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PROBES
The primary purpose of the probes is to detect and measure light in its
various aspects; for this reason there are different probes available to suit
the different requirements. Probes are required for measuring illuminance
(lux, foot-candle), irradiance (W/m
2
) and luminance (cd/m
2
). Each sensor
has its own work band completed by filters or diffusors which correct or
limit its range. The size of the silicon sensor used in the various probes is
7.34 mm
2
. The probes are housed in a container of black anodized alumi-
nium anticorodal UNI 9006/4; the correction filters are made of special
glass, while the diffusors are in quartz or plastic material specially desi-
gned for the purpose. The probe is complete with 2 metres of flexible cable
and a DIN 45236 8-pole connector inside which is an electronic circuit that
amplifies and codes the signal supplied by the sensor.
The probes are calibrated individually and are therefore interchan-
geable.
HD 9021 PHOT/C
Photometric probe for measuring light, ILLUMINANCE, photopic correction
filter complying with CIE, diffuser for cosine correction. Range
0÷200,000 lux (0÷200,000 foot candle). This is the probe for measuring
light with correction according to the human eye; it is suitable for measure-
ments in offices, schools, laboratories, places of entertainment, emergency
exits, car parks, galleries, shops, shop windows, factories, etc., in all ligh-
ting measurements.
The typical response curve of the probe is
as follows:
ENGLISH
– 42 –
740.0
700.0
660.0
620.0
580.0
540.0
500.0
460.0
420.0
380.0
0.00
0.11
0.22
0.33
0.44
0.56
0.67
0.78
0.89
1.00
780.0