Equipment information:

Fluke 803b Analog multimeter
Manufacturer:
Fluke
Model: 803b
Date: 1962
Category: Measurement instruments
Group: Analog multimeter
Description: AC/DC DIFFERENTIAL VOLTMETER
Information:
                                    This instruction manual is for use with the 803B series
AC/DC Differential Voltmeters. These are available in either
a cabinet model or a standard 19 inch rack model, and with
either a standard cell or a Zener diode as the reference
element. Model designations are: 803B (cabinet model,
standard cell); 803BR (rack model, standard cell); 803B/AG
(cabinet model, Zener diode); and 803BR/AG (rack model,
Zener diode).
b. The high accuracy, portability, and compactness of the
803B make this instrument ideal for the precise measurement
of almost any AC or DC voltage. Ease of operation, inherent
protection from accidental overload, and high reliability
contribute to the outstanding performance that assures
suitability for both production line testing and precision
laboratory measurements. This instrument is capable of being
used as a vacuum voltmeter, as a precision potentiometer,
and as a meg- ohmmeter for measurement of high resistance.
It can also be used to measure the excursions of a voltage
about some nominal value. One feature that should be
emphasized is that no current is drawn from the unknown
source for DC measurements when balance is attained. Thus
the determination of the unknown DC potential is independent
of its source resistance. The 803B is basically used for
measurements of DC voltages from 0 to 500 volts and AC
voltages from 0. 001 to 500 volts. However, high accuracy
measurements to 30, 000 volts DC are possible with precision
voltage dividers especially designed for use with the Fluke
Model 800 Series Differential Voltmeters. As additional
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
803B particularly useful for monitoring the stability of
almost any AC or DC voltage. Furthermore, the 803B meter has
taut-band suspension which eliminates problems due to meter
stickiness.
c. When used as a DC Differential Voltmeter, the 803B
operates on the potentiometric principal. An unknown voltage
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 with a standard cell for the 803B and 803BR
and with a Zener power supply for the 803B/AG and 803BR/AG.
The known adjustable re - ference voltage is provided by a
500 volt DC power supply and five Kelvin-Varley decade
resistor strings that are set accurately by five voltage
readout dials. In this way, the 500 volts can be precisely
divided into increments as small as 10 microvolts. The
unknown voltage is then simply read from the voltage dials.
When used as an AC Differential Voltmeter, the 803B operates
essentially the same as for DC differential measurements.
The AC input voltage is converted to a DC voltage and this
DC voltage is measured by comparing it to a known adjustable
reference voltage. In the highest null sensitivity range,
potential differences between the unknown and the reference
voltage of only 0. 01 volts for DC and 0. 001 volts for AC
will cause full scale meter deflection.
d. The instrument is normally supplied ready for use on 115
volts. Upon request, instruments are supplied for 230 volts
operation. If it becomes desirable to convert from one mode
of operation to the other, refer to the instruction decal on
the back of cabinet models or on the cover in rack models.

These manuals are available for the above equipment:

Fluke -- 803b -- Service and User Manual
File name: Fluke-7628-Manual-Page-1-Picture
Manual Type: Service and User Manual
Pages: 54
Size: 6.63 Mbytes (6947503 Bytes)
Language: english
Revision:
Manual-ID/Number:
Date: 20 October 1962
Quality: Scanned document, all readable.
Upload date:
MD5: 71c4abd72a0640a3fc7dad9648d3554d
ed2kID: e9965c425856fb43da88bd461365c243
Downloads: 24 since 28 January 2016
Information:
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 803B 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........................................2-6
2-12. Notes on Measuring AC
Voltages........................................2-7
ΙΠ THEORY OF
OPERATION..........................................................................3-1
3-1.
General.................................................................................3-1
3-2. DC
Attenuator.......................................................................3-2
3-3. Null
Detector.......................................................................3-2
3-4. 500 VDC Reference Power
Supply.....................................3-3
3-5. Kelvin-Varley
Divider........................................................3-3
3-6. AC to DC
Converter..............................................................3-4
3-7. AC - DC Polarity
Switch.....................................................3-5
3-8. Null Detector Power
Supply..............................................3-5
IV
MAINTENANCE..........................................................................................4-1
4-1.
General.................................................................................4-1
4-2. Preventive
Maintenance........................................................4-1
4-3.
Troubleshooting....................................................................4-1
4-4
Calibration..........................................................................4-4
V LIST OF REPLACEABLE
PARTS..............................................................5-1
VI
ACCESSORIES.............................................................................................6-1
6-1. Precision Voltage
Dividers..................................................6-1
6-2. Potentiometrie
Recorder.....................................................6-2
WARRANTY
CIRCUIT DIAGRAM
Fluke-7628-Manual-Page-1-Picture
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