RS-7-4: Wafer Prober Illuminator for CMOS/CCD Wafer Testers

This configuration of the SpectralLED Tunable LED Light Source is a turnkey, drop-in addition to commercially available systems for wafer level testing of CCD and CMOS sensors. Specifically, the RS-7-4 SpectralLED™ bolts directly on to existing image sensor testers from manufacturers such as Teradyne and National Instruments, and can also be readily adapted to test head manipulators and handler instrumentation custom-built by end users. It can then be easily programmed to deliver virtually any desired spectral power distribution of visible light reproducing the output of black body sources and various standard CIE illuminants, for example, over a wide range of output luminance. This enables rapid automation for accurate characterization of detector dynamic range, uniformity, linearity and spectral responsivity, and also facilitates identification of pixel defects.

The RS-7-4 is a modular light source which provides uniform illumination inside the image sensor tester. Simple API allows for easy integration and control of the SpectralLED output. Example image sensor testers include: Agilent, Teradyne, National Instruments, Yokogawa, Advantest, Cascade Microtech


  • Unprecedented Resolution and Accuracy – 32 Discrete LED Wavelengths Covering the Visible and NIR
  • Powerful Synthesis Engine – Quickly Simulate any CIE Illuminant or Macbeth™ / X-RITE™ Color Patch
  • Flexible Interface – Built-in RMS Spectral Fitting for Simulation of Any User Imported Spectra
  • Uniform 75mm Radiance Output Port or Optional Baffle Tube for Irradiance
  • Easily Adaptable – for Automated Test Systems and Production Line Integration
  • Pure DC Constant Current Drivers and Built-in Optical Feedback Photodiode System – Ensure Accurate Output in Real Time
  • On-board Thermal Electric Cooler and Feedback – for LED Temperature Control
  • ISO/IEC 17025 NVLAP Calibration Laboratory (Lab Code 200823-0) – Ensures Superior Wavelength and Color Accuracy

Unlimited possibilities for limitless spectra. With independent 16-bit control on 35 LED channels, there are virtually infinite possibilities for what the SpectralLED can do for you. Compared with other “next-gen” LED light sources, the SpectralLED offers more channels, brighter output, higher accuracy, and more powerful features for simulation. No external software is required, the SpectralLED firmware controls RMS fitting, calibration storage, and presets. Direct integrating into production lines or test systems is easy with universally compatible USB and RS-232 interfaces.

Gamma Scientific SpectralLED light sources feature a proprietary electrical design for superior accuracy and reliability. The completely redesigned drive electronics provide a pure DC constant current LED drive with floating differential sensing. This means there is no flicker and no uncertainty in the drive current. Couple that with built-in optical feedback, and the SpectralLED is able to accurately control optical output power to within a fraction of a percent. On-board thermal control maintains the LED substrate temperature to ensure spectrum is stable even at high drive currents.

As a world leader in high performance spectroradiometers, and with an in-house ISO/IEC 17025 NVLAP Accredited Calibration Laboratory (Lab Code 200823-0), you can trust Gamma Scientific’s NIST-traceable calibration that comes programmed into every SpectralLED® source.

Spectral Range380nm – 1000nm (Standard Version, Custom Configurations Available)
Spectral Output32 Discrete LED Channels, 3 Broadband LED Channels
Visible Resolution ≈15nm, NIR Resolution ≈50nm (Typical Channel Spacing)
Spectral Peaks1395nm, 405nm, 420nm, 430nm, 450nm, 460nm, 475nm, 495nm,
505nm, 520nm, 525nm, 535nm, 570nm, 595nm, 610nm, 700nm,
620nm, 630nm, 637nm, 660nm, 675nm, 685nm, 715nm, 730nm,
750nm, 760nm, 780nm, 805nm, 850nm, 895nm, 940nm, 965nm,
2700K Warm White, 3000K Warm White, 6500K Cool White
(Standard Version, Custom Configurations Available)
Spectral BandwidthChannel Dependent
Visible Typical ≈20nm FWHM, NIR Typical ≈50nm FWHM
CCT Range1,900K – 40,000K
Preset SpectraCIE Illuminants A, B, C, D50, D55, D65, D75, E, F1-F12,
Macbeth™/X-Rite™ Color Patches
Custom Preset SpectraArbitrary Spectra can be Configured as Presets Using API
Gamma can Provide Factory Loaded Custom Presets, Use Part Number RS-7-PRE
(Spectral Information must be Provided by Customer at Time of Order)
Illumination Stability≥ 99.99% after settling
(Channel Dependent, Settling Occurs After ≈50ms for Radiance and ≈2000ms for Color)
Illumination Accuracy± 1% Absolute NIST Traceable, Calibration Stored Internally
Spectral Accuracy± 1nm Centroid Wavelength
Color AccuracyCIE 1931 x,y = ±0.003
Linearity< 0.1% RMS of full scale
Temperature StabilityActive Thermoelectric Cooler with Feedback, Temperature Control within ± 1 C°
Long Term DriftOutput: ≤ 0.2%
Spectral: ≤ 1nm (Typical, Channel Dependent)
Electrical Resolution16 bit DAC for Channel Current Drivers
(64 Independent DACs, Certain LED Channels Require Multiple Current Drivers)
24 bit ADC for Internal Radiance Monitor/Feedback
Dynamic Range AdjustmentSpectrum Dependent, 4-5 Decades Typical
LED ControlPure DC Constant Current with Floating Differential Sensing
SoftwareFirmware Contains Full Spectral Calibration and Handles Spectral Fitting, Preset Storage, Real-time Optical Feedback, Radiometric and Photometric Units Supported.
InterfaceUSB 2.0 Type B Connector and DB-9 Connector
Interface ProtocolSimple ASCII Commands with Optional Binary Block Transfer
Supported Operating SystemsUSB Drivers for Windows, OSX, and Linux via FTDI virtual COM port
Legacy RS-232 Serial Port for Integration into Automated Systems (no OS required)
Input Voltage and Power110-240 VAC, 50-60Hz, 600W Maximum
System DimensionsHeight: 405mm (16in), Width: 460mm (18.1in), Depth: 305mm (12in), Weight: 17.5kg (38.6lbs)
RS-7-WAVEMONMulti-channel photodiode system provides amplitude feedback and real-time wavelength measurements. This assembly is a discrete module and can be used with any RS-7 optical configuration.

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