Fluke 803b Analog multimeter
Manufacturer:
Model:
803b
Date:
1962
Category:
Group:
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.

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Service and User Manual
Manual type:
Service and User Manual
Pages:
54
Size:
6.63 Mbytes (6947503 Bytes)
Language:
english
Revision:
Manual ID:
Date:
20 October 1962
Quality:
Scanned document, all readable.
Upload date:
28 January 2016
MD5:
71c4abd72a0640a3fc7dad9648d3554d
Downloads:
485

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

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