
Chapter 4: Testing Performance
DC Gain Accuracy Test
64
16
Calculate the offset gains for the 50 W test and the 1 MW test using the following expression
and record this value in the DC Gain Test section of the Performance Test Record.
For the 50 W input impedance version of this test at the 5 mV/div sensitivity, use the
following equation:
All vertical sensitivities for the 1 MW test (including the 5 mV/div setting) and all 50
W test vertical sensitivities except for the 5 mV/div setting should then use the following
equation:
DCGainError =
V
out
V
in
--------------
V
scope+
– V
scope-
V
DMM+
– V
DMM-
----------------------------------------- 1–
0.375=
DCGainError =
V
out
V
in
--------------
V
scope+
– V
scope-
V
DMM+
– V
DMM-
----------------------------------------- 1–
0.75=
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