Stanford Research Systems SR865A Operation Manual page 125

Chapter 4
Example
FREQ 12.34E3
FREQ 12.34 KHZ
FREQ 12340
FREQ?
FREQINT(?) { f } { HZ | KHZ | MHZ }
The FREQINT f
to 6 digits or 0.1 mHz, whichever is greater. The value of f is limited to 1 mHz ≤ f ≤
4 MHz.
The query form,
Example
FREQINT 12.34E3
FREQINT 12.34 KHZ
FREQINT 12340
FREQINT?
FREQEXT?
The FREQEXT?
Example
FREQEXT?
FREQDET?
The FREQDET?
reference mode or harmonic detection. Otherwise, the detection frequency is either the
internal or external reference frequency.
Example
FREQDET?
HARM(?) { i }
The HARM i
frequency. The value of i is limited to 1 ≤ i ≤ 99.
Example
HARM 2
HARM?
HARMDUAL(?) { i }
The HARMDUAL i
external frequency in dual reference mode. The value of i is limited to 1 ≤ i ≤ 99. The
actual detection frequency, when operating in dual reference mode, is
Set the internal frequency to 12.34 kHz
Returns the internal (or external) frequency in Hz
command sets the internal frequency to f. The value of f will be rounded
, always returns the internal reference frequency.
FREQINT?
Set the internal frequency to 12.34 kHz
Returns the internal frequency in Hz
query returns the external reference frequency.
Returns the external frequency in Hz
query returns the actual detection frequency. This is helpful in dual
Returns the detection frequency in Hz
command will set the lock-in to detect at the i
Set the harmonic detect to 2
Returns the harmonic number i
command will set the lock-in to detect at the i
u 
f i f
detect HARM int
u
i f
HARMDUAL ext
Programming
th
harmonic of the reference
th
harmonic of the
SR865A DSP Lock-in Amplifier
107