GL9540 User Manual
Contents
1. 5 5 37248lI amp TALK ONLY CHASSIS GROUND LINE VOLTAGE SELECTOR LINE 115 230 218 0 60 406 Hz 10 VA POWER INLET SOCKET SUPPLY FUSE 200 mA DISPLAY The display area is covered by a red monochromatic filter to inhibit stray or reflected light From left to right the display information is a Fixed minus sign when measuring a negative temperature b Numeric indication 7 bar segment light emitting diodes LED s are used to present the result of measurement or other information c Fixed decimal point positioned between third and fourth 7 segment LED s INVALID READINGS An invalid reading is displayed as follows i M LILILI LILILIUI Jhis will occur if a measurement outside the specified limits of temperature is attempted The limits are degrees centigrade 200 C to 240 or degrees fahrenheit 328 F to 464 1 7 BUTTON ILLUMINATION Button indicators are illuminated as a result of selecting the required functions Button illumination also verifies the selected overall state of operation including control via the IEEE 488 interface REMOTE he Remote Button indicator is illuminated when the instrument is under remote control Any initial command over the bus will illuminate the Remote Button indicator 1 8 RACK MOUNTING By use of the optional Rack Mounting Kit 18127 01 01 the 9540 may be mounted singly or side by2. A3 zu m o ME rR PRECISION DIGITAL THERMOMETER NOTICE The contents and information contained in this manual are proprietary to Guildline Instruments They are to be used only as a guide to the operation of the equipment with which this manual was issued and may not be duplicated or transmitted by any means either in whole or in part without the written permission of Guildline Instruments Ltd 0M9540 A 01 ADDENDUM Manual Number OM9540 A 01 Details Page 3 4 OPERATING PROCEDURE add NOTE the line power is switched off and on in under 2 seconds the microprocessor could latch up If this condition should occur switch the power off wait 2 seconds and then switch the power on ADDENDUM Manual Number 0 9540 01 Details Page 2 1 Temperature Table RANGE RESOLUTION Z4HRS 9O0DAYS 1 YEAR C or F 25 1 25 Lt E 25 180 to 240 0 001 0 0153 0 03 0 03 356 to 464 40 to 180 C 0 001 O 01 0 015 0 03 40 to 356 F 40 40 F 001 0 01 0 015 0 03 4 1 to 100 C 0 001 0 01 0 015 0 03 41 to 148 F 0 002 DEG 0 002 DEG 0 002 DEG 100 148 0 001 Q 1 0 115 0 15 101 to 200 0 001 O 1 0 113 0 13 149 to 328 F 0 02 DEG 0 02 DEG 0 02 DEG RECEIPT AND INSPECTION GENERAL Remove the instrument from its shipping container instrument was thoroughly tested and ins
3. scale deflection pest On Ow the paper Note Some recorders are preset to e nominal LO V Taput without ful scale adjustments in either direction For recorders of these types input attenuation will be required for full scale Press REC CAL again and zero volt Sigal will be output from the recorder output terminals Note The REC CAL button has now been set back to the 15 position Press REC CAL again and automatically upon selection of either REC 0 or REC GAIN X100 the current temperature reading will be output as the set point equal to 0 V output i e this defines the datum and can be any temperature over the full range of measurement If REC GAIN X100 sensitivity is Peu red gs resolution investigation press REC GAIN X100 If normal resolution is required press REC If during a recording it is required to change the resolution from REC to REC GAIN X100 or visa versa d new CAL routine must be performed steps 9 and 10 only This redefines a new datum recheck the zero datum at any time press REC CAL only once and then return to either REC or REC GAIN X100 whichever was already in use IEEE 488 REMOTE CONTROL Ihe built in IEEE 488 interface allows connection of the Model D54D the standard Instrumentation Bus This allows remote control of all from pane Settings and femore readout oT tre full display The interface has the following features complete b
4. 5 red 708 prt 100 004 PROGRAM 2 Test 2 Taking 5 consecutive readings 0 3 1 wrt 708 5 2 708 3 prt 4 5 if If5 gto 1 100 025 100 024 100 024 100 023 100 022 Chapter 4 Heference Temperature The 9540 s measurement specification can be verified using the following procedure The optimum two points for the calibration of of this instrument i e the primary reference temperatures are 0 and 164 C PREPARATION OF A SUITABLE ICE BATH FOR CHECKING THE ICE POINT Correct and careful preparation of an ice bath is extremely important to prevent the ice point variation from being too large Errors of 0 01 C are common in ice baths due to poor preparation The following procedure if carefully followed should produce an ice point within 0 0005 C of the true value The equipment required for ice point checking is as follows a wide mouth dewar flask about 8 cm 3 I 0 and 25 cm 10 deep b A larger dewar of approximately 15 cm 6 1 0 and 40 cm 15 deep C source of clean and pure shaved ice d new unused pail to hold the shaved ice which will never be used for anything else e Pure water either distilled or de ionized f An aluminum or stainless steel stirrer shaped as shown in the sketch AAA A pair of light rubber gloves It is extremely important that all equipment be clean and rinsed to eliminate any contamination
5. T POWER push on push off applies line power to the instrument no remote control facility FILTER select to increase integration time REC 0 switches on analog output mm Aa 112 THERMOMETER REMOTE SAMPLE display retains last commanded reading update occurs each time button is pressed 1 E I A Mi 9 iir n F d e 242 ay j n is 234 van a hi PRESA TIER t XE i Hal is REC CAL selects fixed outputs for analog recorder IECUR REMOTE control by remote commands released for local operation CONT display is updated repeatedly REAR PANEL CONNECTORS CONTROLS RECORDER OUT IEEE 488 INTERFACE ADDRESS LINE VOLTAGE POWER INPUT 1 5 Utilized to connect chart recorders Utilized to connect to other devices controllers on the General Purpose Interface Bus IEEE 488 STD 1978 revision Selects IEEE 488 address between O and 31 and selects talk only or talker listener mode Selects line voltage 115 V down or 230 V up Accepts standard three core moulded line cord 1 6 9540 REAR PANEL MESE EPI ee Sii Al E bami i i UE 4 FEST MET Ted E AND ur DU T iN gt INSTRUMENTS L FALLS OMTASES IEEE 488 ANALOG HI OUTPUT ANALOG LO OUTPUT signal ground ADDRESS 1
6. ations Specifications TEMPERATURE Accuracy GUARANTEED PERFORMANCE including supplied probe Limits of Error F 90 days 1 Year 23 C 5 C 23 5 Resolution deg or F 23 C 1 C Range 200 C to 40 328 to 40 F 40 C to 180 C 40 F to 356 F 180 C to 240 C 356 F to 464 F _ Total guaranteed performance is worst case It assumes all contributing errors are maximum and occur at the same time and in the same direction Contributing errors include calibration uncertainty which is referred to flowing water at the rate of 1 m s repeatability stability temperature coefficient linearization plus sensor and electronics drift and probe self heating Temperature coefficient lt x 0 0005 deg C deg C lt 0 0009 deg F deg Repeatability 2 least significant digits Warm uptime 5 30 seconds to full rated accuracy Time constant 7 5 seconds Self Heating cuts xa uana 0 015 deg C at 23 deg C in flowing water at 1 m s milli AMM eed lOsec digital filter Jo PSS Kee SORE 1 5 sec per reading filter out General Power Supply voltage switch selected 95t0 130V or 190 to 260V frequency 5 8554 5858 50 60 400 2 consump
7. ck panel of the Model 9540 DEVICE DEPENDENT COMMANDS See Table 3 2 The Model 9540 accepts ASCII characters over the bus general each character causes the same action as a single front panel button command read command from the thermometer will take the number from the display selected by C F TABELE 351 ADDRESS SWITCH SETTING FOR BUS ADDRESS Address Switch Setting Charscters Switch Aes My Listen My Talk 2 4 8 16 Address Address O 0 0 0 0 SP O 1 1 0 2 i B 1 1 3 C O 1 4 D 1 1 O 5 y E 0 1 1 0 0 6 8 1 1 1 0 0 7 G 0 1 8 H 1 1 9 I 0 1 0 1 0 10 J 1 1 1 11 1 1 dno L 41 0 1 1 0 13 1 1 1 14 N 1 1 1 1 0 175 O 1 16 1 17 1 Q 1 1 18 2 R 1 1 1 19 3 S 1 1 20 4 E 1 1 21 5 U 1 1 1 22 V 1 1 1 1 2 3 7 W lO 0 1 1 24 8 X 0 0 1 1 25 9 0 1 1 1 26 7 1 1 1 09 0 0 1 1 1 28 lt O 1 1 1 29 E 0 1 1 1 1 30 gt 2l L 1 d L is mot a Lowe T s n is orff 9 t CONT SAMPLE REG UP REC CAL RECS 100 0 SRQ TABLE 3 2 SEND SEND SEND SEND SEND SEND SEND SEND SEND DEVICE DEPENDENT COMMANDS reset filter send another sending an resets SAMPLE sending S resets CONT note sending a 0 clears REC CAL sending sets a
8. for example CQ to the instrument When the next reading s taken it will set both Bit 6 and Bat of the status byte and put SRQ on the bus This event can interrupt a controlter Which will conduct a serial poll and find bit 6 of the Model 9540 status byte set It 16 to the controller to take action by reading from the interface To turn off further SRQ s send DCL or SDC Example To read from the Thermometer it must be in the remote state Send any of the device dependent commands REMOTE will come on eg send F read Fahrenheit degrees send i read Filter send CU read Centigrade degrees and filter off TALK ONLY MODE For the user who wishes mearly to obtain a hard copy print out of measurement data the 9540 can function as a simple talker only device printer or similar IEEE device 15 simply connected via the bus to the 9540 The talk only switch on the 9540 must be set in the down position TALK ONLY and the printer must be set to LISTEN ONLY The 9540 can then be operated normally under LOCAL control and measured temperature presented to the printer PASTE 7259 STATUS BYTE Status Byte Reading done Response to Serial Poll Service Request Overrange Busy reading not yet valid m w A Unrecognized command SAMPLE READINGS USING HP9825 AS A BUS CONTROLLER PROGRAM 1 Test 1 Taking a single reading T Co fxd 3 clr 708 wrt 708
9. he Model 9540 Digital Thermometer is a microprocessor based instrument used for the precise measurement of temperature The measurement facilities are temperature in degrees centigrade from 200 to 240 temperature in degrees fahrenheit from 328 F to 464 F When the instrument is switched on an automatic self test is performed The display will show each segment of the display being lit as an sequentially from left to right minus sign decimal point and degrees sign all annunciators lit and GP IB address is confirmed The self test is concluded by the instrument indicating temperature in degrees centigrade The displayed measurement can be read directly in degrees centigrade or degrees fahrenheit with annunciation indicated in the display area The displays above are typical for a given measurement CONTROLS With the exception of Power on off all front panel controls are of the membrane switch type an LED is incorporated in each switch as a status indicator and are all programmable via the IEEE interface POWER FILTER SAMPLE CONTINUOUS 1 2 Push on push off applies line power to the instrument Filter on red light on selects a low pass digital filter having an 8 second time constant Filter off red light out normal integration time 1 second To initiate a single reading and hold it A new reading is initiated every time the button is pressed To initia
10. ice should not be touched by the hands at any time but washed rubber gloves can be used provided they do not touch the outside of any containers after washing Even then avoid handling the ice that touches the stem of the thermometer The ice is best made from distilled water or in an ice machine that does not freeze Ball of the water the freezing process helps in the purification and concentrates the impurities in the overflow With commercial ice frozen in large blocks the center of the block should not be used only the clear outer layers which are frozen first Carefully clean the utensils stirrer and thermometer with mild detergent solution then rinse two or three times with tap water and finally with distilled water preparation for taking a measurement at ice point pre cool the 9540 probe in shaved ice Fill the larger dewar 2 3 full with distilled water and add shaved ice using the stirrer Stir briskly to make a slush mixture This mixture should be thin enough that the stirrer wil pass through it easily but thick enough that some ice can be picked up on the stirrer when lifted out slowly Using the stirrer transfer the slush ice to the smaller dewar to within 5 cm of the top Add distilled water precooled to ice point by adding ice just to cover the slush mixture too much will float the ice which must be avoided Thrust the pre cooled 9540 probe deep into the center of the ice mixture but no closer than 5 cm from the bo
11. nalog output to sets analog output to 10 V sets analog output to 10 V sets analog output back to 0 V Sto Select RECS XI00 first for rec JP sets Service request send d DATA FORMAT LOGS 8465 OB 3 CIR LAF typical of the format for a reading of the display selected by either UE gp P NOTE The thermometer must be in the remote state before it will send readings over the bus put into remote send at least one command REMOTE will light and then the display can be read over the bus DEVICE CLEAR The interface also accepts the IEEE 488 selected device clear SDC or device clear DCL commands Receipt of either of these commands causes the Model 9540 microprocessor to restart and initialize the program These commands have the same effect as turning the instrument off and on except that the thermometer is not powered down This process is useful for resetting the bus if it becomes hung up If the thermometer does not seem to respond to device dependant commands send a DCL for example clr 7 on an HP9825 The front panel LED s and display should go through the sequence described in the Operating Procedure If the 9540 responds then send SDC eg clr 708 If this is ignored then it is likely that the wrong address is set on the rear panel switch NOTE In REMOTE none of the controls or switches on the front or rear panel except for REMOTE is operable change the add
12. on ATTENTION SELECT PROPER OPERATING VOLTAGE BEFORE REMOVING THIS LABEL Check that the correct fuse is fitted 200 mA Slo Blo GMA 2 10 for both 115 V nominal and 230 V nominal line voltage Only fuses with the rated current and of the specified type are to be used for replacement Makeshift fuses should never be used The supplied moulded line cord should be plugged into the 3 pin receptacle socket on the rear of the instrument The other end of the line cord must be plugged into a wall socket provided with a protective earth this applies equally to the use of an extension cable Where 3 contact supply outlets are not available a suitable protective earth connection must be made before switching the instrument on Any interruption of the protective earth may possibly render the instrument unsafe Where the moulded plug on the supplied line cord does not match the outlet socket of the local service the plug be removed cable should then be stripped back and replaced with a 3 pin plug of the correct type plug should be wired as follows BROWN LIVE BLUE NEUTRAL GREEN YELLOW EARTH PRECAUTIONS The instrument should be disconnected from the line supply before any attempt 1S made to remove the cover The integral platinum resistance probe of the 9540 should only be immersed in a fluid from tip to shoulder approximately 8 cm Immersion depth 8 cm Although of rugged stainles
13. pected before shipment and should be free from any electrical or mechanical damage when received Nevertheless you should perform an inspection for physical damage ensure all items on the packing list are present and test the instrument electrically as soon as possible after receipt Refer to the warranty card at the front of the manual if any damage or deficiencies are found WARRANTY REGISTRATION The warranty card found at the front of the manual should be completed and returned to Guildline Instruments immediately for registration The completion and return of this card will ensure that all Field Service Bulletins and Technical Manual Addenda are forwarded to you SHIPPING CONTAINER We recommend that the sh pping container be retained for future storage or transportation of this instrument Chapter 1 Chapter 2 Chapter 3 Chapter 4 TABLE OF CONTENTS Introduction General Description Front Panel Controls Front Panel Rear Panel Controls Rear Panel Display Rack Mounting Specifications Operating Instructions Preliminaries Precautions Operating Procedure Power Sequence Temperature Measurement F Temperature Measurement Analog Recording Recorder Calibration IEEE 488 Remote Control IEEE Address Switch Setting Device Dependent Commands Sample Readings Primary Reference Temperature PAGE 3 4 3 4 3 5 3 6 3 3 7 3 9 3 10 3 10 3 17 Chapter 1 Introduction T
14. rent where XX is the selected address nu AR n Following the segment check is displayed as follows address shown as 08 set indicates 0 C and the 9540 is Finally observe that the display is ready for use measuring temperature and 3 4 TEMPERATURE MEASUREMENT ls Switch Power on Emsure REMOTE button indicator is off lee operations unless REMOTE operation is required in which case refer to the appropriate part of the Manual button indicator Wild Tit indicating mode default condition on power up Press SAMPLE for each single reading required or CONT for repetitive measurement Read the displayed value in C from the display If the display indicates an invalid reading then the temperature being measured is outside the specified limits see Section 2 SPECIFICATIONS If the readings displayed are noisy due to external interference the filter can be selected to increase the integration time and stabilize the readings TEMPERATURE MEASUREMENT Switch Power on Emsure REMOTE button 18 le 1661 operation unless REMOTE operation is required in which case refer to the appropriate part of the manual Press EJE buttons Iodicator off indicating mode Press SAMPLE for each single reading required or CONT For repetitive measurement Read the displayed value in F f
15. ress or talk only switch the 9540 must go through the power up routine for any change to be recognized SDC DCL lets you reinitialize the thermometer 3 5 LOCAL LOCKOUT ly n REMOTE y the Front panel MS de activated except For Depressing this control will return the Tastrgmente to local front panel operation However the bus controller may send the bus command LLO local lockout lity this Case the REMOTE Button ts also inoperative To regati local control send go to local command from the bus controller er remove the REN remote enable signal from the bus or turn the power off and on STATUS BYTE Table 3 3 shows the status byte which is the Model 9540 s response to a serial poll a Bit 7 is set high when the requested measurement is ready Each time the Thermometer updates the coresponding display bit 7 is set The bit is cleared when the controller reads the result b Bit 6 Service Request is set for each reading if an S command has been sent Reading the statusbyte clears this bit after the read operation is completed e Bits 4 5 dee d Bit 3 Overrange corresponds to the display flashing e Bit 2 Busy when the A D is in the middle of a reading fo SES M 9 Bit 0 Set Dy any character mot table 9 59 Any wal command will clear bit 0 SERVICE REQUEST The Thermometer can assert SRQ on the bus after a reading is complete Send
16. rom the display If the display indicates a valid reading then the temperature being measured is outside the specified limits see Section 2 Specifications If the readings displayed are noisy due to external interference the filter can be selected to increase the integration time and stabilize the readings ANALOG RECORDING To record temperature changes on an analog chart recorder connect a suitable chart recorder to the outputs on the rear of the 9540 Note that the REC CAL button has 4 positions used in both temperature recording and chart recorder calibration Upon power up the REC CAL button is illuminated and set to its Ist position FULL SCALE OUTPUT FROM THE 9540 IS 10 RECORDER CALIBRATION 1 With the 9540 switched on and reading in or F a zero volt signal will be output from the recorder output terminals 2 Observe that the REC CAL button is illuminated 3 Adjust the chart recorder zero or datum to the required position on the paper 4 Press REC CAL on the 9540 and a zero volt signal will be output from the recorder output terminals again 5 Press REC CAL on the 9540 and a 10 V signal will be output from the recorder output terminals 6 Adjust the chart recorder full scale deflection on the chart recorder paper 7 Press REC CAL again and a 10 V signal will be output from the recorder output terminals 3 7 TO b l2 L9 14 Adjust the chart recorder positive full
17. s steel construction the probe is a precision sensor and requires careful handling due to its inherent sensitivity to physical shock Dropped or severely knocked the probe could suffer a resistance shift necessitating instrument recalibration or be broken completely Care should also be taken not to leave the 9540 instrument upside down for extended periods of time build up of liquids can occur in the probe enclosure due to the probe not having been wiped clean after use fluid build up in the probe enclosure will not harm the 9540 in its normal upright position however any immersion could be detrimental due to the possible ingress of fluids into the electronic circuitry After using the 9540 at very cold or very hot temperatures care should be taken not to handle the probe if removed froma fluid without wearing protective gloves on the hands otherwise a severe burn could result instrument The reading digital using the OPERATING PROCEDURE The Model 9540 is a direct following procedure describes the steps to be taken in instrument switch POWER ON SEQUENCE Apply power to the 9540 by depressing the front panel Observe the following display remain for The buzzer will also sound These conditions will approximatly 1 second Next observe that the digits are strobed individually from the in the following manner Lr left to right UN observe that the cur
18. side with another 9540 into a standard 19 rack When using the Rack Mounting Kit the tilt handle must be removed by rotating all the way underneath the 9540 until the base of the handle is positioned at the rear of the instrument Then pull outwards at the pivots and remove four rubber feet must also be removed for rack mounting These can be levered off with a small screwdriver Remove the top cover of the 9540 by releasing the four screws the underneath Put into the four recesses 2 on the RHS 2 p the LHS the speed nuts supplied with the Kit Replace the top cover of the 9540 and retighten the four screws ASSEMBLY OF THE RACK MOUNT ADAPTOR Assemble the Rack Mounting Kit and complete the assembly except for the top strip and one side panel for single mounting or both side panels for side by side mounting Slide in the 9540 and fasten with the 1 2 3 mm screws Complete the assembly of the side panel s and front top strip Install speed nuts 2 each 1 9 2 7150204 B 2 7150204BA THERMOMETER 71502039 2 71502048A B iE dE GUILDLINE INSTRUMENTS LTD j SMITHS FALLS ONT CANADA O 3 71502050 e 2 71502047 71502038 2 71502048A modal _ 9540 RACK MOUNTING KIT INSTALLATION 9540 INSTALLED IN RACK MOUNTING KIT 1 9 a Chapter 2 Specific
19. te repeated measurements each one updating the display Mutually exclusive with SAMPLE Selects readings in either Centigrade red light on or Fahrenheit degrees REMOTE RECORDER OUTPUT RECORDER GAIN X100 RECORDER CALIBRATION FRONT PANEL LOCKOUT 1 3 Enables control by Remote commands via the IEEE interface released for local operation Switches the Analog output on in normal resolution red light on Sensitivity is 5 V 100 degrees Switches the analog output on in high resolution red light on Sensitivity is 5 V degree Selects fixed analog output signals to enable calibration of chart recorders Or verify recorder zero at any time during a run red light on A facility known as FRONT PANEL LOCKOUT is not apparent from the front panel legends Under the control of an external electrical command applied via the IEEE interface the action of al front panel controls except POWER can be inhibited This command signal even disables LOCAL and can be used to prevent unauthorized use of the thermometer when it is committed within a system NOTE EXTERNAL COMMAND VIA THE IEEE LOCAL LOCKOUT CAN BE USED TO INHIBIT ALL FRONT PANEL CONTROLS EXCEPT POWER 1 4 FRONT PANEL REC GAIN X100 increases resolution of analog output selects 9C or 9F 9540 DIGITAL PLATINUM RESISTANCE SS S Jal RY Pe j FILTER BSAMPLER CON
20. tion lt 10 Protection powers pply sameessesususensuauwwerce fused line 100 mA slo blo Environment Temperature working 0 to 50 deg C ce eee eRe 30 deg to 70 deg Maximum operating humidity non condensing 7096 at 40 deg C Shock and Vibrations vascos sese 1gin 3 planes resonance search 5 Hz to 200 Hz Dimensions Height oomen cec S 88 mm 3 46 in Width including handle 228 mm 8 98 in yocant e De 278 10 94 in Weight TIPP 3 0 kg 6 6 Ibs Sensor Dimensions LENGE mamita ClO iim 9 2510 Diameter siria 3 mm 0 1 in Immersion depth 50 mm 2 in minimum Length of sensorcable 2 m 6 5 ft S nsor incapsulation TT Stainless steel INTERFACE built in as standard Protocol and connection IEEE 488 1978 _ Provides full talker listener facilities and remote control of all functions Subset SH1 AH1 T5 TEO L3 LEO SR1 RL1 PP2 DC1 CO Chapter 3 Operating Instructions PRELIMINARIES Set the LINE input selector to the desired voltage DOWN for 115 V UP for 230 V Remove the warning label positioned across the line input socket which indicates that the instrument left the factory set for 230 V operati
21. ttom of the ice Check the reading of the 9540 and verify that it is within its specifications at O C NOTE Occasionally an ice point appears to pass through a minimum then qive a slow rise followed by an almost flat region This is usually caused by soluble salts on the equipment dissolving in the solution causing a depression of the ice point which diminishes as diffusion and melting dilute the solution The second ice point is usually higher when this happens If differences arise ice point checks should be continued with every precaution until several successive readings agree 164 REFERENCE TEMPERATURE The unit is factory calibrated at the 164 C point for linearity and gain The use of a high temperature bath a copper holding block a standard PRT and an instrument more accurate than the 9540 is required to verify the temperature of the bath to 2 mK The copper holding block should be six inches in height and four inches in diameter Two 5 16 diameter holes should be drilled in the center of the block one inch apart and four inches deep The block should be placed in the bath and allowed to stabilize for approximately one hour Ensure that there is fluid flowing over the top of the block The temperature differential of the inside of the block between the two holes should be less than 1 mk Insert the standard PRT and the 9540 PRT into the two holes of the copper holding block Allow to stabilize for approximatel
22. us handshaking talk listen mode for use with bus controllers and talk only mode for simple bus arrangements with another listen only device user Selectable service request facility Service request 15 issued on completion of a new reading model 9540 can be reset to the power on state via the bus complete front panel lockout The temperature measurements both in Celsius and Fahrenheit degrees are available via the interface bus with the same accuracy and resolution as displayed on the front panel The interface has an interlocking scheme so that the data read by the bus controller is always the latest complete reading Seg IEEE ADDRESS ror ppltedt noms wath 2 bus controller put the TALK ONLY Peor panel switch in the up position Select a unique device address from hable 2 1 set Tt on the Pear panel address Syputcehess some bus controllers use ASCII characters to address instruments while others use decimal codes in their software both cases am ASCII character is actually sent Table 3 1 shows the relation between switches decimal codes and ASCII TALK LISTEN address CONNECTION As this interface conforms to IEEE Std 488 1978 the connector has metric threaded retainer screws These are identified by a black finish Connect the thermometer to a bus controller and other instruments with bus cables which have black retainer screws only Up to three cables may be piggybacked in a stack from the ba
23. y 10 minutes Verify the temperature using the standard PRT and measuring apparatus Verify that the 9540 is within its specification at 164 C Notes
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