Keysight Technologies Infiniium 90000A Series, Service Manual

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26 90000 A-Series Service Guide
3
Testing Performance
3
Configure the oscilloscope to measure the average voltage on the channel
under test as follows:
a
Make sure the channel under test is enabled.
b
Click Setup > Acquisition... . In the Acquisition dialog box, enable averaging and
set # of Averages to 256.
c
Change the vertical scale to 5 mV/div.
d
Set the offset value of the channel under test to 400 mV.
e
Drag and drop the Average voltage measurement icon onto the waveform.
4
Set the Aux Out voltage (V
Aux Out
) to +400.0 mV as follows:
a
Click Utilities > Calibration Output... .
b
Change the Signal Output function to DC.
5
Set the Level to 400.0 mV.
6
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 Offset Accuracy—Offset Gain Test section
of the Performance Test Record.
7
Change the offset value of the channel under test to -400.0 mV.
8
Set the Aux Out voltage to -400.0 mV.
9
Change the vertical scale to 10 mV/div.
10
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 Offset Accuracy—Offset Gain Test section
of the Performance Test Record.
11
Change the offset value of the channel under test to 0 mV.
12
Set the Cal Out voltage to 0 mV.
13
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
DMM0
and the
scope V avg reading as V
Scope0
in the Offset Accuracy—Offset Gain Test section
of the Performance Test Record.