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Table
3.1
- Front Panel
Controls, Indicators,
and Connectors
(Cont'd)
Reference
Item
Function /Descript
ion
TRIG
LEDs/Inputs
A
and
B
Tri-state
LEDs
indicating the counter's
trigger status:
a.
LED
Off-level too
low
b.
LED
Flashing-triggering
c.
LED
On-level
too high
INPUT(s)
A
and B
BNC
connectors
for
INPUT(s)
A
and
B.
INPUT A
(DC
to
160
MHz)
is
used
for
all
functions
except Frequency
C
(Option
41).
INPUT
B
(DC
to
100
MHz)
is
used
with
INPUT
A
for
Time
Interval,
Ratio
A/B,
Totalize,
and Phase measure-
ments,
Input
B
is
used with
INPUT
C
for
Ratio C/B.
Special
Function
21
internally
exchanges
INPUTs
A
and
B
(providing,
e.g.,
PERIOD
B,
etc.
measurement
capability)
INPUT
C
(Option
41)
BNC
connector
for
high-frequency
INPUT C
(40
MHz
to
1.3
GHz
range).
INPUT C
is
used with
INPUT
B
for
Ratio
C/B.
Special
Function
21
provides
Ratio
C/A
capability.
Protection against
excessive
signal levels
(>5V rms)
is
provided by a
fuse
in
the input
socket
3-15
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