LUDLUM 26-1 User Manual

Model 26-1 Frisker User’s Manual Section 5
Ludlum Measurements, Inc. Page 5-3 April 2017
Entering Setup Mode
To enter setup mode, power down the Model 26-1, then turn the unit back ON.
Following the display of the Firmware version, when the instrument has begun
normal operation, press the MODE button three times (within four seconds) to
enter Setup mode. Entry to Setup mode can be confirmed when the numeric
portion of the display shows the Calibration Constant parameter, and no units
(cps, cpm, Bq, dpm, mR/h, or µSv/h) are displayed. If you simply wish to view
the parameters, you may do so by not pressing any other buttons. The
parameters will change every four seconds when no buttons are pressed, or the
UNITS button can be pressed to advance to the next parameter. The unit will
return automatically to normal operation after the last parameter is presented.
SETUP PROTECT: The Model 26-1 parameters can be protected from
unauthorized changes via the internal switch located on the Model 26-1 circuit
board. To change the switch, open the battery compartment and remove the
batteries from the Model 26-1. Next, loosen the four captive Phillips head
screws that fasten the detector cover.
Now turn the Model 26-1 over so that the detector is facing up. Gently remove
the plastic case that covers the back of the instrument, paying careful attention
not to lose the protective screen that covers the detector itself. Remove the
protective screen, and gently lift the GM pancake detector and set it to the side.
The DIP (dual in-line position) switch should now be visible below the detector
retainer.
To protect the Model 26-1 from changes in Setup mode, slide DIP Switch 2
(closest to the battery compartment) to the ON (right) position. If DIP Switch 2
is in the OFF (left) position, changes are allowed in Setup mode. Once the DIP
Switch is set as desired, gently replace the detector in the detector retainer. Place
the detector screen over the detector, and fit the plastic case on the back of the
instrument. Turn the instrument over and tighten the four Phillips head screws.
Install the batteries, and replace the battery cover. Note that with the DIP
Switch 2 in the ON position, Setup mode may be entered and parameters
viewed, but changes cannot be made.
DISPLAY BACKLIGHT ‘Continuous On’: The Model 26-1 display
backlight can be set to remain on continuously during operation. Follow the
steps above for SETUP PROTECT, but use DIP Switch 1 for display
backlight selection. Setting DIP Switch 1 to the ON (right) position will
configure the display backlight to remain on during operation. Set DIP Switch 1
to the OFF (left) position, and the display will be backlit only when light levels
are low.
NOTE: Setting the display backlight for continuous-on operation can result in
reduced battery life.

LUDLUM 26-1 Specifications

General

Brand	LUDLUM
Model	26-1
Category	Measuring Instruments
Language	English