HD2102 - 10 - V2.3
Type of measurement
Unit of
Measurement
Integral Q Unit
of Measurement
Illuminance (PHOT) lux - fcd
lux⋅s - fcd⋅s
Irradiance (RAD - UVA - UVB - UVC - PYRA)
W/m
2
- μW/cm
2
J/m
2
- μJ/cm
2
PAR
μmol/(m
2
⋅s) μmol/m
2
Luminance (LUM 2) cd/m
2
----
Note: for the LP471 LUM 2 luminance probe, the integral calculation is not provided.
This setting changes the information displayed and the immediate print of data (SERIAL key). The
data recorded using the LOG function (HD2102.2) and sent to the printer or PC through the
serial port using the SERIAL function (HD2102.1 and HD2102.2), keep the chosen and
displayed unit of measurement.
While setting the limits for Q(t) calculation, the UNIT key selects the coefficient 3, 6 and 9 that
multiplies the displayed value respectively by 10
3
, 10
6
, 10
9
.
+
Integral Q(t) calculation
Pressing the FUNC and UNIT keys simultaneously, the integral Q(t) function is started. By pressing
the same keys again allows the current function to be exited and to return to standard measurement.
Please see the paragraph dedicated to calculation on page 17.
Start/Stop Q/T - ESC key
Starts and ends the Integral Q(t) calculation. The instrument must have previously been set for the
calculation by pressing at the same time the FUNC/ENTER and UNIT-Q/T keys.
When used in the menu, it clears or cancels the active function.
REL/ key
In measurement mode, it displays the difference between the current value and that measured on
pressing the key. The REL message appears on the display; press the key again to return to the
current measurement.
When used in the menu, it decreases the current variable value.
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