Stanford Research Systems SR865A, Operation Manual

Page: 126 / 221

108 Programming Chapter 4
SR865A DSP Lock-in Amplifier
Example
HARMDUAL 2 Set the dual external harmonic detect to 2
HARMDUAL?
Returns the dual external harmonic number i
BLADESLOTS(?) {SLT6 | SLT30 | i }
The BLADESLOTS i command configures the lock-in for operation with an external
SR540 chopper. Before proper operation in RSRC EXT mode, the SR865A must be
configured for either 6-slot (i=0) or 30-slot (i=1) operation, based on the hardware
installed on the SR540 chopper. You can read more about operation in chop mode on
page 76.
Example
BLADESLOTS SLT30 Configure for 30-slot chopper blade
BLADESLOTS 1
BLADESLOTS?
Returns chopper blade configuration
BLADEPHASE(?) { p } { UDEG | MDEG | DEG | URAD | MRAD | RAD }
The BLADEPHASE p command sets the phase of the SR540 chopper blade. When
operating a single chopper, this has little effect since the SR865A will follow the
chopper. If multiple SR865A/SR540 systems are being used in a single experiment,
BLADEPHASE can be used to modify the relative phase of the choppers. Blade phase
may be specified in degrees (default), or millidegrees, microdegrees, radians,
milliradians, or microradians.You can read more about chopper blade phase on page 77.
Example
BLADEPHASE 43.21 DEG Set the blade phase to 43.21 deg
BLADESLOTS 4.321E1
BLADEPHASE?
Returns chopper blade phase
SLVL(?) { v } { NV | UV | MV | V }
The SLVL v command sets the sine out amplitude to v. The value of v will be rounded to
3 digits or 1 nV, whichever is greater. The amplitude may be programmed from 1 nV to
2.0 V.
Example
SLVL 12.3 MV Set the sine out amplitude to 12.34 mV
SLVL 1.23E-2
SLVL 0.0123
SLVL?
Returns the sine out amplitude in Volts
SOFF(?) { v } { NV | UV | MV | V }
The
SOFF v
command sets the sine out dc level to v. The value of v will be rounded to 3
digits or 0.1 mV, whichever is greater. The level may be programmed from
−5.00
V to
+5.00 V.