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USING THE COMBISCOPE INSTRUMENTS 3 - 23
LF-REJECT (30 KHz cutoff frequency):
LF reject (HF passed) causes the signal to be
passed from the cutoff frequency (30 KHz) to the
full bandwidth frequency (60/100/200 MHz).
PROGRAM EXAMPLE:
TRIGger:FILTer:LPASs:STATe ON
Sets Low-Pass filter on + cutoff frequency = 0 Hz
(DC coupling).
TRIGger:FILTer:LPASs:FREQuency 3E+4
Sets cutoff frequency = 30 KHz;
this selects MTB trigger LF-reject.
HF-REJECT (30 KHz cutoff frequency)
HF reject (LF passed) causes the signal to be
passed from 0 Hz to the cutoff frequency
(30 KHz).
PROGRAM EXAMPLE:
***
*** Select HF-reject on MTB triggering.
TRIGger:FILTer:HPASs:STATe ON
Sets High-Pass filter on;
this selects MTB trigger HF-reject.
3.4.1.2 Video triggering
TV video triggering enables stable triggering on video frames and lines from
various TV standards without adjusting the trigger level, and can be selected by
programming TRIGger:TYPE VIDeo.
Video triggering can be programmed on signals with a positive or negative signal
polarity using the TRIGger:VIDeo:SSIGnal command.
Figure 3.6 LF Reject
FULL BANDWIDTH30kHz
LF -REJECT
-3dB
0dB
FREQ.
ST7428
Figure 3.7 HF Reject
FULL BANDWIDTH30kHz
HF-REJECT
-3dB
0dB
FREQ.
ST7429