Model 4612 Twelve-Channel Counter
Technical Manual
Section 2
Ludlum Measurements, Inc.
Page 10
November 2019
Rate Meter
The rate meter settings configure the rate meter display on the main
screen. The rate meter can be set to display in cps, cpm, R/hr, and
Sv/hr. The calibration constant must be correctly set to display the rate
meter reading correctly. For instance, set the cal constant to 60 for cps
and set the cal contant to 1 for cpm. Calibration constants for R/hr and
Sv/hr will depend on the type of detector connected. The time constant
affects the response time of the rate meter reading. A lower time
constant give a faster response time while a higher time constant gives a
slower response time.
Each channel has an individual rate meter alarm that can be set. When
the current rate meter reading exceeds the set point, the background for
the channel turns red and an audible alert will sound (if enabled). The
default alarm set point is 1000 cps. During a timed count, the rate meter
will display the highest reading. At the end of the count the highest
reading will be logged to the .CSV file.
Summary of Contents for 4612
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