Keysight Technologies Infiniium 90000A Series, Service Manual

Page: 31 / 136

Testing Performance
3
90000 A-Series Service Guide 31
8
Press [Clear Display] on the oscilloscope, wait for the number of averages to
return to 256, and then record the DMM voltage reading as V
DMM-
and the
scope V avg reading as V
Scope-
in the DC Gain Accuracy Test section of the
Performance Test Record.
9
Calculate the DC gain using the following expression and record this value in
the Calculated DC Gain Error column of the DC Gain Accuracy Test section of
the Performance Test Record.
For vertical scale values < 1 V use the following equation:
For vertical scale values = 1 V use the following equation:
10
Repeat steps 3 to 9 for the remaining channel 1 vertical scale settings in the DC
Gain Test section of the Performance Test Record. For each measurement, set
the Aux Out voltage (V
AuxOut
) to the positive V
AuxOut
value and then to the
negative V
AuxOut
value in the “V
AuxOut
Setting” column of the DC Gain Accuracy
Test table in the Performance Test Record for each of the vertical scale
settings.
11
Move the Tee connector to the next channel input and repeat steps 2 to 10 for
channels 2 to 4.
DCGainError =
Δ
V
out
Δ
V
in
--------------- =
V
scope +
– V
scope -
V
DMM +
– V
DMM -
-------------------------------------------- 1 –
 
 
 
75
DCGainError =
Δ
V
out
Δ
V
in
--------------- =
V
scope +
– V
scope -
V
DMM +
– V
DMM -
-------------------------------------------- 1 –



60


