Notes
1. When
TRIGger:SOURce
is not
TIMer
or
IMMediate
with
INITiate:CONTinuous ON
,
ARM:SOURce
must be set to
IMMediate
(the
*RST
condition). If not, the
INITiate
command will generate
Error -221, “Settings conflict” .
2. When
TRIGger:SOURce
is
TIMer
, the trigger timer interval
(
TRIGger:TIMer <
interval
>
) must allow enough time to scan all
channels (
ROUTe:SEQuence:DEFine
) in the active scan list
(
ROUTe:SCAN
) or a +3012, “ Trigger Too Fast” error will be generated
during the measurement scan. See the Command Reference for
TRIGger:TIMer[:PERiod]
or
SAMPle:TIMer
for timing details.
To set the Trigger Source to a software trigger (
TRIGger:IMMediate
, or
*TRG
):
TRIG:SOUR HOLD
Trigger on TRIG or *TRG.
To set the trigger source to the external trigger input connection:
TRIG:SOUR EXT
An external trigger signal.
To set the trigger source to the internal trigger interval timer:
TRIG:SOUR TIM
Now select ARM:SOURce.
Selecting Timer
and Continuous
Mode Arm Source
Figure 3-4 shows that when the
TRIGger:SOURce
is
TIMer
, or
IMMediate
with
INITiate:CONTinuous ON
, the other trigger sources become arm
sources and control when the timer will start or scanning will begin. The
command to select the arm source is
ARM:SOURce <
source
>
.
•
The
<
source
>
parameter choices are explained in the following table.
Parameter Value
Source of Arm (after INITiate:
…
command)
BUS
ARM[:IMMediate]
EXTernal
“Trig” signal input on terminal module
HOLD
ARM[:IMMediate]
IMMediate
The arm signal is always true (scan starts when an
INITiate:
…
command is received).
SCP
SCP Trigger Bus (future HP or SCP Breadboard)
TTLTrg<
n
>
The VXIbus TTLTRG lines (<
n
> = 0 through 7)
Note
When
TRIGger:SOURce
is not
TIMer
, or
IMMediate
with
INITiate:CONTinuous ON
,
ARM:SOURce
must be set to
IMMediate
(the
*RST
condition). If not, the
INITiate
command will generate Error -221,
“ Settings conflict” .
Chapter 3
Using the HP E1313/E1413 87
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