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FUNCTION REFERENCE 5 - 39
INPUT ATTENUATOR MANUAL + AUTOMATIC
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.
Function of key pair AMPL/VAR
Key sequence:
Key pair to adjust the vertical input sensitivity
in coarse or fine steps.
AUTO
RANGE
CH1
100mV
CH1
500mV
AMPL/div AMPL/div
MAT4165
9312
AMPL
AMPL
ST6182