Stanford Research Systems SR124 Operation And Service Manual page 64

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SLVL(?) g
Example:
RSLP(?) z
Example:
FRNG(?) z
Example:
Reference output amplitude
Set (query) the reference oscillator output amplitude to g , in volts
RMS. The default value is SLVL 0.100.
Allowed values for SLVL may be restricted if the DC Bias is enabled.
See section 3.4 for details.
SLVL 1.5E-6
Reference slope shape
Set (query) the external reference input slope mode to z (SINE 0,
TTL 1) .
RSLP is used to configure the external reference input trigger circuit.
When set to RSLP SINE, the Ext. In BNC input is AC-coupled to a
discriminator circuit armed to trigger on positive-going zero cross-
ings. When set to RSLP TTL, the Ext. In connection is DC-coupled,
and the discriminator looks for positive-going transitions crossing a
1 V threshold, compatible with TTL and CMOS logic.
RSLP SINE
Reference oscillator range
Set (query) the reference oscillator range to z (FRNG P2 0, FRNG 2
1, FRNG 20 2, FRNG 200 3, FRNG 2K 4) .
In all modes, the oscillator range FRNG must first be set to the cor-
rect span for the desired oscillator frequency. If operating in one
of the harmonic modes (FMOD EXT2F or EXT3F), the FRNG setting
must span the harmonic frequency, which may not necessarily in-
clude the (lower) external input frequency. For example, if operating
in second harmonic mode (FMOD EXT3F) and the external input is
1.5 kHz, the oscillator will lock to 4.5 kHz and the range must be
set to FRNG FRNG 200 or FRNG FRNG 2K; it will not lock if set to
FRNG FRNG 20.
Each range spans 2 decades, and overlaps its adjacent ranges by one
decade each:
z Value Frequency Range (Hz)
0.2 – 21
FRNG P2 0
2 – 210
FRNG 2 1
20 – 2.1 k
FRNG 20 2
200 – 21 k
FRNG 200 3
FRNG 2K 4 2 k – 210 k
FRNG 3.
Remote Operation
SR124 Analog Lock-In Amplifier