Fluke CombiScope PM3370B User Manual page 41

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DC COUPLING (0 Hz cutoff frequency):
0dB
-3dB
DC
Figure 3.4 DC Coupling
PROGRAM EXAMPLE:
***
*** Select DC coupling on input signal channel 2.
SENSe:FUNCtion:ON "XTIMe:VOLTage2"
INPut2:COUPling DC
TRIGger:SOURce INTernal2
***
*** Select DC coupling on MTB triggering.
TRIGger:FILTer:LPASs:STATe ON
AC COUPLING (10 Hz cutoff frequency):
0dB
-3dB
10Hz
Figure 3.5 AC Coupling
PROGRAM EXAMPLE:
***
*** Select AC coupling on input signal channel 3.
SENSe:FUNCtion:ON "XTIMe:VOLTage3"
INPut3:COUPling AC
TRIGger:SOURce INTernal3
***
*** Select AC coupling on MTB triggering.
TRIGger:FILTer:LPASs:STATe ON
TRIGger:FILTer:LPASs:FREQuency 10
DC coupling causes the signal to be passed over
the full bandwidth (from 0 Hz to 60/100/200 MHz).
DC COUPLING
FULL BANDWIDTH
FREQ.
ST7427
AC coupling causes the signal to be passed from
10 Hz to the full bandwidth frequency
(60/100/200 MHz).
AC COUPLING
FULL BANDWIDTH
FREQ.
ST7426
USING THE COMBISCOPE INSTRUMENTS
Sets CH2 on.
Sets CH2 input signal DC coupled.
Sets trigger source = CH2.
Sets Low-Pass filter on + cutoff frequency = 0 Hz;
this selects MTB trigger DC coupling.
Sets CH3 on.
Sets CH3 input signal AC coupled.
Sets trigger source = CH3.
Sets Low-Pass filter on + cutoff frequency = 0 Hz;
this selects MTB trigger DC coupling.
Sets cutoff frequency = 10 Hz; this selects
MTB trigger AC coupling.