Agilent Technologies Infiniium 80000 Series Service Manual page 48

Change the channel 1 offset value to -400.0 mV.
18
Set the Aux Out voltage to -400.0 mV.
19
Press the Clear Display key on the scope, wait for the #Avgs value (top left corner of
20
screen) to return to 256 and then record the DMM voltage reading as V
scope Vavg reading as V
Record.
Change the channel 1 offset value to 0 mV.
21
Set the Aux Out voltage to 0 mV.
22
Press the Clear Display key on the scope, wait for the #Avgs value (top left corner of
23
screen) to return to 256 and then record the DMM voltage reading as V
scope Vavg reading as V
Record.
Calculate the offset gain error using the following expressions and record the value in
24
the Offset Gain Test section of the Performance Test Record. The offset gain error is
the greater (maximum magnitude) of either:
Repeat steps 15 to 21 for the remaining channel 1 vertical sensitivities in the Offset
25
Gain Test section of the Performance Test Record. For each measurement, set both
the Aux Out voltage (V
value and then to the negative V
Offset Gain Test table in the Performance Test Record for each of the vertical
sensitivities.
Move the Tee connector to the next channel input and repeat steps 18 to 22 for the
26
channels 2 to 4.
in the Offset Gain Test section of the Performance Test
Scope-
in the Offset Gain Test section of the Performance Test
Scope0
V – V
⎛
scope+ scope0
----------------------------------------- - 1
–
⎝
V – V
DMM+ DMM0
or
V – V
⎛
scope- scope0
---------------------------------------- - 1
–
⎝
V – V
DMM- DMM0
) and the Channel offset voltage to the positive V
Aux Out
value in the "V
Aux Out
Chapter 4: Testing Performance
⎞ 100
⎠
⎞ 100
⎠
Setting" column of the
Aux Out
Offset Accuracy Test
and the
DMM-
and the
DMM0
Aux Out
47