Fluke CombiScope PM3370B User Manual page 218

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Description:
The TRIGger:FILTer:LPASs:FREQuency command sets the MTB cutoff
frequency, which defines the trigger coupling. The specified frequency values are
rounded as follows:
- 0 .. 4.99
- 5 .. 4999.99
- Š15000
The TRIGger:FILTer:LPASs:STATe command activates (ON) or deactivates
(OFF) the MTB low-pass filter.
Activating the MTB low-pass filter:
- automatically deactivates the MTB high-pass filter.
- sets the high-pass cutoff frequency at bandwidth (60/100/200 MHz).
- sets the low-pass cutoff frequency at 0 Hz (DC coupling).
DeActivating the MTB low-pass filter:
- automatically activates the MTB high-pass filter.
- sets the high-pass cutoff frequency at 30 KHz.
- sets the low-pass cutoff frequency at 0 Hz.
After a RST command, the low-pass filter is ON and the cutoff frequency is 0 Hz
*
(DC coupling).
Note: The following coupling exists between programming the cutoff frequency
and (de)-activating the low-pass or high-pass filter:
FREQUENCY
0 Hz
10 Hz
30 KHz
Example:
→
Send TRIGger:FILTer:LPASs:STATe ON
→
Send TRIGger:FILTer:LPASs:FREQuency 3E+4
'
Front panel compliance:
The TRIGger:FILTer:LPASs commands are the remote equivalent of the front
panel TRIGGER MAIN TB - ac, dc, lf-rej, hf-rej softkey menu.
is rounded to
is rounded to 10 Hz, i.e., AC coupling.
is rounded to 30 KHz, i.e., LF-reject.
LOW-PASS ON
DC coupling
AC coupling
LF-reject
COMMAND REFERENCE
0 Hz, i.e., DC coupling.
FILTER
HIGH-PASS ON
HF-reject
HF-reject
HF-reject
Sets Low-Pass filter on + cutoff
frequency = 0 Hz (DC coupling).
Automatically switches High-Pass
filter off.
Sets cutoff frequency = 30 KHz
(LF-reject).