HP AC-4A Application Notes Download | Manualshive

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Summary of Contents for AC-4A

Page 1: ...CADE COUNTER CONTENTS A Block Diagram of Simple Electronic Counter B AC 4A in Basic Electronic Counter Circuit C Driving Circuit for AC 4A D Remote Readout Circuits for Use with AC 4A E Reset Circuits for Use with AC 4A HEWLETT PACKARD COMPANY 1501 PAGE MILL ROAD PALO ALTO CALIFORNIA U S A ...

Page 2: ... DISCRIMINATOR which connects to the INPUT voltage to be counted Fr om this signal input which m a y be a sine wave square wave or pulse the Amplitude Discriminator develops the required driving pulse for the first AC 4A Decade Counter The output pulse of the Amplitude Dis criminator is of the same amplitude and rise time regardless of the amplitude and rise time of the signal to the INPUT GATE wh...

Page 3: ...the application AC 4A DECADE COUN TERS which count all pulses from the Amplitude Discriminator when the GATE 1s OPEN When the GATE is CLOSED the AC 4A s remain indefi nitely on the last count received and display the total as one numeral in each decade illuminated b y a neon lamp The output of one AC 4A Decade Counter will drive the input of the next without additional circuitry RESET It is usuall...

Page 4: ... NEXT f 4Jlr m AC 4A DECADE COUNTER IF USED BLK R BLK Y BLK G BLI X y PRESS TO RESET 15K IOW 3 115V 65MA SELENIUM RECTIFIER X y Rl 3 IOW 2 50 1 X y X 6 H IOOMA 300 y PHOTO TUBE VOLTAGE v 0 I 05 REG ULATEO 5 6K 2W NOTE Adjust the value of Rl3 for 300 volts output from power supply under load Fig 2 Simple Electronic Counter Using the 522B 58B Ampli tude Discriminator to Drive the AC 4A Decade Counte...

Page 5: ... each AC 4A used in addition to 2 l0v regulated at 10 ma 10 5v regulated at 3 ma and 6 3v at 6 amp for the Amplitude Discriminator This counter will count at a maximum rate of 120 kc or more and the total number of digits displayed is limited only by the number of AC 4A I s used To adjust Rl2 a Connect a 1000 cps sine wave to the input of the Amplitude Discriminator Fig 2 b Observe the output at P...

Page 6: ... UT OUTPUT SCHEMATIC DIAGRAM AMPLITUDE DISCRIMINATOR UNIT STOCK NUMBER 5228 58 8 F igure 3 5 COPYRIGHT 1 954 BY HE WLETT R CKARO COMPAN Y T hi drawi nQ rs intended for t he op rofion and maintenance at Hewlett Packard equip ment and i5 not to be use d other w ise or reprod uced wit hout wr itten consent of t he Hewlett Packard Company ...

Page 7: ...gain when the de level at the INPUT crosses approx 0 2 volts going positive from a negative peak An AC 4A driven from this Amplitude Discriminator will count at A if driving from Pin 3 at B if driven from Pin 1 of the Amplitude Discriminator Positive de levels at the INPUT Pin 5 WILL NOT trigger this discriminator An attenuator and a de buck out voltage can be used in the input circuit of the Ampl...

Page 8: ...VALENT CIRCUIT PIN 8 PIN 6 Fig 5 Staircase Equivalent Circuit Staircase voltage output is between base Pin 8 and GND The load on the staircase output including a short has no affect on operation of AC 4A Counter Rg Approx 700k V 135v count of O to 55v count of 9 in approximately equal steps Tolerance on any step is 1 volt The staircase output voltage will vary with the unregulated 300 volt supply ...

Page 9: ...5 IMEG PIN 6 4 3 AC 4A 2 0 PIN 8 R14 1 e MEG Fig 6 Remote Readout of AC 4A Using Ground Return for Meter 1 Reset AC 4A to ZERO 2 Adjust RlS for full scale deflection of meter 3 Step AC 4A one digit at a time and mark meter scale 8 ...

Page 10: ...N 8 680K Fig 7 Remote Readout of AC 4A Decade Counter Unit Using a Circuit that Supplies a DC Bucking Voltage to Permit Use of a Standard Meter Reset AC 4A to ZERO Adjust Rl6 for O reading on meter Stop AC 4A on 9 Adjust Rl 7 for full scale reading on meter Reset AC 4A to ZERO Step AC 4A one di git at a time and mark meter scale 9 ...

Page 11: ...to ZERO 47 INPUT 0 0 ill A f r _L_ Rl9 2MEG 105 200 6 01 RESET PULSE TO AC 4A BASE Pl N 2 _L_ 470 MANUAL RESET Fig 8 Circuit to Reset AC 4A Decade Counters to Zero NOTE A positive pulse at the input to this circuit delivers a 150 volt positive reset pulse with fast rise and slow fall to reset all AC 4 A Decade Counters to ZERO simultaneously This circuit will function if Rl9 is removed and Rl8 is ...

Page 12: ... 2 y 1000 IN34 500 Fig 9 Circuit to Reset AC 4A Decade Counter Units to Nine NOTE A positive pulse at the input to this circuit delivers a 200 volt negative reset pulse with fast fall and slow rise to reset all AC 4A Decade Counters to NINE simultaneously This circuit will function if R21 is removed and R20 is returned to approxi mately 30 volts The AC 4A can be reset to NINE with a manual push bu...

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