Tektronix, Inc. P6240, User Manual

Page: 132 / 321

Doing a Probe Cal
3–50
TLS 216 User Manual
NOTE . The channel of each probe you intend to run Probe Cal on must belong to
a group. To define groups, see Grouping Waveforms on page 3–55.
8. Connect each probe tip to PROBE CALIBRATION signals available from
the front panel.
NOTE
. You can run Probe Cal with the Y-lead adapter accessory installed on the
probe. However, if any probe has it installed, all probes in the group should have
it installed. With or without the adapter, be careful to observe proper polarity
when connecting to the probe calibration signal.
9. Press Cal Probes (main).
10. Press OK Compensate Probe (side).
11. Wait for Probe Cal to complete (one to ten minutes).
Before Probe Cal completes, if any probe/input combination has not been
compensated, the word Initialized appears under Cal Probes in the main
menu. When Probe Cal completes, the following actions occur:
H
The clock icon will disappear.
H
If every probe in the selected group compensates successfully, the word
Pass appears under Cal Probes in the main menu.
H
If any probe in selected group fails to compensate successfully, the word
Fail appears under Cal Probes in the main menu. Examine the probe
connections to logic scope and repeat step 10.
H
If Probe Cal did not complete successfully, you may get the message
Compensation Error. This error implies that the probe gain (2% error)
and/or offset (50 mV) is too great to be compensated. You can substitute
another probe and restart. You may want to have your probe checked by
service personnel.
12. After the clock icon disappears, verify the word Initialized changed to Pass
under Cal Probe in the main menu. (See Figure 3-24.)
13. If desired, repeat this procedure beginning at step 1 to compensate for other
probe/channel combinations. But before you do so, be sure you give every
probe a 20-minute warm-up period from the time you install it.