Agilent Technologies 53220A, Руководство пользователя

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53220A/53230A User’s Guide 171
Triggering and Gating 5
External Gate Signal Polarity
When using an external gate source, the polarity of the gate signal is changed
with the command:
[SENSe:]TINTerval:GATE:POLarity {POSitive|NEGative}
[SENSe:]TINterval:GATE:POLarity?
(query form)
POSitive
enables a time interval measurement following a positive edge on
the Gate In/Out BNC.
NEGative
enables a time interval measurement follow-
ing a negative edge on the Gate In/Out BNC. For either edge, the measurement
begins on the first start event after the (gate) edge.
Following a reset (
*RST
) or instrument preset (
SYSTem:PRESet
or
Preset
key), the negative edge (polarity) is selected.
Gate Source ADVanced
Gate source
ADVanced
enables extended control of the gate signal through the
counter’s
SENSe:GATE
commands (see Advanced Gate Control later in this
chapter).
The following example shows configuration of a time interval measurement
beginning with high-level configuration of the counter, setting up the start and
stop events, and changing the polarity and gate source.
//configure the counter for a time interval measurement
//using external gating to start the measurement