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Figure 5.3 Solder Switch Locations
Solder switch F is used for reference input impedance ratio.
Refer to Section 4 for more information.
6.0 CALIBRATION
This unit was factory-calibrated with a precision voltage source. Frequent
calibration is not necessary due to the stability and internal accuracy. If calibration
is needed, use the following procedure.
1. Remove the front lens. Insert a blade screwdriver under the notch at the
bottom of the lens and gently pry it off.
2. Short the input signal connections and verify that the display reads zero.
3. Apply an input voltage equal to 95% of the high end of the range selected.
4. At the front panel, adjust the Span potentiometer (shown in Figure 3.2) until
the display reads 19000 ±1 count.