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With the Timer control source selected
(:ARM:LAYer2SOURce TIMer), operation will immedi-
ately proceed into the channel layer on the initial pass
through Arm Layer 2. Each additional scan will not occur
until the programmed timer interval elapses. The timer can
be set to an interval from 1msec to 999999.999 seconds.
With the Manual control source selected
(:ARM:LAYer2:SOURce MANual), the instrument will
wait until the front panel STEP key is pressed. Note that the
Model 7001 must be taken out of remote (press LOCAL key
or send LOCAL 707 over bus) before it will respond to the
STEP key. With the Bus control source selected
(:ARM:LAYer2:SOURce BUS), the instrument will wait un-
til a bus trigger is received (GET or *TRG). With the Exter-
nal control source selected (:ARM:LAYer2:SOURce
EXTernal), the instrument will wait until an input trigger
(via EXTERNAL TRIGGER connector on rear panel) is re-
ceived. With the Trigger Link control source selected
(:ARM:LAYer2:SOURce TLINk), the instrument will wait
until an input trigger is received (via TRIGGER LINK). With
the Hold control source selected (:ARM:LAYer2:SOURce
HOLD), the instrument will not respond to any of the con-
trol source events.
After the programmed scan event is detected, the instrument
will wait for the programmed Delay to time out. The
:ARM:LAYer2:DELay <n> command is used to set the De-
lay (where n = 0 to 999999.999 seconds). The *RST and
:SYSTem:PRESet commands set the Delay to zero seconds.
As can be seen in the flowchart, there are three paths that al-
low operation to loop around the control source. Two of these
paths also loop around the Delay. These three paths are de-
scribed as follows:
1. When the Source Bypass is enabled (:ARM:TCONfig-
ure:DIRection SOURce) and the External or Trigger
Link control source is selected, operation will loop
around the control source on the initial pass through arm
layer 2. If programmed for another scan (scan count >
1), the bypass loop will not be in effect even though it
will still be enabled. The Source Bypass loop will reset
(be in effect) if operation goes back into arm layer 1.
Enabling the Source Bypass also enables the Output
Trigger. When operation returns to arm layer 2 from the
trigger layer, an output trigger pulse will occur. If the
Trigger Link control source is selected, the output trig-
ger pulse will be available on the programmed TRIG-
GER LINK output line. For all other control source
selections, the output trigger pulse will be available at
the CHANNEL READY connector. The Output Trigger
in this layer is disabled when the Source Bypass is dis-
abled (:ARM:TCONfigure:DIRection ACCeptor).
2. Each time the :ARM:LAYer2:IMMediate command is
sent, operation will loop around the scan control source
and the Delay. It is used when you do not wish to wait
for a programmed scan event to occur (or when the Hold
control source is selected).
3. Each time the :ARM:LAYer2:SIGNal command is sent,
operation will loop around the scan control source. This
path functions the same as :ARM:LAYer2:IMMediate
except that it does not loop around the Delay.
After all other operations in the next layer have been com-
pleted, the instrument can be returned to Arm Layer 2 by pro-
gramming the instrument for additional scans. The
:ARM:LAYer2:COUNt <n> command can be used to set
the scan count to a finite value (where <n> = 1 to 9999) or
for an infinite (<n> = INF) number of scans. The *RST com-
mand sets the scan count to one and the :SYSTem:PRESet
command sets the scan count to infinite.
After the instrument leaves arm layer 2, operation proceeds
to the Channel Layer (Trigger Layer).
Trigger layer
NOTE
For front panel operation, this layer is
called the channel layer.
In general, measure events control the channel scan rate.
With the Immediate control source selected (:TRIG-
ger:SOURce IMMediate), operation immediately proceeds
to the Delay. The *RST command also sets the measure con-
trol source to Immediate. With one of the other control sourc-
es selected, the instrument will wait until the appropriate
event occurs.
With the Timer control source selected (:TRIGger :SOURce
TIMer), the first channel will be scanned immediately. Each
additional will be scanned at a rate determined by the pro-
grammed timer interval (1msec to 999999.999 seconds).
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