Digital Radiometer DLM-1000
The Gould-Bass DLM-1000 Digital Radiometer is a portable, 3-1/2 digit instrument that measures either blacklight intensity
in the spectral range of 320-400 nanometers in microwatts per square centimeter or visible light intensity of 380-700
nanometers (photometric response) in Lux or foot-candles, depending upon the sensor selected.
The latest LSI circuit design and display technology is used to achieve the lowest possible component count.
This, in turn, assures reliability, accuracy, stability, and rugged dependability. In combination with its functional
and aesthetic design, the Gould-Bass DLM-1000 is the easiest to handle blacklight, and visible light measuring
instrument available today. The “DigiGlo” LCD display provides constant fluorescent illumination with no battery draw.
Easy to Operate
§  Simply slide the power switch to the “On” position
§  Place the sensor where the irradiance/illuminance is to be measured
§  The irradiance/illumination is indicated on the DigiGlo LCD
§  Lux or foot-candles are indicated at 1 x the display reading
§  Microwatts/cm2 are indicated at 10 x the display reading
Features and Benefits
§  Meets AMS, ASTM, & Mil Standards
§  NIST Traceablilty assures meter accuracy
§  Includes visible light and black light sensors
§  UV sensor reads accurately 320-400 nm range
§  Visible light Lux or Foot-candle sensor option reads accurately 380-700 nm range
§  Visible sensor corrected to CIE curve
§  Constantly fluorescing LCD-DigiGlo Readout
§  Auto zeroing display requires no adjustment
§  Durable polymer case for rugged NDT use
§  Low battery indicator
§  Accuracy ± 5%
Technical Data
Model Number	DLM-1000	DLM-1000L (Lux)
Part Number	N410409001	N410410001
Sensors Included	N410400001 “B” UV Sensor N410401001 “C” White Light (Foot candles)	N410400001 “B” UV Sensor N410397001 “D” White Light (Lux)
Readout Display	13mm (0.5 in.) Constant fluorescing	13mm (0.5 in.) Constant fluorescing
Readout Sampling Time	0.4 Seconds	0.4 Seconds
Range	0-1999 Foot candles 0-19990 microwatts/cm²	0-1999 Lux 0-19990 microwatts/cm²
Spectral Range	“B” UV Sensor …. 320 – 400 nm “C” FC Sensor …. 380 – 700 nm	“B” UV Sensor …. 320 – 400 nm “D” Lux Sensor …. 380 – 700 nm
Power Requirement	One 9-volt battery (provided)	One 9-volt battery (provided)
Battery Life	150 – 200 Hours Current drain 2 mA (approx.)	150 – 200 Hours Current drain 2 mA (approx.)
Temperature Ranges: - Operation - Storage	0 – 50 Deg.C (32-122 Deg.F) 10 – 50 Deg.C (14-122 Deg.F)	0 – 50 Deg.C (32-122 Deg.F) 10 – 50 Deg.C (14-122 Deg.F)
Humidity Range	0 to 100% R.H. Non-condensing	0 to 100% R.H. Non-condensing
Dimensions: - Readout Unit Only - Sensor Head Only - DLM-1000 in Polymer Case	108mm x 73mm x 23mm 70mm x 52mm x 17mm 250mm x 190mm x 70mm	108mm x 73mm x 23mm 70mm x 52mm x 17mm 250mm x 190mm x 70mm
Weight	454 g (1 lb.)	454 g (1 lb.)
Recommended Calibration Interval	The DLM-1000 radiometer should be returned to the factory every six months for recalibration and routing inspection service. The recommended six month interval is based upon normal usage of intermittent readings. If the sensors are used continuously, recalibration should be performed more often. Visible sensors are calibrated to accurately read incandescent light sources, unless a fluorescent light calibration is requested.