DSP TP104-plus Dokumentacja Pobierz pdf (Strona 18)

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13. Press [GAIN/TC]

Press <Synchronous> to select <200 Hz.

Display the Gain and Time Constant menu again.

This turns on synchronous filtering whenever the

detection frequency is below 200 Hz.

Synchronous filtering effectively removes output

components at multiples of the detection frequen-

cy. At low frequencies, this filter is a very effective

way to remove 2f without requiring extremely long

time constants.

The outputs are now very quiet and steady, even

though the time constant is very short. The

response time of the synchronous filter is equal to

the period of the detection frequency (20 ms in this

case).

This concludes this measurement example. You

should have a feeling for the basic operation of the

menus, knob and numeric entry. Basic lock-in

parameters have been introduced and you should

be able to perform simple measurements.

The Basic Lock-in

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DSP TP104-plus Dokumentacja Strona 18