HT instruments HT307 - Manual (Page 5)

HT307
EN - 4
2.2. INSTRUMENT DESCRIPTION
HT307
Lux/fc light meter
7
LEGEND:
1. LCD display with a maximum reading of 2000
points. Signs of measured values, unit
function symbols and decimal points are
displayed.
2. Power key: press it to turn ON or OFF the
meter.
3. M/H key: press it to select the maximum,
minimum or current reading. Press for more
than 1 second to resume normal
measurement.
4. Lx/Fc key: press it to express values in fc scale
instead of lux (1 fc=10.76 lux).
5. D-H key: press it to hold displayed data. Press
again to resume normal measurement.
6. R selection key: press it to select 20 lux, 200
lux, 2000 lux, 20 Klux, 200 klux, / 20 fc, 200 fc,
2000 fc, 20 Kfc. Overall, 5 ranges for lux and 4
ranges for fc. Upon pressure, a mobile cursor
selects the desired full scale.
7. Output for analogic DC. Refer to Table 1
below to get the equivalence Lux/fc and mV
values.
8. ADJ Trimmer for manual zeroing regulation.
9. Photo detector.
Fig. 1: Instrument description.
Range DC output
Plug for DC analogic output
20 Lux/fc 1 Lux/fc = 10 mV
200 Lux/fc 1 Lux/fc = 1 mV
2000 Lux/fc 1 Lux/fc = 0.1 mV
20 kLux/fc 1 Lux/fc = 0.01 mV
200 kLux 1 Lux = 0.001 mV
Table 1: signal equivalence values between Lux/fc and mV.