Measuring Ac Voltage - Fluke 8845A User Manual

2ND MEAS Cycles the secondary display through the measurement functions
See the "Range Keys" section in Chapter 1 to learn how to switch between auto and
manual ranging.

Measuring AC Voltage

To make an ac voltage measurement:
1. Press A.
The ac voltage icon VB will appear in display as shown below.
2. Connect the test leads to the Meter's input as shown in Figure 4-1.
3. Connect the test leads to the circuit and read the measured voltage in the Meter's
display.
Function modifiers:
Filter
dB
dBm
key label is highlighted and will increase stabilization time or the
measurement.
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.
0.3861
F1 F2 F3
Displays the filter menu. For best accuracy and stable readings,
choose a filter based on the lowest frequency to be measured.
3HZ SLOW Provides higher measurement accuracy on ac signals
between 3 Hz and 20 Hz. However, the measurement
cycle time is longer than it is when using the 20 Hz
filter.
Provides higher measurement accuracy on ac signals
20HZ
between 20 Hz and 200 Hz. The measurement cycle
time is longer, however, than it is when using the 200
Hz filter.
Provides accurate measurements on ac signals 200 Hz
200 HZ
and above.
Displays the measured voltage as a decibel value referenced to a
stored relative value (dB = 20 log(Vnew/Vstored). The stored value is
obtained from the first measurement the Meter makes after pressing
the dB soft key. All future measurements are displayed using the
stored value as an offset. To take the Meter out of dB mode, press the
the dB soft key.
Displays the measured voltage as a decibel value referenced to 1
milliwatt (dBm = 10 log(Vnew / reference resistance / 1 mW). To
Making Measurements
~
mV
F4 F5
4
Measuring Voltage
caw022.eps
4-5