Normal Operation - Omega HHLM112SD User Manual

If you choose "yES", after you press the REC/ENTER button the instrument
will prompt you to confirm that decision by displaying the term "Ent" below "yES"
and sounding three beeps. To confirm that you want to begin the erasure/formatting
procedure, press the REC/ENTER. "Ent" will then flash several times and the
instrument will sound another three beeps to confirm
that the SD card has been erased and formatted.
Once the SD card has been formatted (or not), the display will then either return to
the first of the six steps in the setup sequence—setting the current date and time—
or show the term "ESC". If "ESC" appears, press the POWER/ESC button to exit the
setup procedure and enter normal operating mode.

NORMAL OPERATION

The HHLM112SD can measure and store two different kinds of values:
• The intensity of light, in lux or footcandles. The unit lux is analogous to the
radiometric unit mW/cm2, but with the power at each wavelength weighted
according to the luminosity function, a standardized model of human visual
brightness perception. One footcandle = 10.764 lux.
• Temperature (in oF or oC), as sensed by a Type K or Type J thermocouple.
Pressing and holding the FUNC./HOLD/NEXT button will bring up, in order, two blank
five-digit displays above the terms "LIgHt" and "tP" (for temperature). Each display
also automatically shows the correct unit for the parameter.
1. To choose the measurement function, release the FUNC./HOLD/NEXT button
when the desired parameter appears. This becomes the instrument's default
measurement function until you change it.
2. To measure the intensity of light, plug the light probe (with its sensor cap on)
into the socket at the top of the HHLM112SD (callout 1-7) and use the
FUNC.HOLD/NEXT button to select light measurement mode. If the display shows
a value other than zero, press the LOGGER
three seconds until you hear a beep. Then remove the cap from the probe.
Holding the sensor housing, point the sensor directly at the light source whose
intensity you wish to measure. The display will indicate the intensity in units of lux.
To change the unit of measurement to footcandles (Ft-cd), press the REC/ENTER
button. The last unit selected becomes the default unit.
3. To measure temperature, first make sure that the light probe is not plugged into
the instrument. Then use the FUNC.HOLD/NEXT button to select temperature
measurement mode and plug either a Type K or Type J thermocouple into the
socket (callout 1-8) on the top of the HHLM112SD. The display will read out the
sensed temperature in degrees F or C, depending on the setting chosen during
setup.
8
button and hold it for at least