TM 9-6695-274-14
Figure 1-29. Biddle, Model 71-650, Calibration Resistance Standard.
Biddle, Model 71-650, Calibration Resistance Standard is a wide range decade resistance box of very high accuracy. It is
used as a calibration standard in applications where a variety of exact resistance values of high resolution and stability are
needed. The variable resistor dials consist of eight step switches and a precision slidewire. The two lowest significant
figures are read on the slidewire dial. All dials may be rotated continuously 360 degrees in either direction. The set
resistance value, of up to ten significant figures, is a digital display, with decimal point, which reduces error in reading
resistance values. The resistance standard is housed in a dust-tight metal chassis, with metal panel, which provides
complete electrostatic shielding.
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