Measurement Queries H-3
Limitations
This command won’t work if the trigger source is set for BUS or EXTERNAL. This will
cause a –214, “Trigger deadlock” error. Under this condition, one should use a “:FETCh?” query
or a “:DATA:FRESh?” query (see page H-4). If the trigger model is continuously initiating
(:INIT:CONT ON), sending this query may cause a –213, “Init ignored” error, but will still give
a new reading.
When appropriate
If the Model 2182 receives a *RST command, then it defaults to :INIT:CONT OFF,
:TRIG:SOUR IMM, and :TRIG:COUNT 1. Sending a “:READ?” query under these conditions
will trigger a new reading.
:MEASure[:<function>]?
What it does
This query will reconfigure the instrument to the function specified in the query, set the
trigger source for immediate, set the trigger count to 1, and configure the measurement
parameters to *RST defaults. It will then trigger a single reading, and return the result.
Limitations
This query is much slower than a “:READ?” or “:FETCh?” query because it has to
reconfigure the instrument each time it is sent. It will reset the NPLC, autoranging, and
averaging to default settings.
When appropriate
This is an ideal command for taking one-shot measurements if the default settings for a
measurement are appropriate and speed is not a requirement.
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