VTI Instruments Metek EX1202 - Page 75

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Basic EX1200 DMM Operation 75
IDLE
IDLE
LAYER
ARM
LAYER
TRIG
LAYER
INIT
LAYER
DEVICE
LAYER
INIT CONT?
No
INIT
Yes
Wait for
ARM Event
ARM Delay
ARM Event
ARM:Count > 0
or
ARM INF?
No
Yes
SW ARM
Decrement
ARM:COUNT
No
Yes
TRIG:Count > 0
or
TRIG INF?
No
Wait for
TRIG Event
TRIG Delay
TRIG Event
SW TRIG
TRIG INF?
Yes
Yes
Decrement
TRIG:COUNT
No
SAMP:Count > 0
or
SAMP INF?
Yes
No
Acquire ADC
Counts
Calibrate
Reading
SAMP Event
SAMPLE Delay
AUTO RANGE?
and
HW OVERFLOW?
and not
RANGE MAX?
No
Range Up
Range Delay
Yes
Range Down
AUTO RANGE?
and
UNDER LIMIT?
and not
RANGE MIN?
AUTO RANGE?
and
OVER LIMIT?
and not
RANGE MAX?
Yes
No
Yes
Store Reading
INITILIZED = 0
ARM ACTIVE = 0
TRIG ACTIVE = 0
SAMP ACTIVE = 0
DEVICE ACTIVE = 0
ABORT
(From any layer)
INITILIZED = 1
ARM ACTIVE = 0
TRIG ACTIVE = 0
SAMP ACTIVE = 0
DEVICE ACTIVE = 0
INITILIZED = 1
ARM ACTIVE = 1
TRIG ACTIVE = 0
SAMP ACTIVE = 0
DEVICE ACTIVE = 0
INITILIZED = 1
ARM ACTIVE = 0
TRIG ACTIVE = 1
SAMP ACTIVE = 0
DEVICE ACTIVE = 0
INITILIZED = 1
ARM ACTIVE = 0
TRIG ACTIVE = 0
SAMP ACTIVE = 0
DEVICE ACTIVE = 1
Trigger Model Status
ARM IMM
TRIG IMM
ARM INF?
No
SAMP
LAYER
INITILIZED = 1
ARM ACTIVE = 0
TRIG ACTIVE = 0
SAMP ACTIVE = 1
DEVICE ACTIVE = 0
Wait for
SAMP Event
SW SAMP
SAMP IMM
SAMP INF?
Decrement
SAMP:COUNT
No
Yes
FIGURE 4-3: TRIGGER MODEL