HP 400E Operating And Service Manual
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HP 400E Operating And Service Manual

Ac voltmeter
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  • Page 2 Verso Filler Page...
  • Page 3 To help minimize the possibility of electdcal fire or shock hazards, do not expose this instrument to rain or excess moisture. 00400-900 2 0 -hp- Manual Part No. 00400- 90 06 7 Microfiche Part No. ©Copyright Hewlett-Packard Company 1966 P.O. Box 301, Loveland, Colorado 80537 U.S.A.
  • Page 4 For warranty service or repair, this product must be returned to a service facility designated by -hp-. Buyer shall prepay shipping charges to -hp- and -hp- shall pay shipping charges to return the product to Buyer. However, Buyer shall pay all shipping charges, duties, and taxes for products returned to -hp- from another country.

  • Page 5: Table Of Contents

    Operuting Instructions ..VI. REPLACEABLE PARTS 3-6. Stundud 400E/EL Introduction 3-7. 6-1..6-1 400E With Option 0 I ..Ordering Informution 3-12. 3 -4 .. 6-1 400E/EL With Option 02 Non-Listed Purts ..3-14.

  • Page 6: Table Of Contents

    LIST OF ILLUS TRATIONS Figure Page I-I. Models 400E and 400EL AC Voltmeters . . I-I 2-1 . Power Cords ....2-1 3-2.
  • Page 7 SAFETY SUMMARY The following general safety precautions must be observed during all phases of operation, service, and repair of this instrument. Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards of design, manufacture, and intended use of the instrument. Hewlett·Packard Company assumes no liability for the customer's failure to comply with these requirements.
  • Page 8 AC-DC Converter Output: 1 Vdc output for full Dimensions: 6-1/2 in. high, 5-1/8 in wide. scale meter deflection (linear output for Model 400E/EL). deep (165, 130,2 x 279,4 mm). Models 400E/400E L Accuracy: (% of full scale % of Reading) ± Frequency 4 MHz...

  • Page 9: Identification

    Model 400EL is primarily measurements. a dB meter. However, both meters indicate both volts and dB. The 400E has a linear ac scale with a 1 -9. I N S T R U M E N T...
  • Page 10 Section I Models 400E/400EL Table 1-2. Performance Characteristics Maximum Overload: AC sinewave voltages input to the 1 mV through 1 V ranges must not exceed the values shown: 500 f--- .>< ..J > FREQUENCY (Hz) 400 - 8· 3889 sinewaves input...

  • Page 11: Installation

    SECTION II INSTALLATION 2-1. INTRODUCTION. 2-2. This section contains information and instruc­ tions necessary for the installation and shipping of the Model 400E and 400EL Voltmeters. Included arc initial inspection procedures, power and grounding requirements, installation information, and instruc­ 8120-0696 8120-1692 8120-1103 tions for repackaging for shipment.
  • Page 12 2-15. INSTRUMENT CASE. NOTE If the instrument is to be shipped to Hewlett­ 2-16. The 400E/EL can be placed in a rugged, high impact plastic case (-hp- 11076A). TJ-le instrument Packard for service or repair, attach a tag to the instrument identifying the owner and indicating can be operated, stored or carried in thi.;...

  • Page 13: Introduction

    Paragraph 5-5. 3-5. Figure 3-2 shows the location of each of the 400E/EL controls and explains the function of each. To operate the ModeI400E/EL with battery power, connect two 35 to 55 volt batteries 3-6.

  • Page 15: External Battery Connection

    If the scale reading is + .5 and the RANGE is -30dB, the final measurement is -28.SdB. b. The 400E/EL dB scale is calibrated in dBm. OdBm is equivalent to milliwatt dissipated by a 600 ohm load. Consequently, any dBm...

  • Page 16: E/El With Option 02

    105mV. On essentially the same as o peratio n of the standard all other ranges, the maximum output is 400E' The dB scale reads from -15 to +2 instead of 150m Table 3-2 shows the ac amplifier t op of the scale �lnci j"...

  • Page 17: Simplified Block Diagram

    Section I V Models 400E/400EL SECTION IV THEORY OF OPERATION 4-1. GENERAL. Attenuator is switched back to the 30dB position, and then it attenuates lOdB per step on the higher ranges. Variable capacitor S2C2 is adjusted on the 4 - 2. The...

  • Page 18: Meter Bridge

    Section IV Models 400E/400EL • ••••• � CURRENT DURING NEG HALF CYCLE. • • •••• • • • · · +26V 1 � . . - • · · A2R52 METER �A2C35 AMPL FROM • POST · · ATTEN ·...

  • Page 19: Ac Output Circuit

    Models 400E/400EL Section IV A2CR 16 into the amplifier, part goes 4-14. The output from the collector of A2QI3 is coupled through the Meter Bridge and fed back to the through A2R53 and the meter to ground. The current emitter of A2Q9. A2C28 in the feedback circuit...
  • Page 20 Verso Filler Page...
  • Page 21 WARNING Maintenance described herein performed with power supplied to the instrument, and pro­ tective covers removed. Such maintenance should be performed only by service- trained personnel who are aware of the hazards in­ volved (for example, fire and electrical shock). Where maintenance can be performed without power applied, the power should be removed.

  • Page 22: Required Test Equipment

    Voltage Accuracy: ± .25% a t 400Hz Calibrator Output: 0 to 3 volts Calibrator Termination Feed-through, 50 ohm impedance -hp- Model I I 048C 50 ohm Feed-through Termination dB attenuation 0.01 dB de to 10 MHz Weinschel Engineering Coaxial ±...
  • Page 23 These procedures can be used both for incoming warmup for at least one-half hour. inspection and periodic inspection. The performance a. Place the 400E/EL on the 3 volt range and checks should be conducted before any attempt is position the 745A to read 3.00000 volts at made to calibrate the instrument.

  • Page 26: Calibration Tolerances

    Models 400E/400EL Section Y M ULTI-FUNTION METER hp3450A LIIJ D=:! LIIJ D=:! !l oOD=:! DC DIFFERENTIAL DC NULL VOLTMETE R/D C STANDARD 400ElEL VOLTMETER 740B AC VOLTMETER 419A '-t:9 � O-IOMV REFERENCE SUPPLY r---- OC OUTPUT - �------ - �- ON REAR �...

  • Page 27: Calibration Accuracy Graphs

    Models 400E/400EL Section ±(I! 4 F. S. + 1/4% READING ) ±(I%F.S.+ 1% READING ) <t -1.5 :>l! � F.S. <t ±(O.4 %F.s.+o.r% READING) <t ' . . . / ±(1.5% F.S. + 1.5%READING) :>l! -1.5 F.S. ±(1/2% F.S. + 1/2% READING) _______ <t...
  • Page 28 5-21 . The range tracking test checks the accuracy of 5-19. Check the 400E/EL accuracy and frequency the 400E/EL with a 1 /3 scale input over its entire response on the 3 volt and 1 volt ranges according to frequency range.
  • Page 29 Connect a precision coaxial 50dB attenuator THERMAL CONVERTER. between the BNC "T" and the 400E/EL INPUT. c. Set the 400E/EL RANGE switch to 3 millivolts ( .003 volts) and the oscillator to h. Using the oscillator amplitude control 10Hz. Connect a precision 40dB coaxial coarse adjustment and resistor R4 (Figure attenuator between the BNC "T"...
  • Page 30 Section V Models 400E/400EL i. Repeat step h for each frequency listed in d. Repeat steps a and b with the 400E/EL on the 1 volt range. Table 5-3. I f the 400E/EL is within specifications, the meter indication and the dc output will be within the tolerances listed e.

  • Page 31: Location Of Internal Adjustments

    Models 400E/4DOEL Section V 5-34. COVE R REMOVAl. e. Place the oscillator and the 400E/EL on the I m V r a n g e. Increase oscillator's amplitude for full scale deflection on the 5-35. To remove the top or bottom covers, remove 400E/EL meter.
  • Page 32 At R4 as fine adjustment, increase the oscillator null, the input to the 400E/EL will be 1 mV output until the thermal converter output at 400Hz. nulls the reference supply.

  • Page 33: Alternate Calibration Procedure

    3 volt range. 300 volts to .3 millivolts. The accuracy of this calibra­ f. Change the 400E/EL to the 100 volt range . tor is 0.2% at 300 volts and 0.3% using the attenua­ Use the tolerances in Table 5-2 for I volt tor.

  • Page 34: Test Setup

    Change the frequency to those in Table 5-2 and readjust the oscillator AMPLITUDE to If the 400E/EL is out of specifications at a 0% or OdB. The 400E/EL dc output should frequency, adjust the component listed in read within the tolerance for that frequency, Table 5-5 for a 400E/EL meter and dc out­...

  • Page 35: Troubleshooting Tips

    A2C I and C20. 5-48. TROUBLESHOOTING. 400E/EL is slightly out of specifications and can not be corrected by the proper adjustment, refer to Table 549. These procedures should only be performed 5-11 Factory Selected Values. If the 400E/EL when the 400E/EL can not be calibrated according to inoperative or completely out of specifications procedures in Paragraphs 5-32 through 547.

  • Page 36: Power Supply Voltages

    *Ca n n o t be measured. 5·52. AIVIP L I F I E RS. Table 5 -9 . Meter Amplifier V oltages 5 -5 3 . Set t h e 400E/EL to volt range, and con n e c t...

  • Page 37: Selected Components

    Model given measured voltage is incorrect, the trouble is 400E/E L are individually selected in order to com­ pensate fo r slightly varying circuit parameters. probably in t h a t component or its associated cir­...
  • Page 38 P E R F O RMAN C E C H E C K T E ST CARD T e s t · h p · Model 400E/E L p e r f o r med b y : D a t e : AC V o l t m e t e r Se r i d l N o .

  • Page 39: Standard Abbreviations

    Models 400E/400EL Section VI SECTIO N V I R E P LACEA B LE PA R T S INTRODUCTION. 6·1. 6-3 . Miscellaneous parts are listed at the end o f Table 6-3 . 6-2. This section contains i n formation for ordering ORDERING INFORMATION.
  • Page 40 Section V I M odels 4OO E/400 EL Tlble 8-2. Code of Mln uflcturers. Mfr. Mo. M.nuf.cturer M.me Address 008 5 3 2 9 6 7 1 S a n g a m o E l e c C o Pickens, S C 0 1 1 2 1 A l l en-Bradley C o...

  • Page 41: Replaceable Parts

    Section VI Models 400E/400EL Table 6-3. Replaceable Parts. REFERENCE -hp- MFR. MFR. PARTNO. DES CRIPTION DESIGNATOR PART NO. 00400·88521 -h p - Board Ass'y:in p ut attenuator 72982 841-000-05 2032 0150-0024 fxd cer 20.000pF +80% -20% 600l/dcw 0121·0168 72982 530· 0 07 C: I/ar 0.25 - 1 .5 pF 600 Vdcw...
  • Page 42 Diode: breakdown 20.5V ±5% 400mW 06486 1902-0182 CR14 Diode: S i breakdown 11.8V ±5% 400mW 06486 1902·3179 Diode: S i 20mA at +1 V 1.5pF -hp- CR15,<:;R16 1901·0347 CR17,CR18 1902-3090 Diode: breakdown 4,99V 04713 SZ10939-94 Diode: breakdown 15V :1:5% loopF 400mW...
  • Page 43 Section VI Models 400E/400EL Table 6-3. Replaceable Parts (Cont'd). REFERENCE MFR. DES CRIPTION MFR. PART NO. DESIGNATOR PART NO. R23,R24 0757-0434 75042 CEA T·O R: fxd prec met flm 3650 ohms ±1% 1/8W 0683·3915 R: fxd comp 390 ohms ±5% 1/4W...
  • Page 45 4OO E /400 E L Models Section Table 6-3. Replaceable Parts (Cont ' d). -hp - REFERENCE MFR. PART NO. DESCRIPTION MFR. DESIGNATOR PART NO. 9 100-1321 -h p - Transformer: line 8120-1348 Assy : cable AC p ower cord set...
  • Page 46 OUTPUT -LINE MP26 1I�/230\1 tlO� 48-440- 10VA MAX 115/230V IZ5mAT @@@@@ @ @@@ «X>El-C-04�4 400E/EL -9-0476 LEFT SIDE VIEW BACK VIEW � Handle inc luded MP18 wit h top cover. Refer to Misc. Page 6·6 for handle kit. M P10...
  • Page 47 Section VI Models 4OO E /400 E L 400E/Ec-a -0490A Figure 6-2. Chassis and Switch Components. 6-9/6-10...
  • Page 48 Verso Filler Page...
  • Page 49 Section VII Models 400E/400EL SECTION VII CIRCUIT DIAGRAMS layout to be used for maintenence and operation of 7-1. INTRODUCTION. EIEL. 7-2. An explanation of terms and symbols used as This section contains schematic diagram, reference designators is given the Schematic Note s.
  • Page 50 400Ej400El Section vn Models A2 Board Component Locations ("6 A� A� 0(> I-f> ,\-: C� AI> Il� 1l.1 £16 " ("5 Ill! 6� 11.1 1I11 11 7 E<, ("4 1>0 £1 7 Ill! C> ("4 2� � --c=:=J- e TP3 '-RZ- - Ru- -CR7-...
  • Page 52 Transf ormer mounting and pin receptacles are different but current parts CHANGE NO.1 should be used. Section Replaceable Parts and Figure 7-1 Schematic Diagram: fxd 30 pF ± 5OJo; -hp- Part Number 0160-0181. Change S2C2 to CHANGE NO.2 Section Replaceable Parts and Figure 7-1 Schematic Diagram:...
  • Page 53 ± Change A2Q5 to -hp- Part Number 1855-0068 and A2R16 to 8 2 kilohms 5%, -hp- Part Number 068 3-8 325. If A2Q5 should be defective, replace both A2Q5 and A2R16 with latest part numbers to reduce noise. CHANGE NO.6 Table 6-1 Replaceable Parts and Figure 7-1 Schematic Change A2R73, R74 to 4.7 kilohms, -hp- Part Number 0683-4725.
  • Page 54 Section VIII Models 400E/400EL CHANGE NO. 10 Table 6-1 Replaceable Parts. Change S3 rear panel switch DPDT 115 V 1230 V to -hp- Part Number 3101-0033. CHANGE NO. 11 Table 6-1: Change A2 Part Number to 00400 - 66501. Change A2C28 to 0130-0016 C : var cer 5-25 pF.
  • Page 55 The AC Calibrator recommended model should be a Fluke 5200A and 5215A. The AC/DC Voltmeter recommended model should be an -hp- Model 3466. The DC Standard recommended model should be a Systron Donner Model M 1 07 A The Voltmeter Calibrator should be deleted from the table.
  • Page 56 Number of the A 1 Assembly from "00400-66521" to "00400-66522" . Tlble5·1. Required Test Equipment should have the follow­ ing changes made: CHANGE NO. &. 400E: Applies to Seriel Numbers 1208A28944 Ind Above. The AC Calibrator recommended model 4{JOEL: Applies to Serill Numbers 1208A29014 Ind should be a Fluke 5200A and 521 SA .
  • Page 57 Model 400E/P MANUAL CHANGES Page 2 of R35/C22/CR12 TO R55 ',lOOK R77" l.21K -26V R40/C39 Figure C·l. Schematic Diagram Changes (Change --R I- -R 2- - R 6 - -CR7- - CRS- -CRZ- - R 4- -C 3 - -CI8-...

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