Response Time Detector - TRD-200

Response Time and Flicker Detector

The TRD-200 is an optical instrument that is designed especially for response time and flicker measurements of flat panel displays such as cell phone and tablet displays, laptop displays, monitors, and LCD TVs.

The TRD-200 measures display response time and flicker and converts the time-varying luminance of a small measurement spot on the display into a signal that is digitized internally. The signal is transferred via USB to a PC and processed to determine response time and flicker using our RT-FL (Response Time & Flicker Kit) or our GL-RT (Gray Level Response Time) Kit.



Measure response time and flicker

High-speed instrument for fast response times and flicker measurements


No oscilloscope required

Internal 500KHz digitizer with USB interface. No need for oscilloscope or data acquisition cards


PMT based detector with peak gain adjustments

Sensitive PMT based light detector with photopic filter and peak detect gain adjustment designed to work with blinking displays


Product testing for quality assurance and quality control

Response time and flicker measurements of cell phone displays, tablets, flat panel monitors, and LCD TVs for QA/QC.

Product R&D and engineering

LCD and OLED display response time measurements for R&D and engineering.

Westar TRD-200 Response Time Detector Features

Powerful Temporal Response Detector

The TRD-200 includes internal data acquisition electronics which removes the need for data acquisition cards or digital oscilloscopes. The electronics provide control and data directly to a PC via a USB 2.0 bus. The TRD-200 uses a PMT based photo detector with microcontroller-based gain control, photopic filter, and collection optics. Key features include:

  • High-sensitivity PMT-based detector
  • C-mount for customizable optics
  • Internal data acquisition and memory
  • USB 2.0 interface
  • Microprocessor controlled gain adjustment
  • Peak detect gain adjustment – works with pulsed signals
  • “Auto protect” shut down if PMT is saturated

Intuitive Signal Analyzer Software

The Signal Analyzer provides control of the TRD and a graphical display of the time and frequency domain response of the incident light signal. The software analysis of rise time and fall time and analysis of flicker including flicker weighted according to the EIA/ISO human flicker sensitivity function. Key data acquisition features include:

  • 500KHz sample rate
  • 16-bit A/D resolution
  • 4 Mega-sample buffer
  • Trigger with adjustable Trigger Level
  • Positive / negative edge
  • External trigger input (TTL)
  • Peak detect gain adjustment – works with pulsed signals
Signal Analyzer Software for Response Time and Flicker


Westar TRD-200 Response Time Detector Diagram
Parameter Specification
Type Hamamatsu H10722-110
Spectral Response 230 nm to 700 nm
Frequency Bandwidth DC to 20 kHz
Lens Mount C-Mount (lens not included)
Data Acquisition
Sample Rate 500 KHz
A/D Resolution 16-Bit
Buffer 4 Mega-sample
Trigger Types Adjustable Trigger Level
Positive / Negative Edge
External Trigger Input (TTL)
Gain Adjustments Microprocessor controlled with peak detection (works with pulsed signals)
Parameter Specification
Signal Analyzer Software
Operating System Windows XP, 7
Spectral Response 230 nm to 700 nm
Features Signal Gain Setup, Sample Rate, Sample Time, Average Count, Window Functions, Trigger Modes, Signal Filtering, Response Time Bounds
Output Rise Time, Fall Time, Flicker, Frequency Domain Plot, Time Domain Plot
Dimensions (H x L x D) 90.37 mm x 43.64 mm x 139.67 mm
Weight 2 Lbs. (0.91 Kg)
Control Interface USB 2.0
Power 100-240 VAC, 50 or 60 Hz, 1.5A Max
Mounting ¼” x 20 Mounting Holes (2)
Optional Lens Standard
Fiber Optically Coupled Lens
Slit Aperture with CCD Viewfinder

Ordering Information

The standard TRD-200 includes:

  • TRD-200 Temporal Response Detector
  • USB Cable
  • AC Power Adapter
  • Signal Analyzer Software
  • TRD-200 User’s Manual

Three Lens Options

The TRD-200 has a C-mount that can work with compatible optics of your choice or you can order a lens from us.  We have three lenses available depending on your application.

FO: Fiber Optic

The “Fiber Optic” option uses a SMA-905 standard fiber optic coupler to receive the light signal from a fiber optically coupled (remote) source.

STD: Standard Objective Lens

The Standard objective lens and 1/16″ pinhole aperture with a working distance of 30 to 60 inches. Use the –STD input optics for most LCD types.

SAO: Slit Aperture Optics

The “Slit Aperture Optics” option uses a horizontal line aperture (slit mask emulation) instead of a circular spot. This allows a single display line to be measured and thus avoids Tr and Tf skew due to oversized spots. This adjustable-focus option is for LCDs with Tr and Tf specs less than 5 ms.

Want to find out more?

If you are interested in more information, send us an inquiry.