Features and Functions 3
Keysight 34420A User’s Guide 69
– Front Panel operation: Press and scroll to one of DIGITAL,
ANALOG, or ANA + DIG. Press to enable the filter type. Press the
key to turn the filter on or off.
To set the digital filter averaging, use the MEASurement menu 1: DIG FILTER
command.
– Remote operation: the following commands turn the filters off, on, set the
digital filter count:
INPut:FILTer
:STATe {OFF|ON}
:TYPE {ANAlog|DIGital|BOTH}
:DIGital:RESPonse {SLOW|MEDium|FAST}
:DIGital:PRECharge {ON|OFF}
Using the filters in remote operation is not recommended. Use:
INPut:FILTer:STATe OFF
to disable the filters. The digital filter is also disabled following a remote reset
(*RST) or preset (SYStem:PREset).
Use the math operation (AVERage) commands to obtain a single reading that
is the average of a number of readings (see page 164). An example program is
shown on page 243 in Chapter 6.
If you attempt to use the digital filter in remote operations, be aware of the
following special conditions:
The digital filter requires a number of readings to settle (10, 50 or 100). The
digital filter readings only occur when the meter is triggered to take a reading.
In remote operation a reading is only taken when requested. For example, if
you have set the digital filter to MEDIUM (50 readings), you will need to
request (trigger) 50 readings from the remote interface before the filter can
settle. It is also possible that after 50 readings the digital filter will still not be
settled as described in the next paragraph.
The STATus:OPERational:CONDition register contains a bit that indicates the
settled/unsettled state of the digital filter on a per reading basis. See
page 184 in Chapter 4. You should check the state of this bit for each reading
to ensure the digital filter count has not reset (filter reset operation is
described in the next section).
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