5.8.2 Negative 50Ω Offset Accuracy
Procedure
Recall Offset - 50 ohm 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 5-7.
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 10, 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 10, column Mean.
Repeat the test for the other channels, substituting channel controls and input
connector. Record the measurements in Table 10.
Calculate the Difference ( ∆ ) by subtracting the DMM voltage reading from the
DSO mean voltage reading. Record the test result in Table 10, and
compare the Difference ( ∆ ) to the corresponding limit in the test record.
WR6K Rev.D Performance Verification 5-27
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