Models SRJ-7 and HRJ-7 Juno Survey Meters

Bu//etin No. 764
INSTRUMENTATION FOR NUCLEAR RESEARCH
MODEL GS=7 BINARY SCALER
0 with automatic
electric reset
0 predetermined count
0 elasped time
indicator
binary scale of 256
300-3000 volt
detector supply
APPLICATION
and SCOPE OF USE.. .
The Model GS-7 Binary Scaler is a general purpose,
precision counting instrument which features extreme
simplicity in operation, as well as unusual flexibility
in counting procedui,es. It is designed for use with
Geiger, scintillation, or proportional detectors, and
has many applications in diagnostic and therapeutic
procedures in nuclear medicine, radiochemical studies,
and other laboratory counting problems. Exceptional
reliability is assured through the use of newly developed
components of the highest quality. The GS-7 has
a resolving time of 5 microseconds. For counting problems
requiring shorter resolving time, the GS-7A,
with 1 microsecond resolution, is available.
OPERATION: The GS-7 uses 8 binary scaling
stages, providing an electronic scaling factor up to
256. A scale selector switch allows a wide choice of
scaling speeds. The total recorded count is determined
by multiplying the reading on the five-digit register
by the scaling factor, and adding the values of the
GS-7 Binary Scaler slcown in use
with scanner for thyroid “mapping!’
interpolation lights which are illuminated. Built-in
features include an elapsed time indicatol., which
gives the exact amount of time elapsed duiing any
counting run. The GS-7 is available with eithei, a
timer i,eading in seconds, or in hundredths of a minute.
Either timei, indicates a total elapsed time of
60 minutes.
An outstanding featu1.e of the GS-7 is the automatic
electric reset button, which simultaneously resets the
i.egistei., timer, and binary scale indicators in one
single operation. Laboratory technicians will quickly
recognize the ti.emendous value of this feature in
simplifying operation and assuring faster, more efficient
counting procedures.
The GS-7 incorporates an accurately regulated 300-
3000 volts D.C. detector supply, with extremely accurate
settings accomplished by “coarse” and “fine” adjustments.
A panel switch turns the high voltage on
and off, without changing the voltage setting.
Predetei,mined count selection is provided by a switch
which enables the usel’ to automatically stop the scaling
action aftel, I, 10, or 100 registel. counts. When
the preset count is reached, the scaler stops, and the
time requii.ed to accumulate the count is i.ead on the
timer. The GS-7 may also be coupled with such external
accessories as the Predetei,mined Timers PT-1,
PT-2, or PT-3, to gain the added advantage of preselected
counting time.
T E C H N I CAL ASS 0 C I AT E S
140 WEST PROVIDENCIA AVENUE BURBANK, CALIFORNIA
4M-9/58
Printed in U.S.A.