Measuring Waveforms
TDS 500B, TDS 600B, & TDS 700A User Manual
3–109
Some Probes Cannot Be Compensated. Some types of probes can be gain
compensated, some can be offset compensated, and some can be compensated
for both. Some probes cannot be compensated at all. Note the following
restrictions:
The oscilloscope cannot compensate probes that have an attenuation factor of
greater than 20X. If you attempt to compensate such a probe you will get an
error message.
The oscilloscope cannot compensate probes that have gain and/or offset
errors that are too great (2% gain and/or 50 mV offset). If these errors
are within specified limits for your probe, you may want to use another
probe. If they are not within specification, have your probe checked by
service personnel.
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 3–4.) 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 3–106), and then continue with this procedure.
5. Press the front-panel button corresponding to the input channel on which you
installed the probe.
6. Press VERTICAL MENU ➞ Cal Probe (main).
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