FLUKE 941 Light Meter User Manual

FLUKE 941 Light Meter

Specifications

• Product Name : Fluke-941 Light Meter
• Display: LCD
• Measurement Units: Lux / foot candles
• Features: MAX and MIN Lock, HOLD function, Manual range selection, AUTO ranging, Light sensor Zero Adjustment

Product Usage Instructions

Power On/Off
Press the Power Button to turn the device on or off.

Sensor Placement
Remove the sensor cap and position the sensor perpendicular to the light source for accurate readings.

Selecting Illuminance Scale and Range
Choose the appropriate Illuminance scale and range for your measurement needs.

Sensor Protection
After testing, replace the sensor cover to safeguard the filter and sensor.
Note: 1 foot-candle is equal to 10.764 Lux, and 1 Lux is equal to 0.09290 foot-candles.

FAQ

• What does the Fluke-941 Light Meter measure?
  The Fluke-941 measures visible light from fluorescent, metal halide, high- pressure sodium, or incandescent sources.

• How do I handle damaged or missing items in the package?
  If any items are damaged or missing, return the complete package to the place of purchase for an exchange.

• What is the warranty coverage for the Fluke-941 Light Meter?
  Fluke’s warranty covers refund of the purchase price, free repair, or replacement of defective products within the warranty period when returned to an authorized service center.

LIMITED WARRANTY AND LIMITATION OF LIABILITY

• Each Fluke product is warranted to be free from defects in material and workmanship under normal use and service. The warranty period is one year and begins on the date of shipment. Parts, product repairs, and services are warranted for 90 days. This warranty extends only to the original buyer or end-user customer of a Fluke authorized reseller, and does not apply to fuses, disposable batteries,
  or to any product which, in Fluke’s opinion, has been misused, altered, neglected, contaminated, or damaged by accident or abnormal conditions of operation or handling. Fluke warrants that software will operate substantially in accordance with its functional specifications for 90 days and that it has been properly recorded on non-defective media. Fluke does not warrant that software will be error free or operate without interruption.

• Fluke authorized resellers shall extend this warranty on new and unused products to end-user customers only but have no authority to extend a greater or different warranty on behalf of Fluke. Warranty support is available only if product is purchased through a Fluke authorized sales outlet or Buyer has paid the applicable international price. Fluke reserves the right to invoice Buyer for importation costs of repair/replacement parts when product purchased in one country is submitted for repair in another country.

• Fluke’s warranty obligation is limited, at Fluke’s option, to refund of the purchase price, free of charge repair, or replacement of a defective product which is returned to a Fluke authorized service center within the warranty period.

• To obtain warranty service, contact your nearest Fluke authorized service center to obtain return authorization information, then send the product to that service center, with a description of the difficulty, postage and insurance prepaid (FOB Destination). Fluke assumes no risk for damage in transit.

• Following warranty repair, the product will be returned to Buyer, transportation prepaid (FOB Destination).

• If Fluke determines that failure was caused by neglect, misuse, contamination, alteration, accident, or abnormal condition of operation or handling, including overvoltage failures caused by use outside the product’s specified rating, or normal wear and tear of mechanical components, Fluke will provide an estimate of repair costs and obtain authorization before commencing the work. Following repair, the product will be returned to the Buyer transportation prepaid and the Buyer will be billed for the repair and return transportation charges (FOB Shipping Point).

• THIS WARRANTY IS BUYER’S SOLE AND EXCLUSIVE REMEDY AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. FLUKE SHALL NOT BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES OR LOSSES, INCLUDING LOSS OF DATA, ARISING FROM ANY CAUSE OR THEORY.

• Since some countries or states do not allow limitation of the term of an implied warranty, or exclusion or limitation of incidental or consequential damages, the limitations and exclusions of this warranty may not apply to every buyer. If any provision of this Warranty is held invalid or unenforceable by a court or other decision-maker of competent jurisdiction, such holding will not affect the validity or enforceability of any other provision.

PRODUCT OVERVIEW

1. Light sensor
2. Display(LCD)
3. Lux / foot candles
4. MAX Lock up MIN and MAX value
5. Power Button: ON/OFF
6. Manual range selection
7. DATA HOLD button
8. AUTO ranging
9. Light sensor Zero Adjustment

Symbols

Warning and Precautions

• Do not operate the meter in explosive gas (material), combustible gas (material) steam or filled with dust.
• The light sensor is calibrated to CIE standard incandescent lamp at 2854 °K and may give different readings for spectrums from other lamp types.

UNPACKING AND INSPECTION

Your shipping carton should include:

• 1 941 light meter
• 1 9 volt battery
• 1 Users Manual

If any of the items are damaged or missing, return the complete package to the place of purchase for an exchange.

Introduction

• The 941 measures the visible light from fluorescent, metal halide, highpressure sodium or incandescent sources.
• One LUX (Lumen) is the illumination from a one candela lamp perpendicular to a surface one meter squared at a distance of one meter. One foot-candle (Fc) is the illumination from a one candela lamp perpendicular to a surface one foot squared at a distance of one foot.

Operation

1. Press the button to turn power on or off
2. Remove sensor cap and place the sensor perpendicular to the light.
3. Select Illuminance scale and range for reading.
4. When done testing, replace the sensor cover to protect the filter and sensor.

Lx / Fc
Illuminance scales. 1 foot-candle = 10.764 Lux and 1 lux = 0.09290 footcandles.

Data Hold
Freezes the reading present on the LCD at the moment the button is pressed. Press HOLD again to disable Data Hold

AUTO / MAN Ranging

Press the AUTO or MANual ranging button for useable reading. AUTO ranging is the default operation.

MIN/MAX

• Pressing the MIN/MAX button for less than 1 second will put the meter into a mode of displaying the maximum, minimum, or actual readings. Each time the MIN/MAX button is pressed, the meter will cycle from MAX MIN off.
• Select the proper measurement range before enabling the MIN/MAX feature.

Auto-Power Off
In order to save battery life, your light meter powers down automatically after approximately 6 minutes of inactivity. You can turn it back on by pressing the button. You can disable Auto Power Off by pressing and holding the HOLD button while turning the meter ON.

Zero
The light sensor will change the null point over time. To reset the null point, cover the sensor, press the ZERO button. The display will show “ADJ”. When the null reset is done, the display will read ‘00.0’.

Specification

• General:
  • Sampling Rate: 2.5 times per second for digital display.
  • Display: 3½ digit, 1999 count LCD
  • Sensor: Silicon photodiode and filter.
  • Environment: Indoor operation
  • Altitude: Up to 2000m.
  • Temperature / Humidity:
  • Operating: -10°C to 50°C, 0 to 80% RH.
  • Storage: -10°C to 50°C, 0 to 70% RH.
  • Power Supply: 9V NEDA 1604, IEC 6LR61
  • Battery life: 200 hours
  • Auto Power Off: approx 6 min
  • Dimension (Base): 130 x 63 x 38 mm (5.1 x 2.5 x 1.5”)
  • Dimension (Sensor): 80 x 55 x 29 mm (3.2 x 2.2 x 1.1”)
  • Weight: 220 g (.48 lb.) include battery
• Illumination:
  • Measuring Range: 20, 200, 2000, 20000, 200000 Lux 20, 200, 2000, 20000 Foot candles
  • Accuracy:
  • ± 3% (Calibrated to standard incandescent lamp at 2854°K)
  • ± 6% other visible light sources
  • Angle deviation from cosine Characteristics
  • 30° ± 2%
  • 60° ± 6%
  • 80° ± 25%

Maintenance and Repair

If there appears to be a malfunction during the operation of the meter, the following steps should be performed in order to isolate the cause of the problem.

1. Check the battery. Replace the battery immediately when the symbol  appears on the LCD.
2. Review the operating instructions for possible mistakes in operating procedure.
   Except for the replacement of the battery, repair of the meter should be performed only by a Factory Authorized Service Center or by other qualified instrument service personnel. The front panel and case can be cleaned with a mild solution of detergent and water. Apply sparingly with a soft cloth and allow to dry completely before using. Do not use aromatic hydrocarbons or chlorinated solvents for cleaning.

Battery Replacement

1. Turn off the meter and slide out the battery cover. Replace the battery with a NEDA type 1604 or equivalent 9V alkaline battery. Replace the cover.
2. Remove battery when the Fluke-941 is not used for extended period.

References

• Fluke Registration

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