TM 9-6695-274-14
Figure 1-34. Hewlett-Packard, Model 745A OPTION C93, Ac Calibrator Standard,
and Hewlett-Packard, Model 746A, High Voltage Amplifier.
Hewlett-Packard, Model 745A OPTION C93, Ac Calibrator Standard (fig. 1-34- is a compact, wide-range ac calibration
standard. The instrument provides highly accurate ac calibration voltages from 0.1 mV rms to 110 V rms. Output
frequency is continuously adjustable from 10 Hz to 110 kHz in four overlapping decade ranges. Output voltage is selectable
in six decade ranges (1 mV through 100 V). A seventh range (1000 V ext.) is provided for use with the external high
voltage amplifier. Output voltage can be varied from 10 percent of range to 100 percent of range in steps as small as I ppm
of range. The six back-lighted voltage set controls provide a direct r readout of the voltage setting. In addition, model 745A
OPTION C93 is equipped with an error measurement function which can be used to provide a direct reading of calibration
errors in percent of setting. Hewlett-Packard, Model
746A, High Voltage Amplifier, increases the output of model
745A OPTION C93 to 11I00 V.
1-62