Triggering and Gating 5
Keysight 53220A/53230A User’s Guide 165
The count range is 1 to 1,000,000. CONFigure and MEASure set a default sample
count of ‘1’.
Reading memory can store up to 1,000,000 readings. If the product of the trigger
count and the sample count is greater than 1,000,000 readings, data must be
read from reading memory fast enough to prevent memory overflow. If memory
does overflow, new readings will overwrite the first (oldest) readings stored. The
most recent readings are always preserved. See Chapter 8, "Instrument Status"
for information on monitoring reading memory count.
Sample count example
//configure for frequency, set system trigger and sample
//count parameters; take 2 sets of 100 readings
CONF:FREQ 5E6,0.1,(@2)
TRIG:SOUR EXT // trigger source external
TRIG:SLOP POS // external trigger slope - positive
TRIG:DEL 1 // 1s delay after trigger received
TRIG:COUN 2 // accept 2 system triggers
SAMP:COUN 100 // take 100 rdgs for each trigger
Wait-for-trigger and triggered states
In order for the counter to accept triggers which start the trigger and gate cycle,
the counter must be initiated. Initiating the counter places the instrument in the
wait-for-trigger state (Figure 5-4).
The trigger count and sample count are ignored when making continuous
totalize measurements. The trigger count is also ignored when making
continuous, gap-free frequency or period measurements. Only one trigger is
accepted when using these functions. See the ‘Programmer’s Reference’ section
of the Keysight 53210A/53220A/53230A Product Reference CD for more
information.
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