User`s guide

53220A/53230A User’s Guide 181
Triggering and Gating 5
The specified edge (slope) of the gate signal crossing the threshold starts the
gate. (More information on the INPut subsystem can be found in Chapter 4 -
“53220A/53230A Input Signal Conditioning”.)
When using external sources INPut[1] and INPut2, the channel selected as
the gate source cannot be the same channel on which the measured signal is
applied. That is, the gate start source channel cannot be involved in the mea-
surement.
Gate Start Configuration Example
The following example shows low-level user control of the start gate by setting
multiple parameters.
//configure the counter for an externally gated frequency
//measurement. The gate start signal is applied to the rear
//panel ‘Gate In’ BNC
CONF:FREQ (@2) // frequency measurement on channel 2
TRIG:SOUR INT // use internal trigger source
SAMP:COUN 3 // set 3 readings (gate cycles)
SENS:GATE:STAR:SOUR EXT // set an external gate source
SENS:GATE:EXT:SOUR EXT // select rear panel Gate In BNC
OUTP:STAT OFF // disable BNC as an output
SENS:GATE:STAR:SLOP POS // set a pos. start gate slope
SENS:FREQ:GATE SOUR ADV // low-level gate control
Setting a Gate Start Delay
When using either an internal (immediate) or external signal to start (open)
the gate, a delay from when the signal is received to when the gate is started
(opened) can be specified. The delay source and its parameters are set with
the commands: