Measuring Waveforms
TDS 500D, TDS 600B, & TDS 700D User Manual
3–159
NOTE. Probe Cal is not recommended with the P6139A passive probe. This
probe typically has little gain and offset error, and therefore, the improvement in
performance after a Probe Cal is not worth the time needed to do the Probe Cal.
Probe Cal makes significant performance improvements when performed with
active probes or older passive probes.
To run a probe cal, follow the instructions regarding prerequisites below and then
do the steps that follow:
If you are installing an active probe, such as the P6243 or P6245, there are
no prerequisites to performing this procedure. Start at step 1.
If you are compensating for a passive probe with this procedure you must
first compensate the low frequency response of the probe. First, do steps 1
and 2 below, and then compensate the probe by following the instructions
that came with your probe. (Or see To Compensate Passive Probes on
page 3–6.) Then continue with step 3 of this procedure.
1. Install the probe on the input channel on which it is to be used.
2. Power on the digitizing oscilloscope and allow a 20 minute warm-up before
doing this procedure.
3. Press SHIFT UTILITY ➞ System (main) ➞ Cal (pop-up).
4. Look at the status label under Signal Path in the main menu. If the status
does not read Pass, perform a signal path compensation (Signal Path
Compensation, page 3–156), and then continue with this procedure.
5. Press the front-panel button corresponding to the input channel on which you
installed the probe.
6. TDS 600B: Press VERTICAL MENU ➞ Cal Probe (main).
7. TDS 500D and TDS 700D: Press VERTICAL MENU ➞ Probe Func-
tions (main) ➞ Cal Probe (side).
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