Models SRJ-7 and HRJ-7 Juno Survey Meters

Bulletin No. 166
DECADE SCALER
Model DS-SB and Model DS-5BA
Five decade units for direct read-out.
Push-button electric reset.
Highly stable +300 to f3000 volt D.C.
detector supply.
Choice of 10 predetermined counts.
Built-in elapsed time indicator.
Choice of 1 or 5 microsecond resolving time.
APPLlCATlO N. Technical Associates Models DS-5B
and DS-5BA Decade Scalers are precision counting
instruments for use with Geiger, Scintillation, or
Proportional Detectors, and have been carefully designed
to combine exceptional versatility with extreme
reliability and simplicity of operation. Model
DS-5B provides 5 microsecond resolving time; Model
US-5BA provides 1 microsecond resolving time for
higher counting rates. In addition to operation as a
conventional scaler, they may be used with a printing
medical scanner or with printing timers or similar
external accessories.
DECADE UNITS. Five Model DU-5 decades provide
a count capability of 99,999. By use of the Model
CR-2 External Register, this may be extended to
1 x 108 counts. A special Model DU-1 one-microsecond
decade is used as the first decade in Model DS-5BA.
HIGH VOLTAGE DETECTOR SUPPLY. Built-in
high voltage detector supply provides 300 to 3000
volts of exceptionally stable direct current. Desired
voltages are obtained by a dual voltage range selector
switch in conjunction with coarse and fine controls.
PREDETERMINED COUNT. A single control provides
choice of ten predetermined counts (4-10-40-100-
400-1K-4K-10K-40K-10OK) or manual operation for
counting against time.
ELAPSED TIME INDICATOR. The time elapsed
during any counting operation is registered on a five
digit (odometer type) indicator which will indicate
up to 999.99 minutes of elapsed time. Elapsed time
may be accurately read to hundredths of a minute.
PRESET TIME. A connector is provided at rear of
instrument to accept T/A Models PT-1, PT-2, or
PT-3 Predetermined Timers, for applications where
the total number of counts for a specific period of
time is desired.
PUSH-BUTTON RESET. Resetting the entire instrument
is accomplished by the operation of a single
push-button, which electrically resets the 6 decades
and the elapsed time indicator, as well as external accessories.
A two-position stop-count lever type switch
is provided for manual control of the instrument.
INSTRUMENT TEST. A 60 cycle test switch permits
checking the instrument's operation with the
3600 cpm line frequency.
AUTO-NORMAL CONTROL. When the Auto-
Normal switch is in the normal position, the Model
DS-5B or DS-5BA operates as a standard scaler and
offers predetermined count and manual operation.
When the switch is in auto position, the instrument
may be used with printing medical scanners in making
body scans, or with print-out timers in half-life
decay studies. In auto position, the scaler will count
to any of the 10 predetermined counts to which the
predetermined count control has been set, then automatically
reset the entire instrument to zero, and
resume counting and recycling. Each time the predetermined
count is reached, a positive pulse is provided
for operating external accessories.
TA
TECHNICAL ASSOCIATES
140 WEST PROWDENCIA AVENUE BURBANK, CALIFORNIA
5M-2/59
Printed in U.S.A.