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Table
3.1
-
Front Panel
Controls,
Indicators,
and Connectors
(Cont'd)
Reference
Item
Function /Description
(6
A)
Mantissa Display
LEDs*
Display
9-digit
mantissa
(6B)
Exponent
Display
LED*
One-digit
exponent
number
©
Exponent
Sign
LED*
Negative exponent
(!)
O/F
LED*
Readout
overflows
the ninth
digit
of the
display.
With
10s or
greater gate times,
multiple
overflows are
possible
GPIB LEDs:
REM
LED*
I
Counter under
remote
control over the
GPEB
interface
(**)
ADDR
LED*
Counter
is
being addressed as
either
a
talker or listener
over the
GPIB
inter-
face
SRQ LED*
Counter has transmitted a
service
request over the
GPIB
interface
(!)
EXT
ARM
LED*
External
arming
or
gating
(Special
Func-
tions
11-18)
is
controlling
the
measure-
ment
0
EXT STD
LED*
Counter
is
operating
from an
external
frequency standard reference
3-6
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