Chapter 3: Testing Performance
Offset Performance Test
3–10
18
Change the channel 1 offset value to -120 mV.
19 Set the Aux Out voltage to -120 mV.
20 Press the Clear Display key on the scope, wait for the #Avgs value (top left corner of
screen) to return to 256 and then record the DMM voltage reading as V
DMM-
and the
scope Vavg reading as V
Scope-
in the Offset Gain Test section of the Performance Test
Record.
21 Calculate the offset gain using the following expression and record this value in the
Offset Gain Test section of the Performance Test Record:
22 Repeat steps 15 to 21 for the remaining channel 1 vertical sensitivities in the Offset
Gain Test section of the Performance Test Record. For each measurement, set both
the Aux Out voltage (V
Aux Out
) and the Channel offset voltage to the positive V
Aux Out
value and then to the negative V
Aux Out
value in the "V
Aux Out
Setting" column of the
Offset Gain Test table in the Performance Test Record for each of the vertical
sensitivities.
23 Move the Tee connector to the next channel input and repeat steps 14 to 22 for the
channels 2 to 4.
Offset Gain =
∆V
out
∆V
in
--------------
=
V
scope+
– V
scope-
V
DMM+
– V
DMM-
--------------------------------------------
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