HM8122 17
Universal Counter HM 8122
■
Frequency Range 0 - 1600 MHz; 3 Inputs
■
9 Measurement Functions; Ext. Gate and Arming
■
Up to 8-digit Resolution at 1 second Gate Time
■
100 MHz Time Base with 0.5ppm Stability
■
IEEE-488 Bus or RS-232 Interface, optional
The
HM8122
is a feature-packed Universal
Counter and, like all other instruments in the
8100
Series
, prepared for operation in automated test
systems as well as for laboratory bench- top
measurements. The instrument has three highly
sensitive inputs and provides signal measurement
capability from
DC
to
1.6 GHz
.
An impressive
10ns
resolution during single pulse
measurement is made possible by using a 100MHz
reference oscillator. Resolution as fine as
1ps
is
obtained through time interval averaging. The
HM8122
displays
low frequency
measurements
with an
8-digit
resolution at a 1s gate time.
Besides its
nine
basic functions, the
HM8122
offers such practical features as preselectable
number of pulses per rotation, offset, display-hold,
single-shot
measurement,
external ports
for
gating, arming, gate-view and trigger-view. The rear
panel inputs also allow for measurements of channel
A gated by B. An integrated
calibration routine
and
extensive power-up self-test ensure proper and
accurate operation of the counter.
Since any counter is only as good as its input
circuits, great care was taken in considering the
technique of input signal conditioning.
The
three inputs
possess, depending on
frequency range, an input sensitivity of between
20mV
and
60mV
. A selectable low-pass filter,
switchable input coupling, two 20dB attenuators
per channel, and the switchable trigger slope enhance
trouble-free operation with nearly all input signals.
Automatic triggering
can be turned off for complex
signal measurements.
Any function of the Counter is programmable via
the optional
IEEE-488
or
RS-232
Interface.
Option HO85
The standard version of
the
HM8122
already in-
cludes a high-stability,
oven-controlled oscillator
with an accuracy of
±5x10
-7
.
The option
HO85
with a
stability of
±5x10
-9
is
available for higher stability
requirements. The oscil-
lator is easily field
installable and only an
external reference fre-
quency is required for
recalibration.
...
when
precision
c o u n t s
Subject to change without notice
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