Timer Paced Scans
In this mode the Trigger Timer triggers each execution of a scan list. The
trigger timer (t
p
) can be set from .1 ms up to 6.5 seconds. Of course, t
p
must
allow time for all channels to be scanned before the next timer trigger;
t
p
>
(
channel count
+
3
)
∗
t
c
+
30
µ
s. The sample timer controls t
c
in the
range from 10
µ
s to 32 ms.
The
TRIGger:COUNt
command controls the number of times any trigger will
be accepted, from
1
to
32767
or
INFinite
. When the trigger count is exhausted,
the module stops scanning until another
INITiate
-
ARM
-
TRIGger
sequence is
executed. Trigger count defaults to 1.
Example Command Sequence
ROUT:SEQ:DEF LIST<
n
>,(@101,103,105,107)
<n> can be 1 - 4.
ROUT:SCAN LIST<
n
>
<n> can be 1 - 4.
SAMP:TIM LIST<
n
>,<
t
c
>
<t
c
> can be 10
µ
s to 32.768ms.
TRIG:SOUR TIM
TRIG:TIM:PER <
t
p
>
<t
p
> can be .1ms - 6.5536 s.
TRIG:COUN <
count
>
<count> can be 1 - 32768 or INF.
ARM:SOUR <
source
>
<source> can be BUS, EXT, HOLD,
IMM, or TTLTrg0 - TTLTrg7.
INIT:IMM
Starting
ARM event, either hardware or software
Acquisition starts
Stopping Before Trigger Count is Reached
TRIG:SOUR HOLD
Stops at end of scan list, still
initiated.
TRIG:IMM
One more scan, now idle.
or
ABORt
Stops immediately (must use
ABOR if TRIG:COUNt is INF).
t
c
t
p
t
c
is the sample time between channels.
t
p
is the pacing time between channel lists.
The large arrow is the pacing Trigger Timer. The smaller arrows are sample
triggers generated by the HP E1313/E1413 when stepping through the
channel list. The first large arrow is the arming event.
Channel Number
=Trigger Count
112 Understanding the HP E1313/E1413
Chapter 4
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