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TM 9-4935-282-34

DEPARTMENT OF THE ARMY TECHNICAL MANUAL

FIELD MAINTENANCE MANUAL

VOLTMETER, ELECTRONIC

JOHN FLUKE MODEL 803D

FSN 6625-072-4303

This copy is a reprint which includes
current pages from Change 1.

HEADQUARTERS, DEPARTMENT OF THE ARMY

MARCH 1964
TM 9-4935-282-34
C1

WARNING

RADIATION HAZARD

This equipment contains the following radioactive items:

Nomenclature FSN Isotope Amount (Microcuries)
OA2 Vacuum tube 5960-503-4880 UO 2 0.10uc
OA2 Vacuum tube 5960-503-4880 Ni63 0.50uc
OA2 Vacuum tube 5960-503-4880 Co60 0.20uc
OG3-2 Vacuum tube 5960-912-7630 Unknown Unknown

Refer to TM 3-261, TM 38-250, and TB 750-237 for information relative to shipping, storage, handling, and disposal of radioactive
material.

FIRST AID FOR RADIOACTIVE CONTACT

The following first aid procedure for wounds caused by anything coated with a radioactive material represents the only reasonable
first aid treatment which would possibly be available.

a. Stimulation of mild bleeding by normal pressure about the wound and by use of suction cups.

WARNING: Do no suck the wound by mouth. The wound must be washed with soap and flushed with plenty of clear
water.

b . If the wound is of the puncture type, or the opening is quite small, an incision should be made to promote free bleeding and to
facilitate cleaning and flushing of the wound.

c. Evacuate patient to a medical facility where monitoring of the wound can be accomplished. All such wounds should be
examined by a medical officer.

d. For wounds involving the extremities, pending medical attention, place a lightly constricting band (tourniquet) 2 to 4 inches
closer to the heart than the site of the wound. The band should be tight enough to halt the flow of blood in superficial blood vessels but
not tight enough to stop the pulse arterial flow).

CLEANING SURFACES ON WHICH TUBES HAVE BEEN BROKEN

Wet Method. Put on rubber or plastic gloves. Pick up large fragments with forceps; then, using a wet cloth, wipe across the area.
Make one wipe at a time and fold cloth in half, using the clean side for wiping each time. When cloth becomes too small, discard and
start again with a clean piece of cloth. Care must be taken not to rub the radioactive particles into the surface being cleaned by using a
back and forth motion. All debris and cloths used for cleaning should be sealed in a container such as a plastic bag, heavy waxed
paper, ice cream carton, or glass jar for disposal.
TM 9-4935-282-34

ERRATA AND ADDENDUM

Model 803D/AC

This manual was intended for use with the 803D AC/DC Differential Voltmeters. The 803D/AC, however, is very nearly electrical
identical to the 803D/AG. Physical and electrical differences include:

1. The Model 803D/AC is mounted in a combination instrument-transit case made of aluminum. This case meets
all environmental requirements of MIL-T-945A.

2. The Model 803D/AC does not have recorder output provisions.

3. Line power input for the Model 803D/AC is by way of an MS3102A-10SL-3P connector on the front panel. A
power input cable with a mating connector (MS3102A-10SL-3S), a three-prong polarized connector, and a three-
prong to two-prong grounded adapter is furnished. Storage space for the input cable is provided in the lid o the
combination case.

4. One set of universal test leads (part no. 699 - Hermin H. Smith, Inc., Brooklyn, New York) is provided with the
Model 803D/AC. These test leads are stored in the lid with the power input cable.

5. Heater resistors R6 and R7 are not used in the Model 803D/AC because the instrument is completely enclosed
by the transit case. However, a Zener oven containing a heater and a thermostat must be used to maintain the
Zener diode reference element at a constant temperature. The Zener diode plugs into the inside of the Zener
oven and the Zener oven plugs into a chassis mounted tube socket.

6. The line fuse is located on the front panel of the 803D/AC.

7. The 803D/AC uses a specially enclosed transformer to prevent leakage at higher operating temperatures.

8. The converter output diodes of the 803D/AC are selected for low leakage to provide for proper operation at the
higher operating temperatures reached within the transit case.

(a)
TM 9-4935-282-34

To create a parts list for the 803D/AC, change the 803D list of replaceable parts as follows:

Delete:

Front Panel Assembly *803D/AG-435
Converter/AC Range Switch Assembly *803D-438
CR501, 502 Diode, silicon, 60 ma RE22
J4, J5 Binding post, red X2231
Binding post insulator, dual, black *801B-830
R1 Resistor, variable wirewound, 10K,
+10%, 2W P10KA
R6, R7 Resistor, wirewound, 6K +5%, 5W R6KW
T1 Transformer, power *803C-651
Line cord, 3 wire X27H
Rubber foot X224
Case Assembly (cabinet model) *803B-271
Handle, flexible black vinyl, 5-1/2"
(cabinet model) 407-101

Add:

Front Panel Assembly *803D/AC-403
Converter/AC Range Switch Assembly *803D/AC-404
CR501, 502 Diode, silicon, 60 ma, 40 PIV (selected
RE22) *803D/AC-402
T1 Transformer, power *821A-651
Case, instrument-transit *803D/AC-271
Connector (mates with line cord) M3102A-10SL-3P
Line cord *803D/AC-401
Test lead set X2322
Tube socket (for Zener oven) X52
Zener diode oven (includes heater and
thermostat) X2259

(b)
TM 9-4935-282-34

To create a schematic diagram for the 803D/AC, change the 803D schematic as follows:

c
TM 9-4935-282-34
803D

Material in this manual is used by permission of

John Fluke Manufacturing Company, Inc.

TABLE OF CONTENTS

Section Title Page

I INTRODUCTION AND SPECIFICATIONS 1-1

1-1. Introduction .......................................................................................... 1-1
1-2. Damage in Shipment ......................................................................... 1-1
1-3. Specifications ....................................................................................... 1-1

II OPERATING INSTRUCTIONS 2-1

2-1. Controls, Terminals, and Indicators ................................................ 2-1
2-2. Zeroing Instructions ........................................................................... 2-3
2-3. Preliminary Operation......................................................................... 2-3
2-4. Operation as a DC Differential Voltmeter ....................................... 2-3
2-5. Operation as an AC Differential Voltmeter ..................................... 2-3
2-6. Operation as a Conventional VTVM................................................. 2-4
2-7. Measurement of Voltage Excursions About
a Nominal Value.............................................................................. 2-4
2-8. Use of 803D with a Recorder............................................................ 2-5
2-9. Measurement of High Resistances .................................................. 2-6
2-10. Notes on Measuring AC or DC Voltages ........................................ 2-6
2-11. Notes on Measuring DC Voltages ................................................... 2-7
2-12. Notes on Measuring AC Voltages .................................................... 2-7

III THEORY OF OPERATION 3-1

3-1. General ................................................................................................ 3-1
3-2. DC Vacuum Tube Voltmeter ............................................................. 3-1
3-3. 0 to 500 Volt Reference Supply ....................................................... 3-3
3-4. AC to DC Converter ............................................................................ 3-4
3-5. AC - DC Polarity Switch...................................................................... 3-4

IV MAINTENANCE 4-1

4-1. General ................................................................................................ 4-1
4-2. Periodic Maintenance ......................................................................... 4-1
4-3. Corrective Maintenance..................................................................... 4-1
4-4. Calibration ............................................................................................ 4-5

V LIST OF REPLACEABLE PARTS 5-1

VI ACCESSORIES 6-1

6-1. Precision Voltage Dividers ................................................................. 6-1
6-2. Potentiometric Recorder ................................................................... 6-2

WARRANTY

CIRCUIT DIAGRAM

i
TM 9-4935-282-34
803D

LIST OF ILLUSTRATIONS

Figure Title Page

Frontispiece Model 803D AC/DC Differential Voltmeter ..................................................... iv

2-1 Controls, Terminals, and Indicators (sheet 1 of 2)......................................... 2-1

2-1 Controls, Terminals, and Indicators (sheet 2 of 2) ........................................ 2-2

2-2 Recommended Null Settings ............................................................................. 2-3

2-3 VTVM Ranges .................................................................................................... 2-4

2-4 Full Scale AC Deflections .................................................................................. 2-5

2-5 Recorder Recommended Connection Diagram ............................................ 2-5

2-6 Percent Error Due to Harmonic Distortion ..................................................... 2-7

2-7 Signal Voltage with Converter Noise ............................................................... 2-8

3-1 803D AC/DC Differential Voltmeter Block Diagram ....................................... 3-1

3-2 Function of Polarity Switch................................................................................. 3-5

4-1 Troubleshooting (sheet 1 of 2) .......................................................................... 4-2

4-1 Troubleshooting (sheet 2 of 2) ......................................................................... 4-3

4-2 Tube Voltage Chart ............................................................................................ 4-4

4-3 Calibration Equipment ....................................................................................... 4-5

4-4 Adjustment Locations ......................................................................................... 4-6

4-5 AC to DC Converter Calibration Set-up........................................................... 4-7

5-1 Final Assembly (sheet 1 of 2)............................................................................ 5-3

5-1 Final Assembly (sheet 2 of 2)............................................................................ 5-4

5-2 Front Panel Assembly (sheet 1 of 2) ............................................................... 5-6

5-2 Front Panel Assembly (sheet 2 of 2) ............................................................... 5-7

5-3 Reference Supply Board Assembly ................................................................. 5-9

5-4 Null Detector Chassis Assembly....................................................................... 5-12

5-5 Range Resistor Board Assembly...................................................................... 5-14

5-6 Kelvin-Varley Resis tor Board Assembly ......................................................... 5-15

5-7 Converter/AC Range Switch Assembly (sheet 1 of 2) ................................. 5-18

5-7 Converter/AC Range Switch Assembly (sheet 2 of 2) ................................. 5-19

5-8 Chopper Drive Assembly .................................................................................. 5-20

iii
TM 9-4935-282-34

iv
TM 9-4935-282-34
803D

SECTION I

INTRODUCTION AND SPECIFICATIONS

1-1. INTRODUCTION with a standard cell for the 803D and 803DR and with a Zener
reference diode for the 803D/AG and 803DR/AG. The known
a. This instruction manual is for use with the 803D series adjustable reference voltage is provided by a 500 volt DC
AC/DC Differential Voltmeters. These are available in either a power supply and five Kelvin-Varley decade resistor strings
cabinet model or a standard 19 inch rack model, and with that are set accurately by five voltage readout dials. In this
either a standard cell or a Zener diode as the reference way, the 500 volts can be precisely divided into increments as
element. Model designations are: 803D (cabinet model, small as 10 microvolts. The unknown voltage is then simply
standard cell); 803DR rack model, standard cell); 803D/AG read from the voltage dials. When used as an AC differential
(cabinet model, Zener diode); and 803DR/AG (rack model, voltmeter, the 803D operates essentially the same as for DC
Zener diode). differential measurements. The AC input voltage is converted
b. The high accuracy, portability, and compactness of to a DC voltage and this DC voltage is measured by comparing
the 803D make this instrument ideal for the precise it to a known adjustable reference voltage. In the highest
measurement of almost any AC or DC voltage. Ease recommended null sensitivity range, potential differences
operation, inherent protection from accidental overload, and between the unknown and the reference voltage of only 0.001
high reliability contribute to the outstanding performance that volts for DC and 0.001 volts for AC will cause full scale meter
assures suitability for both production line testing and precision deflection.
laboratory measurements. This instrument is capable of being d. The instrument is normally supplied ready for use on
used as a vacuum tube voltmeter, as a precision 115 volts. Upon request, instruments are supplied for 230
potentiometer, and as a megohmmeter for measurement of volts operation. If it becomes desirable to convert from one
high resistance. It can also be used to measure the excursions mode of operation to the other, refer to the instruction decal on
of a voltage about some nominal value. One feature that the back of cabinet models or on the cover in rack models.
should be emphasized is that no current is drawn from the
unknown source for DC measurements when balance is 1-2. DAMAGE IN SHIPMENT
attained. Thus the determination of the unknown DC potential
is independent of its source resistance. The 803D is basically Immediately upon receipt, thoroughly inspect for any damage
used for measurements of DC voltages from 0 to 500 volts and that may have occurred in transit. If any damage is noted,
AC voltages from 0.001 to 500 volts. However, high accuracy follow the instructions outlined on the warranty page at the
measurements to 30,000 volts DC are possible with precision back of this manual.
voltage dividers especially designed for use with the Fluke
Model 800 Series Differential Voltmeters. As additional 1-3. SPECIFICATIONS
features, this instrument contains a polarity switch for equal
convenience in measuring positive or negative DC voltages
and an adjustable recorder output which makes the 803D AS A PRECISION POTENTIOMETER
particularly useful for monitoring the stability of almost any AC
or DC voltage. Furthermore, the 803D meter has taut-band DC ACCURACY:
suspension which eliminates problems due to meter stickiness.
c. When used as a DC differential voltmeter, the 803D +0.02% of input voltage from 0.1 to 500 VDC
operates on the potentiometric principal. An unknown voltage +(0.02% +25 uv) below 0.1 VDC
is measured by comparing it to a known adjustable reference
voltage with the aid of a null detector. An accurate standard
for measurements is obtained by setting the reference supply

1-1
TM 9-4935-282-34
803D

AC ACCURACY:

Input Basic AC Accuracy Low Frequency AC Accuracy High Frequency AC Accuracy
Voltage
30 cps to 5 kc 20cps to 10kc 10cps to 20cps 5cps to 10cps 10kc to 20 kc 20 kc to 100 kc

0.5 to 500 +0.1% +0.15% +0.5% +2% +0.3% -

0.001 to 0.5 +(0.1% + 25uv) +(0.15% + 25uv) +(0.5%+25uv) +(2% + 25uv) +(0.3% + 25uv) -

0.05 to 50 - - - - - +1%

RANGE: RESOLUTION:

For DC Measurements Voltage Readout Dial Resolution

Input Resistance Range Null
Input Recommended Per Volt of Input Voltage Setting Setting Resolution
Voltage Null
Range Range At 1% of Full 500 any 10 mv
Null Scale Off Null 50 any 1 mv
5 any 0.1 mv
50-500 10-0-10 Infinite 100 Meg 0.5 any 0.01 mv
1-0-1 Infinite 1,000 Meg
5-50 1-0-1 Infinite 1,000 Meg
0.1-0-0.1 Infinite 10,000 Meg
0.5-5 0.1-0-0.1 Infinite 10,000 Meg
0.01-0-0.01 Infinite 100,000 Meg
0-0.5 0.01-0-0.01 Infinite 100,000 Meg
0.001-0-0.001 Infinite 100,000 Meg

Meter Resolution
(1/4 of a small scale meter division)
For AC Measurements Polarity Range Null Resolution
Setting Setting Setting
Input Recommended
Voltage Null Input DC any 10 50 mv
Range Range Impedance DC any 1 5 mv
DC any 0.1 0.5 mv
50-500 100-0-100 1 Meg, 35 uuf DC any 0.01 0.05 mv
10-0-10 1 Meg, 35 uuf DC any 0.001 0.005 mv
1-0-1 1 Meg, 35 uuf
AC 500 1 500 mv
5-50 10-0-10 1.1 Meg, 35 uuf AC 500 0.1 50 mv
1-0-1 1.1 Meg, 35 uuf AC 50 1 50 mv
0.1-0-0.1 1.1 Meg, 35 uuf AC 500 0.01 5 mv
AC 50 0.1 5 mv
0.5-5 1-0-1 1 Meg, 50 uuf AC 5 1 5 mv
0.1-0-0.1 1 Meg, 50 uuf AC 50 0.01 0.5 mv
0.01-0-0.01 1 Meg, 50 uuf AC 5 0.1 0.5 mv
AC 0.5 1 0.5 mv
0.001-0.5 0.1-0-0.1 1 Meg, 50 uuf AC 5 0.01 0.05 mv
0.01-0-0.01 1 Meg, 50 uuf AC 0.5 0.1 0.05 mv
0.001-0-0.001 1 Meg, 50 uuf AC 0.5 0.01 0.005 mv

1-2
TM 9-4935-282-34
803D

AS A VACUUM TUBE VOLTMETER GENERAL SPECIFICATIONS

ACCURACY: 3% of full scale REGULATION AND STABILITY OF 500 VOLT SUPPLY:
+0.0025% for a