To Measure Small Signals On A Large Dc Level - Keysight InfiniiMax III+ Series User Manual

To Measure Small Signals on a Large DC Level

Measuring small AC signals riding on top of a large DC can be challenging. By
subtracting out most or all of the DC component, the signal can be positioned to
better utilize the input's available dynamic range. This is accomplished by applying
an offset by either the probe or oscilloscope channel. Scope channel offset is
applied when viewing differential signals. Probe offset is applied when viewing
single-ended signals.
Normal Offset Behavior
Figure 19
differential signals Normal allows you to apply probe offset using the oscilloscope's
front-panel vertical offset controls.
Figure 19 Probe Offset Dialog Box (Normal Setting)
Probe Offset Behavior
When Probe is selected as shown in
probe provides a very large offset range (up to ±16V) for probing single-ended
signals and a large common-mode range for probing differential signals. Use this
offset range to subtract most or all of the DC component of the input signal so
that the signal can better utilize the dynamic range of the input. This is possible
due to the designs having summing nodes at the amplifier input. For information
InfiniiMax III+ Series Probes User's Guide
shows Normal selected in the Probe Offset dialog box. When probing
Using InfiniiMax III+ Series Probes
Figure 20 on page 28, the InfiniiMax III/III+
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