Model 3030 & 3030E Series Technical Manual Section 4
Ludlum Measurements, Inc. Page 9 November 2017
ALPHA: A six-digit backlit LCD readout indicates counts received in the
alpha counting channel.
BETA: A six-digit, backlit LCD readout indicates counts received in the beta
counting channel.
QC: A red LED indicator illuminates whenever QC is needed. When a valid
QC check is performed, the QC indicator turns off. Additionally, the QC
indicator is turned off when the QC check feature is disabled (during setup).
OL: A red LED indicator illuminates whenever the internal circuitry detects a
current overload to the detector. This warning usually indicates an open
sample tray or a torn window on the front of the internal detector.
Instrument will not count while this indicator is illuminated.
CPM: A green LED indicator illuminates whenever CPM mode is
established (during setup).
DPM: A green LED indicator illuminates whenever DPM mode is
established (during setup).
αAL: A red LED indicator illuminates whenever the alpha count exceeds the
alarm level established during setup.
βAL: A red LED indicator illuminates whenever the beta count exceeds the
alarm level established during setup.
Back Panel
Detector Input Connection (Model 3030E only): a series "C" coaxial
connector; other connectors are available upon request
RS-232: a 9-pin D-connector for connection to printer or computer
CAL: a cover for the calibration potentiometers, which should only be
adjusted by trained and authorized personnel during calibration
INPUT: line or mains power receptacle and fuse holder. Use of two
one-amp, fast-blowing fuses provides protection to the instrument in case of
internal electrical failure.
Remove the calibration (cal) cover plate to access the following
calibration potentiometers:
A-TH: a multi-turn potentiometer used to vary the alpha pulse discriminator
from 40 to 700 mV, normally set at 120 mV
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