Fluke CombiScope PM3370B User Manual page 159

FUNCTION REFERENCE
INPUT ATTENUATOR
Description:
The oscilloscope's input has a wide range of sensitivities. This enables signals of
different amplitudes to be displayed on the available screen area. Sensitivity
adjustment is done with key pair AMPL/VAR or a single AMPL toggle key (for the
External Trigger input).
Input sensitivity increases when the top key (mV) is pressed; it decreases when
the lower key (V) is pressed. The sensitivity adjustment can be done in steps or
continuously; switching between these modes is done by pressing both keys
simultaneously. The CRT readout resolution correspondingly changes. The
amplitude of a signal can be determined as described under the 'SCREEN
CONTROLS AND GRATICULE' function. The AUTO RANGE key activates a
continuous automatic adjustment of input sensitivity. The result is a signal
amplitude on the screen between 2 and 6.4 divisions. This functions in digital
mode for input sensitivities up to 50 mV/div. For more information, refer to the
AUTO RANGE function.
For the External Trigger input, the input sensitivity can be adjusted to the two most
commonly used settings (1 V/div and 100 mV/div). Selection is done with a single
toggle key AMPL.
CH1 100mV
AMPL/div
Function of key pair AMPL/VAR
Key sequence:
AMPL
ST6182
Key pair to adjust the vertical input sensitivity
in coarse or fine steps.
MANUAL + AUTOMATIC
AUTO
RANGE
AMPL
CH1 500mV
MAT4165
9312
AMPL/div
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