TDS 420A, TDS 430A, TDS 460A & TDS 510A User Manual
3–89
Probe Compensation
Passive probes require compensation to ensure maximum distortion-free input to
the digitizing oscilloscope and to avoid high frequency amplitude errors (see
Figure 3–46). If your using a TDS 510A, see Probe Cal on page 3–83.
Probe Compensated Correctly
Probe Overcompensated
Probe Undercompensated
Figure 3–46: How Probe Compensation Affects Signals
To Compensate Passive Probes
Do the following steps to compensate your probe:
1. Connect the probe to the probe compensation signal on the front panel.
2. Press AUTOSET.
NOTE. When you connect an active probe to the oscilloscope (such as the
P6243), the input impedance of the oscilloscope automatically becomes 50 . If
you then connect a high impedance passive probe, you need to set the input
impedance back to 1 M. Step 4 explains how to change the input impedance.
3. Press VERTICAL MENU
➞ Bandwidth (main) ➞ 20 MHz (side).
4. If you need to change the input impedance, press Coupling
(main). Then
toggle the side menu selection to get the correct impedance.
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