5-22 Performance Verification Rev. D Sept 2007
5.8.2 Negative Offset Accuracy
Procedure
Recall Offset - Negative.lss or configure the DSO as shown in 5.8.1 and for
each channel make the following change :
Input offset : −0.750 Volt on all 4 Channels
Connect the test equipment as shown in Figure 5-2.
Set the output of the external DC voltage reference source until the DMM
measures +0.750 Volt.
1) Verify that the displayed trace A : Average (1) is on the screen, near the center
horizontal graticule line. If the trace is not visible, modify the DC voltage
reference source output until the trace is within ± 2 divisions of center.
2) Connect the DMM and record the voltage reading in Table 8, column DMM.
3) Disconnect the DMM from the BNC T connector.
4) Press Clear Sweeps
5) After 100 sweeps, Read off the DSO Mean parameter voltage, and record the
measurement in Table 8, column Mean.
Repeat the test for the other channels, substituting channel controls and input
connector. Record the measurements in Table 8.
Calculate the Difference ( ∆ ) by subtracting the DMM voltage reading from the
DSO mean voltage reading. Record the test result in Table 8, and
compare the Difference ( ∆ ) to the corresponding limit in the test record.
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