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Making Measurements

Measuring Voltage 4

4-5

Function modifiers:

D FLTR A filter for quieting noisy measurments. This filter averages readings

to reduce reading noise when in immedicate trigger mode or when in

trigger mode with an unending number of triggers selected. The filter

is only available for dc functions at rates slower than 1 PLC. The

number of readings averaged by the digital filter varies with dc

function and range.

A FLTR A 3-pole analog filter for improving noise immunity. The filter is

active when this soft key label is highlighted and will increase

stabilization time of the measurement. See Appendix D for more

information on when to use the analog filter.

Note

For best results, the filter may require zeroing the

function when used.

RATIO DC measurement voltage divided by dc reference voltage. For dc

ratio, connect the reference HI/LO to the Meter’s HI/LO sense

terminals and the measurement voltage to the Meter’s HI/LO input

terminals. Note the specified measurement range applies to the input

terminals only.

Note

For best results in RATIO, the two input commons must

be shorted at the Meter terminals. The analog filter

(A FLTR) should be off.

2ND MEAS Cycles the secondary display through the measurement functions

listed below, and then off. When a second measurement function is

selected, the 2ND MEAS soft key label is highlighted.

VAC - Displays the ac signal riding on the measured dc voltage.

Note

DCV/ACV dual mode should not be used at frequencies

below 20 Hz.

See the “Range Keys” section in Chapter 1 to learn how to switch between auto and

manual ranging.

Tektronix DMM4020 User Manual

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