JRL Julie Research Labs VDR1067 VDR307 Kelvin Varley Voltage Divider Operator Manual free download

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INSTRUCTIONS FOR USE OF PRIMARY STANDARD VOLTAGE DIVIDER VDR-106/? and VDR-307 This instruction manual applies to the other Julie Kelvin-Varley Dividers except for impedance level, specific ratios or other special modifications (such as \lDR-307 H, VDR-327 J, VDR-327 P). For these special dividers, the individual specification sheet will be an addendum to this instruction manual. INDEX SECTION TITLE PAGE I. Description vDR-106/? I VDR_307 2 II. Specifications III. Connections IV. Applications A, Resistance Measurement 5 B. Voltage Measurement 7 C. Currenr Measurement I D. Operation as a Voltage Divider IO V. Calibration IO \,T, Maintenance 11 VII. Precision - Vol. IV No. I 12 VIII. N. B. S. Letter l:l I. DESCRIPTION The VDR-106/7 is a precision voltage divider of the Kelvin-Varley type. The two major characteristics of this instrument are a) a constant input impedance of 100 kohms and b) an output voltage that is a decimal part of the input voltage as indicated by the settings of the seven decade dials of the divider. A ratio of output to input voltage of unity is indicated by dial settings of 9-9-9-9-9-9-10. The output indication has maximum accuracy under circuit conditions which al1ow no current to pass through the output terminal of the circuit. Leakage is held to such a small value that it does not appreciablv affect the accuracy of the device. Two buttrns are provided for the protection of the divider and the equipment under test (such as standard celts). The "Io sensitivity" key inserts a i meg resistor in the output circuit and the I'high sensitivity" key inserts a I/l}A|n amp instrument fuse in the output circuit (its resistance being about 100 ohms which has negligible effect on the circuit)- A RATIO switch, when set in '?DIAL" position connects the output terminal to the switching circuit of the divider. When set to rrltr. the output tcrminal is connected to the input high terminal. When set to ttgtt, th output terminal is connected to the input low terminal. The use of the rtor! and rlrr positions i', standardization procedures will be discussed subsequently. 3?n T)a .a