HP 5308A User's Manual
Contents
1.2. put to a Low state On the trailing edge of the spike the output of U20B returns High and clocks the AGFF 9H 4 43 Totalize A LU B 9H 4 44 This mode operates in the same manner as does the Totalize A A A B Mode shown in Figure 9H 4 6 except the counter totalizes Channel A pulses while Channel B is held at a specified level The difference between the modes results from a static level change at U11A 13 In this mode the level is Low Input trigger ing is related to the slope switch setting as follows Channel 8 Stope Switch _ 7 Channel B Slope Switch Y Start ge Start Stop AR 9H 4 45 Referring again to Figure 9H 4 6 assume that U7D pin 8 is High After reset and before the first Channel B input pulse the initial conditions are as follows U11A 12 is High since both inputs are Low U20B 6 is Low since both inputs are High When thein put signal goes Low U7C 4 goes High U7D 8 goes Low U20B 6 goes High and clocks the AGFF When the flip flop toggles it removes the Low on U11A 1 2 and results in a Low on U20B 4 Since both inputs are Low the output of U20B also goes Low This enables U20B to respond to the stop portion of the input pulse When the input signal returns High U7D 8 returns High and U20B clocks the AGFF close ending the measurement 9H 4 46 TIME INTERVAL AVERAGE A TO B MODE 9H 4 47 The number of time intervals to be averaged is determined by the TIME BASE switch setting e g 103 10 105
3. 9H 4 5 9H 4 36 At the beginning of the measurement the time zero LOG pulse clocks the AGFF U17A via UTE U7D and U20B This opens the Auxiliary Main Gate at U8B and allows the 10 MHz clock signal to enter the High Speed Decade and the mainframe s counter assem bly At the same time the Channel B signalis sent to the mainframe s Time Base Decade through U21E and D 9H 4 37 In addition to opening the Auxiliary Main Gate the High level at U17A 5 also enables U12A This places a low on the clock input of U17B Once the main frame s Time Base Decade accumulates 10N periods the TB OUT line goes Low which disables U12A and U12D and clocks U17B This places a Low on the D input of U17A allowing the next LOG pulse immediately following to clock U17A and close the Auxiliary Main Gate 9H AA 9H 4 38 Totalize A AA B Mode 9H 4 39 This mode allows Channel A pulses to totalize for the time between Channel B pulses The counter can be used as a stop watch when in the CHK function by using the O C switch to manually start and stop the accumulation of clock pulses Both modes are explained in the following paragraphs Refer to the Totalize A A A B Mode Flow Diagram Figure 9H 4 6 9H 4 40 TOTALIZE A BETWEEN B PULSES Assume that Channel B is set to trigger on the positive slope See Totalize A AA B Flow Diagram Figure 9H 4 6 The first positive going Channel B pulse forces U7C 4 Low and clocks U17A through U7D
4. B TIME AVG A B Sets counter to measure average time interval A to B Channel A starts the interval and Channel B stops the interval The TIME BASE switch blue lettering sets the number of time intervals to be averaged Time interval input range is 1 ns to 10 s there must be a 200 ns deadtime between intervals d TIME A B Sets counter to measure time interval A to B Channel A starts the mea surement and Channel B stops the mea surement Time interval input range is 200ns to 10 s 25ns minimum pulse width The TIME BASE switch black lettering selects resolution of 100ns to 10 s PER AVG B Enables multiple period averages to be made from Channel B with frequencies of 0 to 5 MHz range of 200 ns to 10 s Use TIME BASE switch blue lettering to select number of periods to be averaged 1 to 108 PER B Enables single period measure ments to be made from Channel B with frequencies of 0 to 5 MHz The TIME BASE switch black lettering selects resolution of 100 ns to 10s TOT A LI B Totalizes signals on Channel A during pulses on Channel B Refer to paragraph 9H 3 33 Totalizes signals up to 75 MHz with TIME BASE switch in position 1 blue lettering up to 5 MHz with TIME BASE switch in any other position 10N Figure 9H 3 2 Front Panel Controls and Connectors b TOT A AAR Totalizes Channel A be tween pulses on Channel B Refer to para graph 9H 3 33 Totalizes signals up to 75 MHz with TIME BASE s
5. Ce E 3 e n Gori Q D GS a pd Nn n 3 oi AA DG rm amp E 3 as E amp w ge SE Y k o Oz O 20 s E D Ho 0 ei n Zi A 3 Ss E gt Y o 3 D E E wu D E a E opus HS 5 La si 5 Na o S E 7 E S Sa bo E 2 amp 7 CSR Ea 2 n E oo gt ES Lu oe ms g 3 Pa Lol tw 3 bal 5 Re Lo Di 5 EX E Z gt G 5 n S x lt 3 Gi S g ci D E a 1 2 3 E 5 E op p i E o e 3 a ae 8 2 E o 8 KE Lu A LO En E ix O g a o 4 Q iS Ss e o A o o go q Q O y ea S he y Ke a de o ZS S E a bai Ei O mM aS E m d o SS 8 g a eN mo Re un a id ci ci ay Operation 9H 3 16 Model Model 53084 Theory of Operation SECTION IX H 5308A 75 MHz TIMER COUNTER SUBSECTION IV THEORY OF OPERATION 9H 4 1 INTRODUCTION 9H 4 2 This section describes the circuit theory of operation for the 5308A The overall operation of the 5300B in combination with a plug on module is de scribed in the mainframe portion of the manual 9H 4 3 CIRCUIT OPERATION 9H 4 4 When plugged onto a 5300B mainframe the 5308A can measure frequency frequency ratio period period average time interval and time interval average Single channel and two channel totalize functions are provided The two channel function totalizes pulses on Channel A during pulses on Channel B or between pulses on Channel B Each of these modes of operation is described in the fol
6. Channel A amplifier circuit Conse SETE Se e quently the slope and LEVEL controls SM RALE for este display time for Channel A are effective as listed Set SEP CHK COM B to SEP below The Channel B ATTENUATORS and AC DC switches are effective see Set ATTENUATORS to X10 AC DC to AC Figure 9H 8 1 and Channel A slope switch to polarity desired Set LEVEL A to SET NOTE 11 Set ATTENUATORS Channel B to X10 sia ge AC DC Channel B to AC and Channel A Ensure that the SET TRIG LEVELS slope switch to polarity desired Set LEVEL A switch on the rear panel is in the 0V to SET eo position when the LEVEL control is in NOTE the SET position Ensure that the SET TRIG LEVELS switch on the rear panel is in the 0V position when the LEVEL control is in the SET position Connect input signal up to 75 MHz to be measured to CHAN A connector Observe display If display is not stable n rotate LEVEL A control until trigger light 12 Connect input signal up to 75 MHz to be illuminates If necessary set ATTENUA measured to CHAN B connector TORS switch for Channel A to X1 13 Observe display If display is not stable Set TIME BASE to desired gate time or to rotate LEVEL A control until trigger light AUTO illuminates If necessary set ATTENUA Channel B TORS switch for Channel A to X1 Set FUNCTION to FREQ A and adjust 14 Set TIME BASE to desired gate time or to SAMPLE RATE for desired time AUTO Figure 9H
7. TIME BASE DISPLAY ANNUNCIATOR AUTO 1000000 5 MS A ps 1000000 5 us l us 00000015 us i 10 us 000 00105 s Period Average Self Check Ta 0000 1005 gt 7 Set the FUNCTION switch to PER AVG B Da GE e Set the TIME BASE switch as shown below 10 ms 001000 05 E and observe the display at bo See j TIME BASE DISPLAY ANNUNCIATOR SC RE Ke AUTO 100 00000 Mus e Overflow ei nu i Time interval Average Self Check 10 00000 100 Us 10 Set the FUNCTION switch to TIME AVG 105 0000 1000 Jus A B Set the TIME BASE switch as shown 10 000 10000 MS below and observe the display 105 00100 000 Mus 105 0100 0000 Mus TIME BASE DISPLAY ANNUNCIATOR 10 100 00000 Mus 108 200000 000 AUTO 100 00000 Mus 1 1000000 0 HS e Overflow 10 000000 10 us 102 00000 100 HS Mus Nanoseconds 103 0000 1000 us 104 000 10000 MS 10 00100 000 Mus 106 0100 0000 Mus 107 100 00000 Mus Period Self Check 103 00000 000 8 Set the FUNCTION switch to PER B Set the e Overflow TIME BASE switch as shown below and observe the display Mus Nanoseconds Figure 9H 3 4 Making Self Check Measurements Cont d 9H 3 8 Model 5308A Operation 1 REAR 2 5 11 3 9 4 10 8 14 5 7 11 13 6 5 11 12 SEE WARNING ON PAGE 9H 3 11 Connect ac power to 5300B ac receptacle 10 Set SEP CHK COM B to COM B Turn ac power on with the 5300B SAMPLE NOTE RATE control In the Frequency mode of operation the Channel A CHAN B input is processed by the Set FUNCTION to FREQ A and adjust
8. and U20B 9H 4 41 The Channel A signal passes through U21C and D and enters the mainframe s Time Base Decades The signal is divided by a factor determined by the set ting of the TIME BASE switch As the divided signal returns on the TB OUT line it passes through Q8 USB and D USB and D and the High Speed Decade and returns to the mainframe on the Fl line Immediately after the AGFF was set the Low output of Q disabled U12B and U12D This caused U17B to clock a Low level onto its Q output Upon arrival of the next positive going Channel B pulse the AGFF is clocked in the same manner as before This time however the flip flop transfers a Low level to the Q output which disables U8B and terminates the measurement No further measurements can be taken until the RESET button is pushed This releases the INHIBIT signal from the reset inputs of UL7A and B 9H 4 42 TOTALIZE WITH O C SWITCH This mode operates in the same manner as that described above except that the Channel B pulses are manually produced with the O C switch Pushing the O C switch grounds U16A 1 causing a High level at pin 2 The two cross coupled inverters prevent contact bounce of the O C switch from disrupting the other circuits The differen tiator circuit of C16 and R33 produces a positive spike from the voltage level change at U16 pin 2 This spike passes through U20A to pin 4 of U20B Since this is an exclusive OR gate the two positive inputs force the out
9. colors The 1 us position black lettering pertains to TIME A B and to PER B The 1 position blue lettering pertains to TOT A LI B and to TOT A AALB O C open close Pushbutton switch enables input signals to Channel A to be totalized when the FUNCTION switch selects TOT A AA D Totalizing is initiated by pressing the O C switch and is terminated by pressing the switch a second time To reinitiate the Model 5308A Operation totalize function the reset switch on the front panel of the 5300B mainframe must be pressed An additional function of the O C switch is to operate the display as a stop watch see Figure 9H 3 12 LEVEL A and LEVEL B Used in conjunction with ATTENUATORS switch to determine voltage at which triggering occurs for Chan nel A or Channel B In SET position trigger ing is centered around 0 volts when the rear panel SET TRIG LEVELS switch is in the OV position Trigger level is continuously variable over the range of 2V ATTENUA TORS IN X1 or 20V ATTENUATORS in X10 Adjacent lamp indicates when ampli fier triggering occurs CHAN A and CHAN B Input connectors for Channel A and Channel B Input impedance is 1MQ shunted by less than 48 pF By using a 10 to 1 divider probe input impedance can be increased to 10 MO Slope Switch Selects the triggering on posi tive or negative slope of the input signals to Channel A switch on left side or Channel B switch on right side SEP CH
10. not received during the self check refer to the trouble Set the TIME BASE switch to the positions SE procedures in Sec listed below and observe the display ion V Connect ac power to 5300B ac receptacle Frequency A Self Check Turn ac power on with 53008 SAMPLE RATE control Adjust SAMPLE RATE for desired TIME BASE DISPLAY ANNUNCIATOR display time AUTO 10000 000 kHz Set the SEP CHK COM B switch to CHK lus 10000 0090 kHz lus 00000010 MHz NOTE 10 us 0000010 0 MHz 1 ms 000010 00 MHz All display indications are 1 ims 00010 000 MHz count In the 10 position of 10 ms 0010000 0 kHz the TIME BASE switch wait 1s 010000 00 kHz 10 seconds for the count ls 10000 000 kHz display 10s 0000000 0 Hz e OVERFLOW Figure 9H 3 4 Making Self Check Measurements 9H 3 7 Model 5308A Operation Ratio Seli Check TIME BASE DISPLAY ANNUNCIATOR 6 Set the FUNCTION switch to FREQ A B AUTO 1000000 0 us Set the TIME BASE switch as shown below lus 1000000 0 ES and observe the display lus 00000010 us 10 us 000 00100 s TIME BASE DISPLAY ANNUNCIATOR 1 ms 0000 1000 8 ims 00010 000 AUTO 1000000 0 u 10 ms 001000 00 s 1 10000000 is 0100000 0 S 10 0000001 0 is 10000000 S 102 000001 00 10s e000000 00 ks 108 00001 000 104 0001 0000 e Overflow 10 001 00000 108 01000000 Uu Time Interval Self Check sn i S 9 Set the FUNCTION switch to TIME A B Set the TIME BASE switch as shown below s Ovidio and observe the display
11. 3 5 Making Channel A and Channel B Frequency Measurements 9H 3 9 2 m SE F he Z MO E EZ Ei gt 45 ope Q S we E 3 EX A Weg ES A N a m Sp 9 dv oe n pe K O Zo Za en ri mo Mm d Da Gi E ZELDA y Ii 5 5 3 E as Gi opg gt ala E pra w bai S A E Seto als de E z ADA g 23 3 2 2 Sas y EE E 2 2 SR 6 5 RER E a Ex TRES 328 E z n zu EI eg om q Gi D E W Gx NES ef ovo 2 9 ES 22 Sein 3 aa lt S a Fo a go 88 BEBO SE p det 08 OLA zz 3 emi D D D D E 5 o e vi z 2 eb S ri o s a o e Ge a i ES ERSTE 2 gt ce 2 di E SES a a D EZ S a lt E T 2 3 o lia KS i u v S 2354 ES 2 me N A isa ES p 2 M a E 228 S a S Qu ang d Ha y Ka Q ka E B F S Rest i YN 10 Ka SS ni og o E To o ee oc S M es ys B Seier DW Gel O SLA Lo S a O e J o7 Le O ems E i Na oh Qu Ex Ze O yx Ra moa 2 CH EN H sc E amp 2 o Si zaog SE a O S So Lis Sts B oz A A sI Bas ba D BS El Moa 2 4 MOL gt S c amp Q Ad oO mS 2 42 Sq D e gt 5 Do gt Doo 2 28 A O E 3 DI Re NS oO pitt D D D D ur 35 rc N oD xt uf A Li 20 D Gr 6 Model 5308A Operation 1 REAR 2 9 3 5 8 4 7 6 8 7 5 Connect ac power to 5300B ac receptacle 7 Connect lower frequency signal 0 to 5 MHz to CHAN B connector connect higher fre Turn ac power on with 5300B SAMPLE RATE quency signal 0 to 75 MHz to CHAN A control co
12. BASE switch positions 10 through 108 with proper decimal position and annunciator OPERATING TEMPERATURE 0 to 50 C POWER REQUIREMENTS Including 5300B main frame nominally 15 watts WEIGHT Net 0 9 kg 2 Ib Shipping 1 5 kg 3 Ib DIMENSIONS With mainframe 89 mm H 3 x 760 mm W 6547 x 248 mm L 9 SEE WARNING ON PAGE 9H 3 11 For any waveshape trigger error us is less than 0 005 For period average this is less than 0 3 of one period periods averaged for signals with 40 dB or better signal to noise ratio 9H 1 3 TEE Model 5308A Installation SECTION IX H 5308A 75 MHz TIMER COUNTER SUBSECTION Il INSTALLATION 9H 2 1 INTRODUCTION 9H 2 2 This section contains information on unpack ing and inspection storage and shipment installation and removal of plug on and portable operation 9H 2 3 UNPACKING AND INSPECTION 9H 2 4 If the shipping carton is damaged ask that the carrier s agent be present when the instrument is unpacked Inpsect the instrument for damage such as scratches dents broken knobs etc If the instrument is damaged or fails to meet performance tests when used with the 5300B mainframe notify the carrier and the nearest Hewlett Packard Sales and Service Office immediately Performance check procedures are located in Subsection V and Sales and Service Offices are listed in Section VI of the 5300B portion of the m
13. FUNCTION selec tor a TIME BASE selector and signal conditioning controls for use with the Channel A and Channel B input connectors The signal conditioning controls are labeled LEVEL A and LEVEL B ATTENUATORS and AC DC An O C open close switch is provided for Channel B and a SEP CHK COM B switch is pro vided for selecting channel inputs and self check func tion The purpose and use of these controls is described in the following paragraphs 9H 3 5 Function Selector 9H 3 6 The FUNCTION selector selects one of the eight operating modes listed in paragraph 9H 3 2 9H 3 7 Time Base Selector 9H 3 8 The TIME BASE selector provides gate time control for frequency measurements resolution settings for period or time interval mode selection of number of cycles averaged during frequency ratio period average or time interval average modes and provides a scaling factor of 1 to 10 in the totalize mode The AUTO position automatically sets the TIME BASE selection for maximum resolution within 1 1 second measurement time for frequency gate time and for number of cycles averaged in ratio period average and time interval average measurements 9H 3 9 Signal Conditioning Controls 9H 3 10 Four types of signal conditioning controls are provided for each channel A and B input These controls allow adjustment of trigger level and selection of attenuation slope and ac or de coupling The effect of these controls is to minimize inacc
14. HP Model 5310A Battery Pack enables the 5300B mainframe and the counter to be used in areas removed from ac power sources The battery pack provides a minimum of 3 hours oper ation typically 5 hours at 20 to 30 C operating and charging temperature Tables 1 2 and 1 4 of the 5300B portion of the manual lists the battery pack as an available accessory Documentation for the battery pack is also included in Section IV through VIII of the 5300B portion of the manual To prepare the 5300B 5308A for portable operation refer to Paragraph 2 13 and Figure 2 2 of the 5300B portion of the manual 9H 2 1 ere EEEREN NAON e reee 20400938903 tees green Model 5308A Operation SECTION IX H 5308A 75 MHz TIMER COUNTER SUBSECTION Ili OPERATION 9H 3 1 INTRODUCTION 9H 3 2 This section provides operating information and describes modes of operation and operating proce dures The 5308A plug on may be used to measure frequency or frequency ratio up to 75 MHz period to 5 MHz period average to 5 MHz time interval from 200 nanoseconds to 10 seconds and time interval aver age from 1 nanosecond to 10 seconds Signals up to 75 MHz may be totalized on Channel A in the single channel totalize function In the two channel totalize function signals up to 75 MHz may be totalized on Channel A during pulses on Channel B or between pulses on Channel B 9H 3 3 OPERATING INFORMATION 9H 3 4 The front panel contains a
15. K COM B mon B Separate Check Com a SEP Channel A and Channel B are con nected for separate source inputs 1 MO input impedance b CHK Self check verifies that the major ity of the 5300B mainframe logic circuits and the 5308A logic circuits are function ing properly c COM B Disconnects front panel input connector CHAN A and connects CHAN B to the amplifiers for Channel A and Channel B in parallel IMQ input impedance ATTENUATORS Selects attenuation of the input signals to Channel A switch on left side and to Channel B switch on right side a X1 connects input signals directly to input amplifiers b X10 attenuates input signals by a factor of 10 AC DC Selects ac coupling or de BE of the input signals to Channel A switch on left side or Channel B switch on right side Figure 9H 3 2 Front Panel Controls and Connectors Cont d 9H 3 5 Model 5308A Operation T 9H 3 6 SET TRIG LEVELS Three position switch presets the trigger level to the indicated vol tage 13V 0V 15V when the LEVEL control on the front panel is in the SET posi tion With a 10 1 divider probe connected to the CHAN A or CHAN B connector on the front panel the 13V position is used when checking ECL logie circuits and the 15V position is used when checking TTL logic cir cuits The OV position is used when measur ing a symmetrical waveform such as a sine Wave TRIG LEVELS A and B C
16. LEVEL control in SET as described in the preceding paragraph triggering is centered around zero volts de 9H 3 15 0 C open close Switch 9H 3 16 This pushbutton switch controls totalizing of Channel A input signals as described in paragraph 9H 3 34 This switch also controls the stopwatch function as described in paragraph 9H 3 40 9H 3 17 SEP CHK COM B Switch 9H 3 18 This switch provides selection of separate Channel A and Channel B inputs in the SEP position The CHK position enables the self check function as described in paragraph 9H 3 39 and the stopwatch function as described in paragraph 9H 3 41 The COM B position connects the CHAN B connector on the front panel to the Channel A and Channel B ampli fier circuits in parallel 9H 3 1 Model 53084 Operation TRIGGER VOLTAGE RECOVERY VOLTAGE SLOPE O LEVEL HYSTERESIS PSET NOTE E nn ha SLOPE HYSTERESIS NOISE REJECTION VOLTAGE IS CONSTANT FOR EACH ATTENUATOR SETTING AND DOES NOT VARY WITH TRIGGER LEVEL THIS ALLOWS ZERO VOLTS TRIGGERING WITH GOOD NOISE REJECTION ATTENUATOR X1 X10 CHANGES TRIGGER LEVEL AND HYSTERESIS VOLTAGES BY FACTOR OF 1 10 Figure 9H 3 1 Signal Conditioning Using Attenuator Level and Slope Controls SH 3 1S MODES OF OPERATION 9H 3 20 The 5308A provides seven modes of operation in addition to a self check function and a stopwatch function Some modes of operation are available on both channels A
17. OPERATING AND SERVICE MANUAL 15 MHz TIMER COUNTER 5308A ET PACKARD CERTIFICATION Hewlett Packard Company certifies that this instrument met its published specifications at the time of shipment from the factory Hewlett Packard Company further certifies that its calibration measurements are traceable to the United States National Bureau of Standards to the extent allowed by the Bureau s calibration facility and to the calibration facilities of other International Standards Organization members WARRANTY AND ASSISTANCE This Hewlett Packard product is warranted against defects in materials and workmanship for a period of one year from the date of shipment Hewlett Packard will at its option repair or replace products which prove to be defective during the warranty period pro vided they are returned to Hewlett Packard and provided the preventive maintenance procedures in this manual are followed Repairs necessitated by misuse of the product are not covered by this warranty NO OTHER WARRANTIES ARE EXPRESSED OR IMPLIED INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE HEWLETT PACKARD IS NOT LIABLE FOR CONSEQUENTIAL DAMAGES if this product is sold as part of a Hewlett Packard integrated instrument system the above warranty shall not be applicable and this product shall be covered only by the system warranty Service contracts or customer assistance agreements are av
18. P 5300B Measuring System manual as part of Section IX 9H 1 3 INSTRUMENT DESCRIPTION 9H 1 4 When plugged onto a 5300B mainframe the 5308A can measure frequency frequency ratio period period average time interval and time interval average A single channel or a two channel totalize function is provided The two channel function totalizes pulses on Channel A during pulses on Chan nel B or between pulses on Channel B 9H 1 5 Front panel controls are provided for func tion and time base selection and for signal condition ing slope level and attenuation Automatic selection of maximum resolution is provided for the four functions of frequency frequency ratio period average and time interval average measurements Trigger indicator lamps are provided to indicate when internal amplifier triggering occurs 9H 1 6 Rear panel connectors provide a gate output for Z axis modulation of an oscilloscope trig ger level outputs for monitoring the voltage level at which each channel triggers and a time base cutput for use in totalizing period and time interval measurements 9H 1 7 The electrical and mechanical specifications are listed in Table 9H 1 1 9H 1 8 INSTRUMENT IDENTIFICATION 9H 1 9 Hewlett Packard uses a two section nine digit serial number 0000A00000 mounted on the rear panel to identify the instrument The first four digits are the serial prefix and the last five digits refer to the specific instrument I
19. SAMPLE RATE for desired display to X10 AC DC to AC and slope switch to time polarity desired NOTE NOTE In the 10 position of the For periods greater than 10 TIME BASE switch the dis seconds refer to Figure play will be in picoseconds 9H 36 for period mea with no annunciator shown surements Figure 9H 3 8 Making Period Average Measurements 9H 3 12 Model 5308A Operation 1 REAR 7 REAR 29 6 7 5 3 4 5 6 SEE WARNING ON PAGE 9H 3 11 1 Connect ac power to 5300B ac receptacle NOTE 2 Turn ac power on with 5300B SAMPLE RATE When the SEP CHK COM B switch is set control to COM B only the CHAN B ATTENUA TORS and AC DC switches are effective NOTE However both of the LEVEL controls and There must be at least 200 ns between the slope switches are effective STOP pulse and the next START pulse When measuring the time interval between the same polarity slope of two 6 Set ATTENUATORS to X10 AC DC switches pulses from a single source the PER B and slope control switches to settings desired mode should be used 7 If the desired trigger level is not known set the LEVEL A and LEVEL B controls to the 3 Set FUNCTION switch to TIME A B middle of the range in which the trigger light illuminates If the desired trigger level is known connect a DVM to the TRIG LEVEL Set TIME BASE to desired resolution or to connector for each channel on the rear panel AUTO il and set the LEVEL A and LEVEL B contro
20. UTS Separate or Common B GATE OUTPUT Rear panel BNC TTL low level while gate is open may be used to intensity modulate an HP oscilloscope TIME BASE SCALING OUTPUT Available at rear panel BNC FREQUENCY RANGE 0 to 75 MHz Channel A or Channel B GATE TIMES 8 manually selectable times from 1 us to 10 seconds AUTO position selects gate time for maximum resolution within a 1 1 second measurement time ACCURACY 1 count time base accuracy DISPLAY Hz kHz and MHz with positioned deci mal point FREQUENCY RATIO DISPLAY Fa Fb measured over N periods of Fb N 1 to 10 selectable in decade steps with automatic decimal position and annunciators AUTO position selects N automatically for maximum resolution within a 1 1 second measurement time RANGE Channel A 0 to 75 MHz Channel B 0 to 5 MHz ACCURACY 1 count of Fa trigger error of Fb PERIOD RANGE 0 Hz to 5 MHz Channel B RESOLUTION 100 ns to 10 s in decade steps ACCURACY 1 count time base accuracy trig ger error DISPLAY us ors with positioned decimal point PERIOD AVERAGE RANGE 0 to 5 MHz 100 ns to 10 s Channel B PERIODS AVERAGED 1 to 10 manually selectable in decade steps AUTO position automati cally selects number of periods for maximum resolution within a 1 1 second measurement time FREQUENCY COUNTED 10 MHz ACCURACY 1 count time base accuracy trig ger error DISPLAY mus ns us with positioned decimal point
21. a balance adjustment to null the offset between the input and output of Q2 9H 4 10 Comparator U2B compares the output of 32 with the voltage from the LEVEL A control to provide a digital output logic 1 or logic 0 to exclusive OR gate USB Inductors L1 and L2 and capacitors C9 and C10 connected to U2B form a decoupling circuit to reduce the effects of noise from the 5V power supply The slope switch for Channel A is connected to pin 5 of U3B The position of the slope switch determines whether the positive or negative slope of the input waveform will allow gate U3B to be active The two outputs of USB are complementary One of the outputs is applied to U4A UAB and the other output is applied to U1B UID 9H 4 11 The outputs of gate U3B are converted from ECL levels to TTL levels by U4A U4B and applied to the remainder of the 5308A circuits which are TTL logic The outputs of gate U3B are also applied to comparators U1B and U1D which control the illumination of the trigger light indicators 9H 4 12 Comparators UIB and UID use positive feedback from the output through capacitor C20 and resistor R58 to the input to allow the comparators to operate as a one shot circuit The diode capacitor circuit input CR11 C22 or CR12 C29 provides pulse stretching to stretch pulse widths of a few nanoseconds to several microseconds A single transition of the input signal will cause the LED trigger indicator DS1 to flash momentarily When the input fr
22. ailable for Hewlett Packard products For any assistance contact your nearest Hewlett Packard Sales and Service Office Addresses are provided at the back of this manual 019000 4 234 SECTION IX H 73 MHz TIMER COUNTER 5308A OPERATING AND SERVICE MANUAL SERIAL PREFIX 1528A This section applies directly to Model 5308A 75 MHz Timer Counters having Serial Prefix 1528A The sec tion is provided in loose ieaf form for incorporation into the 5300B Measuring System Manual NEWER INSTRUMENTS This section with enclosed Manual Changes sheet applies directly to HP Model 5308A 75 MHz Timer Counters having Serial Prefix numbers above 1528A OLDER INSTRUMENTS Subsection VII of this document contains information pertinent to all older instruments with Serial Prefix 1440A or 1524A Copyright HEWLETT PACKARD COMPANY 1975 5301 STEVENS CREEK BLVD SANTA CLARA CALIF 95050 Printed JAN 1976 MANUAL PART NO 05308 90005 MICROFICHE PART NO 05308 90006 PRINTED IN U S A HEWLETT PACKARD Model 5308A General Information SECTION IX H 5308A 75 MHz TIMER COUNTER SUBSECTION GENERAL INFORMATION 9H 1 1 PURPOSE AND USE OF SECTION IX H 9H 1 2 Section IX H contains the information neces sary to install operate and maintain the HP 53084 Timer Counter Theory of operation parts lists com ponent locator illustrations and a schematic diagram are included Insert this document in the H
23. anual Retain the shipping carton and the pad ding material for the carrier s inspection The Sales and Service Office will arrange for the repair or re placement of the instrument without waiting for the claim against the carrier to be settled 9H 2 5 STORAGE AND SHIPMENT 9H 2 6 PACKAGING To protect valuable elec tronic equipment during storage or shipment always use the best packaging methods available Your Hewlett Packard Sales and Service Office can pro vide packaging material such as that used for original factory packaging Contract packaging companies in many cities can provide dependable custom pack aging on short notice The unit was originally pack aged as follows The original container is a corrugated cardboard box with 200 Ibs burst test HP 9211 1620 The instrument is secured and protected in the box by a top and bottom molded frame of polystyrene foam HP No 9220 1545 9H 2 7 ENVIRONMENT Conditions during stor age and shipment should normally be limited as follows a Maximum altitude 25 000 feet b Minimum temperature 40 F 40 C c Maximum temperature 167 F 75 C 9H 2 8 INSTALLATION AND REMOVAL OF PLUG ON 9H 2 9 The counter must be used with a 5300B main frame to make measurements Mate the counter and the mainframe according to the instructions given in Paragraph 2 11 and Figure 2 1 in the 5300B main frame documentation 9H 2 10 PORTABLE OPERATION 9H 2 11 Use of the
24. ator 9H 3 40 Stopwatch Function 9H 3 41 The CHK position of the SEP CHK COM B switch also provides an electronic stopwatch function when the FUNCTION switch is setto TOTA AA B After the RESET switch is pressed the stopwatch count is started by pressing the O C switch The count is terminated by pressing the O C switch a second time To initiate a new measurement the RESET switch must be pressed 9H 3 42 CONTROLS AND CONNECTORS 9H 3 43 The front panel controls and connectors are described in Figure 9H 3 2 and the rear panel switch and connectors are described in Figure 9H 3 3 9H 3 44 OPERATING PROCEDURES 9H 3 45 The operating procedures for making mea surements in the various modes are listed in Figures 9H 3 4 through 9H 3 12 9H 3 3 Model 5308A Operation 3 3 2 9H 3 4 FUNCTION Eight position switch selects mode of operation as follows blue lettering matches corresponding blue lettering on TIME BASE switch a FREQ A Enables frequency measure ments of 0 to 75 MHz to be made using Channel A FREQ A B Enables the frequency ratio of Channel A signals to Channel B signals to be taken The ratio of Channel A input signals from 0 to 75 MHz to the Chan nel B input signals 0 to 5 MHz can be measured The ratio is averaged over N cycles of the Channel B signal N is selectable from 1 to 108 by the TIME BASE switch Accuracy is 1 count of frequency A trigger error of Fre quency
25. connector and set the SEP CHK COM B to COM B 5 SEE WARNING ON PAGE 9H 3 11 7 REAR NOTE When the SEP CHK COM B switch is set to COM B only the CHAN B ATTENUATORS and AC DC switches are effective However both of the LEVEL controls and slope switches are effective 6 Set ATTENUATORS to X10 AC DC switches and slope control switches to settings desired If the desired trigger level is not known set the LEVEL A and LEVEL B controls to the middle of the range in which the trigger light illuminates If the desired trigger level is known connect a DVM to the TRIG LEVEL connector for each channel on the rear panel and set the LEVEL A and LEVEL B controls for the desired trigger level If necessary set the ATTENUATORS switches to X1 Adjust SAMPLE RATE for desired display time NOTE For time intervals in the range of 10 sec onds to 10 seconds refer to Figure 9H 3 9 for time interval measurements Figure 9H 3 10 Making Time Interval Average Measurements 9H 3 14 1 REAR Model 5308A Operation 6 9 5 6 SEE WARNING ON PAGE 9H 3 11 2 7 10 10 4 1 Connect ac power to 5300B ac receptacle E a Turn ac power on with 5300B SAMPLE RATE control and adjust SAMPLE RATE for desired display time Set SEP CHK COM B to SEP Two Channel Totalizing To totalize pulses input to Channel A between two pulses input to Channel B set FUNCTION to TOT A AA B To totalize pulses input to Channel A w
26. e INHIBIT line resets U17A and B The resultant Low on the Q output of U17A prevents the Auxiliary Main Gate from passing the Channel A signal to the counting decades At the end of the sample rate rundown the INHIBIT line returns High followed by a LOG pulse Gates UTE U7D and U20B couple this pulse to the clock input of UI7A Clocking U17A transfers the High on the D input to the Q output where it opens the Auxiliary Main Gate at U8B 2 It also enables U12A and D and places a Low on the clock input of U17B 9H 4 25 The Channel A signal passes through the High Speed Decade Ul3 and 18 before entering the mainframe on the F1 line As the mainframe begins ac cumulating Fl counts the mainframe s Time Base Decades also begin accumulating 10 MHz clock pulses via U21A and D Once the Time Base Decades reach a count equal to the selected gate time a pulseis generated on the TB OUT line that toggles U17B via Q8 U16C U12A and D The following LOG pulse is sent through Q5 U24A UTE and D and U20B to close the Auxiliary Gate FF thereby closing the Auxiliary Main Gate 9H 4 26 Frequency A B Mode 9H 4 27 The frequency A B mode performs a ratio measurement between the Channel A and Channel B frequencies This mode is similar to the FREQ A mode since a frequency measurement is simply a ratio between the Channel A frequency and the 10 MHz internal clock Instead of sending the 10 MHz clock to the Time Base Decade the counter substitute
27. equency exceeds ap proximately 1 kHz the trigger indicator will remain on This result occurs because both inputs pin 4 UIB and pin 10 U1D are low both outputs are high transistor Q8 is turned on and DS1 illuminates 9H 4 13 ROM U26 Circuit 9H 4 14 To control the different signal paths for each particular measurement as shown in Figures 9H 4 2 through 9H 4 8 a system of combinational logic must be used that is based on the function code In addition the time base code is used in selecting the decimal point and annunciators k u Hz etc as well as the measurement s resolution Because many control lines are needed the 5308A uses a ROM read only memory instead of controlling the logic directly from the front panel switches The 16 output lines from the ROM reflect the programmed logic states of a particular address in the ROM The front panel switches combine to select the ROM s addresses and hence the ROM s output states In addition to controlling the signal flow logic the ROMs outputs also drive the annunciator lines through the U10 inverters The remaining three ROM outputs go 9H 4 1 Model 5308A Theory of Operation to the 4 to 10 line decoder U25 where the 3 lines are decoded to drive the decimal point lines 9H 4 15 When operating in the AUTO mode the AUTO X1 line from J1 activates the Exponent Counter Latch U28 This is a tri state device that is normally in its high impedance off state howev
28. er in AUTO the OD output disable inputs are Low and the device is free to count LOG pulses Since the log pulses occur for each 10N accumulation of the F2 signal they directly represent the magnitude of the measurement being made and can therefore be used to adjust the decimal point and annunciators as the measurement progresses 9H 4 16 When a measurement is in progress the results ofthe previous measurement are being displayed and the exponent counter is being clocked by LOG pulses The output states remain fixed however to maintain the proper decimal point and annunciator for the current display Once the measurement ends both inputs of U19C go Low and allow U28 to transfer its internally stored count to the ROM H 4 17 Automatic Time Base Mode 9H 4 18 When the TIME BASE switch is set to the AUTO position the counter provides a special measurement feature for four modes of operation Time Interval Average Frequency A Frequency A B and Period Average B For any one of these modes the counter will perform a measurement within a one second gate time The gate time is not fixed but for the majority of cases will vary between 0 11 s and 1 1 s 9H 4 19 The measurement starts when the Auxiliary Gate Flip Flop AGFF U17A is clocked by the time zero LOG pulse When the Q output of UL7A goes High it fires the 0 11 second oneshot U23 Since the AUTO X1 line from J1 is Low U24B enables U12E to pass the 11 sec
29. er to which this manual directly applies If the serial prefix is different from the one listed a change sheet is included describing the required changes If this change sheet is missing the information can be sup plied by any Hewlett Packard Sales and Service office listed in Section VIII of the 5300B Measuring System manual Options are listed in Section IX H Sub section VII Model 5308A General information Table 9H 1 1 Specifications INPUT CHANNELS A AND B RANGE DC Coupled 0 to 75 MHz AC Coupled 20 Hz to 75 MHz SENSITIVITY Min 25 mV rms sine wave to 10 MHz 50 mV rms sine wave to 75 MHz 150 mV p p pulse at minimum pulse width of 10 ns Input must be less than 1V rms from 50 to 75 MHz with Attenuator switch in X1 position Sensitivity can be decreased by 10 using Attenuator switch IMPEDANCE 1 MO shunted by less than 48 pF OVERLOAD PROTECTION DC Range Xl DC to 400 kHz 125V rms 400 kHz to 5 MHz Vrms 5x107 Hz 5 MHz to 75 MHz 10V rms X10 DC to 4 MHz 250V rms 4 MHz to 75 MHz Vrms 1x10 Hz AC Ranges DC to 10 Hz 200V peak in addition to above ratings TRIGGER LEVEL Set position centers triggering at O volts or continuously variable over the range of 22 0 V with Attenuator in X1 position or 20V with Attenuator in X10 position Trig ger level available on rear panel BNC con nectors for DVM monitoring SLOPE Independent selection of triggering on positive or negative slope CHANNEL INP
30. etc time intervals During each time interval the mainframe s Time Base Decades record the number of time intervals by counting synchronized Channel A pulses When the counter accumulates the proper number of intervals it terminates the measurement with a LOG pulse Refer to the Time Interval Average Flow Diagram Figure 9H 4 7 for the following descriptions 9H 4 48 The time zero LOG pulse enables the counter to make a measurement by clocking the AGFF U17A This places a High on U8B 2 and allows the gate to pass clock pulses during each individual time interval After the Channel A pulse sets flip flop U6C and D the next 10 MHz clock pulse sets U9B which enables U14A to pass the 10 MHz clock signal The signal accumulates counts in the High Speed Decade and in the mainframe s counter until the Channel B pulse ends the time interval It does this by setting U6A and B allowing the next clock pulse to set U9A The High on the Q output disables U14A from passing the clock pulses Model 5308A Theory of Operation 9H 4 49 The counter continues accumulating clock pulses during the time A to B until 104 time intervals have been measured At this point the TB OUT line goes Low and clocks U17B via Q6 U16C U12A and U12D When U17B sets it places a low level on the D input of U17A The following LOG pulse clocks U17A This ends the measurement by disabling U8B 9H 4 50 TIME INTERVAL A TO B MODE 9H 4 51 A single time interva
31. f the serial prefix on your instrument differs from that listed on the title page of this section there are differences between the manual and your instrument Lower serial prefixes are covered by a manual change sheet included with the manual Figure 9H 1 1 5308A 75 MHz Timer Counter 9H 1 1 Model 5308A General Information 9H 1 10 The printed circuit board within the instru ment is identified by a two section 10 digit part number e g 05308 60001 and a four digit series number e g SERIES 1440A The series number identifies the electrical characteristics of the com plete printed circuit assembly A replacement circuit board assembly may have a different series number than the assembly originally supplied with the instru ment Therefore when troubleshooting a circuit board assembly ensure that the series number on the schematic diagram matches the series number on the board assembly If the series number on the assembly is lower than the number on the schematic diagram in Subsection VIII refer to Subsection VII of this docu ment for change information If the series number on the assembly is higher than the number on the sche 9H 1 2 matic diagram in Subsection VIII the change infor mation is provided in a manual change sheet which is available from the nearest Hewlett Packard Sales and Service Office 9H 1 11 Manual Changes and Options 9H 1 12 The title page lists the serial prefix numb
32. he anel totalizing the Channel A signal is totalized under control of the O C switch when the FUNCTION switch is in the TOT A AA B position Totalizing is initiated by pressing the O C switch and terminated by pressing the O C switch a second time 9H 3 36 For two channel totalizing the Channel A signal is totalized under control of the Channel B signal When the FUNCTION switch is in the TOT A LIB position totalize Channel A during pulses on Channel B the Start and Stop signals on Channel B occur between two successive trigger level crossings in the opposite direction as follows Channel B Slope Switch _ Channel B Slope Switch A Start Stop Start Stop AR PS FUNCTION TOT A TOT ALR Model 5308A Operation 9H 3 37 When the FUNCTION switch is in the TOT A AA B position totalize Channel A between pulses on Channel B the Start and Stop signals on Channel B occur between two successive trigger level crossings in the same direction as follows Channel B Slope Switch _ Channel B Slope Switch ML Stop A Ai SC FUNCTION TOT A AAB 9H 3 38 Self Check Function 9H 3 39 The CHK position of the SEP CHK COM B switch on the front panel provides a position where proper operation of the majority of the logic circuits in the 5308A and 5300B is verified When circuits are functioning properly the 10N counts are displayed for positions 10 through 10 of the TIME BASE switch with the proper decimal position and annunci
33. hile Channel B is low set FUNCTION to TOT A LT B NOTE The position of the Channel B slope switch determines the Channel B trigger level polarity as described in paragraphs 9H 3 36 and 9H 3 37 Set ATTENUATORS to X10 AC DC switches and slope switches as desired Set LEVEL A and LEVEL B to SET NOTE Ensure that the SET TRIG LEVELS switch on the rear panel is in the 0V position when the LEVEL control is in the SET position 6 Connect Channel A input signal to CHAN A connector and Channel B input signal to CHAN B connector 7 Press RESET Display will accumulate the number of counts that occur on Channel A per switch settings of step 4 If trigger lights are not illuminated rotate each LEVEL control until trigger light illuminates If necessary set ATTENUATORS switches to X1 Single Channel Totalizing 8 To totalize on one channel perform steps 1 2 3 and 5 Set FUNCTION switch to TOT A AAR 9 Connect input signal to CHAN A connector 10 Press RESET Press OPEN CLOSE switch to initiate totalizing Display will accumulate at a rate dependent on input signal frequency When display has accumulated the desired number of counts press OPEN CLOSE switch to stop totalizing If trigger lights are not illu minated rotate LEVEL A control until trigger light illuminates If necessary set ATTENUA TORS switch to XI Figure 9H 3 11 Making Totalizing Measurements 9H 3 15 A o
34. l is measured by open ing the gate with the Channel A signal and counting the 10 MHz clock signal or 10 MHz 10N untilthe Channel B signal closes the gate Refer to Time A D Mode Flow Diagram Figure 9H 4 8 9H 4 52 When Channel A triggers it sends a positive pulse to differentiator C30 and R63 The resulting spike sets flip flop U6C and D and places a High on U9B 12 On the next positive going edge of the clock signal the Q output goes Low and enables U14C 9H 4 53 Prior to the Channel A trigger pulse U20B pin 4 was High due to the inputs of ULIA being Low and U20B 5 was High since U7A 1 was Low These conditions caused U20B 6 to sit at a Low level Once U14C 8 goes High it removes the High level at U7D 8 and allows U20B to clock the AGFF The resultant High on the Q output causes U20B pins 4 and 6 to go Low U8B and D pass the divided clock signal to the High Speed Decade and then to the mainframe The Low on U17A 6 is inverted by U12C and U12D to clock U17B The resultant Low on Q enables U17A to close at a later time 9H 4 54 Once the Channel B pulse arrives it sets flip flop U6A and B causing a High on the D input of USA The next clock pulse disabies U14C by plac ing a High on pins 9 and 10 This disables U14C and allows U7D 8 to go High and close the AGFF through U20B The Low on the Q output of U9A enables U14B to pass the 10 MHz clock to the reset lines of U9A and B 9H 4 5 errata ricerca vere
35. lowing paragraphs with the aid ofa signal flow diagram The input amplifiers are described first followed by a description of the ROM circuit that controls the operation and an explanation of the automatic time base mode 9H 4 5 input Circuits Channel A and Channel B 9H 4 6 Theinput circuits for Channel A are basically identical to those for Channel B see Figure 9H 4 2 so only the Channel A circuits will be described 9H 4 7 The Channel A input signal is applied to the front panel CHAN A connector through AC DC switch S9 when the switch is in the DC position or through capacitor C6 when the switch is in the AC position The signal is attenuated by the attenuator circuit R3 R4 C4 C5 when the ATTENUATORS switch is in the X10 position When the ATTENUATORS switch is in the X1 position the attenuator circuit is bypassed The signal is connected through SEP CHK COM B switch S6 when the switch is in the SEP position to the Channel A input circuit 9H 4 8 An overload protection circuit CR1 CR6 is connected between the Channel A and Channel B in puts Specifications for the overload protection are listed in Table 9H 1 1 The associated circuitry provides 2 5V and 2 5V for the clipping diodes CH 2 5 and 6 and for the LEVEL A and LEVEL B controls 9H 4 9 The input to Channel A is applied to zero offset buffer Q2A Q2B The signal voltage at the gate of Q2A appears atinput pin 6 of comparator U2B Variable resistor R27 provides
36. ls for the desired trigger level If necessary set the ATTENUATORS switches to X1 5 If the Start and Stop signals are from sepa rate sources connect the Start signal to 8 Adjust SAMPLE RATE for desired display CHAN A connector Connect the Stop signal time to CHAN B connector and set the SEP CHK l NOTE COM B to SEP If the Start and Stop signals are from a common source connect to For greater resolution of time interval CHAN B connector and set the SEP CHK measurements refer to Figure 9H 3 10 COM B to COM B for time interval average measurements Figure 9H 3 9 Making Time Interval Measurements 9H 3 13 Model 53084 Operation 1 REAR 2 9 3 4 1 Connect ac power to 5300B ac receptacle Turn ac power on with 5300B SAMPLE RATE control NOTE There must be at least 200 ns between the STOP pulse and the next START pulse When measuring the time interval aver age between the same polarity of two pulses from a single source the PER AVG B mode should be used Set FUNCTION switch to TIME AVG A B Set TIME BASE to desired resolution or to AUTO NOTE In the 10 position of the TIME BASE switch the display will be in picoseconds with no annunciator shown If the Start and Stop signals are from sepa rate sources connect the Start signal to CHAN A connector Connect the Stop signal to CHAN B connector and set the SEP CHK COM B to SEP If the Start and Stop signals are from a common source connect to CHAN B
37. nal clock signal is counted in the mainframe s counter assembly during one period of the Channel B signal Before the clock signal is counted itis first divided in the Time Base Decades mainframe The division is a function of the front panel Time Base switch and serves to vary the measurement s resolution Refer to Period B Mode Flow Diagram Figure 9H 4 4 9H 4 32 Atthe beginning of the measured period the output of U4C goes Low and clocks the AGFF U17A via U7C U7D and U20B The resultant High on the Q out put enables the TB OUT signal to pass through the Aux iliary Main Gate and into the High Speed Decade The signal then travels to the mainframe s counter on the F1 line 9H 4 33 When the AGFF was set at the beginning of the period the Q output went Low and caused U12B and D to clock U17B This occurs almost instantly after the AGFF sets and lags only by the propagation delays of the gates themselves Once clocked U17B places a Low on the D input of U17A Thus the AGFF is ready to close the Auxiliary Main Gate at the endofthe period i e the next negative going output of U4C 9H 4 34 Period Average B Mode 9H 4 35 In a period average measurement the counter samples a group of periods and displays the average value The number of periods selected is always in powers of ten 102 10 104 etc and is a function of the TIME BASE switch For the following description refer to Period Average B Flow Diagram Figure
38. nnector Set FUNCTION switch to FREQ A B 8 Set the LEVEL A and LEVEL B controls to the Set SEP CHK COM B to SEP middle of the range in which the trigger light illuminates If necessary set ATTENUA Set ATTENUATORS to X1 AC DC and slope TORS switches to X1 switch as desired Set TIME BASE to desired setting 1 to 108 9 Adjust SAMPLE RATE control for desired or AUTO display time WARNING TO AVOID POSSIBILITY OF BODILY INJURY AND OR EQUIPMENT DAMAGE BE SURE TO OBSERVE POLARITY REQUIREMENTS WHEN CONNECTING TEST LEADS HEWLETT PACKARD RECOMMENDS USING AN ISOLATION TRANSFORMER WHEN MEASURING AC LINE FREQUENCIES ADDITIONALLY DO NOT EXCEED THE INPUT VOLTAGE LIMITATIONS AS SPECIFIED IN TABLE 9H 1 1 Figure 9H 3 7 Making Ratio Measurements 9H 3 11 Model 5308A Operation Aen SEE WARNING ON PAGE 9H 3 11 Connect ac power to 5300B ac receptacle 6 Set TIME BASE to desired resolution or to AUTO Turn ac power on with 5300B SAMPLE RATE control Set FUNCTION to PER AVG B Connect input signal 0 to 5 MHz to CHAN B connector Set SEP CHK COM B to SEP NOTE Ensure that the SET TRIG Observe display If display is not stable LEVELS switch on the rear rotate LEVEL B control until trigger light panel is in the 0V position illuminates If necessary set ATTENUA when the LEVEL control is TORS switch for Channel B to X1 in the SET position 5 Set LEVEL B to SET Set ATTENUATORS Adjust
39. of TIME BASE switch results in increased accuracy 9H 3 25 Period Mode Channel B 9H 3 26 The period mode allows single period mea surements to be made with frequencies of 0 to 5 MHz into Channel B The resolution is selectable from 100 nanoseconds to 10 seconds by the TIME BASE switch Accuracy is 1 count time base accuracy trigger error 9H 3 27 Period Average Mode Channel B 9H 3 28 The period average mode allows multiple period averages to be made with frequencies of 0 to 5 MHz into Channel B The number of periods to be averaged is selected by the TIME BASE switch 1 to 105 Accuracy is 1 count time base accuracy trigger error The 1 count and trigger error is reduced in proportion to the number of periods averaged 9Fi 3 29 Time Interval Mode Channel A to B or Channel B only 9H 3 30 The time interval mode allows time measure ments to be made between points on one waveform or between two waveforms The range of measurements is 200 nanoseconds to 10 seconds minimum pulse width of 25 nanoseconds with resolution of 100 nano seconds to 10 seconds in decade steps A Start signal Channel A opens the main gate and a Stop signal Channel B closes it For Start and Stop signals from a common source the CHAN B input is used and the SEP CHK COM B switch is set to COM B A TTL low output is available at the GATE OUT connector on the rear panel while the gate is open This output is base accuracy
40. ond pulse to the clock input of U1 7B The trailing edge ofthe pulse clocks U17B causing the Q out put to go Low This enables the next LOG pulse to terminate the measurement by clocking U17A 9H 4 20 Recall that a LOG pulse occurs for each 10N event of the F2 signal however any LOG pulses that oc cur prior to setting U17B a delay of 0 11 seconds are ignored The measurement ends with the LOG pulse that occurs immediately after U17B sets This always corresponds to a gate time between 11 s and 1 1 s as illustrated in Figure 9H 4 1 9H 4 21 As an example in explaining the graph in Figure 9H 4 1 assume a period average measurement is being made with an input frequency of 400 Hz One period of 400 Hz is 1 400 0025 s 2 5 ms Since 10 periods must be counted to produce the first log pulse this pulse would occur after 25 ms 2 5 ms 10 This log pulse is ignored since it falls within the 110 ms 11 s delay of the one shot The next log pulse occurs 10 times later at 250 ms 25 ms 10 This pulse ends the 9H 4 2 measurement since the 11 s inhibit time has elapsed The gate time then is 25 s 9H 4 22 Frequency A Mode 9H 4 23 Inthe frequency mode the Channel A signal is sent from U4 4 to the F1 switch see Frequency Mode Flow Diagram Figure 9H 4 2 Gates U5E and U5D couple the signal to USB 3 where it is gated to the counting decades by the Auxiliary Gate FF U17A 9H 4 24 Prior to making a measurement th
41. onnectors provide for measurement of Channel A or Channel B trigger levels by a monitoring DVM The trigger level voltage is measured at the mid point of the hysteresis band GATE OUT Provides a TTL level signal LOW while the 5300B main gate is open Used for time interval measurements to intensity modulate an oscilloscope to indi cate the interval being measured 4 TIME BASE OUT This connector provides two different outputs selectable by the posi tion of the FUNCTION switch as follows a In the TOT A LI Band TOT A AA B positions of the FUNCTION switch the TIME BASE OUT connector provides a scaled divided output of the input signal frequency applied to Channel A The output is scaled by a factor of from 10 to 10 as set on the TIME BASE control b In the PER B and TIME A B positions of the FUNCTION switch the TIME BASE OUT connector provides a scaled output of the internal 10 MHz oscillator fre quency The output is scaled by a factor of from 10 to 10 as set on the TIME BASE control The period of this output is indi cated by the black lettering on the TIME BASE control The same output is pro vided when the FUNCTION switch is in TOT A LF B or TOT A AA B posi tion and the SEP CHK COM B switch is in the CHK position F igure 9H 3 3 Rear Panel Control and Connectors Model 5308A Operation 1 REAR 5 6 7 8 9 10 NOTE 4 Set the FUNCTION switch to FREQ A If proper indications are
42. or B while other modes are available on only one channel In all cases the modes are selected by the FUNCTION switch The modes and functions are a Frequency Mode Channel A or B b Frequency Ratio Mode Channel A B c Period Mode Channel B only d Period Average Mode Channel B only e Time Interval Mode Channel A to B or Channel B only f Time Interval Average Mode Channel A to B or Channel B only g Totalize Mode Single or two channel h Self Check Function i Stopwatch Function 9H 3 2 9H 3 21 Frequency Mode Channel A or B 9H 3 22 Frequency measurements may be made on Channel A or B from 0 to 75 MHz Front panel controls are set to the same relative positions for measurements on either channel with the exception that the SEP CHK COM B switch is set to SEP for Channel A and to COM B for Channel B measurements The LEVEL A control adjusts the triggering point on the input signal for Channel A or Channel B in the frequency mode Accuracy is 1 count time base accuracy 9H 3 23 Frequency Ratio Mode Channel A B 9H 3 24 The frequency ratio of Channel A signals from 0 to 75 MHz to Channel B signals 0 to 5 MHz can be measured The TIME BASE switch setting 1 to 10 selects the number of cycles of the Channel B signal over which the ratio A B is averaged Accuracy is 1 count of Frequency A trigger error of Frequency B Increasing the number of cycles of Frequency B higher setting
43. s In the 108 position of the TIME BASE switch the display will be ps with no annunciator shown TIME INTERVAL RANGE 200 ns to 10 s 25 ms minimum pulse width Separate or Common B RESOLUTION 100 ns to 10 s in decade steps ACCURACY 1 count time base accuracy trig ger error DISPLAY us s or ks with positioned decimal point TIME INTERVAL AVERAGE RANGE 1 ns to 10 s 200 ns dead time between intervals Channels A and B separate or Com mon B INTERVALS AVERAGED 1 to 108 selectable in de cade steps AUTO position selects number of intervals to give maximum resolution with in a measurement time of 1 1 second DISPLAY mus ns us or s with positioned deci mal point In the 108 position of the TIME BASE switch the display will be in ps with no annunciator shown ACCURACY time base accuracy 5 ns Trigger Error 100 ns Y Intervals Averaged TOTALIZE Totalizes Channel A during pulses on Channel B Totalizes Channel A between pulses on Channel B RANGE 75 MHz on Channel A in position 1 of TIME BASE switch 5 MHz in other positions of TIME BASE switch ACCURACY 1 count trigger error on Channel B DISPLAY Displays count Can scale display with annunciator by use of TIME BASE switch to increase count capacity GENERAL NOTE 5308A is compatible with 8 digit 5300B mainframe only CHECK Inserts internal 10 MHz reference fre quency into counting decades Displays 10 counts for TIME
44. s the Channel B signal Refer to the Frequency A B Mode Flow Diagram Figure 9H 4 3 9H 4 28 At the beginning of the measurement the time zero LOG pulse clocks the AGFF U17A via UTE U7D and U20B The resultant High on the Q output opens the Auxiliary Main Gate at USD and allows the Channel A signal from U4A to pass through U5E and D and U8B and D From there it passes through the High Speed Decade and into the mainframe s counter assem bly via the Fl line At the same time the Channel B signal enters the mainframe s Time Base Decade through U21E and U21D 9H 4 29 When the AGFF was set with the time zero LOG pulse it enabled UI2A and U12D and placed a Low on the clock input of U17B Once the Time Base Decades reach a count equal to the selected gate time a pulse is Model 5308A Theory of Operation F2 FREQUENCY Hz 60 80100 D I be AM st O 30 40 OT O tm tO DOC e be pra o a x n Ka 123 bat N Lari q GATE TIME SECONDS Figure 9H 4 1 Gate Time Versus F2 Freguency 9H 4 3 Model 5308A Theory of Operation generated on the TB OUT line that clocks U17B by disabling U12A The next LOG pulse which follows immediately thereafter passes through Q7 U24A UTE and D and U20B and closes the AGFF The Low output of U17A 5 disables USB and ends the measurement 9H 4 30 Period B Mode 9H 4 31 Ina single period measurement the inter
45. uracies in measurements refer to Figure 9H 3 1 9H 3 11 ATTENUATORS X1 and X10 positions both channels The X10 position of the attenuator switch is used to attenuate large amplitude signals The XI position represents no attenuation The switch setting X10 increases the trigger levels and hysteresis voltages by a factor of 10 Ifinput signal levels are unknown the initial measurements should be made with the attenua tor switches set to X10 The setting may then be changed to X1 if necessary to obtain a stable usable measurement 9H 3 12 SLOPE SWITCHES both channels The slope switches allow triggering on the positive slope or the negative slope of the input signals see Figure 9H 3 1 9H 3 13 LEVEL A and LEVEL B The level controls allow adjustment of the triggering point on the input signal waveform With the LEVEL controls set to the 0 position or to the SET position when the rear panel SET TRIG LEVELS switch is in the 0V position as described in Figure 9H 3 3 triggering is centered around zero volts The voltage range over which triggering may be set is 2 volts with the attenuators in the X1 position or 20 volts with the attenuator switch in the X10 position 9H 3 14 AC DC SWITCHES both channels The AC DC switches select ac or de coupling In AC posi tion with the LEVEL control set for triggering centered around zero ac volts the de components on the signal have no effect In DC position with the
46. used to intensity modulate an oscilloscope for display of the time interval measured Accuracy is 1 count time trigger error For more precise mea surement of trigger level connectors are provided on the rear panel for DVM monitoring of the trigger level voltage 9H 3 31 Time Interval Average Mode Channel A to B or Channel B Only 9H 3 32 The time interval average mode provides greater resolution of time interval measurements than the time interval mode provides The 1 count error can be reduced by averaging a number of measure ments In the time interval average mode the main gate is open for the number of time intervals selected by the TIME BASE switch Up to 108 time intervals may be averaged in this mode Since the measurement accuracy is increased by Fiz instead of as shown on the display the displayed measurement should be evaluated by computing the true resolution which is 2100 ns where N is equal to the number of time inter vals selected by the TIME BASE switch For detailed information on time interval averaging refer to HP Application Note 162 1 9H 3 33 Totalize Mode Single or Two Channel H 3 34 Input signals up to 75 MHz applied to Chan nel A can be totalized with the TIME BASE switch in position 1 In all other positions of the TIME BASE switch input signals up to 5 MHz can be totalized The input frequency is scaled by a E equal to the setting of the TIME BASE switch CLON 9H 3 35 For single c
47. witch in position 1 blue lettering up to 5 MHz with TIME BASE switch in any other position 10N 2 TIME BASE Ten position switch performs the following functions a lps 10 us Ims 1 ms 10 ms 1s 1s 10s black lettering Provides eight selectable times as gate time controls for frequency FREQ A measurements b 1 us 1 us 10 us 1 ms 1 ms 10 ms Ja 1 s 10 s black lettering Provides resolu tion of 100 ns to 10 s when FUNCTION switch selects period PER B or time inter val TIME A B mode of operation c 1 10 102 103 104 105 108 107 108 blue lettering Provides selection of number of eycles or events averaged when FUNC TION switch selects frequency ratio FREQ A B period average PER AVG B or time interval average TIME AVG A B d 1 10 102 10 104 105 108 107 108 blue lettering Provides scaling factor when FUNCTION switch selects totalize TOT A LI B TOT A AA B modes of opera tion e AUTO 1 us 1 The AUTO position pro vides four function auto ranging pertains to gray bordered FUNCTION switch posi tions including frequency FREQ A fre quency ratio FREQ A B period average PER AVG B and time interval average TIME AVG A B Provides maximum resolution that can be obtained in each function within a maximum of 1 1 second measurement time f AUTO 1 us 1 The 1 us 1 position per tains to the FUNCTION switch lower half positions corresponding letter
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