Model 26-1 Frisker User’s Manual Section 1
Ludlum Measurements, Inc. Page 1-2 April 2017
The instrument features a large backlit LCD (liquid crystal display), a
piercing audio warning, and easy, intuitive use in a single-handed
platform. A comfortable wrist strap and lanyard are also included for
keeping the instrument close and secure. The unit body is made of
lightweight but durable plastic. It is intended for outdoor use and can
resist splashing water.
There is also a headphone option available (not included). The
instrument can be modified to include a standard 1/8 inch headphone
jack (part number 4498-538).
The display will be automatically backlit if light levels are low. The
display backlight can also be configured for “Continuous On”
operation. RATE and MAX modes can be silent or utilize a “click”
audio; the “click” audio is always silent during COUNT mode.
Setup of the instrument is accomplished through the front-panel
buttons. The advanced user or administrator can set:
Calibration Constant
Dead Time Correction
Efficiency
Primary and Secondary Units
Primary and Secondary Unit Alarm Levels
Primary and Secondary Count Units
Primary and Secondary Count Alarm Levels
Response Time
Auto-Response Rate (Fast or Slow)
Available Operational Modes
Count Time
Setup can be disabled via the internal switch on the Model 26-1 in order
to protect settings.
The unit is operated with two alkaline AA batteries for operation from
-40 to 65 °C (-40 to 150 °F). Battery life is approximately 1000 hours
under normal usage. A low-battery indicator on the LCD warns when
less than 16 hours of battery life remain.
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