Tektronix DMM4040 User Manual page 81

Function modifiers:
A filter for quieting noisy measurments. This filter averages readings
D FLTR
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 3-pole analog filter for improving noise immunity. The filter is
A FLTR
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.
For best results, the filter may require zeroing the
function when used.
DC measurement voltage divided by dc reference voltage. For dc
RATIO
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.
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.
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.
Note
Note
Note
Making Measurements
Measuring Voltage
4
4-5