Keysight 53230A - Read

READ?
Syntax
READ?
Description
This command changes the instrument's triggering system from the "idle" state to the "wait-for-trigger"
state. Measurements will begin when the specified trigger conditions are satisfied following the receipt of
the READ? command. Measurements are then sent immediately to the reading memory and the instru-
ment's output buffer.
Remarks
l Sending the READ? command is similar to sending the INITiate command followed immediately by the
FETCh? command.
l You can store up to 1,000,000 measurements in the reading memory. If memory overflows, the new
measurements will overwrite the first (oldest) measurements stored; the most measurements are
always preserved. No error is generated, but the Reading Mem Ovfl bit (bit 14) is set in the Questionable
Data Register.
l The instrument clears all measurements from memory when the measurement function is changed,
when the INITiate:IMMediate, MEASure:<function>? or READ? commands are executed, after a Factory
Reset (*RST command) or after an Instrument Preset (SYSTem:PRESet command).
Return Format
The command sends measurements directly to reading memory and the instrument's output buffer. The
format of the measurements is affected by the FORMat Subsystem commands.
For timestamp measurements, the command returns the prescaler value followed by a comma, followed
by the measurements. The prescaler value is always returned in the format: +100. The format of the
measurements is controlled by the FORMat Subsystem commands.
Examples
The following program segment shows how to use the READ? command with the CONFigure command.
The READ? command places the instrument in the "wait-for-trigger" state, triggers a measurement when
the rear-panel Trig In BNC is pulsed (low by default), sends the measurements to memory, and then trans-
fers the measurements to the instrument output buffer.
CONF:FREQ 1.0E6,.001
TRIG:SOUR EXT
READ?
Typical Response: +1.21513398300000E+006
READ?
24 Keysight 53220A/53230A Programmer's Reference