2. Confirm input channels are within limits for offset accuracy. Do the
following substeps - test Ch 1 first, skipping substep 2.asince Ch 1 is already
selected from step 1.
a. Select an unchecked channel:
■
From the tool bar, touch Measure and then Clear All to remove the
previous measurement.
■
Press the Vertical button of the channel just confirmed to remove the
channel from the display.
■
Press the front-panel Vertical button that corresponds to the channel
you are to confirm.
■
Set the generator output to 0 V.
■
Move the test hookup to the channel you selected.
b. Turn on the measurement Mean for the channel:
■
From the tool bar, touch Measure and select the Ampl tab, More,
and then touch Mean to measure the mean of the current channel.
■
Press the X (Close) button.
c. Set the vertical scale: Set the vertical Scale to one of the settings in the
following table that is not yet checked.
Table 10: Offset accuracy
Scale setting Position setting
(Divs)
Offset setting
5
Termination
setting
Generator
setting
Accuracy limits
6.25 mV 0 0 V 0 V 0 V –3.13 mV to +3.25 mV
+3.4 V +3.5 V +3.4 V +3.3831 V to +3.4169 V
-3.4 V -3.5 V -3.4 V –3.4169 V to –3.3831 V
10 mV 0 0 V 0 V 0 V –3.5 mV to +3.5 mV
+3.4 V +3.5 V +3.4 V +3.3827 V to +3.4173 V
-3.4 V -3.5 V -3.4 V –3.4173 V to –3.3827 V
20 mV 0 0 V 0 V 0 V –4.5 mV to +4.5 mV
+3.4 V +3.5 V +3.4 V +3.3817 V to +3.4183 V
-3.4 V -3.5 V -3.4 V –3.4183 V to –3.3817 V
50 mV 0 0 V 0 V 0 V –7.5 mV to +7.5 mV
+3.4 V +3.5 V +3.4 V +3.3787 V to +3.4213 V
-3.4 V -3.5 V -3.4 V –3.4213 V to –3.3787 V
100 mV 0 0 V 0 V 0 V –12.5 mV to +12.5 mV
+3.4 V +3.5 V +3.4 V +3.3737 V to +3.4263 V
-3.4 V -3.5 V -3.4 V –3.4263 V to –3.3737 V
5
Set as precisely as the instrument's offset resolution permits.
Performance verification (MSO/DPO70000C, MSO/DPO70000DX, and DPO7000C series)
MSO70000C/DX, DPO70000C/DX, DPO7000C, MSO5000/B, DPO5000/B Series 221
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