versatile hand-held optometer
Hand-held Meter
The X1 optometer is one of the most versatile hand-held light measurement instruments available. It combines a powerful electronic design packaged in a light-weight ergonomic housing. Its compact size makes it ideal for field service applications. A unique feature of the X1 is its capability to operate detector heads housing up to four photodiodes with all four signals displayed on the four line display with on/off backlighting. When more than one detector head is used simple and faultless selection of the calibration data is accomplished using the X1’s menu mode.
Simple to Use
Operating the X1 is simple. The meter set-up is supported by an easy to use menu. The menu allows selection of the operating mode, the detector and measurement parameter. Once set-up all settings are stored and recalled on next power-up unless reinitialized. Measurement values are displayed in absolute quantities for the particular detector connected. The X1-1 is compatible with detectors that have -4 connectors. Calibration factors are stored in the X1-1.
The latest version X1-5 offers compatibility with detectors that have -5 connectors. These connectors include calibration data in Eeprom storage within the connector and hence correct data is always read directly from detector. Detector heads with -5 connectors can be readily interchanged when used with the X1-5 optometer.
Battery or USB powered
For on-site applications the X1 is operated with two standard 1.5 V AA batteries. In remote control operation the X1 is powered through the USB interface.
Four-channel Meter
The unique feature of the X1 is the capability to operate multi-cell detector heads with up to four photodiodes with all four signals displayed or read-out via the USB interface.
Multipurpose Light Measurement Instrument
The X1 can be combined with most of the Gigahertz-Optik single cell or multi cell light detector heads for use in a wide application range of radiometric, photometric and colorimetric measurements
Interfaces
The X1 features a USB interfaces.

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Short description | Optometer for the individual configuration as photometer, RGB-luminous Color meter, Radiometer, UV-radiometer, LASER-powermeter etc. with the detector heads supplied. |
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Main features | Compact gauge in ergonomic design for one Hand control. Four measurement chanels in multiplex operation for use with single and multi-chanel detectors heads. Back illuminated Display with four lines. Battery powered with two AA cells. USB-Interface. User Software and Software development kit available. |
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Measurement range | Wide dynamic current measurement range from 0.1 pA (noise equivalent signal) up to 200 µA. Seven gain ranges with manual or automatic selection. Measurement range in absolute units with given by the detector heads responivity and calibration. |
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typical applications | Measurement device for mobile use: measuremen of the illuminance condition, measurement of lamp aging, etc. Because of ist USB Interface and the Software development kit the device can be integrated in remote applications. |
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Calibration | Calibration and comparison of the current responsivity in each of the seven gain ranges. Memory for calibration data of several detector heads for measuremen in the absolute unit of the selected detector head. |
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Detector interface | 9pin MDSM9 socket, 4 inputs |
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Measurement range | Seven (200 μA to 0.1 pA) manual or auto range which can be set by the user. The default setting depends on the customer specific configuration.
*) The measurement uncertainty is usually below the calibration uncertainty, but must also be considered. At very low currents, a detailed examination of the measurement uncertainty analysis is recommended, because in this case the measurement uncertainty can predominate. **) internal zero adjustment can reduce the bias current. Maximum zero adjusted bias current = ±0,2pA. ***) only for instrument versions with 7 measuring ranges ****) valid for currents above 10pA |
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CW integration time | 1 ms – 1 s |
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sampling rate | internal sampling rate ADC 250 µs |
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Offset correction | Correction range transcending |
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Parameter adjustment | Remote control or front panel buttons (menu), set values permanently stored (EEPROM) |
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Calibration | max. 256 Datasets stored in EEPROM |
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Menu guide |
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Dose |
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Miscellaneous | |||||||||||||||||||||||||||||||||||||||||||||||||
Power Supply | Two AA batteries ~ 250 hrs. operation time - backlit display off |
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Interface | USB V1.1 (HID Device)
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temperature range | Operating: (5 to 40) °C |
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Humidity | <80%, non-condensing |
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Display | LCD graphic display 97 x 32 pixel |
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Front panel control | 3 buttons, menu system |
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Dimensions | 145 mm x 63 mm x 30 mm |
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compatibel |
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Weight | 150 g |
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Info | Regular recalibration of the current calibration is recommended. Especially when very small measurement currents have to be measured. In the case of very high humidity, fault currents of the radiometer are possible at low measuring currents and should be taken into account. |
Produktname | Product Image | Description | Show product |
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VL-3701 | ![]() |
Detector head for the measurement of photopic illuminance in Lux [lx]. Features: f1 ≤ 3 %, f2 ≤ 1.5 %, 0.5 nA/lx, 20mm height, for the usage with Optometers and amplifiers, calibration certificate |
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VL-3702 | ![]() |
Detector head for the measurement of photopic illuminance in Lux [lx]. Features: f1 ≤ 6 %, f2 ≤ 3 %, 0.5 nA/lx, 20mm height, for the usage with Optometers and amplifiers, calibration certificate |
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VL-3704 | ![]() |
Detector head for the measurement of photopic illuminance in Lux [lx]. Features: f1 ≤ 5 %, f2 ≤ 3 %, 20pA/lx, 20mm height, for the usage with Optometers and amplifiers, calibration certificate |
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VL-3705 | ![]() |
Detector head for the measurement of scotopic illuminance in Lux [lx]. Features: f1 ≤ 5 %, f2 ≤ 3 %, 0.2nA/lx, 20mm height, for the usage with Optometers and amplifiers, calibration certificate |
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PD-9310A | ![]() |
High sensitive detector head for the measurement of photopic illuminance in Lux [lx]. Features: f1 ≤ 3 %, 2.8nA/lx, 20mm diffuser, for the usage with optometers and amplifiers, calibration certificate |
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PD-9310B | ![]() |
High sensitive detector head for the measurement of photopic illuminance in Lux [lx]. Features: f1 ≤ 6 %, 2.8nA/lx, 20mm diffuser, for the usage with optometers and amplifiers, calibration |
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PD-9310B-N | ![]() |
Very high sensitive detector head for the measurement of photopic illuminance in Lux [lx]. Features: f1 ≤ 3 %, 28nA/lx, no diffuser, for the usage with optometers and amplifiers, calibration |
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VL-1101 + UMPA-0.5-11-RD Detector head | ![]() |
Module detector head for the measurement of photopic illuminance in Lux [lx]. Features: UMPA adapter for usage with integrating spheres, for the usage with optometers and amplifiers, calibration certificate |
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VL-3701 with SRT-M37-L | ![]() |
Detector head to measure the photopic illuminance in lx and the luminance in cd/m². Features: front lenses with 1°, 2° or 5° viewing angle, for the usage with Optometers and amplifiers, calibration certificate |
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PD-9310 with SRT-M37-L | ![]() |
High sensitive detector head to measure the photopic luminance in cd/m². Features: front lense for 1°, 2°, 5° or 10° viewing angle, for the usage with Optometers and amplifiers, calibration certificate |
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VL-1101 | ![]() |
Photometric detector head with VL-11 mount. Features: modular detector for use with integrating spheres, front lenses etc. For use with optometers and signal amplifiers |
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PD-9304 | ![]() |
Universal detector head for LASER power, illuminance and 400-1100 nm iiradiance. Features: Si-photodiode with 1 cm², exchange able filters and cosine diffuor, for the usage with optometers and signal amplifiers |
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RW-3701 | ![]() |
Detector head for the measurement of irradiance in W/m². Features: spectral responsivity from 400-500nm (BLUE), cosine field-of-view, for the usage with optometers and amplifiers, calibration certificate. |
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RW-3702 | ![]() |
Detector head for the measurement of irradiance in W/m². Features: spectral responsivity from 700-800nm (RED), cosine field-of-view, for the usage with optometers and amplifiers, calibration certificate. |
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RW-3703 | ![]() |
Detector head for the measurement of irradiance in W/m². Features: spectral responsivity from 400-800nm (VIS), cosine field-of-view, for the usage with optometers and amplifiers, calibration certificate. |
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RW-3704 | ![]() |
Detector head for the measurement of irradiance in W/m². Features: spectral responsivity from 800-1000nm (NIR), cosine field-of-view, for the usage with optometers and amplifiers, calibration certificate. |
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RW-3705 | ![]() |
Detector head for the measurement of irradiance in W/m². Features: spectral responsivity from 400-1000nm (VISNIR), cosine field-of-view, for the usage with optometers and amplifiers, calibration certificate. |
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RW-3708 | ![]() |
Detector head for the measurement of irradiance in W/m². Features: spectral responsivity from 950-1700nm (NIR), cosine field-of-view, for the usage with optometers and amplifiers, calibration certificate. |
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UV-3701 | ![]() |
Detector head for the measurement of irradiance of UV radiation in W/m². Features: spectral responsivity from 315-400nm (UV-A), cosine field-of-view, for the usage with optometers and amplifiers, calibration certificate. |
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UV-3702 | ![]() |
Detector head for the measurement of irradiance of UV radiation in W/m². Features: spectral responsivity from 280-315nm (UV-B), cosine field-of-view, for the usage with optometers and amplifiers, calibration certificate. |
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UV-3703 | ![]() |
Detector head for the measurement of irradiance of UV radiation in W/m². Features: spectral responsivity from 200/250-280nm (UV-C), cosine field-of-view, for the usage with optometers and amplifiers, calibration certificate. |
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UV-3710 | ![]() |
Detector head for the measurement of irradiance of UV radiation in W/m². Features: spectral responsivity from 320-400nm (UV-A), cosine field-of-view, for the usage with optometers and amplifiers, calibration certificate. |
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UV-3711 | ![]() |
Detector head for the measurement of irradiance of UV radiation in W/m². Features: spectral responsivity from 280-320nm (UV-B), cosine field-of-view, for the usage with optometers and amplifiers, calibration certificate. |
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UV-3716 | ![]() |
Detector head for the measurement of irradiance of UV radiation in W/m². Features: spectral responsivity from 305-400nm (UV-A), cosine field-of-view, for the usage with optometers and amplifiers, calibration certificate. |
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UV-3717 | ![]() |
Detector head for the measurement of irradiance of UV radiation in W/m². Features: spectral responsivity from 325-400nm (UV-A), low cross talk from radiation > 400 nm, cosine field-of-view, for the usage with optometers and amplifiers, calibration certificate. |
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UV-3719 | ![]() |
Detector head for the measurement of irradiance of UV radiation in W/m². Features: spectral responsivity from 250-400nm (UV), cosine field-of-view, for the usage with optometers and amplifiers, calibration certificate. |
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UV-3720 | ![]() |
Detector head for the measurement of irradiance of UV radiation in W/m². Features: spectral responsivity from 240-320nm (UV), cosine field-of-view, for the usage with optometers and amplifiers, calibration certificate. |
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UV-3718 | ![]() |
Detector head for the measurement of high irradiance of UV-C 254nm radiation in W/m². Features: pre-aging for long time stability, cosine field-of-view, metal shielded cable, for the usage with optometers and amplifiers, calibration certificate. |
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RCH-102 | ![]() |
Detector head for high intensity irradiation in UV or blue light curing processes. Features: Separate light integrator and detector with rigid fiber coupling, (320-460)nm UVABLUE responsivity, wide viewing angle, for the usage with optometers and amplifiers, calibration certificate. |
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PD-11 series | ![]() |
Detector head with DP-11 mount. Features: modular detector for use with integrating spheres, front lenses etc, Si, SiLP, InGaAs, SiC, GaP photodiodes, for use with optometers and signal amplifiers |
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UV-3706 | ![]() |
Detector head to measure irradiance W/m2 in Bilirubin phototherapy. Features: Bilirubin actinic responsivity, cosine field-of-view, for usewith optometers, calibration certificate. |
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UV-3711-308 | ![]() |
Detector head for the measurement of irradiance of 308nm Eximer Lasers in W/m². Features: flat spectral responsivity besite 308nm. cosine field-of-view, dose measurement in conjuntion with P-9710-2 optometer, calibration certificate |
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UV-3709 | ![]() |
Detector for Blue-light hazard measurements. Features: Single-cell detector, BLH actinic irradiance, for the use with optometer, calibration certificate |
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UV-3725 | Detector for the measurement of UV-C 254 nm irradiance in air disinfection applications. Features: wide dynamic range for UV hazard and effective irradiance, wide angle cosine F.O.V. for straylight measurements, for the usage with optometers, calibration certificate. |
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RW-37 with SRT-M37-L | ![]() |
Detector heads to measure the irradiance in W/m² and the radiance in W/(m²*sr). Features: front lenses with 1°, 2° or 5° viewing angle, for the usage with Optometers and amplifiers, calibration certificate |
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S-SDK-X20 | ![]() |
Software Development Kit for X20 variants (X1 and HCT99). | |
S-X1 | ![]() |
Application software for X1 variants. |