Index Of Commands - Stanford Research Systems SR844 User Manual

4-2

Index of Commands

Index of Commands
Variables
ch
i,j,k,l,m,n,q
f
x,y,z
Syntax
(?)
var
{var}
[var]
Reference and Phase
FMOD(?){i}
HARM(?){i}
FREQ(?){f}
FRAQ?
FRIQ?
PHAS(?){x}
APHS
REFZ(?){i}
Signal Input
WRSV(?){i}
AWRS
INPZ(?){i}
Gain and Time Constant
SENS(?){i}
AGAN
CRSV(?){i}
ACRS
OFLT(?){i}
OFSL(?){i}
SETL(?)
SR844 RF Lock-In Amplifier
output channel (1=CH1, 2=CH2)
integers
real number frequency in Hz
real numbers
required for queries only - illegal for set
always required
required for sets only - illegal for query
optional for set and query
4-11 Set (Query) the Reference Mode to External (0) or Internal (1).
4-11 Set (Query) the 2F detect Mode to Off (0) or On (1).
4-11 Set (Query) the Reference Frequency to f Hz. Set allowed only in
Internal Reference mode.
4-11 Query the Reference Frequency to 6 or 7 digits precision in Hz.
4-11 Query the IF frequency. Returns an integer number of Hz.
4-11 Set (Query) the Reference Phase to x degrees.
4-20 Perform AutoPhase function.
4-11 Set (Query) the Reference Input impedance to 50
4-12 Set (Query) the Wide Reserve Mode to High Reserve (0), Normal (1), or
Low Noise (2).
4-20 Automatically set Wide Reserve Mode.
4-12 Set (Query) the Signal Input Impedance to 50
4-13 Set (Query) the Sensitivity to 100 nV (0) through 1 V (14) rms full-
scale.
4-20 Perform Auto Sensitivity.
4-13 Set (Query) the Close Dynamic Reserve Mode to High Reserve (0),
Normal (1) or Low Noise (2).
4-20 Automatically set Close Reserve Mode.
4-13 Set (Query) the Time Constant to 100
4-13 Set (Query) the Time Constant Filter Slope to 6 (i=1), 12 (2), 18 (3),
24 (4) dB/oct, or NoFilter Mode (i=0).
4-14 Reset Elapsed Time counter to zero, return elapsed T.C.'s.
Ω
(0) or 10 k
Ω Ω
(0) or 1 M (1).
µ
s (0) through 30 ks (17).
Ω
(1).