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Chapter 3 Basic Measurements
3.1 Preparation
One of the first things you would like to do with your multimeter is to become acquainted with its front
panel. We have provided some exercises in foregoing chapters about preparations for use and
operations of front panel.
The front panel has six rows of keys to select various functions and operations. Most keys have a shifted
function printed in blue above the key. To perform a shifted function, press (the Shift annunciator
will turn on). Then, press the key that has the desired label above it. For example, to select the AC
current function, press then press (ACI).
If you accidentally press , just press it again to turn off the Shift annunciator.
3.2 Measuring Voltage
Voltage ranges: 200 mV, 2 V, 20 V, 200 V, 1000 V (750 VAC) (model 5491B: 500 mV, 5 V, 50 V, 500 V,
1000 V (750 VAC))
Maximum resolution: 50 µV for DC and 1 mV for AC (on 200 mV range (model 2831E) and on 500 mV
range (model 5491B))
AC technique: true RMS, AC-coupled, 1000 V Peak AC
3.2.1 Connections
Assuming the multimeter is under factory default conditions, the basic procedure is as follows:
1. Connect test leads to and COM terminals.
2. Select DC or AC voltage measurement by pressing or .
3. Press to toggle between auto and manual ranging. Notice that the AUTO annunciator is
displayed when in auto ranging mode. If you want manual ranging, use the RANGE and
keys to select a measurement range consistent with expected voltage.
4. Connect test leads to the sources as shown in Figure 3-1.
CAUTION: Do not apply more than 1000V peak to the input or instrument damages may occur.
5. In manual range, if the “OVL.D” message is displayed, press the up key to select a higher
range until a desired reading is displayed (or press key for auto ranging). Use the lowest
possible range for the best resolution.
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