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Probe Compensation
TDS 620A, 640A & 644A User Manual
3Ć101
4. If you need to change the input impedance, press Coupling (main).
Then toggle the side menu selection W to get the correct impedance.
5. Adjust the probe until you see a perfectly flat top square wave on the
display. Figure 3Ć53 shows where the adjustment is located.
Figure 3Ć53:ăP6139A Probe Adjustment
See Probe Selection, on page 3Ć102.
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