Stanford Research Systems SR865A, Руководство по эксплуатации

Страница: 148 / 221

130 Programming Chapter 4
SR865A DSP Lock-in Amplifier
SCNENBL 1
SCNENBL?
Returns the scanning off/on state i
SCNRUN
The SCNRUN command starts or resumes the scan. This command has no effect if the
scan is already running.
SCNPAUSE
The
SCNPAUSE
command pauses the scan. This command has no effect if the scan is
already paused.
SCNRST
The SCNRST command resets the scan, regardless of its current state (running or
paused). This sets the scan parameter to its begin value but does not start a scan.
SCNSTATE?
The SCNSTATE? query returns the current state of the scan, off or disabled (0), reset (1),
running (2), paused (3) or done (4). This is a query only command.
SCNFREQ(?) [ BEGin | END | j ] { , f { HZ | KHZ | MHZ } }
The SCNFREQ j, f command sets the begin (j=0) or end (j=1) frequency to f. The value
of f will be rounded to 6 digits or 0.1 mHz, whichever is greater. The value of f is limited
to 1 mHz
≤ f ≤ 4 MHz.
Example
SCNFREQ BEG, 1234 Set the begin frequency to 1.234 kHz
SCNFREQ 0, 1.234 KHZ
SCNFREQ? 0
Returns the begin frequency
SCNAMP(?) [ BEGin | END | j ] { , v { NV | UV | MV | V } }
The
SCNAMP j, v
command sets the begin (j=0) or end (j=1) ref amplitude to v. The
value of v will be rounded to 3 digits or 1 nV, whichever is greater. The value of v is
limited to 1
nV ≤ v ≤ 2.0 V.
Example
SCNAMP END, 1.23 Set the end reference amplitude to 1.23 V
SCNAMP 1, 1230 MV
SCNAMP? 1
Returns the end reference amplitude
SCNDC(?) [ BEGin | END | j ] { , v { NV | UV | MV | V } }
The SCNDC j, v command sets the begin (j=0) or end (j=1) ref dc level to v. The value of
v will be rounded to 3 digits or 0.1 mV, whichever is greater. The levels may be
programmed from
−5.00 V to +5.00 V.
Example
SCNDC BEGIN, -1.23 Set the begin reference dc level to − 1.23 V
SCNDC 0, -1230 MV