Agilent Technologies 54622D Especificações descarregar pdf (Página 7)

6) PROBE COMPENSATION: This step is a “MUST DO” procedure, each and every time you

turn on an oscilloscope. In fact, you must do it if you move a probe from one channel to

another, and especially from one ‘scope to another ‘scope (for example, from the analog to

the digital ‘scope).

If you don’t make sure that each probe is compensated properly, you can wind up with

incorrect waveforms and major measurement errors. The error can be seen immediately

with pulse waveforms (like the squarewave shown below), but does NOT show up at all for

sinusoidal waveforms (AC signals). All measurements of AC signal amplitude and phase

can have big errors if compensation is not done!

In fact, performing probe compensation is so important that oscilloscope manufacturers put a

“Probe Adjust” or “Probe Comp(ensation)” output voltage on the front panel of most

oscilloscopes.

PROBE COMPENSATION PROCEDURE:

a. Turn on the oscilloscope.

b. Connect a 10X probe to the Vertical

Channel 1 BNC input connector, and

connect the probe tip to the Probe

Comp output on the lower right side

of the front panel.

c. Press the Save/Recall key, then

press the Default Setup softkey

under the display.

d. Press the Autoscale key on the front

panel. You should now see a square

wave, with 5 divisions peak-to-peak

vertically.

e. Check the waveform presentation for overshoot and rolloff (see Figure above). If necessary,

adjust the probe compensation screw on the probe assembly for flat tops on the

waveforms.

f. Disconnect the probe connected to Channel 1, and set it aside. Connect the other 10X

probe to the Vertical Channel 2 BNC input connector.

g. Press the Autoscale key on the front panel. You should now see a square wave, with 5

divisions peak-to-peak vertically.

h. Check the waveform presentation for overshoot and rolloff (see Figure above). If necessary,

adjust the probe compensation screw for flat tops on the waveforms.

Make sure that both probes, for Channel 1 and Channel 2, are properly compensated

before proceeding.

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Agilent Technologies 54622D Especificações Página 7