Specifications

MODEL 370 REV: D Page 17 of 26
sensitivity is required and when the source is within the detector
acceptance angle.
6. Follow the zeroing procedure outlined in the operating section of the
manual.
7. Adjust the range switch until a non-full scale reading is obtained. When
measuring time varying sources it is advisable to view the analog
output (on instruments so equipped) with an oscilloscope to ensure that
the fron end amplifier does not saturate.
8. See Section 7.0 for formulas relating exposure in lux-seconds to film
speed.
6.2.4 Typical Measurement Units
- Footcandles (lumen/ft
2
)
- lux (lumen/m
2
)
6.3 CW Laser Power Measurements
6.3.1 Purpose
To determine the total power in a CW laser beam, irradiance from a CW
laser, or irradiance from any other CW light source.
6.3.2 Equipment
A - Radiometer/Photometer Indicator Unit
B - detector and cable
C - radiometric filter
6.3.3 Procedure
1. The procedure outlined below and the equipment listed above is
specifically applicable to sources with the following characteristics:
- 450 – 950 nm
- less than 10 mw total power
- less thn 500 mw/cm irradiance
Special cases falling outside this range are discussed separately.
2. Connect the instrument to the detector using the cable supplied.
3. Attach the radiometric filter onto the detector housing with the filter
between the detector and the limiting aperture.
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