Fluke CombiScope PM3370B User Manual page 160

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AUTO
RANGE
AMPL
INPUT COUPLING
Description:
The characteristics of the oscilloscope's inputs can be selected for each channel.
A channel can be switched on/off with the toggle key ON. Display of the External
Trigger input signal is switched on/off with the toggle key TRIG VIEW. CH1 is
always switched on when all other channels are switched off.
In the dc coupled mode the complete signal including dc components and
extremely low frequencies (<10 Hz) are displayed. In the ac coupled mode, dc
components are suppressed. This results in a display of the ac components
( 10 Hz).
Ground coupling (GND) interrupts the input signal. The position of the trace is at
the 0 volt level. A continuous ground level indication for each channel can also be
activated. Refer to the description of the UTILITY>>SCREEN&SOUND MENU
function.
The selections are made with the toggle keys AC/DC/GND for the channel inputs,
or AC/DC for the External Trigger input.
The type of coupling is given in the readout area using the symbols
and (GND).
0dB
3dB
10Hz
Effect of ac/dc input coupling
Toggle key to switch the AUTO RANGE function on/off
Toggle key to switch between two vertical input sensitivities
of the External Trigger input channel.
AC-COUPLING
FULL BANDWITH
FREQ.
FUNCTION REFERENCE
0dB
3dB
DC
(ac), = (dc)
DC-COUPLING
FULL BANDWITH
FREQ.
MAT4219