Specifications

MODEL 370 REV: D Page 20 of 26
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
insure that the front end amplifier does not saturate.
8. For luminance measurements or sources smaller than 15º use the
1120 reflex viewing module.
6.4.4 Typical Measurement Units
(SI unit)
nit (candela/m
2
) [cd/m
2
]
stilb (candela/ m
2
) [cd/m
2
]
apostilb (1/π candela/ m
2
) [1/π cd/m
2
]
lambert (1/π candela/cm
2
) [1/π cd/m
2
]
candela/ft
2
[π footlamber]
footlambert (3.426 candela/m
2
) [1/π cd/ft
2
]
6.4.5 Procedure for Radiance
Perform the same procedure as outlined in Section 6.4.2 but with the
radiometric filter in place of the photometric filter. Typical units will be
watts/cm
2
-sr.
6.4.6 Procedure for Luminous or Radiant Intensity
Perform the same procedure as outlined in Sections 6.4.2 and 6.4.3 above
using the photometric filter for luminous intensity, the radiometric filter for
radiant intensity and substituting a point source which subtends less than a
15º angle at the detector in place of the extended source.
Typical units will be:
- Candela (lumen/sr)
- Watt/sr
6.5 Miscellaneous Measurements
Utilizing the procedures outlined above, numerous other measurements may be
performed. A few representative examples are listed below.
6.5.1 LED Measurements
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