MARTINDALE MM84 Guia do Utilizador descarregar pdf (Página 56)

Sound Level Meter

Environmental

SP75

Applicable Standard:

IEC 651-1979 Type 2, ANSI S1.4-

1983 Type 2, JIS C 1502

Measurement Range: Lo - range

35-90 dB, Hi - range 75-130 dB

Measurement rate: once per sec,

nominal

Display: 3½ digit LCD

Resolution: 0.1dB

Frequency Weighting: A and C

Frequency Range: 31.5Hz- 8000Hz

Detector: True-RMS with

independent frequency weightings

Dynamic Range: 55dB

Maximum Hold decay time:

<1dB/3minute with Reset switch

Time Weighting: (S) SLOW and (F)

FAST according to IEC 651 Type 2

Microphone: ½" electret

(prepolarised) condenser

Supply: 4 x 1.5V batteries (AAA

size) UM-4 R03

Dimensions: 217 x 44 x 40mm

Weight: 168g approx (incl batteries)

Includes: windscreen, 4 batteries,

tripod mounting screw-nut &

protective carrying case

This compact sound level meter can be used one

handed or it can be mounted on a tripod for measuring

over long periods.

The Time Weighting can be set to Slow (for normal

use) or Fast to check the average level of frequency

noise.

Similarly the Frequency Weighting can be A or C with

C suitable for low frequency noise. An AC/DC output

allows capture of reading for later analysis (output is

approx 10mV DC/dB).

This unit is designed to give low cost assessment of

noise levels and not designed for professional safety

certification.

Light Meters LM90/LM92

LM90 Ranges:

20lux, 200lux, 2000lux, 20klux

20fc, 200fc, 2000fc, 20kfc

LM92 Ranges:

200lux, 2000lux, 20klux, 200klux

200fc, 2000fc, 20kfc, 200kfc

Resolution: 0.1lux, 0.1fc

Spectral response: CIE photopic

Total accuracy for CIE standard

illuminant A (2856K):

± (3%rdg + 10dgts)

Supply: 9V battery (NEDA 1604,

IEC 6F22 006P)

Dimensions: 190 x 65.5 x 35mm

Weight: 210g approx (incl battery)

Includes: battery and manual

The LM90 is preferred for

emergency lighting applications;

the LM92 is more sensitive at

higher lux levels.

Photometric Formulas:

10.764 foot candles=lux

(lumens/meter

)

0.0929 lux= foot candles

(lumens/ft

)

These low cost light meters resolve down to .01 lux,

making them appropriate for use in very low light

applications such as certifying emergency lighting.

The handbook gives details of conversion factors for

different light wavelengths allowing more accurate

measurements.

Peak Hold & Hold allow a maximum reading to be

recorded or one particular result to be kept. Results

can be shown in lux or foot candles.

MARSP75 sound level meter £89.00

TC2C calibration £55.00

MARLM90 light meter (0.01-20k lux) £99.00

MARLM92 light meter (0.1-200k lux) £89.00

TC2C calibration £55.00

LM92 illustrated

Two versions are available:

LM90: 20 lux to 20k lux

LM92: 200 lux to 200k lux

(more sensitive in higher

ranges)

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