Alpha/Beta Scaler - Model 2929
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Introduction

The Model 2929 is a dual-channel scaler designed for use with a "phoswitch" and/or proportional type detectors that support discrimination between alphas and betas. A pulse height analyzer provides the separation and displays the counts for each on dedicated six-digit LED readouts. Each readout is accompanied by an audio volume rotary control. The high voltage is set via a fine 10-turn dial with the readout given on an analog meter.
 
The scaler count time is set by a combination of thumbwheel and multiplier controls that allow setting the time from 0.1 to 990 minutes. The front panel additionally provides a start-count button, halt-count button, and an on/off power switch. A red count lamp is illuminated anytime the instrument is performing a timed count.
 
Independent RS-232 serial outputs are supplied for the alpha and beta channels on the back panel for supplying data to either a printer or PC.