3 Features and Functions
92 Keysight 34420A User’s Guide
Reading Hold
The reading hold feature allows you to capture and hold a stable reading on the
front-panel display. This is especially useful in situations where you want to take a
reading, remove the test probes, and have the reading remain on the display.
When a stable reading is detected, the meter beeps and holds the reading on the
display.
The reading hold feature is available only from the front panel. If you go to remote
when reading hold is enabled, the meter ignores it; when you return to local (front
panel), reading hold is enabled again.
– Reading hold has an adjustable sensitivity band (adjustable only from the front
panel) to allow you to select which readings are considered stable enough to
be displayed. The band is expressed as a percent of reading, on the selected
range. The meter will capture and display a new value only after three
consecutive readings are within the band.
Select one of these values: 0.01%, 0.10% (default), 1.00%, or 10.0% of
reading.
For example, assume that the 1.00% band is selected and a 5 volt signal is
applied to the meter. If three consecutive readings are between 4.95 volts and
5.05 volts, the meter will beep and display a new reading.
– The sensitivity band is stored in volatile memory; the meter sets the band to
0.10% when power has been off or after an interface reset.
– If the meter is in autorange when you enable reading hold, it will autorange to
the correct range. If the meter is in the manual range mode, the same fixed
range will be used for reading hold.
– For certain applications, it may be useful to use reading hold with reading
memory. See also “Reading Memory” on page 103.
– Front Panel operation: After enabling reading hold, you can select a different
sensitivity band by pressing
(Menu Recall).
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