Analog Output; Replacing The Battery - Extech Instruments 401025 User Manual

Selecting a Measurement Range
The meter has three measurement ranges (0-200, 0-2000, and 0-5000 Fc) and (0-2000, 0-20000, and
0-50000) Lux). The proper range selection will produce the most accurate reading. Always select the
range that produces the maximum number of digits without exceeding the maximum count for that
particular range. For example, a reading of 1456 Fc should be read on the 0 - 2000 range, not the 0-
5000 range.
Zero procedure
The meter zero (display with no light input) may change with time. Occasional checking and
adjustment may be required.
1. Completely cover the sensor to block out any light.
2. Set the range switch to the lowest Lux or Fc range
3. Using a small screwdriver, adjust the "Zero" control for a zero display. The last digit may
change slightly. This is normal and does not affect the accuracy of the meter.

Analog Output

The analog output jacks on the front panel produce a 0.1mV DC per digit signal that can be used for
recording or datalogging purposes.
Lighting Type Correction Factors
The 401025 light meter is calibrated under a precise "Standard tungsten light source of 2856
meter is to be used under a different type of light the correction factor of from the table below should
be applied to the readings obtained.

Replacing the Battery

When the left corner of the LCD display shows "LO BAT", it indicates the battery output is below the
design limit and the battery needs to be replaced. However, reliable measurement can still be taken for
another few hours before the tester becomes inaccurate.
1. Open the Battery Cover at the back of tester and remove the battery.
2. Replace with a 9V battery and install the cover.
You, as the end user, are legally bound (EU Battery ordinance) to return all used
batteries, disposal in the household garbage is prohibited! You can hand over your
used batteries / accumulators at collection points in your community or wherever batteries
/ accumulators are sold!
Disposal: Follow the valid legal stipulations in respect of the disposal of the device at the
end of its lifecycle
Mercury Lamp
Fluorescent Lamp
Daylight
Sodium
Metal Halide
x1.14
X0.92 to 1.12
x1.00
x1.22
x1.00
3
O
K". If the
401025-EU-EN-V2.2-2/12