Specifications

Chapter 3: Testing Performance
Offset Accuracy Test
24
7 Change the channel 1 offset value to - 400.0 mV.
8 Set the Cal Out voltage to - 400.0 mV.
9 Press [Clear Display] 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.
10 Change the channel 1 offset value to 0 mV.
11 Set the Cal Out voltage to 0 mV.
12 Press [Clear Display] 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
DMM0
and the scope
Vavg reading as V
Scope0
in the Offset Gain Test section of the Performance Test Record.
13 Calculate the offset gain error using the following expressions and record the value in
the Offset Gain Test section of the Performance Test Record. The offset gain error is
the greater (maximum magnitude) of either:
or
14 Repeat steps 4 to 13 for the remaining channel 1 vertical scale settings in the Offset
Gain Test section of the Performance Test Record. For each measurement, set both the
Cal Out voltage (V
Cal Out
) and the Channel offset voltage to the positive V
Cal Out
value
and then to the negative V
Cal Out
value in the "V
Cal Out
Setting" column of the Offset
Gain Test table in the Performance Test Record for each of the vertical scale settings.
15 Move the Tee connector to the next channel input and repeat steps 4 to 13 for channels
2 to 4.
V
scope+
– V
scope0
V
DMM+
– V
DMM0
------------------------------------------
1–


100
V
scope-
– V
scope0
V
DMM-
– V
DMM0
-----------------------------------------
1–


100