Keysight InfiniiVision HD3 Series - Page 236

236 Keysight InfiniiVision HD3-Series Oscilloscopes User's Guide
17 Digital Voltmeter and Counters
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 specified in
the channel's Probe dialog box.
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 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 From the main menu, choose Measure > Digital Voltmeter (DVM)....
2 In the DVM dialog box, select On to enable or disable the digital voltmeter.
3 From the Source drop-down list, 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.
4 From the Mode drop-down list, select:
• 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.
5 If the selected source channel is not used in oscilloscope triggering, select Auto
Range to disable or enable automatic adjustment of the DVM channel's vertical
scale, vertical (ground level) position, and trigger (threshold voltage) level (used
for the counter frequency measurement).
When enabled, Auto Range overrides attempted adjustments of the channel's
vertical scale and position knobs.
When disabled, you can use the channel's vertical scale and position knobs
normally.