The Colorimetry Research CR-250RH is a compact, high-resolution spectroradiometer with a 4nm bandwidth and 1.6nm/pixel optical resolution. This specification is normally only found on spectrometers that cost from many £10,000's.
- ColourSpace Integration
- Large 20+mm Spot Size
- 4nm Spectral Bandwidth
- ±0.3nm Spectral Accuracy
- 0.02 to 154,000 cd/m2
- Solid Machined Aluminium & Stainless Steel Construction
Uniquely, the CR-250RH has a large 20+mm spot size, with small divergence angle, making it ideal for contact and non-contact measurement of all displays and projectors, and is designed for all display types, including projection and all luminous display technologies, in contact and non-contact modes.
Construction is extremely rugged, made of machined aluminium and stainless steel, with all optical components fixed to ensure no optical misalignment can occur, and weighs only 1 pound (0.45kg).
All CR-250RH probes are calibrated using NIST traceable calibration standards at a colour temperature of 2856 Kelvins, using a laboratory grade scanning double monochromator and high accuracy filters of known transmittance and chromaticity. Essentially, no other spectroradiometers are used during manufacturing and Q.A. because none of them are as accurate as a laboratory grade scanning double monochromator.
- Detector: CMOS image sensor, 256 pixels
- Spectral Range: 380–780 nm
- Spectral Bandwidth: 4 nm
- Spectral Accuracy: ±0.3 nm
- Spectral Resolution: 1.6 nm / pixel
- Luminance Range: 0.02-154,000 cd/m2
- Luminance Accuracy: ±2 % (measured with NIST traceable 2856K light source, at 1.7 cd/m2)
- Luminance Repeatability: ≤1 % (measured with NIST traceable 2856K light source, at 1.7 cd/m2)
- Chromaticity Accuracy: ±0.0015 x,y (measured with NIST traceable 2856K light source, at 1.7 cd/m2)
- Chromaticity Repeatability: 0.0005 x,y (measured with NIST traceable 2856K light source, at 1.7 cd/m2)
- Polarization error: ≤0.5%
- Digital Resolution: 16 bits
- Objective Lens: 50 mm, 60 mm, 75 mm, 100 mm (50 mm is the standard lens - all others are special order)
- Measurement Spot Size: 20mm at end of hood; 22.6mm at 100mm from hood
- Spot Size Calculation: = 20mm +0.026*distance to object for 50mm lens
- Custom Synchronisation: 10 - 10000 Hz
- Exposure Time Range: 0.02 to 30 seconds
- Power Requirements: 5V, 120 mA (600 mW) via USB 2.0
- Interface: USB 2.0
- Weight: 0.45 Kg
The CR-250RH has been designed specifically for the professional calibrator, providing a large spot size with contact measurement combined with a small divergence angle that keeps the measurement spot size within desired dimensions for distance calibration, as with projectors.
The rubber hood allows the probe to be positioned against screen surfaces, providing a shield for for stray ambient light.
- USB 2.0 Cable
- Universal Mounting Bar
- Rubber Hood
- Dual meter mount (standard with 2nd probe)
- Long reach meter mount extension bar (free with 2nd probe)
- Cosine/Illuminance Receptor (optional ~ £395)
- ND Filters (optional ~ £395 each)
- Filter holder (optional ~ £130)
Note: ND filters and Cosine Receptors must be calibrated with the unit. If a ND filter or Cosine Receptor is purchased after the unit has shipped from the factory the unit must be shipped back to the factory in order to get the added accessory properly calibrated with the unit.
The CR-250RH or CR-250 should be factory recalibrated/re-certified every year to two years, depending on usage and storage, or when obvious issue are found (after physical shock to the probe for example).
Cost is $650 USD, plus shipping.
Contact Colorimetry Research to schedule recalibration/re-certification.
An alternate to the CR-250RH is the CR-250, for use with optional VO-201 Viewing Optics.
The CR-250 also comes with a removable Rubber Hood for contact use, and provides the same sensitivity and capabilities as the CR-250RH.
CR-250 & VO-201
As with all probes, CR-250 operation and function is controlled via the Probe Options menu, accessed via the Profiling window.
The CR-250 has options that are directly associated with the probe - Speed, which control the maximum auto exposure time, Sync Frequency, which controls the synchronisation of the probe with the display's refresh rate, and probe Calibration Settings (Matrix pre-sets) - as well as generic probe settings, such as Extra Delay Time, Probe Matching, Probe Offset, etc.
Calibration Settings provides generic probe settings, and Colour Matching Presets.
Colour Matching Presets
The Drop-down menu provides access to any Colour Matching Functions held within the CR-100.
Colour Matching Functions are aimed at correcting for Metameric colour failure.
Average Low Light
Average Low Light is a probe generic option, that averages multiple readings in low-light situations using an advanced algorithm built into ColourSpace. The algorithm varies based on the probe in use to provide the best possible results.
Speed sets the exposure time.
1=Slow: 30 sec exposure + 30 sec dark measurement
2=Normal: 7.5 sec exposure + 7.5 sec dark measurement
3=Fast: 3.75 sec exposure + 3.75 sec dark measurement
4=2xFast: 1.875 sec exposure + 1.875 sec dark measurement
Sync Frequency defines the sync frequency of the probe, with None being the default, although Manual can be used if the refresh rate of the display is known. Auto is not used.
Extra Delay Time
Extra Delay sets a time after the patch has been changed before probe measurement starts.
This can deal with delays in the image pipeline.
Probe Matching is really unnecessary with the CR-250, as it is a Spectroradiometer.
The options is provided on a Why Not basis...
Probe Offset enables a user to manually enter offset values for different probes/display combinations.
Perceptual Colour Match is a preferable approach.