ask question on Agilent Logic Analyzer 16822A

Nov 30, 2007 1 Replies

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kisspigma 18 years ago

I have two signals: clock and data. the swing voltage from 0v to

1.2v. frequency is 33M on clock. I am trying to use Agilent logic analyzer 16822A to capture the two signals, but the the analyzer cannot capture the clock signal. I don't know the reason, I could use oscillascope to see the waveform very easily, but why the logic analyzer cannot capture the waveform?

Could anyone please give me some help or hints?

many thanks.

mary

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Keyser Soze 18 years ago

Two possible reasons:

1 - Most logic analyzer probe have low input impedance about 100k to 250K ohms.

Oscilloscope input impedance is usually about 10M ohms. Your circuit may have trouble driving the logic analyzer input.

2 - Logic analyzer inputs have one voltage threshold.

As the operator you must set the input voltage threshold to about half the peak voltage your circuit provides. In your case about 0.6 volts.

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