Hameg Instruments HM8122 Manuel page 19

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.
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
Subject to change without notice
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.
The
Option HO85
The standard version of the
HM8122 already includes
a high-stability, oven-
controlled oscillator with
an accuracy of ±5x10
option HO85 with a sta-
-9
bility of ±5x10
for higher stability require-
ments. The oscillator is
easily field installable and
only an external reference
frequency is required for
recalibration.
... when
precision
-7 . The
is available
c o u n t s
HM8122 19