Model 14C Survey Meter
Ludlum Measurements, Inc. Page 8 July 2022
4. Identification of Controls and Functions
Range Multiplier Selector Switch: a six-position switch marked “OFF”, ×1000, ×100, ×10, ×1, and
×0.1. Moving the range selector switch to one of the range multiplier positions (×1000, ×100, ×10,
×1, and × 0.1) provides the operator with five decades of range multipliers. Multiply the scale
reading by the multiplier to determine the actual scale reading.
AUDIO ON/OFF Toggle Switch: In the on position, the switch energizes the unimorph speaker,
located on the left side of the instrument. The frequency of the clicks is relative to the rate of the
incoming pulses. The higher the rate, the higher the audio frequency. The audio should be turned
off when not required to reduce battery drain.
Note:
A low-battery condition results in a steady audio tone regardless of the position of the AUD
ON-OFF switch.
Fast Slow Toggle Switch: provides meter response. Selecting the fast, F, position of the toggle
switch provides 90% of final meter reading within four seconds. In the slow, S, position, 90% of the
final meter reading takes approximately 22 seconds. Set this switch to the F position for fast
response and large meter deviation. The "S" position should be used for slow response and damped
meter deviation.
Note:
The slow response position is normally used when the instrument is displaying low numbers,
which require a more stable meter movement. The fast response position is used at high rate
levels.
RESET Button: When depressed, this button provides a rapid means to drive the meter to 0.
BAT Check Button: When depressed, this button provides a visual means of checking the battery
charge status. The instrument must be turned on to perform this check.
Range Calibration Adjustments: Recessed potentiometers are located under the calibration cover
on the right side of the front panel for use in range calibration adjustments. These controls allow
individual calibration for each range multiplier.
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