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1.17
SPECIFICATIONS
1.17.1
Table
1.1
lists
the
1994
specifications.
They
specify the
performance
standards
to
which
the
instrument should be
tested
during any necessary
calibration
and/or
servicing.
Table
1.1
-
1994
Specifications
GENERAL
DESCRIPTION
The
1994
universal
counter provides the
following
measurement
functions:
frequency,
frequency
ratio,
period,
high-resolution
time
interval,
rise/fall
time,
pulse
width,
phase,
and
totalize.
A
full
talker/listener
GPIB
is
a standard feature.
Supplemental
features include
mathematical manipulation
of
measurements, averaging
of 100
readings,
peak amplitude measurement, and
a high-speed "raw"
data output
via
the
GPIB.
The
frequency range on
Inputs
A
and
B
is
DC
to
160
MHz;
40
MHz
to 1.3
GHz
on
Input
C
using a plug-
in
option board.
Single-shot
time
interval resolution
is
1
nanosecond
or
9
digits
per
second
of
measurement
time.
Trigger
levels
on
Inputs
A
and
B
can be
set via
the front-panel
keypad
or via
auto-
trigger
at the
50%
point of the input
waveform.
Trigger
levels
can be
shown
on
the
main
display.
A
full
range of
options support the
1994
including
rear-panel
inputs
(Option
01),
precision
ovenized
oscillators
(Options 04 A,
04E),
external frequency standard
multiplier (Option
10),
1.3
GHz
Input
C
(Option
41),
fixed
rack
mount
(Option
60),
and
slide
rack
mount
(Option
65).
The 1994
is
housed
in
a
3.5-inch, full-width
rack
chassis.
INPUT CHARACTERISTICS
Inputs
A
and
B
Frequency Range:
DC
Coupled
0
to
100
MHz
AC
Coupled
10
Hz
to
100
MHz
Note:
Input
A
frequency range
is
0
to
160
MHz
in
the
frequency
mode.
Input
Impedance
(XI, X10):
High,
Separate
1
MU
shunted by
45
pF
(nominal)
High,
Common
1
MU
shunted by
55
pF
(nominal)
50U, Separate
and
Common
SOU
(nominal)
Sensitivity,
Sine
Wave
(XI):
25
mV
rms
to
100
MHz
50
mV
rms
to
160
MHz
(Input
A
Frequency
mode
only)
1-6
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