Fluke PM-3390B, PM-3380B DC Coupling 0 Hz cutoff frequency, AC Coupling 10 Hz cutoff frequency

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.

3 - 22 USING THE COMBISCOPE INSTRUMENTS

DC COUPLING (0 Hz cutoff frequency):

0dB
-3dB	DC COUPLING
DC	FULL BANDWIDTH
	FREQ.
	ST7427
Figure 3.4	DC Coupling

DC coupling causes the signal to be passed over the full bandwidth (from 0 Hz to 60/100/200 MHz).

PROGRAM EXAMPLE:

***

***Select DC coupling on input signal channel 2. SENSe:FUNCtion:ON "XTIMe:VOLTage2" Sets CH2 on.

INPut2:COUPling DC	Sets CH2 input signal DC coupled.
TRIGger:SOURce INTernal2	Sets trigger source = CH2.
***

*** Select DC coupling on MTB triggering.

TRIGger:FILTer:LPASs:STATe ON	Sets Low-Pass filter on + cutoff frequency = 0 Hz;
	this selects MTB trigger DC coupling.

AC COUPLING (10 Hz cutoff frequency):

0dB
-3dB	AC COUPLING
10Hz	FULL BANDWIDTH

FREQ.

ST7426

AC coupling causes the signal to be passed from 10 Hz to the full bandwidth frequency (60/100/200 MHz).

Figure 3.5 AC Coupling

PROGRAM EXAMPLE:

***

***Select AC coupling on input signal channel 3. SENSe:FUNCtion:ON "XTIMe:VOLTage3" Sets CH3 on.

INPut3:COUPling AC	Sets CH3 input signal AC coupled.
TRIGger:SOURce INTernal3	Sets trigger source = CH3.
***

*** Select AC coupling on MTB triggering. TRIGger:FILTer:LPASs:STATe ON

TRIGger:FILTer:LPASs:FREQuency 10