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SCALER

Manufacturer: Picker Nuclear (USA)
Model: Compact Scaler (Transistorized) 644-010
Cost: $450

Description

An electronic device for counting short duration electrical impulses. The time interval of the counting is also measured precisely. A stable, adjustable high voltage power supply is also included to supply the needs of Geiger-Muller tubes or scintillation detectors which may be connected to the scaler.

Specifications

Scaler	Max. count 99,999 (1 count resolution)
resolving time	50 u-sec (between pulses)
amplitude	> 25 mv or 250 mv depending on switch position.
Timer	Max. time 999.99 min resolution 0.01 min
Power Supply	500-1600 V positive 500 uA max. current

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Operating Instructions

Connect the sensing device to the appropriate terminal on the rear panel (Detector Input for G-MT and Scint. Detector), and set the sensitivity switch which is located beside it (usually 250 mV for G-MT and 25 mV for a Scint. Det.).
Make sure the power and HV switches are off, and connect the unit to the 115 V 60 Hz mains.
Turn on the power.
Set the HV to the desired level and turn it on when required.
Reset both the scaler and the timer by rotating the reset in the direction of the arrow. Reset the scaler alone by rotating the reset in the opposite direction.
Use the count switch to initiate and terminate counting. Both scaler and timer hold their counts when the switch is turned off.

Precautions

Do not leave the counter on when not wanted for more than a 15 minute period as the glow tube life is limited.
Be careful with the input leads. They carry dangerous voltages. Accidental shorting of the Detector Input with the HV on will probably destroy the input transistor amplifier.

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keywords: radiation counter, alpha ray measurement device, beta ray measurement device, gamma ray measurement device, nuclear measurement device.

Document created circa 1980. Original author: Unknown.