SET Date of Original Issue 15 September 1988 Instructions for updating manual Remove old pages and replace with new pages having latest change number Latest changes are indicated by change bars in the margins Lu Tnm No No Date No No Date Te 4 uza 1 4 11 7 94 _ 3 1 34 4 11 7 94 4 17 4188 4 117 94 76 4 11 7 94 7415 4 11 7 94 738 4 11 7 94 SI E MENT ee A SE DAA a ene ERBE ee A E TEN 11 le eS ANA EEE E E ESE SES SEA BEN ____ MN IA NE ee SES IAEA MEME Change 4 THIS DOC
86. t straight for easy insertion Only outside paper surface is treated for printing 7 nsert paper in slot formed by paper guide and print head until paper appears at front panel opening Pull paper through front panel slot close load bracket by pressing it downwards and check that when power is EOP LED turns off If not paper is not in proper paper path DTH light should be on when power is on 8 Slide printer mechanism back into housing until both slide latches latch Advance paper by momentarily setting switch to FEED Place switch in center position for normal operation 3 5 LOADING INTERNAL PRINTER PAPER HOWELL PN C15055 MFE INSTRUMENT CORP PN PT21B1 IN PRINTER MAP 21CBC FIGURE 4 11 SHEET 6 1 Loosen captive screws in PRINTER ACCESS door and lower door 2 Hotate the paper advance knob figure 4 11 downward to advance any remaining paper out of the printer Lift up on the head release lever to raise the print head from the roller 3 Liftup on both slide latches to release the slide assembly and pull the slide out of the housing until it stops Lift the spent paper roll and axle from the notches in the slide assembly Slide the axle out of the used paper roll DO NOT DISCARD THE AXLE 4 Breakthe seal on the new roll of paper Tear off and discard the first layer of paper including the glue or tape seal Tear or cut cleanly for easy paper insertion Slide the axle into the new paper roll and position the axle
87. ternal pressure transducer calibration is the same as that used with another engine type answer YES and proceed at step 23 not answer NO and proceed at step 24 Select answer with CHANGE button 23 Press ENTER Display will read TYPE XX XXXX IN HG or P S Y YYY VOLTS where XX is the first engine type for which an external pressure transducer calibration has been stored Use CHANGE button to step through external pressure transducer calibrations If a calibration appears which satisfies the requirements of the selected en gine type proceed at step 14 If all external transducer calibrations are stepped through twice and one is not selected then display will read DO EXT TRANSDUCER CAL POS 7 Complete paragraph 5 6 for the selected engine type and return to step 1 24 Press ENTER Display will read DO EXT TRANSDUCER CAL POS 7 Complete paragraph 5 6 for selected engine type and return to step 1 5 18 INTERNAL PRESSURE TRANSDUCER SCALING Internal pressure transducer scaling allows the operator to scale the internal transducer readings in IN HG 5 1 or MBAR 1 Turn mode switch to 5 Display will read 1 2 INTERNAL SELECT TRANSDUCER ENG TYPE XX SCALING 2 Turn ENGINE TYPE SELECT switch to desired position NOTE PINT or PEXH must be selected in the next step if tester is to display EPR for engine type 5 21 Revised 9 22 88 THIS DOCUMENT IS SUBJECT TO THE LEGEND RESTRICTIONS ON THE TITLE
88. transmitters These circuits provide noninverted 3 state outputs 1Y1 G T 2 243 1Y3 2A2 174 a Yee 2 EA 274 142 273 1A3 272 144 2Y1 GND A 17 10816 OCTAL D TYPE TRANSPARENT LATCHES These 8 bit registers feature totem pole three state outputs designed specifically for driving highly capacitive or relatively low impedance loads The high impedance third state and increased high logic level drive provide these registers with the capability of being connected directly to and driving the bus lines in bus organized system without need for interface or pull up components The eight latches are transparent D type latches meaning that while the enable is high the Q outputs will follow the data D inputs When the enable is taken low the output will be latched atthe leve of the data that was set up Circuit operation is summarized in the function table LATCH ENABLE pec po M m ttre OUTPUT 10 10 2D 20 30 40 40 GND CONTROL Function Table OUTPUT ENABLE CONTROL G OUTPUT t __ Ho Jt H high level steady state low level steady state Qo level of before the indicated steady state input conditions were established X irrelevant any input including transitions 2 off high impedance state of a 3 state output A 18 10819 QUADRUPLE 2 INPUT POSITIVE NAND GATES If a
89. ures 5 30 Opening and Closing Tester Assembly 5 31 Replacement of Internal Pressure Transducer 5 32 Replacement of Internal Printer iii 5 19 Displaying and Printing Stored Calibration and Scaling Data Page TABLE OF CONTENTS Continued Section Page V 5 33 Replacement of Display Board Components 5 30 5 34 Replacement of Pushbutton Switches 5 31 5 35 88 d pred ea ames 5 31 DIAGRAMS een 6 1 Vil ILLUSTRATED PARTS BREAKDOWN Tr NAWOGUCUON 7 1 753 Pais Std 7 1 7 5 Symbols and Abbreviations 7 1 7 7 Maintenance Parts List MPL 7 1 NUMERICAL INDEX 1 2 a 7 54 VII APPLICATION DATA ds ld 8 1 DESCRIPTIONS OF INTEGRATED CIRCUITS 1 ACCEPTANCE TEST B 1 Change2 THIS DOCUMENT IS SUBJECT THE LEGEND RESTRICTIONS ON THE TITLE PAGE Notice Howell Instruments Inc no longer releases assembly drawings wiring schematics Functional Descriptions or illustrated parts lists except to authorized repair stations For repair or replacement please contact Howell Instruments Inc 8945 South Freeway Fort Worth TX 76140 817 336 7411 Figure je 3 1 3 2 3 3 4 1 4
90. uring memory reference cycle 8 bit port address during I O reference cycle During BREQ BACK cycle High Impedance INPUT PROTECTION All inputs are protected from static charge with diode clamps to both Vcc GND Normal precautions taken with MOS devices are recommended OMAN OA rh NSC800 10272 RAM I O TIMER The NSCsi0 is RAM I O TIMER device contained in a standard 40 dual in line package This chip functions as a memory an input output peripheral interface and a timing device The memory is comprised of 1024 bits of static RAM organized as 128 x 8 The I O portion consists of 22 programmable input output bits arranged as three separate ports with each bit individually definable as an input or output Port bits can be set or cleared individually and can be written or read in bytes Several types of strobed mode operations are available through Port A The timer portion of the device consists of two programmable 16 bit binary down counters each capable of operation in any one of six modes Timer counts are extendable by one of the available prescale values A 9 10354 QUADRUPLE 2 INPUT POSITIVE NOR GATES If one or both inputs of a single gate go to the 1 logic level the output will go to the O logic level If both inputs go to the O level the output will go to the 1 level By definition Y A B Circuit operation is summarized in the truth table Vcc 4Y 4B 4A 3Y 3B A 10
91. vances any remaining paper out of printer when roll is nearly empty Figure 4 11 Tester Indicators and Controls Sheet 7 Change 4 4 18 THIS DOCUMENT IS SUBJECT TO THE LEGEND RESTRICTIONS ON THE TITLE PAGE CAUTION When not calibrating the tester do not press ENTER button when one of the calibration modes modes 6 11 is selected Doing this will alter the calibration of the selected parameter It is recommended that a printout of calibration and scaling data be obtained prior to each use of the tester per instructions in paragraph 5 22 NOTE Calibration and scaling procedures of Section V shall have been accomplished prior to using the tester Calibration and scaling values applicable to particular engines are included in Section VIII During normal operation mode switch under SCALING AND CALIBRATION access door must be set to 00 Printer TEST FEED switch must be set to center position With an open input condition NORMAL TEMP SELECT display drifts downscale to approximately 60 C 140 F and TAMB TEMP SELECT display indicates TAMB set value Assure that date engine identification numbers are entered before starting engine 4 18A 4 18B blank Change 4 THIS DOCUMENT 15 SUBJECT THE LEGEND RESTRICTIONS ON THE TITLE PAGE 4 19 POWER UP PROCEDURE 1 Position MASTER POWER switch to OFF WARNING A use a three wire grounded power cable when powering the tester with ac powerl 2 Connect power
92. with the new roll above the notches in the slide assembly Be sure the paper is fed from the top of the roll only the outside surface of the paper is treated for printing 5 Thread the paper into the paper slot and through the mechanism until it comes out the slot of the front panel The PAPER light on the front panel changes from on to flashing 6 Push down on the paper roll to seat the axle firmly into the bottom of the notches Make sure the paper passes straight through the mechanism then lower the head release lever The PAPER light should turn off 7 Pushthe slide back into the housing until the latches engage Press the front panel FEED button to check that the paper emerges smoothly from the mechanism Press the ON LINE button to resume operation 3 6 CABLE FOR OPTIONAL EXTERNAL PRINTER If an external printer is to be used prepare the interface cable as shown in figure 3 2 or 3 3 The printer used with the tester must be set to generate automatic linefeeds when sent carriage returns Change 4 3 2 THIS DOCUMENT IS SUBJECT THE LEGEND RESTRICTIONS ON THE TITLE PAGE 3 7 SETTING EXTERNAL PRINTER BAUD RATE 1 Connect tester power cable to POWER INPUT receptacle and to appropriate power source 2 Turn MASTER POWER switch 3 Set mode switch under SCALING AND CALIBRATION door 11 Display will read 1 2 SET BAUD BAUD EXTERNAL RATE EQUAL PRINTER XXXX where the previously set baud rate or
93. y allow operator to select IN HG MBAR or P S in this step 8 Press ENTER One digit of display value YYYY will begin to flash 9 Set display value using LEFT RIGHT and INCREMENT switches 10 Press ENTER One digit of voltage value will begin to flash 11 Set voltage value that corresponds to display value using LEFT RIGHT and INCRE MENT switches 12 Press ENTER Display will read 1 2 3 SCALING EXTERNAL SELECT COMPLETED TRANSDUCER ENG TYPE XX SCALING Proceed at step 2 to scale additional external pressure transducers used with other en gine types 13 Press ENTER Display will read 1 2 FOR YES IN HG or P S l XX 15 Y YYY VOLTS where XX is the current position of the ENGINE TYPE SELECT switch and XXXX is the previously stored full scale pressure and Y YYY is the previously stored span voltage 5 19 Revised 9 22 88 THIS DOCUMENT 15 SUBJECT TO THE LEGEND RESTRICTIONS ON THE TITLE PAGE resulting from the calibration Tester is waiting for operator to answer YES or NO to the correctness of the calibration Use CHANGE button to select desired answer If answer is YES proceed at step 14 If answer is NO proceed at step 22 Answering NO allows the operator to select a transducer used with some other engine type 14 Press ENTER Display will read 1 2 SCALING SCALING FOR ENGINE XXXX IN HG or 5 1 TYPE XX YYYY units w

H337NP Operations & Maintenance Manual

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H337NP Operations &amp; Maintenance Manual

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H337NP Operations & Maintenance Manual