244 53220A/53230A User’s Guide
7 Formats and Data Flow
// frequency meas of 500 kHz signal with uHz resolution
CONF:FREQ 500E3, 1E-6, (@1) // configure counter
TRIG:COUN 2 // set trigger count
SAMP:COUN 2500 // set readings/trigger
INIT:IMM // initiate counter to start readings
wait 2500 seconds
R? 2500 // read and remove first 2500 readings
wait 2500 seconds
R? // read and remove all remaining readings
DATA:REMove? <count>[,WAIT] - is used following
INITiate:IMMediate.Transfers count number of readings to the output
buffer and erases the readings in reading memory. Unlike FETCh?,
DATA:REMove? can be used to transfer readings before the total reading
count is reached (TRIGger:COUNt x SAMPle:COUNt) to prevent a memory
overflow. However, count is a required parameter and, therefore, count num-
ber of readings must be available before they can be removed. Including WAIT
will cause the command to wait until count readings are available. This will
prevent error -222, “Data Out of Range” from occurring if the specified count
is not available.
If the data format is REAL (FORMat subsystem), the readings are transferred
in Definite-Length Block format (Table 7-1). The ‘oldest’ reading is transferred
first (first in - first out).
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