Guymark, Guymark UK, Medical audio equipment, sound level meters, sound level indicators, Cradley Heath, West Midlands, Midlands, Wales, South West England, South East England, Scotland, Republic of Ireland

St Luke’s House, Upper High Street, Cradley Heath, West Midlands, B64 5HX

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200 SERIES

This is an inexpensive range of instruments for noise checks in the workplace or general noise measurements. With simple to understand functions and large LCD screens they are ideal instruments particularly for personnel new to noise measurement or where regular spot checks on workplace noise may be required.

The range of functions and features for each model are given in the tables below.

Specification
Model Number CEL-	254	231
Leq measurement capability
Time weightings Maximum Hold
30-135dB(A) measurement range for instantaneous sound level
70dB dynamic span - 2 ranges 30-100dB and 65-135dB
Frequency weightings "A"
Frequency weightings "C"
Time weightings Slow and Fast
Time weightings Impulse
Pre-weighting overload detector
Standards compliance ANSI S1.4 Type 2A
Standards compliance IEC 651 Type 2 Impulse
Standards compliance IEC 804 Integrating Average SLM
Displays: 3 1/2digit, 12.7mm high character LCD
Customised LCD showing measurement mode
Auxiliary outputs: AC Conditioned 7.25V RMS FSD. Minimum load impendance 39k
Auxiliary outputs: DC log RMS output nominally 25mV/DB. Minimum load Impendance 27k

Common Features
Accuracy:	+ - 1dB under reference conditions
Electret condenser microphone	1/4" electret capsule with fixed preamplifier
Reference conditions:	114dB SPL, free field perpendicular incidence, 1kHz, 20C, 65%RH
Temperature range:	-10C to +50C operating, -20C to +60C storage
Humidity effect:	<0.5dB 30% to 90%RH
Batteries:	4 x AAA Manganese Alkaline Cells
Battery Life:	20 hours typical - low battery indicator
Dimensions:	258mm x 70mm x 21mm
Weight:	230 grams (with batteries)

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