Description Of Function Keys; Hold/L.s. (Light Source) Key; Lx/Fc/Cd Key - HT HT309 Manuel D'utilisation

4.2. DESCRIPTION OF FUNCTION KEYS

Some of the function keys on the front panel have a double function, which can be
activated by pressing and holding the key for more than 1 second.

4.2.1. HOLD/L.S. (Light Source) key

Press the HOLD/L.S key to freeze the value of the measured quantity on the display.
The symbol "HOLD" appears on the display. Press the HOLD/L.S. key again to exit the
function.
Press and hold the HOLD/L.S. key for more than 1 second to select the light source to
be measured. Proceed as follows:
1. On the sub-display, observe the flashing symbol "Lx", where 0 < x < 9 indicates the
source number.
2. Use the arrow keys
L0 ÷ L9 (see Table 1)
3. Press the HOLD/L.S. key to set a possible correction factor on the instrument's reading
(only for custom sources L7, L8 and L9). The indication of the parameter value flashes
on the display. Use the arrow keys
operation) the value between 0.001 and 1.999. The values of the sources L0 ÷ L5
cannot be modified.
Symbol on the
display
L0
L1
L2
L3
L4
L5
L6
L7
L8
L9
4. Press and hold the HOLD/L.S. key for more than 1 second to confirm the operation.
The symbols stop flashing on the display.

4.2.2. LX/FC/CD key

Press the LX/FC/CD key to select the measuring unit of illuminance, choosing between
the two available options "LUX" and "FC" (1Fc = 10.764Lux ; 1Lux = 0.09290Fc).
Press and hold the LX/FC/CD key for more than 1 second to select the measuring unit
of luminous intensity (see § 4.3.2).
or to select the desired source among the available options
or
Source type
Standard light
White LED
Red LED
Yellow LED
Green LED
Blue LED
Purple LED
Custom
Custom
Custom
Table 1: List of available sources
EN - 5
to set (press and hold the keys for rapid
Correction factor
HT309
1.000
0.990
0.516
0.815
1.216
1.475
1.148
1.000
1.000
1.000