The Measuring-time cursor on the display will indicate
0.2 s for all programmed Measuring-times except SIN-
GLE, which will be indicated as usual.
Selecting Triggering
The trigger level can be selected in the same way as
from the front panel.
Trigger-level
offset Code Comment
Auto TLO AUT Default
TLO POS
TLO SYM
TLO NEG
The trigger-level cursor on the front panel willindicate the
setting.
Trigger slope Command Comment
Positive TRGSLP POS Default
Negative TRGSLP NEG Negative slope is only
available via the bus
and is used when you
want to measure the
negative Pulse-width.
When the counter switches to local, the trigger slope will
switch back to positive. Trigger slope is not indicated on
the display.
Totalize Start/Stop
When TOT A is selected, the gate is opened and closed
by the controller instead of by pressing the button on the
front panel. To start the counting after selecting TOTM A,
the gate must be opened.
Totalize Command Comment
Start GATE OPEN Starts counting.
Stop GATE CLOSE Stops counting.
Default.
NOTE: Multiple GATE OPEN/GATE CLOSE will accu-
mulate the results in the counting registers.
Any other command but GATE OPEN/GATE
CLOSE will stop the totalizing and reset the
counting registers to zero.
Free-Run/Triggered
The counter can work in two different ways:
1. Free-Run, where it starts a new measurement as
soon as the previous measurement is finished.
The first measuring result that is ready after the
counter receives a read command, will be sent
to the controller. When the result has been read,
the output buffer is reset to zero until a new re-
sult is ready. One and the same measuring re-
sult can only be read once.
2. Triggered, where the counter waits for trigger com-
mand GET or ’X’ from the controller before it
starts a measurement. When the measurement
is completed, the counter will wait until the con-
troller reads the measuring results, then the out-
put buffer is reset. The function is the same as
when Displ Hold is selected from the front panel
and you start a new measurement by pressing
the reset button.
Free-Run Command Comment
Off FRUN OFF This function is sometimes
called Triggered-Mode, so the
TRIG ON command will also
result in the same function.
On FRUN ON TRIG OFF gives the same
result. Default.
Free-Run ON or OFF will not be indicated on the dis-
play. When the counter switches to LOCAL, Free-Run
will always be ON but when the counter switches back
to remote, it will return to its previously programmed set-
tings.
Time-Out
When Free-Run is switched off it is possible to set a
time-limit (time-out) between the start of a measurement
and the time when a result is expected to be ready. If no
result is achieved before the set time is out, the counter
can output a Service Request, SRQ. Time-Out must be
selected in the SRQ-mask; see ’Service Request’. The
programming command is TOUT <number>. The timeout
can be set to any value between 100 ms and 25.5 s, the
minimum increment is 100 ms.
Time-Out Command Comment
100 ms TOUT 0.1 Time-Out is only intended to
be used with Free-Run off*.
Off TOUT 0 Always send this command
when Free-Run is switched
on. Default.
Time-Out is not indicated on the display. When the
counter switches to LOCAL, Time-Out is off, but when
switched to remote again, the set Time-Out will be active
again.
* Time-out can be switched on when free-run is on but
it will not serve any purpose.
GPIB-INTERFACE OPERATION Page: 25
PM 6669 - OPERATORS MANUAL
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