290 Keysight InfiniiVision 3000T X-Series Oscilloscopes User's Guide
17 Digital Voltmeter and Counter
Digital Voltmeter
The digital voltmeter (DVM) analysis feature provides 3-digit voltage
measurements on any analog channel. DVM measurements are asynchronous
from the oscilloscope's acquisition system and are always acquiring.
The DVM display is a seven-segment readout like you would see on a digital
voltmeter. It shows the selected mode as well as the units. Units are selected
using the Units softkey in the channel's Probe Menu.
The DVM display also has a scale that is determined by the channel's vertical scale
and reference level. The scale's blue triangle pointer shows the most recent
measurement. The white bar above that shows the measurement extrema over the
last 3 seconds.
The DVM makes accurate RMS measurements when the signal frequency is
between 20 Hz and 100 kHz. When the signal frequency is outside this range,
"<BW Limit?" or ">BW Limit?" appears in the DVM display to caution you about
inaccurate RMS measurement results.
To use the digital voltmeter:
1 Press the [Analyze] key.
2 Press Features; then, select Digital Voltmeter.
3 Press Features again to enable the DVM measurements.
4 Press the Source softkey and turn the Entry knob to select the analog channel
on which digital voltmeter (DVM) measurements are made.
The selected channel does not have to be on (displaying a waveform) in order
for DVM measurements to be made.
5 Press the Mode softkey and turn the Entry knob to select the digital voltmeter
(DVM) mode:
• AC RMS — displays the root-mean-square value of the acquired data, with
the DC component removed.
• DC — displays the DC value of the acquired data.
• DC RMS — displays the root-mean-square value of the acquired data.
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