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8842A
Instruction Manual
2-6
M
TRIG triggers a new reading.
Enabled in external trigger mode.
EXT TRIG toggles between internal
and external trigger modes
RATE cycles between slow, medium and
fast reading rates. Automatically
selects the optimum filter for each
reading rate.
SRQ generates a service request over the IEEE-
488 bus if enabled by the SRQ mask (IEEE-488
Interface option only). When pressed for 3
seconds, SRQ initiates diagnostic self-tests.
NOTE: Leave inputs disconnected during self-
tests or the 8842A may indicate errors.
OFFSET stores the displayed reading as an
offset, which the 8842A subtracts from all
subsequent readings in the function
presently selected. Readings in the other
functions remain unaffected. Pressing
OFFSET again cancels the offset, or stores
a new offset if in a different function.
If the 8842A is in remote, LOCAL returns it to
local control. If the 8842A is in local, the
LOCAL button causes the 8842A to display its
bus address for two and one half seconds.
Ignored if the IEE-488 Interface is not
installed.
Self-Test
Enabled
Calibration Mode Enabled
Error Condition
Overrange
Autorange On
Offset On
Function
and Units
Annunciators
Reading Rate Slow, Medium
and Fast. Blinks off when a
reading is triggered.
External Trigger
Mode Enabled
IEEE-488 Interface
Annunciators
f2-05_2.wmf
Figure 2-5. Front Panel Features (cont)