Data Transfer Commands - Stanford Research Systems SR124 Operation And Service Manual

4.4 Commands
Example:
AREF(?) z
ASST(?) z

4.4.11 Data transfer commands

OUTR?
ORTI?
SR124 Analog Lock-In Amplifier
Quering AOFF will respond with one of the same 5 tokens as de-
scribed above, for AGAN.
AOFF 1
Measure reference frequency
Set (query) the "measure the reference oscillator frequency" function
to z (OFF 0, ON 1) . Setting AREF with no parameter will initiate a
reference frequency measurement cycle, and is equivalent to AREF 1.
The set version of AREF can initiate an auto measurement cycle by
commanding AREF to ON (1). If a currently-executing auto o set
must be cancelled in-progress, send the command AREF OFF.
Quering AREF will respond with one of the same 5 tokens as de-
scribed above, for AGAN.
External lock-assist
Set (query) the reference oscillator lock-assist function to z (OFF 0,
ON 1) . Setting ASST with no parameter will initiate an auto lock-
assist cycle, and is equivalent to ASST 1.
The set version of ASST can initiate a lock-assist cycle by command-
ing ASST to ON (1). If a currently-executing auto lock-assist must be
cancelled in-progress, send the command ASST OFF.
Quering ASST will respond with one of the same 5 tokens as de-
scribed above, for AGAN.
Output
Query the output value, in volts. The range of OUTR? responses is
always in the range 10
Output RTI
Query the output value, in volts, referenced to input.
The relationship betwen OUTP? and ORTI? is
ORTI?
where V is the full-scale voltage sensitivity, in volts. For example,
FS
if SENS 8 (S50UV), V
ORTI? returns 0.000015700 (15.7 V input).
OUTR? 10.
(OUTP? 10 V)
6
50 10 V. Then if OUTP?
FS
4 – 17
V
FS
3.14, then