Ametek 7124 Instruction Manual page 174

Chapter 6, COMPUTER OPERATION
TRIGOUT [n]
TRIGOUTPOL [n]
EVENT [n]
HC
M
6-28
Curve buffer trigger output
The value of n defines the type of trigger output generated when a buffer acquisition
is run in accordance with the following table:
n Trigger
0 Trigger generated once per curve, at start of curve
1 Trigger generated once per point
Curve buffer trigger output polarity
The value of n defines the polarity of the trigger output generated when a buffer
acquisition is run in accordance with the following table:
n Trigger Output
0 Rising-edge
1 Falling edge
Event marker control
During a curve acquisition into the standard curve buffer, if bit 13 in the CBD
command has been asserted, the lock-in amplifier stores the value of the Event
variable at each sample point. This can be used as a marker indicating the point at
which an experimental parameter was changed. The EVENT command is used to set
this variable to any value between 0 and 32767.
Halt curve acquisition
Halts curve acquisition in progress. It is effective during both single (data acquisition
initiated by TD command) and continuous (data acquisition initiated by TDC
command) curve acquisitions. The curve may be restarted by means of the TD, TDT
or TDC command, as appropriate. If an oscillator frequency and/or amplitude sweep
has been defined and linked to the curve buffer using the SWEEP command with a
parameter of 9, 10 or 10, then this sweep will be stopped as well.
Curve acquisition status monitor
Causes the lock-in amplifier to respond with four values that provide information
concerning data acquisition, as follows:
First value, Curve Acquisition Status: a number with five possible values, defined
by the following table:
First Value Significance
0 No curve activity in progress.
1 Acquisition via TD command in progress and running.
2 Acquisition via TDC command in progress and running.
5 Acquisition via TD command in progress but halted by HC
command.
6 Acquisition via TDC command in progress but halted by
HC command.
Second value, Number of Sweeps Acquired: This number is incremented each
time a TD is completed and each time a full cycle is completed on a TDC
acquisition. It is zeroed by the NC command and also whenever a CBD or LEN
command is applied without parameters.
Third value, Status Byte: The same as the response to the ST command. The
number returned is the decimal equivalent of the status byte and refers to the
previously applied command.