Selecting A Measurement Range; Zero Procedure; Analog Output - Extech Instruments 401025 User Manual

Selecting a Measurement Range

Zero procedure

Analog Output

Lighting Type Correction Factors
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The meter has three measurement ranges for each unit of measure (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.
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.
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.
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.
Mercury Lamp
Fluorescent Lamp
Daylight
Sodium
Metal Halide
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X0.92 to 1.12
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x1.22
x1.00
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