Stanford Research Systems SR844, User Manual

Page: 106 / 246

4-4 Index of Commands
SR844 RF Lock-In Amplifier
Data Storage
SRAT(?){i}
4-24 Set (Query) the Data Sample Rate to 62.5 mHz (
0
) through 512 Hz (
13
)
or Trigger (
14
).
SEND(?){i}
4-24 Set (Query) the End of Scan mode to One–Shot (
0
) or Loop (
1
).
TRIG
4-24 Sample trigger command. Same as trigger input.
TSTR(?){i}
4-24 Set (Query) the Trigger Starts Scan mode to No (
0
) or Yes (
1
).
STRT
4-24 Start or continue a scan.
PAUS
4-24 Pause during a scan. Does not reset a paused or done scan.
REST
4-24 Reset the scan. All stored data is lost.
Data Transfer
OUTP?i
4-25
Query the value of X (
1
), Y (
2
), R[V] (
3
), R[dBm] (
4
) or
θ
(
5
).
OUTR?ch
4-25 Query the value of Display
ch
(
1
,
2
).
SNAP?i,j{,k,l,
m,n}
4-25 Query the value of 2 to 6 parameters simultaneously.
SPTS?
4-26 Query the number of points stored in the Display buffer.
TRCA? ch,j,k
4-26
Read
k
≥
1
points starting at bin
j
≥
0
from Display
ch
(
1
,
2
) buffer in
ASCII floating point.
TRCB? ch,j,k
4-26
Read
k
≥
1
points starting at bin
j
≥
0
from Display
ch
(
1
,
2
) buffer in
IEEE binary floating point.
TRCL? ch,j,k
4-27
Read
k
≥
1
points starting at bin
j
≥
0
from Display
ch
(
1
,
2
) buffer in
non-normalized binary floating point.
FAST(?){i}
4-28 Set (Query) Fast Data Transfer mode to Off (
0
) or On(
1
). Fast mode
will transfer binary X and Y every sample during a scan over GPIB.
STRD
4-28 Start a Scan after 0.5 s delay. Use with Fast Data Transfer mode.
Interface
*RST
4-29 Reset the SR844 to its default configuration.
PRST
4-29 Power-On reset of SR844.
*IDN?
4-29 Read the SR844 device identification string.
LOCL(?){i}
4-29 Set (Query) the Local/Remote state to Local (
0
), Remote (
1
) or Local
Lockout (
2
).
OVRM(?){i}
4-29 Set (Query) the Override Remote mode to Off (
0
) or On (
1
).
Status
*CLS
4-30 Clear all status bytes.
*STB?[i]
4-30 Query the Serial Poll Status Byte. If
i
is included only bit
i
is queried.
*SRE(?)[i,]{j}
4-30
*SREj
sets the Serial Poll Enable Register to the decimal value
j
(
0
–
255
).
*SREi,j
sets bit
i
(
0
–
7
) to
j
(
0
,
1
).
*SRE?
queries the
entire register.
*SRE?i
queries bit
i
.
*ESR?[i]
4-30 Query the Standard Event Status Byte. If
i
is included only bit
i
is
queried.
*ESE(?)[i,]{j}
4-30
*ESEj
sets the Standard Event Status Enable Register to decimal value
j
(
0
–
255
).
*ESEi,j
sets bit
i
(
0
–
7
) to
j
(
0
,
1
).
*ESE?
queries
the entire register.
*ESE?i
queries bit
i
.
*PSC(?){i}
4-30 Set (Query) the Power–On Status Clear bit to Set (
1
) or Clear (
0
).