SDS5000XSeries Digital Oscilloscope Service Manual
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5.2
To Verify Offset Accuracy
Offset
Accuracy
Slope
=
LINEST(Offset
error1
:Offset
error5
,
Offset
out1
:Offset
out5
)
Note:
“Offset
out
”
represents DC voltage output level setting;
“Offset
error
”
represents the difference between the output setting
and the measurement.
This test verifies the non-interleaved mode Offset Accuracy of all the
channels.
Steps:
1.
Set the 9500B output to on.
2.
Connect all channels of the oscilloscope to 9500B as shown in
3.
Set the Volts/Div of the channel to 1 mV/div. Press theMeasurebutton
on the front panel of the oscilloscope to display Mean measurement.
4.
According to
, set offset of the channel to -Offset, and set the
9500B output level to equal the offset, then record the mean value of
the oscilloscope as Vmean. When the offset is 0, set the 9500B output
to off and record the mean value of the oscilloscope as Vzero.
5.
Calculate Offseterror (Offseterror= Vmean- Offset), and adjust the
9500B to the output level as step 4.