Front Panel Operation
4-15
Arm layer
NOTE
The arm layer is programmed from
the SETUP ARM CONTROL menu
(see paragraph 4.8.3).
In general, the instrument requires an arm event to al-
low operation to proceed to the next layer (scan layer).
With Immediate arm spacing selected, operation im-
mediately proceeds to the next layer when the instru-
ment is taken out of the idle state. RESET and factory
defaults set arm spacing to Immediate. With one of the
other arm spacing events selected, the instrument will
wait until the appropriate event occurs.
With Manual arm spacing selected, the instrument will
wait until the front panel STEP key is pressed. With
GPIB arm spacing selected, the instrument will wait
until a bus trigger is received (GET or *TRG). With Ex-
ternal arm spacing selected, the instrument will wait
until an input trigger (via EXTERNAL TRIGGER con-
nector on rear panel) is received. With TrigLink (Trig-
ger Link) arm spacing selected, the instrument will
wait until an input trigger is received (via TRIGGER
LINK). With Hold arm spacing selected, the instru-
ment will not respond to any of the arm spacing events.
As can be seen in the flowchart, there is a path that al-
lows operation to loop around the programmed spac-
ing event. This path is called the Source Bypass. When
the Source Bypass is enabled (Arm Trigger Control set
to Source) and External or TrigLink arm spacing is se-
lected, operation will loop around the spacing event on
the initial pass through the arm layer. If programmed
for another arm (arm count >1), the bypass loop will
not be in effect even though it will be enabled. The
Source Bypass loop will reset (be in effect ) when oper-
ation goes into Idle.
Enabling the Source Bypass also enables the Output
Trigger in this layer. When operation returns to the arm
layer from the scan layer, an output trigger pulse will
occur. If TrigLink arm spacing is selected, the output
trigger pulse will be available on the programmed
TRIGGER LINK output line. For all other arm spacing
selections, the output trigger pulse will be available at
the CHANNEL READY connector. The output trigger
for this layer is disabled when the Source Bypass is dis-
abled (Arm Trigger Control set to Acceptor). RESET
and factory defaults set Arm Trigger Control to Accep-
tor.
The instrument can be programmed for additional
arms. The arm count can be set to infinity or to a finite
value (1 to 9999). RESET and factory defaults set arm
count to 1.
After leaving the arm layer, operation proceeds into the
scan layer.
Scan layer
NOTE
The scan layer is programmed from
the SCAN CONTROL menu (see para-
graph 4.8.2).
Operation in the scan layer is similar to operation in the
arm layer, except that spacing is controlled by scan
events rather than arm events. A timer is available in
this layer to control scan spacing. When Timer scan
spacing is selected, operation will immediately pro-
ceed into the channel layer on the initial pass through
the scan layer. Each additional scan (1 to 9999 or infi-
nite) will not occur until the programmed timer inter-
val elapses. The timer can be set to an interval from
1msec to 99999.999 seconds.
The Source Bypass and Output Trigger function in the
same manner as the Source Bypass and Output Trigger
in the arm layer. The Source Bypass (if enabled) will re-
set (back in effect) after all programmed scans are com-
pleted.
RESET and factory defaults set scan spacing to Imme-
diate, scan count to infinite and Scan Trigger Control to
Acceptor.
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