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Illuminance and luminance measurement 

The VL-3701 is a detector for precise illuminance measurements in Lux. Its application potential can be enhanced using an SRT-M37-L series front lens adapters so as to measure the luminance in cd/m². Since measurement field focusing is hereby not possible, this combination is mostly applicable for extensive illumination fields e.g. light boxes. 

Easy set-up 

In order to fix the SRT-M37L lens adapter onto the VL-3701 measurement head, the SRT-M45/37 adapter is required. This is attached onto the measurement head using side screws. For secure fitting, the lock screws fix into the V-nut on the measurement head. The lens adapter can then be simply screwed in. The SRT-M45/37B adapter has an M6 and a (1/4”-20 BSW) tripod screw on the side for mounting to tripods and others. 

1° to 5° Field-of-View angle 

Lens adapters with 1°, 2°, and 5° FOV angles are hereby offered. 

Traceable calibrations 

Luminance responsivity calibration can be performed by Gigahertz-Optik‘s calibration laboratory for optical measurands. Calibration is validated by a calibration certificate.

Front lens adapter vor VL-37 detector heads
Product
Max. signal current

1 mA

Specification
Lens diameter

22.4 mm

typical responsivity

VL-3701 with SRT-M37L-1

Field-of-Viev

Typical luminance responsivity

1.2 pA/(cd/m²)

VL-3701 with SRT-M37L-2

Field-of-View

Typical luminance responsivity

5 pA/(cd/m²)

VL-3701 with SRT-M37L-5

Field-of-View

Typical luminance responsivity

30 pA/(cd/m²)

Miscellaneous
Cable Length

2 m

temperature range

(5 - 40) °C

Plug Types

-1, -2 or -4

Options
SRT-M45/37B

Needed to mount SRT-M37L lens adapter to the detector head VL-3701

SRT-M37Z-01

Ambient light shad made by elastic rubber to be used with SRT-M37L front lens adapter. Recommend for contact measurements as well.

Type Description File-Type Download
Datasheet VL-3701 with SRT-M37-L PDF
Produktname Product Image Description Show product
P-9710 High-quality device for measurement of CW-, single pulse and modulated radiation.

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X1 Four-channel USB optometer designed for mobile use.

Features: Compact device for use with all photometric, radiometric, colorimetric, plant-physiologic and photo-biologic measurement heads from Gigahertz-Optik. USB interface. Battery operation or power supply USB.
X1-RM Optometer in 3HE housing for use in 19” racks.

Features: Its USB and RS232 remote interface and two additional RS232 device interfaces make the device highly flexible when it comes to system integration. Its four signal inputs enable use with all photometric, radiometric, colorimetric, plant-physiologic and photo-biologic measurement heads from Gigahertz-Optik.
X1-PCB Optometer module.

Feature: The X1 optometer is available as a printed circuit board either with or without a housing and is suited for applications that do not require a keyboard or display. Four signal inputs enable connection with all measuring heads from Gigahertz-Optik.
P-2000 Two-channel optometer.

Features: For use with most photometric and radiometric detectors supplied by Gigahertz-Optik. Modes: CW, pulse energy from both single and multiple flashes, effective luminous intensity (Blondel-Rey), data logger and others.
P-9801 Eight-channel optometer.

Features: State-of-the-art 8 channel laboratory optometer with a signal amplifier and sample & hold ADC per channel for clocked recording of the measurement signals. RS232 and IEEE488 interface. Trigger input and output.
P-9802 Light meter for laboratory use with up to 36 measurement heads.

Features: For use with up to 36 photometric and/or radiometric measurement heads. RS232 interface.
TR-9600 High-speed 1µs or 100ns rise time data logger optometer.

Features: Laboratory device for recording of clocked intensity progress readings in single light flashes, flash sequence or modulated light. Calculation of pulse data e.g. peak intensity, pulse length, pulse half width , pulse energy and pulse repeat rate, etc.
P-9202-4 Fast response time trans-impedance signal amplifier.

Features: High quality analogue amplifier with current-voltage conversion. Minimal diode offset voltage for short circuit operations. Bandwidths of up to 330kHZ. 1µs rise time. Large I-U amplification range from 10pA/V to 1mA/V.
P-9202-5 Universal trans-impedance signal amplifier.

Features: High quality analogue amplifier with current-voltage conversion. Minimal diode offset voltage (1mV) for short circuit photodiode operations. 5µs to 20ms rise time depending on the amplification. Large I-U amplification range – 1×10-10A/V to 1×10-3 A/V.
P-9202-6 Highly sensitive trans-impedance signal amplifier.

Features: High quality analogue amplifier with current-voltage conversion with minimal diode offset voltage (0.5mV) for short circuit photodiode operation of . 2.5s to 25s rise time depending on the amplification. Large I-U amplification range – 1×10-11A/V to 1×10-4 mA/V.
Article-Nr Modell Description Request / Compare
Product
15295230 VL-3701-1

Detector with –1 connector, protective cap, calibration certificate

15295224 VL-3701-2

Detector head with –4 connector, protective cap, calibration certificate

15297138 VL-3701-4

Detector head with –4 connector, protective cap, calibration certificate

Calibration
15300659 KDW-P3-01

Calibration of the luminance responsivity with detector head VL-3701 

Miscellaneous
15295950 SRT-M37Z-01

Ambient light shade

Options
15295664 SRT-M45/37B

Adapter with M30x1 thread for the usage with 37mm and 45mm Diameter detector heads

15295665 SRT-M37L-1

1° FOV front lens

15295666 SRT-M37L-2

2° FOV front lens

15295668 SRT-M37L-5

5° FOV front lens

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