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1 HP Archive This vintage Hewlett Packard document was preserved and distributed by www. hparchive.com Please visit us on the web! Thanks to on-line curator: Ken Manders

2 OPERATING AND SERVICE MANUAL K A..~, LINEAR PHASE COMPARATOR.. SERIAL NO. S-7418 AND ABOVE HEWLETT-PACKARD COMPANY ~301 STEVENS CREEK BLVD., SANTA CLARA, CALIF. 9~O~O

3 5 MHz on on~ channel and the same frequency from a second source on another channel. These two frequencies are processed within the instr,ument to provide a dcoutput which is proportional to the phase difference between the two input signals. The dc ouptut can be used to drive a potentiometer or galvanometer type recorder for a permanent record of the phase difference. PREPARATION FOR USE Set 115/230 volt switch on the rear panel to expose the correct numbers for the ac line voltage used. Connect power cord to the instrument and an ac receptacle. Turn power switch on and select 5 MHz, 1 MHz, or 100 khz position to correspond with the frequenci~s to be applied. To calibrate the ZERO ADJ and FULL SCALE ADJ controls, apply the same input frequency source to both INPUT 1 and INPUT 2. Then connect the recorder to be used to the rear panel OUPTUT jack. Push ZERO ADJ button and adjust ZERO ADJ control for zero output as indicated on the recorder. Push FULL SCALE ADJ button and adjust FULL SCALE ADJ control for full scale on recorder. The adjustment range of the front-panel FU LL SCALE ADJ control may be centered by the COARSE FU LL 'SCALE control on the rear of the instrument. Repeat the zero and full scale adjustments until both outputs are correct. OPERATION After the K A is calibrated, connect the two frequencies to be compared to INPUT 1 and INPUT 2. The input level should be between 0.5Vrms and 1.1 rms for both inputs. The dc for driving a recorder is from the rear panel OUTPUT jack. Use both OUTPUT terminals, since both are above ground. CIRCUIT DESCRIPTION The K A power supply circuits provide regulated +20 volts dc to operate the instrument. The output voltage is adjustable by a control mounted on the power supply printed circuit board. Input voltage to the K A can be 115 or 230 V ac, ±10%, 48 to 440 Hz as selected by a rear panel SELECTOR switch. The K A phase comparator assembly circuits consist of two channels which receive the two input signals to be compared and control the on/off duty cycle of a flip-flop circuit. The rectangular wave output from the flip-flop is integrated to give an output dc signal which is proportional to the phase difference between the two input signals. For 5 MHz and 1 MHz input frequencies, an oscillator is switched in and heterodyned with the input signals to produce a 50 khz signal in both channels. The full scale width of the Recorder chart is equal to the period of the input signal (that is, for 1 MHz input, chart width is 1 microsecond). To compute the frequency error of the frequency under test, use the relationship E =! ; where E is the frequency error, 0 is the measured phase difference in microseconds, and T. T is the elapsed measurement time in microseconds. For example, if the Recorder chart indicates a full width variation (1 microsecond for 1 MHz input signal) during an elapsed measurement time of 1 hour, the frequency error is: E = 0 T (60) (50) (1 x 10 6 ) 3.2 x or 3.2 parts in frequency error. Enel: None maa75028 HEWLETT-PACKARD COMPANY 5301 STEVENS CREEK BLVD., SANTA CLARA, CALIF

4 b. Connect a DC Voltmeter between red and black wires providing the output from power supply assembly printed circuit board on bottom of instrument. c. Adjust control A2R10 for +20 volts dc output. Disconnect DC Voltmeter. The power supply is protected from overload or a short circuit by an internal circuit in integrated circuit A2U 1. d. Set selector switch to 5 MHz and apply 5 MHz signal at INPUT 2. e. Connect Oscillator to 04 collector (on phase comparator assembly A2 at top of instrument). Tune L4 to 50 khz. The signal will be approximately 1 volt peak-to-peak. f. Connect Oscilloscope to 09 base. Signal should be a negative pulse of approximately 1 volt. g. Set selector switch to 1 MHz and apply 1 MHz signal at INPUT 1. h. Connect Oscilloscope to 014 collector. Tune L3 to 50 khz (approximately 1 volt pip signal), i. Connect Oscilloscope to 010 base. Signal should be negative pulse (approximately 1 volt). This completes the adjustments. HEWLETT - PACKARD COMPANY ",01 STEVENS CAEEK BLVO., SAtHA CLARA, CALIF. 9>050

5 C1 DS1 F1 J1 J2,J3 J4 J4 J4 J4 P1- Q1 R1-R6 R7 R8 R9-R11 R12 Sl S2 S3 S4, S5 T1 W1 XF ' C: fxd, alum elect, 1500 p.f, 40 Vdcw Indicator light, neon/white lense Fuse: 0.25 amp, slo-blo, 115 V Fuse: 0.15 amp, slo-blo, 230 V Receptacle, power: 3-pin, male Connector: BNC Binding post: red Insulator binding post Binding post: black Insulator binding post Power cord plug (part of W1) Transistor, Si: NPN type 2N Not Assigl'1ed R: var, comp, 250 ohms 30%, 1/2W R: var, comp, linear, 250 ohms 10%, 1/2W Not Assigned R: var, comp, linear, 2000 ohms 2%, 1/2W Switch, power: SPST Switch, Slide: DPDT (115/230V conversion) Switch, Rotary: 2 pole 3 position Switch, push button Transformer, power Power cord Body, fuseholder MISCELLANEOUS Cover, top Cover, side Cover, bottom Foot Assembly Frame Assembly side Knob, zero and full scale Knob, frequency selector Panel: front Panel: rear Stand, tilt HEWLETT - PACKARD COMPANY,30r STEVENS CREEK BLVO., SANTA CLARA, CALIF. 9>OSO

6 Cl C2,C3 C4 C5-C7 C8 C9 Cl0 Cll C12 C13 C14 C15 C16 cn C18, C19 C20, C21 C22 C23 C24 C25 C26 C27 C28, C29 C30 C31 C32,C33 C34, C36 C35, C37 C38 C39 C40 C41 C42 C43 C44 C45 C46 C47 CRl CR2,CR3 CR4-CR9 L1 L2 L3 L4 L5 L C: fxd, mylar, 0.1 IlF 20%, 50 vdcw C: fxd, cer, 0.1 IlF +80% -20%, 50 vdcw C: fxd, mylar, 0.1 IlF 20%, 50 vdcw C: fxd, cer 0.1 IlF +80% -20%, 50 vdcw C: fxd, cer, 2121lF 20%,25 vdcw C: fxd, cer, 0.1 IlF +80% -20%, 50 vdcw C: fxd, mica, 2000 pf 2%, 300 vdcw C: fxd, mica, 0.01 IlF 5%, 100 vdcw C: fxd, cer, 2.2 IlF 20%, 25 vdcw C: fxd,mica, 1000 pf 5% C: fxd, cer, 2.2 IlF 20%, 25 vdcw C: fxd, tant elect, 60 IlF 20%, 6 vdcw C: fxd, tant elect, 100 IlF +20% -15%,30 vdcw C: fxd, mica, 56 pf 5%, 300 vdcw C: fxd, cer, 0.1 IlF +80% -20%, 50 vdcw C: fxd, mylar 0.1 IlF 20%, 50 vdcw C: fxd, mica, 1000 pf 2%, 300 vdcw C: fxd, mica, 4700 pf 10%, 300 vdcw C: fxd, mica, 47 pf 5%, 500 vdcw C: fxd, mica, 390 pf 5%, 300 vdcw C: fxd, mica, 1500 pf 2%, 300 vdcw C: fxd, mica, IlF 5%, 100 vdcw C: fxd, mylar, IlF 20%, 50 vdcw C: fxd, mica, 120 pf 2%, 300 vdcw C: fxd, mylar, 0.1 IlF 20%, 50 vdcw C: fxd, cer, 0.1 IlF +80% -20%, 50 vdcw C: fxd, mylar, 0.1 IlF 20%,50 vdcw C: fxd, cer, 0.1 IlF +80% -20%, 50 vdcw C: fxd, cer, 2.2 IlF 20%, 25 vdcw C: fxd, cer, 0.1 IlF +80%, -20%, 50 vdcw C: fxd, mica, 2000 pf 2%, 300 vdcw C: fxd, mica, 0.01 IlF 5%, 100 vdcw C: fxd, cer, 2.2 IlF 20%, 25 vdc""" C: fxd, mica 1000 pf 5% C: fxd, cer, 2.2 IlF 20%, 25 vdcw C: fxd, tant elect, 60llF 20%, 6 vdcw C: fxd, mica, 56 pf 5%, 300 vdcw C: fxd, mica 120 pf 2%, 300 vdcw Diode, Si: 100 ma at +lv, 180 PIV, 1N485B Diode, breakdown: 5.49V 5%,400 MW Diode, Si: 100 ma at +lv, 180 PIV, 1N485B Coil: fxd, 5 mh 10%, 100 ma Coil: fxd, 27 Ilh 10%,200 ma Coil: var, 550 Ilh Coil: var, 30 Ilh Coil: fxd, 5 mh 10%, 100 rna Coil: fxd, 27 Ilh 10%, 200 ma Transistor, Si: NPr~, type 2N708 HEWLETT-PACKARD COMPANY 5'01 STEVENS CREEK BLVD" SANTA CLARA, CALIF, '5050

7 R6 R7 R8 R9 Rl0 Rll R12 R13 R14 R15 R16 R17 R18 R19 R20 R21 R22 R23 R24 R25 R26, R27 R28 R29, R30 R31 R32 R33 R34 R35 R36 R37 R38 R39 R40 R41 R42 R43 R44 R45 R46 R47 R48 R49 R50 R51 R52,R R: fxd, met film, 1600 ohm 2%,1/8 W R: fxd, met film, 510 ohm 2%,1/8 W. R: fxd, met film, 12K ohm 2%,1/8 W R: fxd, met film, 15K ohm 2%,1/8 W R: fxd, met film, 2000 ohm 2%,1/8 W R: fxd, met film, 100 ohm 2%,1/8 W R: fxd, met film, 300 ohm2%, 1/8 W R: fxd, met film, 10 ohm 1%, 1/8 W R: fxd, met film, 1600 ohms 2%,1/8 W. R: fxd, met film, 6800 ohms 2%,1/8 W R: fxd,met film, 510 ohm 2%,1/8 W R: fxd, met film, 2000 ohm 2%, 1/8 W R: fxd, met film, 1000 ohm 2%, 1/8 W R: fxd, met film, 100 ohm 2%,1/8 W Not Assigned R: fxd, met film, 20K ohm 5%, 1/8 W R: fxd, met film, 1500 ohm 2%,1/8 W R: fxd, met film, 1000 ohm 2%, 1/8 W R: fxd, met film, 3900 ohm 2%,1/8 W R: fxd, met film, 150 ohm 2%,1/8 W R: fxd, met film, 243 ohm 1%,1/2 W R: fxd, met film, 18.2 ohm 1%, 1/8 W R: fxd, met film, 20K ohm 2%, 1/8 W R: fxd, carbon film, 683.7K ohm 1%, 1/2 W R: fxd, met film, 18K ohm 2%,1/8 W R: fxd, met film, 1800 ohm 2%,1/8 W R: fxd, met film, 3600 ohm 2%,1/8 W R: fxd, met film, 330 ohm 2%,1/8 W R: fxd, met film, 3600 ohm 2%,1/8 W R:fxd, met film, 1800 ohm 2%,1/8 W R: fxd, met film, 100 ohm 2%, 1/8 W R: fxd, met film, 820 ohm 2%,1/8 W R: fxd, met film, 2000 ohm 2%, 1/8 W R: fxd, met film, 30K ohm 2%,1/8 W R: fxd, met film, 10K ohm 2%, 1/8 W R: fxd, met film, 1000 ohm 2%,1/8 W R: fxd, met film, 10K ohm 2%,1/8 W R: fxd, met film, 4300 ohm 2%, 1/8 W R: fxd, met film, 390 ohm 2%,1/8 W R: fxd, met film, 330 ohm 2%,1/8 W R: fxd, met film, 1200 ohm 2%,1/8 W R: fxd, met film, 10K ohm 2%,1/8 W R: fxd, met film, 330 ohm 2%,1/8 W R: fxd, met film, 1200 ohm 2%, 1/8 W R: fxd, met film, 10K ohm 2%,1/8 W HEWLETT - PACKARD CO MPANY ~'Ol STEVENS CREEK BLVD., SANTA CLARA. CALIF. 9~OSO

8 R58 R59 R60 R61 R62 R63 R64 R65 R66 R67 R68 R69 R70 R71 Rn R73 R74 R75 R76 Rn R78 R79 R80 R81 R82,R83 R84 R85 R86 RS7 R88 R89 R90 R91, R R: fxd, met film, 2000 ohm 2%,1/8 W R: fxd, met film, 56 ohm 2%, 1/8 W R: fxd, met film, 18.2 ohm 1%,1/8 W R: fxd, met film, 1600 ohm 2%, 1/8 W R: fxd, met film, 510 ohm 2%,1/8 W R: fxd, met film, 12K ohm 2%, 1/8 W R: fxd, met film, 15K ohm 2%, 1/8 W R: fxd, met film, 2000 ohm 2%, 1/8 W R: fxd, met film, 100 ohm 2%,1/8 W R: fxd, met film, 300 ohm 2%, 1/8 W R: fxd,met film, 10 ohm 1%,1/8 W R: fxd, met film, 1600 ohm 2%, 1/8 W R: fxd, met film, 6800 ohm 2%, 1/8 W R: fxd, met film, 510 ohm 2%,1/8 W R: fxd, met film, 2000 ohm 2%, 1/8 W R: fxd, met film, 1000 ohm 2%, 1/8 W R: fxd, metfilm, 100 ohm 2%,1/8 W Not Assigned R: fxd, met film, 20K ohm 2%, 1/8 W R: fxd, met film, 1500 ohm 2%,1/8 W R: fxd, met film, 1000 ohms 2%,1/8 W R: fxd, met film, 3900 ohm 2%, 1/8 W R: fxd, met film, 150 ohm 2%,1/8 W R: fxd, met film, 18.2 ohm 1%, 1/8 W R: fxd, met film, 20K ohm 2%,1/8 W R: fxd, carbon film, 683.7K ohm 1%,1/2 W R: fxd, met film, 18K ohm 2%,1/8 W R: fxd, met film, 1800 ohm 2%,1/8 W R: fxd, met film, 3600 ohm 2%,1/8 W R: fxd, met film, 330 ohm 2%, 1/8 W R: fxd, met film, 3600 ohm 2%,1/8 W R: fxd, met film, 1800 ohm 2%,1/8 W R: fxd, met film,4300 ohm 2%,1/8 W HEWLETT - PACKARD COMPANY ~'Ol STEVENS CREEK BLVD., SANTA CLARA, CALIF

9 A Power Supply/Input Assembly The above assembly contains the following replaceable parts. The following reference designators are abbreviated. Add a prefix of A2 to form a complete reference designator for any part. C C: fxd, cer, 0.05 IlF +80 ~20%, 100 Vdcw C C: fxd, mica, 500 pf 1%,300 Vdcw C3 C: fxd, cer, 0.1 IlF % 50 Vdcw CR Diode, Si: 400 PIV, 750 ma U Intgtd Ckt: linear voltage regulator R R: fxd, film, 100K ohm 2% 1/8 W R2,R R: fxd, film, 56 ohms 2%,1/8 W R4,R R: fxd, film, 510 ohm 2%,1/8 W R6, R R: fxd, film, 56 ohm 2%,1/8 W R R: fxd, 1 ohm 10% 1W R R: fxd, flm, 4300 ohm 2%, 1/8 W R R: var, cement, 1000 ohm 10%, 1/2 W R R: fxd, film, 2700 ohm 2% 1/8 W HEWLETT - PACKARD COMPANY ~'Ol STEvENS CHEEK BLVO., SAtHA CLARA. CALIF. 9~050

10 n r I r CR7 CR8 CR4 CR2 QI7 QI6.Q15 Q5 Q6 Q7 CR9 CRG QIO Q9 CR5 CR3 CRI QI4 Q4 QI3 QI2 Q2 Q3 QII L4 L3 QI Q8 FRONT PANEL HEWLETT-PACKARD COMPANY ~301 STEVENS CREEK BLVO., SANTA CLARA, CALIF..,O~O

11 IZ :c m:e... m... ~." :l> (") A l> '" 0 (") 0 3:." l> Z -< '"OJ '1 Vl -1 m <m Z Vl ("') "m m '" '" r- <» 0 N -0 Vl l> a. Z -1 l> ~ m ("') :0 > (J) " l> C -0 () "'0 l> r- r '"' 0'" -< -- Z 0 "'0 r , I 115V25OmAT I... L_::.o~ 2.~~~T_J ~Fl l</ Jl GRA WHT BlK. GRA WI ", P : l '" I LINE I I, I I I EARTH...--t-!-C-' '-:-< ~El C -i» 7\ (J) 0 m (J) (]1 tn s: 0 CO OJ r 0 -<»,,-= I / : NEUTRAL " WHT-BRN NOTES EFERENCE DESIGNATIONS NO PREFIX A2.Cl Cl - 3 DSI CR1.2 Fl JI - 3 PI 01 Ul 51.2 RI - II Tl WI r--+--o,,-,-- UNLESS OTHERWISE INDICATED: RESISTANCE IN OflMS; CAPACITANCE IN PICOFARADS BlK, , :'S3~~~~~ BlK-RED BlK GRN T1 I ern r,15v ' BlK r I~ I L.,-...,-O:J>-- Y:.:E:.:l-J. 1I..._...l!:!; -0 :S2 I '--QJ.- --C)-...--~ -<0 '-' r ---, L"..~~J ASTERISK 1.1 INDICATES SELECTED COMPONENT. AVERAGE VALUES SHOWN f I WHT~BlK-RED LU WHT RED GRA DSI I INPUT 1 Rl 10K rh R4 510 R2 R R3 R5 510 tfl.cl ~F BlU rh R n7 rh BlU 01 A2 POWER SUPPLY/INPUT ASSEMBLY N3055 REGULATOR ~&GRN YEl REFERENCE OESIGNATIONSWITHIN THIS ASSEMBLY ARE ABBREVIATED. ADD ASSEMBLY DESIGNATION AS PREFIX TO FORM COMPLETE DESIGNATION....--<').R:.:E:<D +20V12} RED " +20V13} RED; L"---("~-/ '20V141 ~ ~'}' COMMON BlK'. TOAl -<~ 'h-==-b_l_u._w_h_t-«"'1"_jv,/ir._-,,.-.ob:,:l:,::u,:;-w : PUT / rh TOAl J3~ r.ir~n7-~~..j 1 A o (jl U, o CJ) o»

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