| |
Model LM-120
Digital Light Meter |
|
Overview
The Amprobe LM-120 light meter measures the visible light from
fluorescent, metal halide, high-pressure sodium or incandescent
sources. It is a portable, easy-to-use digital light meter designed
for simple one-hand operation reading in Lumen (lux) or footcandle
(fc) units. The LM-120 measures a wide range of light up to 20,000
fc or 200,000 lux with an accurate, high resolution of 0.01 fc/lux.
This unit is Autoranging plus manual ranging with ability to Zero
out the reading before taking a measurement.
Use the LM-120 light meter to measure the
illumination level in the interior and to switch off or reduce or
increase the output level of lighting fixtures. Reduce the energy
burden of the building by significantly increasing the efficiency of
its lighting system.
One lux is the illumination from a one candela
lamp perpendicular to a surface one meter squared at a distance of
one meter. One fc is the illumination from a one candela lamp
perpendicular to a surface one foot squared at a distance of one
foot. 1 footcandle = 10.764 lux and 1 lux = 0.09290 footcandles.
|
 |
Features
- Measure in Lux or Footcandles, front panel switchable.
- Measuring Range to 200,000 Lux or 20,000 Footcandles.
- Silicone photodiode sensor and filter.
- Data Hold to freeze reading on the digital display.
- Min/Max ability to show high and low readings.
- Autoranging plus Manual Range.
- Zero function to null display before reading.
- Auto Power Off to save battery life.
- Includes protective sensor cap.
- Large, 3-1/2 digit display.
- Supplied with: User's Manual, Protective Sensor Cap,
and 9 volt battery installed.
 |
|
| Specifications |
|
Measuring Range |
20, 200, 2000,
20,000, 200000 Lux |
|
|
20, 200, 2000,
20,000, Footcandles |
|
|
|
|
Accuracy |
±3% (calibrated to standard incandescent lamp at 2854°K) |
|
|
6%
other visible light sources |
|
|
|
|
Angle Deviation from
Cosine |
|
|
|
|
|
|
|
|
Cosine Angular
corrected per JIS C 1609-1993 and CNS 5119 general 'A'
class |
|
|
|
|
Resolution |
0.01 fc/lux |
|
Measurement Rate |
2.5 times/second |
|
Illumination |
Accuracy at 23°C
± 5°C (73.4°F ± 5°F), < 75% R.H. |
|
Sensor |
Silicone photodiode and filter |
|
Operating
Temperature |
-10°C
to 60°C (14°F to 140°F), 0% to 80% R.H. |
|
Storage
Temperature |
-10°C
to 60°C (14°F to 140°F), 0% to 70% R.H. |
|
Display |
3-3/4 digit LCD, with
a maximum reading of 1999 |
|
Polarity |
Automatic, positive
implied, negative polarity indication |
|
Overrange |
(OL) or (-OL) is displayed |
|
Zero |
Automatic |
|
Altitude |
2000 meters, indoor operation |
|
Safety CEEMC |
EN 61326-1 |
|
This product complies with requirements of the
following European Community Directives: 89/336/EEC (Electromagnetic
Compatibility) and 73/23/EEC (Low Voltage) as
amended by 93/68/EEC (CE Marking). However, electrical noise or
intense electromagnetic fields in the vicinity of the equipment may
disturb the measurement circuit. Measuring instruments will also
respond to unwanted signals that may be present within the
measurement circuit. Users should exercise care and take appropriate
precautions to avoid misleading results when making measurements in
the presence of electronic interference.
|
|
|
|
|
|
|
|
General Specifications |
|
Power Source |
One 9V battery, NEDA
1604 or JIS 006P or IEC 6F22 |
|
Battery Life |
200 hours typical
(Alkaline) |
|
Sensor
Dimensions |
80mm (L) x 55mm (W)
x 29mm (H) |
|
Light Meter
Dimensions |
130mm (L) x 63mm (W)
x 38mm (H) |
|
Light Meter Weight |
220g |
| |
|
|
Included Accessories |
|
User's
Manual, Protective Sensor Cap, and 9 volt battery installed. |
|
| |
|
|
