Keysight 9000 Series Service Manual page 32

Chapter 3: Testing Performance
DC Gain Accuracy Test
e When the Enter Measurement Info window appears, ensure that the V avg function is set up as
follows and then click OK:
Source = Channel 1
Measurement Area = Entire Display
5 Press [Clear Display] on the scope, wait for the #Avgs value (top left corner of screen) to return to 256
and then record the scope's mean V avg reading in the Vscope+ column in the Offset Accuracy Test (50
Ω) section of the Performance Test Record.
Notes
• For all scope readings in this procedure, use the mean value in the Measurements display area at the
• If a question mark appears in front of any of the values at the bottom of the screen, press [Clear
Record the
mean reading
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bottom of the screen.
Display] on the scope, wait for the #Avgs value to return to 256 and then record the scope reading.
The question mark indicates that the oscilloscope could not make a reliable measurement. Therefore,
any results that contain a question mark should be considered suspect and you should follow the
directions above.