Stanford Research Systems SR844, Руководство пользователя

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