Stanford Research Systems SR865A, Operation Manual

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Chapter 4 Programming 109
SR865A DSP Lock-in Amplifier
Example
SOFF 34.5 MV Set the sine out dc level to 34.5 mV
SOFF 3.45E-2
SOFF 0.0345
SOFF?
Returns the sine out dc level in Volts
REFM(?) { COMmon | DIFference | i }
The REFM i command sets the sine out dc mode to common (i=0) or difference (i=1).
Example
REFM DIF Set the dc mode to difference
REFM DIFFERENCE
REFM 1
REFM?
Returns the dc mode i
RSRC(?) { INT | EXT | DUAL | CHOP | i }
The RSRC i command sets the reference source to internal (i=0), external (i=1), dual
(i=2) or chop (i=3).
Example
RSRC EXT Set the reference mode to external
RSRC 1
RSRC?
Returns the reference mode i
RTRG(?) { SIN | POSttl | NEGttl | i }
The RTRG i command sets the external reference trigger mode to sine (i=0), positive
TTL (i=1) or negative TTL (i=2).
Example
RTRG POS Set the external reference trigger to positive TTL
RTRG POSTTL
RTRG 1
RTRG?
Returns the external reference trigger mode i
REFZ(?) { 50ohms | 1Meg | i }
The REFZ i command sets the external reference trigger input to 50
Ω (i=0) or
1 MΩ (i=1).
Example
REFZ 50 Set the external reference input to 50 Ω
REFZ 50OHMS
REFZ 0
REFZ 1M
Set the external reference input to 1 MΩ
REFZ 1MEG
REFZ?
Returns the external reference input i