Fluke 8588A Operator's Manual page 111

•
Manual: Push  to satisfy the Event. Manual is not the same as pushing
 since Manual is an event setting for the Arm2, Arm1 and Trigger
layers, whereas  affects the Initiate layer. The behavior of is
different in Manual than it is when  is pushed to set the Initiate layer
to Continuous OFF. If the Product is in the Idle state, where the Initiate layer
is set to Continuous OFF, and the Trigger layer is set to Manual, the first
push of  causes the system to exit from Idle. A second  push is
required to satisfy the Trigger Event, and then a reading is taken.
•
Synchronous - Remote control only. The Event is satisfied when the Product
output buffer is empty and the Product requests data.
•
Timer: Waits until the Timer period has elapsed. Allows the Trigger
subsystem to make readings at a specific time interval. On the first pass
through the event detector that is set to Timer, Timer acts like Immediate, that
is, the process does not wait at the event detector. If Count at that layer is
greater than one, on the second and subsequent loops, the process will wait
at the event detector until the Timer period has elapsed. This behavior allows
Timer to space readings with a specific time interval, where the first reading
comes "immediately" and subsequent readings are at the specified Timer
interval. If the Timer interval is less than the time the process takes to return
to the detector, there is no wait. The Timer interval is reset as the process
exits that layer on the upward path. There is one exception to this rule: If
Continuous is ON and all layers above the layer with event Timer have event
set to Immediate, the Timer is not reset. Readings will occur at the specified
Timer interval as if that layer had an infinite Count. An example is to set the
Trigger layer event to Timer, with a 10 second interval, leaving the other two
layers above it in their default event state of Immediate. With this triggering
setup, the first reading comes "immediately" and subsequent readings are
spaced 10 seconds apart.
From the point of view of the front panel user, only Immediate, External, Internal,
Line, Manual, and Timer event settings are relevant, as all the others involve
remote interface activity.
Along with settable triggering events, Arm2, Arm1 and Trigger layers each has a
Loop Counter (Count) of how many times the layer will repeat. These counts
nest, such that the full Trigger layer Count will occur for each Arm1 layer Count,
and so on. The total number of measurements made will be the product of the
Count values of all three layers.
Each layer has an Event Counter (ECount) value, which requires the specified
event to occur that number of times before the Trigger subsystem reaches the
Delay block in that layer.
Each layer has a Delay value to insert a specific pause after the event in that
layer has been satisfied. These delays default to "Auto" which, from the
perspective of the front panel user, can be treated as zero.
Reference Multimeter and 8 ½ Digit Multimeter
Triggering Measurements
107