To increase the intensity of light sources with limited average power they are used in flash mode which allows much higher peak powers than in CW mode.
If the light flash is used for increased visual acuity, the flash peak power and the CW peak power do not show a linear correlation. Because of this evaluation of the effective intensity of pulsed light signals is done according to the Schmidt- Clausen method using with two different time constants C for daylight observation and night time observation.
The luminous intensity [cd] can be determined following the photometric law. E= I/r2.
To measure the luminous intensity, the VL-3702-2 detector will be used. The luminous intensity values will be determined by the measured Illuminance values and the distance. By defining special measurement distances, certain calibration factors can be stored into the Optometer.
Calibration of the Illuminance [lx] is performed at Gigahertz Optik`s Calibration Laboratory for Optical Radiation Quantities and is supported by a factory certificate.

System:

• Measurement range: 0,01lx – 2000000 klx
• C daylight = 0,1s for light adapted eye for I- Effective after Schmidt- Clausen
• C night time = 0,2s for dark adapted eye for I- Effective after Schmidt- Clausen

Detector:

• Luminous intensity (determined by measured Illuminance values and distance)
• High Sensitivity
• f1 ≤ 5% Cosine Field-of-View
• Calibration in lx
• 37mmØ; 20mm Height

Device:

• Photocurrent to voltage converter with 8 decade stepped gain ranges from 0,1pA- 2mA
• Gain depending slew rate from 3ms- 20ms
• A/D converter with 100μs sampling rate
• CW/ Dose/ Peak to Peak/ Relative ratio/ Pulse synchronization
• I- Effective after Schmidt- Clausen
• Pulse Offset
• Adjustable integrating time from 100μs- 6s
• Signal conversion from 0.166 Hz to >300MHz
• Internal Datalogger
• Analogue Output
• LCD- display with LED backlight
• Operating Temperature: 5 to 40°C (41 to 104°F) (75 % rel. H, non-condensing). Storage Temperature: 0 to 50°C (32 to 122°F).
• Dimensions/ weight: 195 x 100 x 40 mm / 500 g (7.7 x 3.9 x 1.6 in /1.1lb).
• Serial Port settings: RS232 (9600 baud, 8 data bits, 1 stop bit, no parity) 5 pin cylindrical TRIAD01 connector.
• Power supply: Battery or AC operation. Built-in rechargeable lead battery, 6V, 0.5 Ah. Approx 6 h with display illumination. Battery charge under 8 % is displayed. Operation from AC plug-in power supply 230V/50 Hz (other values on request) with specific U/I recharge characteristic

Accessories:

• Optionally RS232 Interface cable
• Optionally Windows based OS- P9710 Software
• Optionally BHO- Hard cases for safety transportation