Teledyne LeCroy WaveLink Differential Probe Series (8-13 GHz) - Manual (Page 54)

WaveLink Medium-Bandwidth (8-13 GHz) Differential Probe
Verification of LF Attenuation Accuracy
This procedure should be performed after the Functional Test. The probe should be warmed up for
at least 20 minutes.
1. Remove the probe test leads from the PCF200 fixture.
2. Set scope Channel 1 and Channel 2 to 100 mV/div with 0 V offset. Set the trigger to Channel 1,
0V. Set the horizontal scale to 10 ms/div.
3. Turn on measurements and set P1 to measure the standard deviation of Channel 1 {sdev(C1)}
and P2 to measure the standard deviation of channel 2 {sdev(C2)}.
4. Set the function generator to output a 50 Hz sine wave at 100 mVrms into 50Ω.
5. Set the DMM to measure AC V and connect leads to the DMM.
6. Momentarily remove the probe under test from Channel 1, and connect the function generator
to Channel 1 using the following accessories: Function Generator -> BNC (m) to SMA (f) adapter -
> SMA cable -> PCF200 -> ProLink Adapter -> scope Channel 1.
7. Touch the DMM leads to the PCF200 signal line and ground and record the measured voltage
amplitude on the test record (line 7).
8. Remove the leads from the PCF200 and record the scope Channel 1 standard deviation
measurement on the test record (line 8).
9. Remove the function generator connection from Channel 1 and install it on Channel 2.
Reconnect the probe under test to Channel 1.
10. Press AutoZero on the probe dialog to remove any residual offset from the measurement.
11. Calculate the Channel 1 error by subtracting the value recorded on line 8 by the value recorded
on line 7 and dividing by the value on line 7. Record the value in percent on the test record (line
11).
12. Touch the DMM leads to the PCF200 signal line and ground and record the measured voltage
amplitude on the test record (line 12).
13. Connect the leads of the probe/tip under test to the PCF200 and record the scope Channel 1
standard deviation measurement on the test record (line 13).
14. Calculate the Probe-Channel 1 error by subtracting the value recorded on line 13 by the value
recorded on line 12 and dividing by the value on line 12. Record the value in percent on the test
record (line 14).
15. Subtract the Channel 1 Error (line 11) from the Probe – Channel 1 Error (line 14) to get the Probe
– only error (line 15).
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