HOW TO USE THE INSTRUMENT

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VERTICALAUTO RANGE

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

VARIABLE AMPLITUDE

AMPL

mV

VAR

V

ST5971

Press both AMPL buttons simultaneously to select the VARiable 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 nearest ’1-2-5’ value.

-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.

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Fluke PM3370B Verticalauto Range, Vertical Variable Amplitude, Press the Auto Range key, Press the upper Ampl key once