Fluke CombiScope PM3370B User Manual page 62

HOW TO USE THE INSTRUMENT
VERTICAL
AUTO
The AUTO RANGE function results in an amplitude display of 2 to 6
RANGE
divisions.
- Press the AUTO RANGE key.
Observe that the amplitude of the signal changes from 6 divisions to 3 divisions.
In the upper right corner of the display ATT 1 is displayed. This indicates that the
AUTO RANGE function is active on input channel 1.
- Press the upper AMPL key once.
The AUTO RANGE function is switched off and the ATT 1 indication disappears
The attenuator is now back in manual control.
VERTICAL
AMPL Press both AMPL buttons simultaneously to select the VARiable
mV
mode. This mode is used to make fine adjustments of the input
amplitude settings between the 1-2-5 steps.
When the VARiable mode is turned off, the oscilloscope selects the
V
nearest '1-2-5' value.
ST5971
- Enter the VAR mode by simultaneously pressing both AMPL keys.
- Adjust amplitude with either AMPL key.
Observe that the sensitivity steps that can be selected are much finer than before
and that the displayed amplitude is continuously adjustable.
Note: The VAR values are calibrated amplitude settings as well. This enables
you to make accurate measurements and readouts even when
intermediate settings are used.
- Adjust AMPL to 220 mV.
- Press both AMPL keys to turn the VARiable mode off.
AUTO RANGE
VARIABLE AMPLITUDE
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