Stanford Research Systems SR865 Operation Manual page 155

Chapter 4
Example
CAPTURERATE 4
CAPTURERATE?
CAPTURESTART [ ONEshot | CONTinuous | i ] , [ OFF | ON | j ]
The
CAPTURESTART i, j
Continiuous (i=1) mode. The parameter j selects whether capture starts immediately
(hardware trigger OFF, j=0) or waits for a trigger (hardware trigger ON, j=1).
The hardware trigger is a TTL input on the rear panel. A falling edge triggers the
beginning of capture. When operating in
capture and hardware trigger), the capture will be stopped when the TTL input returns
high or by receiving the
Both parameters i and j are required in this command.
This command clears any previously captured data and starts a new capture.
When operating in
trigger), the capture will be stopped when the TTL input returns high or by receiving the
CAPTURESTOP
Example
CAPTURESTART ONE, OFF
CAPTURESTART 0, 0
CAPTURESTOP
The
CAPTURESTOP
If the capture is waiting for a hardware trigger, then the capture is aborted and the trigger
will be ignored.
If capture is in progress, then capture is halted. Any data already captured is preserved
and may be read. Capture is stopped at the next 2 kbyte boundary (512 total data points).
Example
CAPTURESTOP
CAPTURESTAT?
The
CAPTURESTAT?
command.
The returned integer is a 3-bit binary encoded word
Sets the capture rate to the max rate divided by 2
Returns the actual capture rate in Hz
command starts data capture in either OneShot (i=0) or
CAPTURESTOP
CAPTURESTART 1,1
command.
command stops data capture.
Stop data capture at the next 2 kB boundary
query returns the data capture state. This is a query only
Bit Weight Definition
0 1 Capture currently in progress
1 2 Capture triggered, either by
TTL or remote command
2 4 Capture wrapped
CAPTURESTART 1,1
command.
mode (Continuous capture and hardware
Starts OneShot capture immediately
Programming
4
mode (Continuous
SR865 DSP Lock-in Amplifier
137