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+44 (0) 191 387 1923


Map replacement


Peak Test Services Ltd

152a Front Street
Co. Durham
United Kingdom
+44 (0) 191 387 1923

Contact Us

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About Peak Test

Founded in 1986, Peak Test is the UK leader in the distribution of test probes and receptacles, it carries the most comprehensive range of probes, many of which are available ex-stock for next day delivery.

Peak Test are the UK distributor for Virginia Panel Corporation (VPC) Mass Interconnect, Optomistic LED Test and Voltera Prototype PCB Printer.

Peak Test Services is an ISO accredited Company.

The leading UK distributor of Spring Contact Test Probes and Test Accessories

ULP S2 Penta Sensor

Part Number = ULP-S2-PCI/V

The S2 Penta Sensor is a best selling product that provides analog voltage outputs for both colour and intensity. It features built in colour binning, eliminating the need to convert LED wavelength to visual colour in the ATE software which saves valuable time. 


  • Response time <10mS capture time; <100mS overall response time for colour and intensity simultaneously
  • Output loads: 'Int. & colour' - 2Kohms min., 100pF, max.

Colour Response

  • Tests for the five main LED colours, plus white
  • Unambiguous and stable analog voltage output
  • Colour output is independent of LED intensity
    • ​Blue: 1.0 volts
    • Green: 1.5 volts
    • Yellow/Amber: 2.0 volts
    • Orange: 2.5 volts
    • Red: 3.0 volts
    • White: 3.5 volts

Intensity Response

  • Analog output ranging from 0 to 4 volts
  • Corresponds to LED's luminous intensity in millicandelas
  • C.I.E photopic-curve-corrected
  • Tests LEDs from 1 mcd to 20,000 mcd

High and Low Sensitivity options

This sensor is available in low and very low sensitivity options for extremely bright LEDs.

A high sensitivity option for very dim LEDs is also available.

  • Read-out <50mV indicates under ranging (LED is too dim) therefore please use part ULP-S2-PCI/V-HS (high sensitivity sensor)
  • Read-out <4 volts indicates over ranging (LED is too bright) therefore please use part ULP-S2-PCI/V-LS (low sensitivity sensor)

Intensity response depends on the size of the LED, the aperture of the fiber optic probe and the distance between the probe tip and the LED emitter. For detailed application notes, please contact us.