Musical Instrument User Manual

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

ST6182