Model 14C Survey Meter
Ludlum Measurements, Inc. Page 12 July 2022
Warning!
Open instrument has shock potential! Do not allow any conductive material to come in
contact with internal parts while making the following adjustments.
SETTING OVERLOAD
Disconnect the external detector.
Set the instrument range selector multiplier switch to ×100.
On the HV power supply board, adjust R3 until the unit indicates a full-scale reading (on the ×100
scale) at 10 R/hr, and no over-range at 4 R/hr.
RANGE CALIBRATION
Turn the instrument range multiplier selector switch to the appropriate range. Expose the detector
to a calibrated gamma field and adjust the respective range calibration potentiometer for proper
reading.
Repeat the above procedure for the remaining ranges.
MAINTENANCE
Instrument maintenance consists of keeping the instrument clean and periodically checking the
batteries and the calibration. The Model 14C instrument may be cleaned with a damp cloth (using
only water as the wetting agent). Do not immerse instrument in any liquid. Observe the following
precautions when cleaning:
1. Turn the instrument OFF and remove the batteries.
2. Allow the instrument to sit for one minute before accessing internal components.
RECALIBRATION
Recalibration should be accomplished after maintenance or adjustments have been performed on
the instrument. Recalibration is not normally required following instrument cleaning, battery
replacement, or detector cable replacement.
Note:
Ludlum Measurements, Inc. recommends recalibration at intervals no greater than one year.
Check the appropriate regulations to determine required recalibration intervals.
Ludlum Measurements offers a ful-service repair and calibration department. We not only repair and
calibrate our own instruments, but most other manufacturers’ instruments as well. Calibration
procedures are available upon request for customers who choose to calibrate their own instruments.
BATTERIES
The batteries should be removed any time the instrument is placed into storage. Battery leakage may
cause corrosion on the battery contacts, which must be scraped off and/or washed using a paste
solution made from baking soda and water. Use a spanner wrench to unscrew the battery contact
insulators, exposing the internal contacts and battery springs. Removal of the handle will facilitate
access to these contacts.
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