Ht309 Handheld Digital Led-light Lux Meter User Manual

309 Handheld Digital LED-Light Lux Meter
User Manual

PRECAUTIONS AND SAFETY MEASURES

The instrument has been designed in compliance with the safety directives relevant to electronic measuring instruments. In order to prevent damaging the instrument, please
carefully follow the procedures described in this manual and read all notes preceded by the symbol with the utmost attention. Before and after carrying out the measurements,
carefully observe the following instructions:

• Do not carry out any measurements in case gas, explosive materials or flammables are present, or in dusty environments
• Do not carry out any measurements in humid environments
• Do not carry out any measurement in case you find anomalies such as deformation, breaks, substance leaks, absence of display on the screen, etc.
• Do not touch the photodiode sensor while carrying out measurements, in order to prevent any damage to the instrument caused by static electricity or contamination

The following symbol is used in this manual:
Caution: observe the instructions given in this manual. Improper use could damage the instrument and/or its components.

PRELIMINARY INSTRUCTIONS

In order to prevent incorrect reading, replace the battery when the symbol “ ” appears on the display when switching on the instrument.

 DURING USE

Please carefully read the following recommendations and instructions.
CAUTION
Failure to comply with the Caution notes and/or Instructions may damage the instrument and/or its components or be a source of danger for the operator.
While measuring, if the value or the sign of the quantity being measured remains unchanged, check if the HOLD function is enabled.

AFTER USE

• When the measurement is complete, switch off the instrument.
• If the instrument is not to be used for a long time, remove the battery.

GENERAL DESCRIPTION

The instrument is a precision digital lux meter, mainly used for measuring illuminance of both white light sources and LED sources of various colors, expressed in Lux (Lx) or Foot-candles (Fc). The instrument complies with CIE (International Commission on Illumination) standards on spectrum response and corrects according to the cosine of the angle of incidence of light. The silicon photodiode sensor guarantees measurement stability.
The instrument has the following functions:

• Illuminance measurement up to 400kLux / 40kFc
• Luminous intensity measurement (expressed in Candles)
• Selection of the measuring unit: Lx/Fc/CD
• Light source: white light source and LED sources in their visible spectrum
• High-precision and rapid measurements
• Data HOLD function
• MAX/MIN/AVG functions
• Zeroing of the displayed value
• Internal memory for saving measurement results
• Auto Power OFF
• Backlight
• Autorange

PREPARATION FOR USE

INITIAL CHECKS

Before shipping, the instrument has been checked from an electric as well as mechanical point of view. All possible precautions have been taken so that the instrument is delivered undamaged. However, we recommend generally checking the instrument in order to detect possible damage suffered during transport. In case anomalies are found, immediately contact the forwarding agent. We also recommend checking that the packaging contains all components indicated in § 7.3. In case of discrepancy, please contact the Dealer. In case the instrument should be returned, please follow the instructions given in § 8

INSTRUMENT POWER SUPPLY

The instrument is powered by a single 9V alkaline battery type NEDA1604, JIS006P, IEC6F22 included in the package. In order to prevent battery discharge, it has not been inserted into the instrument. For battery installation, follow the instructions given in § 6.1. The “ ” symbol appears when the battery is flat. Replace the battery by following the instructions given in § 6.1.

STORAGE

In order to guarantee precise measurement, after a long storage time under extreme environmental conditions, wait for the instrument to come back to normal condition (see § 7.2.1).

NOMENCLATURE

INSTRUMENT DESCRIPTION

CAPTION:

1. Input terminal 2. LCD display 3. LX/FC/CD key 4. MAX MIN key 5. HLD key 6. MEM/READ key

7. arrow key 8. /SRC key 9.  arrow key 10. ZRO key 11. ON/OFF key 12. Photodiode sensor

DISPLAY DESCRIPTION

CAPTION:

DESCRIPTION OF FUNCTION KEYS

ON/OFF key
Pushing the ON/OFF key permits them to turn on and off the instrument. The same key is used also to disable the Auto Power OFF (APO) feature (see § 4.3.9).
LX/FC/CD key
Press the LX/FC/CD key to select the measuring unit of illuminance, choosing between the two available options “LUX” and “FC” (1Fc = 10.764Lux; 1Lux = 0.09290Fc).
Press longer LX/FC/CD (>1s) in order to select the measuring unit of luminous intensity (see § 5.2)
HLD key
By pushing the HLD key the instrument’s measured value is frozen on the display and the symbol “HOLD” appears on it. The HOLD function is not active with MAX, MIN, or AVG features enabled.
MEM/READ key
Press the MEM/READ key to save the datum shown on the display in the internal memory. The indication of the memory location (max. 99 locations) and the symbol “M” (see Fig. 2 – parts 1 and 2) appear for a while at the top left part of the display
Press longer LX/FC/CD (>1s) allows recalling the data saved in the internal memory on the display. The symbol “R” with the number of the last memory location used is shown on the top left part of the display. Use the arrow keys or to select memory locations. The display shows the corresponding saved value. Press again longer LX/FC/CD (>1s) to exit the function
Deleting the internal memory
To delete the internal memory, proceed as follows:

1. Switch off the instrument using the ON/OFF key.
2. Press and hold the MEM/READ key while switching on the instrument with the ON/OFF key. The message “CLR” is shown on the display for a few seconds and the number of the memory location is taken back to “00”.

MAX MIN key
Press the MAX MIN key to view the Minimum, Maximum, and Average (AVG) values of the measured quantity. The values are constantly updated and are displayed cyclically every time the same key is pressed. The symbols “MIN”, “MAX” and “AVG” appear on the display. Press longer MAX MIN (>1s) to exit the function.
ZRO key
Press the ZERO key to carry out the automatic zeroing of the value on the display in case the indication “000” should be absent when placing the protection cover onto the photodiode sensor. The message “AdJ” is shown on the display during this operation. The message “CAP” is shown on the display in case the ZRO key is pressed with the protection cover not positioned on the sensor. Insert the cover and repeat the operation, if necessary.
/SRC (Light Source) key
Press the /SRC key to active/disable the display backlight
Press the longer /SRC (>1s) key in order to select the light source to be measured. Proceed as follows:

1. On the sub-display, observe the flashing symbol “Lx”, where 0 < x < 9 indicates the source number.
2. Use the arrow keys or to select the desired source among the available options L0 ÷ L9 (see Table 1)
3. Press the /SRC key to set a possible correction factor on the instrument’s reading (only for custom sources L7, L8, and L9). The indication of the parameter value flashes on the display. Use the arrow keys or to set (press and hold the keys for rapid operation) the value between 0.001 and 1.999. The values of the sources L0 ÷ L5 cannot be modified
   Table 1: List of available sources 

   The symbol on the display	Source type	Correction factor
   L0	Standard light	1.000
   L1	White LED	0.990
   L2	Red LED	0.516
   L3	Yellow LED	0.815
   L4	Green LED	1.216
   L5	Blue LED	1.475
   L6	Purple LED	1.148
   L7	Custom	1.000
   L8	Custom	1.000
   L9	Custom	1.000

4. Press longer /SRC (>1s) to confirm the operation. The symbols stop flashing on the display.

Disabling the Auto Power OFF function
In order to preserve the instrument’s internal battery, the instrument switches automatically off approximately 5 minutes after it was last used. The symbol “ ” appears on the display.
To disable the Auto Power Off function, proceed as follows:

• Switch on the instrument.
• Press the longer ON/OFF key (>1s). The symbol “ ” disappears from the display
• Press again longer ON/OFF key (>1s) or switch off and then on again the instrument to automatically enable the function

OPERATING INSTRUCTIONS

ILLUMINANCE MEASUREMENT

1. Insert the protection cover onto the photodiode sensor.
2. \Switch on the instrument using the ON/OFF key.
3. If necessary, zero the display by pressing the ZRO key (see § 4.3.7).
4. Select the measuring unit Lux or Fc on the instrument by pressing the LX/FC/CD key (see § 4.3.2).
5. Select the type of source to be tested by pressing and holding the /SRC key for more than 1 second (see § 4.3.8). The standard source is type “L0”.
6. Position the sensor horizontally and perpendicularly with respect to the source to be tested. The illuminance value is shown on the display, with automatic scale change.
7. Press the HLD key, if necessary (see § 4.3.3) to freeze the value shown on the display.
8. Press the MEM/READ key (see § 4.3.4) to save the datum, read it in real-time and show it on the display, in the memory.
9. Cover the sensor and switch off the instrument at the end of the measurement.

LUMINOUS INTENSITY MEASUREMENT

Luminous intensity, expressed in Candles (CD), is calculated by the instrument according to the following formula:
Luminous intensity (CD) = Illuminance (Lux/Fc) x Distance from source (m²/ft² )

1. Insert the protection cover onto the photodiode sensor.
2. Switch on the instrument using the ON/OFF key.
3. If necessary, zero the display by pressing the ZRO key (see § 4.3.7).
4. Select the measuring unit on the instrument by pressing the longer (1s) LX/FC/CD key. The symbol “CD” is shown on the display.
5. Use the arrow keys or to select the measuring unit of distance “m” or “ft” (see Fig. 2 – part 12) and confirm with LX/FC/CD
6. Select the type of source to be tested by pressing and holding the /SRC key for more than 1 second (see § 4.3.8). The standard source is type “L0”
7. Set the value of the distance between the measured point and the light source using the arrow keys or in the ranges 0.01m ÷30.347m or 0.01ft ÷99.99ft and confirm with the LX/FC/CD key
8. Position the sensor horizontally and perpendicularly with respect to the source to be tested. The value of luminous intensity is shown on the display, with automatic scale change.
9. Press the HLD key, if necessary (see § 4.3.3) to freeze the value shown on the display.
10. Press the MEM/READ key (see § 4.3.4) to save the datum, read it in real-time and show it on the display, in the memory.
11. Cover the sensor and switch off the instrument at the end of the measurement.

MAINTENANCE

CAUTION

• Only expert and trained technicians should perform maintenance operations. Before carrying out maintenance operations, disconnect all cables from the input terminals.
• Do not use the instrument in environments with high humidity levels or high temperatures. Do not expose to direct sunlight.
• Always switch off the instrument after use. In case the instrument is not to be used for a long time, remove the battery to avoid liquid leaks that could damage the instrument’s internal circuits.

BATTERY REPLACEMENT

When the display shows the “ ” symbol, replace the battery.

1. Switch off the instrument
2. Remove the temperature probe
3. Remove the battery cover
4. Remove the battery from the battery fastener
5. Set the new battery into the battery fastener, and return it to the battery case
6. Replace the battery cover
7. Use the appropriate battery disposal methods for Your area.

CLEANING THE INSTRUMENT

Use a soft and dry cloth to clean the instrument. Never use wet cloths, solvents, water, etc. The white plastic lens of the sensor may be cleaned, if necessary, with a wet cloth.

END OF LIFE

CAUTION: the symbol on the instrument indicates that the appliance, the battery, and its accessories must be collected separately and correctly disposed of.

TECHNICAL SPECIFICATIONS

TECHNICAL CHARACTERISTICS

Accuracy is referred to the following reference conditions: temperature 25°C (77°F) with relative humidity < 70%RH
The instrument is calibrated for a standard white light source consisting of an incandescent lamp, at a temperature/color of 2856°K in compliance with Class A.
Calibration for LED sources (with spectrum response different from that of standard white light) is based on the calibration for standard white light sources in Class A using the appropriate correction factors (see Table 1)
Illuminance measurement (Auto range)

NOTE 1: 1Fc=10.76Lux, 1Klux=1000Lux, 1Kfc=1000Fc
NOTE 2: for temperature/colors different from the reference one, accuracy becomes 6%reading
Distance range for luminous intensity measurement: 0.01 ÷ 30.47m / 0.01 ÷ 99.99ft

Spectrum response
The spectrum response of the photodiode with filter is almost identical to the CIE photo-optical curve V(λ) as shown in the following graph. Sensor
The sensor is a silicon photodiode with a filter on the spectrum response.
General characteristics

ENVIRONMENT

Environmental conditions for use

This instrument satisfies the requirements of EMC Directive 2014/30/EU
This instrument satisfies the requirements of European Directive 2011/65/EU (RoHS) and 2012/19/EU (WEEE)

ACCESSORIES

Accessories provided

• Carrying bag
• Battery (not inserted)
• User manual

SERVICE

WARRANTY CONDITIONS

This instrument is warranted against any material or manufacturing defect, in compliance with the general sales conditions. During the warranty period, defective parts may be
replaced. However, the manufacturer reserves the right to repair or replace the product.
Should the instrument be returned to the After-sales Service or to a Dealer, transport will be at the Customer’s charge. However, shipment will be agreed in advance. A report will always be enclosed in a shipment, stating the reasons for the product’s return. Only use the original packaging for shipment; any damage due to the use of non-original packaging material will be charged to the Customer. The manufacturer declines any responsibility for injury to people or damage to property.
The warranty shall not apply in the following cases:

• Repair and/or replacement of accessories and batteries (not covered by warranty).
• Repairs that may become necessary as a consequence of incorrect use of the instrument or due to its use together with non-compatible appliances.
• Repairs that may become necessary as a consequence of improper packaging.
• Repairs may become necessary as a consequence of interventions performed by unauthorized personnel.
• Modifications to the instrument were performed without the manufacturer’s explicit authorization.
• Use not provided for in the instrument’s specifications or in the instruction manual.

The content of this manual cannot be reproduced in any form without the manufacturer’s authorization.
Our products are patented and our trademarks are registered. The manufacturer reserves the right to make changes in the specifications and prices if this is due to improvements in technology.

8.2. SERVICE
If the instrument does not operate properly, before contacting the After-sales Service, please check the conditions of the battery and replace it, if necessary. Should the instrument still operate improperly, check that the product is operated according to the instructions given in this manual. Should the instrument be returned to the After-sales Service or to a Dealer, transport will be at the Customer’s charge. However, shipment will be agreed in advance. A report will always be enclosed to a shipment, stating the reasons for the product’s return. Only use the original packaging for shipment; any damage due to the use of non-original packaging material will be charged to the Customer.