HP-410A-Manual 电路图.pdf

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1、I . : HP Archive . . This vintage Hewlett Packard document was preserved and distributed by www. Please visit us on the web ! . . On-line curator: Tony Gerbic RadioFans.CN 收音机爱 好者资料库 P I INSTRUCTIONS MODEL 4-11 HIGH FREQUENCY VACUUM TUBE VOLTMETER I PACKARD HEWLETT c Y RadioFans.CN 收音机爱 好者资料库 C A U

2、T I O N The gray insulating material of the probe of the Model 410A is polystyrene-a loQ rneltihgqoint material. It is necessary when soldering to t;he probe t o prevent the polystyrene from get;$ing too hot. solder to the contact tjhich is exposeI1 when the ?rob(:+ nose Xt is i1Ot possible t.0 i S

3、removed without destroying the pI.ystyrene. ” - I RadioFans.CN 收音机爱 好者资料库 High Frequsncy I I Vacumn Tube Voltmm -t er I I i ! 1 i i i i i i 1 I i 1 I i i i i f i f I i AC Ranges DC Ranges Specifications Frequency Response . . . . . . . +ldb frcn; 23 cps t o I/c!, rriegm;Fcj.cs. kC Indication . . . .

4、 . . . . *. . Proportional to peak vaLlne of applied voltage; instru- I i ment is calibratd t o read rms v J u e of a sine, wave. AC Inpat Impedance . Equivalent t o apyroxirnately 6 megohms shunted by l.3 m m f at low frequencies; the in- put resistmce decreases with incre;zsing f requericy owing t

5、 o dAelectric losses, DC Input Impedance . the effect of emission veloclty current ii? V?-. This current consists of electrons t . At low frequencfcs where relatively high capacities can be tolerated it i s o t neccssstry to remow + ; ) I F ? probe fran Llrc compmtmcnt , Instead connections can bo m

6、a;ero-set the a-c ranges. coillplete ir,formation for t:,:is adjustmer:t is given on p . 22. cycle, single phase power source. Turn the SELECTOR switch from the OFF to the - (minias) position, thus applying power to the instrwmnt, Aflorzt the unit t o b a t for five minutes or aore, More Plug the po

7、wer cord into 3- nominal 115bvoIb, 50/6 Procedure for Meassurinp AC Voltaacs, 2. Vol.tagcs having rrns amplitudes up Lo 300 volts and frs- quencies up to 700 megacycles can be measured with the -hp- Model 41OA by means of the diode probe provided. Note that it is not necessary to remove the probe fr

8、om the t e s t load compartment under certnin conditions as explained under V e s t Leadstt above. 2. Set the SELETB switch to PIC. 3. Set m R O ADJ control so that meter pointer reads exactly zero with RANGE switch set to lv and with the p r o h Im?. shorted to l t s ground lead. 4. Set RAPJGE stdt

9、ch to a range known to be high enough tc! include the voltage to ba measured. -3- i 6. 7. 8. 1 . 2. 3. 4. 4. 6, 7 . Connect thc DC Vol.ts lead t o the high poter,tial side (positive or negative) of the voltage to be rnt3a.u-r3d. Observe usual rules of safety whsn rmking this C O L . ? C ” O , Back o

10、ff the RANGE switch as necessary to obtain a large meter deflection, The calibration of the range switch indtcatos the full- scale value of the meter scale, If %he MNGE switch 1s in a position whose full-scah value is a multj-ple OX“ 10, read the value of tho voltage on the top scale of thc meter fa

11、co. Thus, if tho RANGE switch is in either the I, 10, 100, or 1000 positions, read voltagc on the top scale, using a suitable multiplying factor, I If the W G E stritch i s in a position whoso fulLscalc valuc is a nultiple of 3, read the vaJw of the vol1;nge on the second s c a b from thc top of the

12、 meter hce, Thus, if the RANGE swttch 1s in d t h w tho 3, 30, os 30G positions, read tho second scale, u s h g a suitablz m-il2ti.f- plying factor. J?rocedurc for Neasur.i-ng Resistance Set SELECTOR switch to UHNS. Unless meter has becn zerocd %or AC or DC mcasurcnents, short ends of COMMOl$ode1 41

13、CU directly across a 5O-o?m tt;ransnifssZor, line using Type N connect- ors. This T-joint has been dcsigned so that the comect9on of the Model 4lOA into a transmfssbon Y.be circuit wll.1 not cause an apyreciable standing wave, With the aid of this d.evic:c, measurement of power traveling through a t

14、ransmission line m y be made with good accuracy to 1000 mc. must 5e taken to provide accurate impedance matchfng a:id the elimination of standing waves along the line through which power i s flowing. By using a dumy load z;t the receiving end of thfs I!-joint, power output of various devices can be

15、measwed. In many applicatiors, potter going into a real load, such as an an- tenna, can be conveniently measured up to frequencies as high as 1000 megacycles with good accuracy. The usual precautions In other transmission line applications, it may be desirable to connect the Model 410A into an exist

16、lng transmission Line. This can be done by cutting the line away so that the center con- ductor of the line is exposed through a hole large enough to clear the body o f the Model 410A probe. The nose of the probe shoulcl be removed. A button-type capacitor of approximately-?Qi micro- microfarads sho

17、uld be fastened to the center conductor of the t-.rc?ns- mission line so that one terminal of the condenser contacts the center conductor of the transmission 39ne and the other terminal of the condenser contacts the anode connection of the probe. A -7- I , close f i t t i n g metal shield OF bushing

18、 should be arranged t o grounfi the outer cylbder of the probe to the outer cocductor of tho transmission line, arc also made on the line, this type of a cmnection 9s likely to cause some increase at higher frequencies in tine standing wave ratlo of the line being measured. frequency is high and whe

19、re good accuracy is required, to mako some compensating adjustments on tho transmission line anC rr,inimizc reflected power from the point of measurement. Unless some impedance matching modifications It is desirable, where the If two general precautions are kept in mfnd when using the i%xiel LClOA,

20、very satisfactory accuracy w i l l be obtained over the entire rated frequency range of the instrument. precaution to make sure that the outer shell of the probe is w d . 1 grounded at the point from which a measurement is desired, connect the voltmeter into the circuit so that the distance fron the

21、 anode connection on the diode to the point a t which. the volt- age is to be measured is as short as possible. First, take every Scccr desirable to check the accuracy of calibration o f the in.strumcr,t 2nd also the change in calibration caused by line voltage variations. Adjustments are provide6 i

22、n the instrument for correction of calibration changes which Ray arise owing t o the variation of a replacement tube from its average typo characteristic. Beplacing tubes V4, Vs, and V6 may cause a shift in the line voltage characteristics of the fnstrument, Hence, if any of these tubes are chanred

23、it is desirable to connect the Model- bl0A to the power line through an adjustable autotransforcier monitored by an ac voltmeter. After the new tube has heated for 15 minutes or more, adjust the autotransformer for a 13.5-voit line voltage. The leads shorted together. A l l o w throe or four minutes

24、 for the instrument to stabilize and then zero-set the meter with the ZE30 ADJ control. Next, set the lfne voltage t o 305 and 125 volts respectively, allowing three or fcxxr minutes at each. set- ting. If the zero reading changes mom than under some conditions it may be necessary t o select amtker

25、replace- ment tube and to repeat the procedure. , SEIJI;CTOR switch should be In the f or - position with the dc # / I located behind the upper right: side of the instrument cabiriel-,.) Also, when amplifier tubes V4, V$, or P6, are repTaced, the calibration o f the instrimerit should be checked by

26、Tneasn- ing standard or accuPately-known sources o f one volc dc with tfie instrument properly zeroed. is not within 3$ of full scale, adjust potentiometer R35 (marked rr4rr on terxinal hoard) until an accuracy of better than 3% is obtained. A f t e r calibrating the one-volt range, check the C a l

27、i - bration o f the otheT dc ranges by neusuring accurately-know- c v standard d.c voltage sources. It may be necessary to readjust R35 to obtain an overall. accuracy of 3% for all dc ranges. If the reading o f the Node1 43.5.A Diodes VI and V2 shonld be replaced as matched pairs. the tubes have bee

28、n replaced, it is desirable to check the Zfrie voltage effects on ac readings and also to check the adjustment of the diode balancing circuit, Line voltage checks should be made as before except that the SELECTOR switch should be set oc AC. If necessary adjust 215 (marked rt5tr on terminal boarci) f

29、or mininun 1-ine voltage variations. When Wext, adjust R1b so that no difference in the zero restding is discernible when changing the SELETOR swS.t;eh from ths two dc positions t o the AC postion* with the RkNGE switch 0 x 1 - Iv, k hole is provided at the rear of the cabinet in order to allow acce

30、ss to H1k. R1b is tn a high impedance circuit, so tixt touching it with a screwdriver causes a cliange in the meter settlng, Therefore, it I s necessary t o adjust the ccmtrof slightly and then rernoe t h e screwdrfver before o5servLng the effect on the meter, If dlodes V1 and V2 are change6 a d pot

31、entlometer R3.b thus adjusted, it is desirable t o check tke calibration o f the ac ranges of the instnmient: If necessary, zero the meter and calibrate the full. scale reading by mans of I 3 2 4 ( l T 1 on termixial board) for the lvAC range, R25 (Ir2 on terminal board) Tor the 3vAC range, and R26

32、(3 on terminal board) for the best ovmaf.1 accuracy of the 10, 30, 100, aEd 300. vAC ranges. The higher ac ranges seldom require Pmther adjustment, but if necessayy the fixed resistors R25, R28, and R48 can be replaced with the va?-:;cs necessary t o correct the calibration of the 30 to 300vAC range

33、s respectively. * * From tZme to time it may be found desirable to ajust Rl.4 as above, even if no tubes m e changed. adjustment of H1k is that the meter pointer should have the same zero reading when the SELECTOR switch is switchod from - t o 0. to AC (on a l l ranges) , o f Procedure for Measuring

34、 AC Voltages. f? The criterion for Also see note on page I+ a? end The Model 410A is a peabreading type voltmeter and is SO designed that it measures the positfve peak value of the applied voltage. T h i s propesty allows tho 1loCit.f 413A to be vided the reading obtainec! is multiplied by tlie fact

35、or . used t o measure the positive voltage rise in a pulse, pro- where tl is the duration of the posi.tu3.vc portion of tho voltage, t2 3.s the duratd-on of? the negative portioii of the voltage, K i s a factor which i$ a Punct-ion of the source impedance of the pulse gemrator anti of ti, PRF is th3

36、 pul.se repetition frequency in pulses per second. In general if the pulse repetition frequency 1s greater than approximately 400 or 509 pps, the above factor reduces to K can be found by use of the cuwcs on tho next page when the Impedance of the pulse generator Ro in k11,ahms and tha duration of t

37、he positive portion of the pulse ti in micro- seconds are kn07m. pulse o f 1 microsecond and a PRF o f ICQO, and assumin? R = 2 kilohms, Ro/tI -2, K = LY.1 and ths mltiplying factor m l d thcn be 1 . 4 (1 + 11999 + 15.l/lOQ) For the case of a 1 microsecond negahfve pulse m a a PRF of 1000, tl would

38、equai 9 9 microseconds and t2 tould equal 2 microsecond, Thus Ro/Z woulld he npproximstely 0 and therefore (from cmvesj K would also be approximately 0, The multiplying faktor would then be 1/4. (3, 4- % 9 / 1 ) . Bellcc, it, may bo seen that in the case of negative pulses of short duration, much sm

39、alley meter readings w i l l be obtained. than for an equivalent positive pulse, and unless the pulse voltage 3.s large, these measurements may be Lmpracttcal. For exanylo, in *the case of a posthive , / r I / 0 / LIST OF COMPONENTS c Circuit I Ref. I Description Capacitor: silver mica; ,0026 r d ;

40、molded in nose of probe; for replaccment order Hewlett-Packmd ptrrt 4Zn-84 Cfipacitor: silver mica; 500 mmf; part of rf probe 42A-25 Capacitor: paper; . 0 3 . mf, 600 vdcw Capacitor: paper; .OL mf, 600 vdcw Capacitor: paper; 1 mf, 600 vdcw Capacitor: mica; .005 mf, 500 vdcw Capacitor: mica; .005 mf,

41、 500 odmr Capacitor: mica; 500 manf, 500 v d c Capacitor: mica; .005 mf, 500 vdcw Capacitor: dca; 560 mnf, 500 vdctt Capacitor: nica; .OW5 nf, 500 vdctr Capacitor: T3ica; ,005 I T ! ! , 500 vdcw Capacitor: clectroly-tic; 50 mf; 5 0 V C W hpacitor: micq 003 mf, ,500 vdcw Fuse: 3AG size cartridge type

42、; 1 ampere rating PUot Imp: min bay base; 22 negob; 1 w a t t Resistor: composition; 22 megohms; 8 watt Resistor: preciston composition type; 0 . 1 megohm Resistor: precision composition type; 216.3K ohms Resistor: precision composition type; 6 8 3 . 7 K ohms Resistor: precision composition type; 2

43、. 1 6 3 megohm - h P Stock No. 17-2 14-5000 14-500 211-47 + 112-15 24-22 23-22yi 3l-LOOK 31-683 .? Aerovox: 684 Aerovox: 684 General Elec : 23 467103 Micamold: t m e J ICW-Qlt! : type id Micmold: om P.ficCmold : t p e Sangamo: type J Micamold: OXM YAcarnoLd : type 7.l lialirf : TC-3 9 Micnmld: Type

44、k! Littelfuse : 1040 GE: 4 7 I -13- I I ,Resiatr: precision cmprssitian type; Circuit -hp- Ref . Description - Stock T b . t Renistor: precielan compositim type; 21.63 megohms; 1 w a t t ,Resistor: precision cmpwIt5on type; _- Wr. and Type No. ! Wilkor: CP-1 W i l k m CP-I i ?ilkor: c3?-2 Wilkw: m-1

45、 I i i i ! i Wilkar: C?-1 t Wilkw: CP-1 i I I f- 1 Allen-Bmdley: i;tR 1 Allen-Bradley: E 3 ATlen-Brafley: HE t Allen-Bradleg: G F 3 1 1 Allen-Bmd3.ey: G!3 1 t i Allen-Bra 1 watt; value selectea during fqctory adJu8tment I Resistor: cmp=sitim; 4.7 rneghnm; 7 w a t t iesistor: cgmpcmit5.m; 5.G megahm;

46、 5 watt ReBfstor: cqmitian; 5.6 xnegahm; 3 watt Resiatm: cmpQsitim; 10,000 dzn.8; 2 watts Patentimeter: wirewma; 2000 Resisbr: compmifyicm; 10,000 3hms, 2 watts %tentimeter: wireworn&; 3000 ohnm Patentimetor: wirewmnd; 23000 ohms Resistc: preclsim campositicm type; 9 megohms Resfstor: preclsim canpo

47、sition type; 0.9 rneg 90,oco hme Resistor: composition; 90 L watt Resistor: Wiirewouncl; 9 . 3 dum P3tentiameter: wirewmnd; 3 dm8 Reeistor: canpsition; 200 dxw; 1 w a t t This reference n3t aaaigned Resistm: ccmpcxWtim; 1 watt; value selected duriw factam calibrsticm -hp- Stock No. 23-5. 220 ohms, 2

48、4-220 1 w a t t i I 1 Manurac twer Description I 26*20 Resistor: wirewound; 3/4 meg- ohms, 2 watts I I .t 10% Switch:rotary; 3 sections, flve I position; ceramfc insulatfcfn I Range Switch Assembly: 7 sections 7 position rotary switch with and R37 to R4.3 mounted thereon ! Switch: toggle: SPST (part of S2) i Power transformer 1910-22 f V2 as a matched pair I Tube: RXA type SY3GT/G Tube: RMIA type 6SN7GT 212-6SNTGT 1 Tube: RMA type 6AG7 1212-6AG7 Tube Socket: standard acta$; molded nica filled phenolic I 38-22 A1 1 e n 4 r ad1 e y GI3 CL