ENGLISH
User manual
Copyright HT ITALIA 2012 Release EN 1.01 - 06/02/2012
HT309
TABLE OF CONTENTS:
1. PRECAUTIONS AND SAFETY MEASURES .................................................................. 2
1.1. Preliminary instructions ......................................................................................... 2
1.2. During use ............................................................................................................. 2
1.3. After use ................................................................................................................ 2
2. GENERAL DESCRIPTION .............................................................................................. 3
3. PREPARATION FOR USE .............................................................................................. 3
3.1. Initial checks .......................................................................................................... 3
3.2. Instrument power supply ....................................................................................... 3
3.3. Calibration ............................................................................................................. 3
3.4. Storage .................................................................................................................. 3
4. OPERATING INSTRUCTIONS ........................................................................................ 4
4.1. Instrument description ........................................................................................... 4
4.2. Description of function keys ................................................................................... 5
4.2.1. HOLD/L.S. (Light Source) key ....................................................................................... 5
4.2.2. LX/FC/CD key ............................................................................................................... 5
4.2.3. MEM/READ key ............................................................................................................ 6
4.2.4. Deleting the internal memory ........................................................................................ 6
4.2.5. MAX/MIN/AVG functions ............................................................................................... 6
4.2.6. Disabling the Auto Power OFF function ........................................................................ 6
4.2.7. ZERO key ...................................................................................................................... 6
4.3. Measuring operations ............................................................................................ 7
4.3.1. Illuminance measurement ............................................................................................. 7
4.3.2. Luminous intensity measurement .................................................................................. 7
5. MAINTENANCE .............................................................................................................. 8
5.1. Battery replacement .............................................................................................. 8
5.2. Cleaning the instrument ......................................................................................... 8
5.3. End of life .............................................................................................................. 8
6. TECHNICAL SPECIFICATIONS ..................................................................................... 9
6.1. Technical characteristics ....................................................................................... 9
6.1.1. Spectrum response ....................................................................................................... 9
6.1.2. Sensor ........................................................................................................................... 9
6.1.3. General characteristics ................................................................................................ 10
6.2. Environment ........................................................................................................ 10
6.2.1. Environmental conditions for use ................................................................................ 10
6.3. Accessories ......................................................................................................... 10
6.3.1. Accessories provided .................................................................................................. 10
7. SERVICE ....................................................................................................................... 11
7.1. Warranty conditions ............................................................................................. 11
7.2. Service ................................................................................................................ 11
8. APPENDIX A: RECOMMENDED ILLUMINANCE LEVELS ........................................... 12
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HT309
1. 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 measurement 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.
1.1. PRELIMINARY INSTRUCTIONS
• In order to prevent incorrect reading, replace the battery when the symbol “ ”
appears on the display when switching on the instrument.
1.2. 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 remain
unchanged, check if the HOLD function is enabled.
1.3. AFTER USE
• When measurement is complete, switch off the instrument.
• If the instrument is not to be used for a long time, remove the battery.
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HT309
2. GENERAL DESCRIPTION
The instrument HT309 is a precision digital luxmeter, mainly used for measuring
illuminance of both white light sources and LED sources of various colours, 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
• Setting of correction factors of spectrum response
• Internal memory for saving measurement results
• Auto Power OFF
• Autorange
3. PREPARATION FOR USE
3.1. 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 §
6.3. In case of discrepancy, please contact the Dealer. In case the instrument should be
returned, please follow the instructions given in § 7
3.2. 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 in the instrument. For battery installation, follow the instructions given in § 5.1.
The “ ” symbol appears when the battery is flat. Replace the battery by following the
instructions given in § 5.1.
3.3. CALIBRATION
The instrument has the technical specifications described in this manual. The instrument’s
performance is guaranteed for 12 months.
3.4. 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
the environmental specifications contained in § 6.2.1 before use).
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HT309
4. OPERATING INSTRUCTIONS
4.1. INSTRUMENT DESCRIPTION
CAPTION:
1. LCD display
2.
LX/FC/CD
3.
MEM/READ
4. S arrow key
5. (ON/OFF) / (Auto
Power OFF) key
6.
ZERO
7.
HOLD/L.S.
8. T arrow key
9. Photodiode sensor
key
key
key
key
Fig. 1: Instrument description
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HT309
4.2. DESCRIPTION OF FUNCTION KEYS
Some of the function keys on the front panel have a double function, which can be
activated by pressing and holding the key for more than 1 second.
4.2.1. HOLD/L.S. (Light Source) key
¾ Press the HOLD/L.S key to freeze the value of the measured quantity on the display.
The symbol “HOLD” appears on the display. Press the HOLD/L.S. key again to exit the
function.
¾ Press and hold the HOLD/L.S. key for more than 1 second 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 S or T to select the desired source among the available options
L0 ÷ L9 (see Table 1)
3. Press the HOLD/L.S. 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 S or T 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.
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
Table 1: List of available sources
4. Press and hold the HOLD/L.S. key for more than 1 second to confirm the operation.
The symbols stop flashing on the display.
4.2.2. LX/FC/CD key
¾ 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).
¾ Press and hold the LX/FC/CD key for more than 1 second to select the measuring unit
of luminous intensity (see § 4.3.2).
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HT309
4.2.3. MEM/READ key
¾ 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”
appear at the bottom of the display on the left. The control is not active when the HOLD
function is activated. With activated “AVG” function, pressing the MEM/READ key
saves the average (AVG) value of the datum on the display in the memory.
¾ Pressing and holding the MEM/READ key for more than 1 second allows recalling the
data saved in the internal memory on the display. The symbols “MEM” and “R” together
with the number of the last memory location used are shown on the display. Use the
arrow keys T or S to select memory locations. The display shows the corresponding
saved value. Press the MEM/READ key to exit the function.
4.2.4. 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 messages “MEM” and “CLr” are shown on the display for a few seconds and
the number of the memory location is taken back to “01”.
4.2.5. MAX/MIN/AVG functions
Press the arrow key S to view the Minimum, Maximum and Average 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 and hold the S key for more than 1 second to exit the function.
4.2.6. 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 and hold the ON/OFF key for more than 1 second. The symbol “
from the display.
• Switch off and then on again the instrument to automatically enable the function.
4.2.7. ZERO 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 ZERO key is pressed with the protection cover not
positioned on the sensor. Insert the cover and repeat the operation, if necessary.
” disappears
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HT309
4.3. MEASURING OPERATIONS
4.3.1. 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 ZERO key (see § 4.2.7).
4. Select the measuring unit Lux or Fc on the instrument by pressing the LX/FC/CD key
(see § 4.2.2).
5. Select the type of source to be tested by pressing and holding the HOLD/L.S. key for
more than 1 second (see § 4.2.1). 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 HOLD/L.S. key, if necessary (see § 4.2.1) to freeze the value shown on the
display.
8. Press the MEM/READ key to save the datum, read in real time and shown on the
display, in the memory.
9. Cover the sensor and switch off the instrument at the end of measurement.
4.3.2. 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 ZERO key (see § 4.2.7).
4. Select the measuring unit on the instrument by pressing and holding the LX/FC/CD key
for more than 1 second. The symbol “CD” is shown on the display.
5. Use the arrow keys S or T to select the measuring unit of distance (m or ft) and
confirm with LX/FC/CD.
6. Set the value of the distance between the measured point and the light source (only of
standard type “L0”) using the arrow keys S or T (press and hold the arrow keys for a
quick setting) and confirm with the LX/FC/CD key.
7. 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.
8. Press the HOLD/L.S. key, if necessary (see § 4.2.1) to freeze the value shown on the
display.
9. Press the MEM/READ key to save the datum, read in real time and shown on the
display, in the memory.
10. Cover the sensor and switch off the instrument at the end of measurement.
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HT309
5. 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.
5.1. BATTERY REPLACEMENT
When the display shows the “ ” symbol, replace the battery.
1. Switch off the instrument using the ON/OFF key.
2. Press the battery compartment cover and slide it in the direction of the arrow.
3. Remove the old battery and replace it with a new battery of the same type (see § 6.1.3)
4. Restore the battery compartment cover to its position.
5. Do not dispose of the batteries together with household waste. According to European
Directives, old batteries must be disposed of separately and recycled.
5.2. 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.
5.3. 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.
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HT309
y
(
)
6. TECHNICAL SPECIFICATIONS
6.1. TECHNICAL CHARACTERISTICS
Accuracy is referred to the following reference conditions: temperature 23°C ± 5°C with
relative humidity < 70%RH.
The instrument is calibrated for a standard white light source consisting of an incandescent
lamp, at a temperature/colour 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 source in Class A using the
appropriate correction factors (see Table 1)
Illuminance measurement (Autorange)
Full scale (Lux) 40 400 4000 40k 400k
Resolution (Lux) 0.01 0.1 1 10 100
Accuracy ± (3%reading)
Full scale (Fc) 40 400 4000 40k
Resolution (Fc) 0.01 0.1 1 10
Accuracy ± (3%reading)
NOTE 1: 1Fc=10.76Lux, 1Klux=1000Lux, 1Kfc=1000Fc
NOTE 2: for temperature/colours different from the reference one, accuracy becomes 6%reading
Distance range for luminous intensity measurement: 0.01 ÷ 30.47m / 0.01 ÷ 99.99ft
Accuracy on angular deviation from cosine characteristic
30° ± 2%
60° ± 6%
80° ± 25%
6.1.1. Spectrum response
The spectrum response of the photodiode with filter is almost identical to the CIE photooptical curve V(λ) as shown in the following graph.
100
90
80
%
70
60
50
40
30
20
10
Relative sensitivit
0
380 440 500 560 620 680 740
Wavelength (nm)
V(λ)
V(?)
HT309
HT307
Fig. 2: CIE curve V(λ).
6.1.2. Sensor
The sensor is a silicon photodiode with filter on the spectrum response.
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HT309
6.1.3. General characteristics
Mechanical characteristics
Size (LxWxH): 130x55x38mm (5x2x1 in)
Sensor size (LxWxH): 80x55x25mm (3x2x1 in)
Cable length: approx 1.5m (39 in)
Weight (battery included): 250g (9 ounces)
Power supply
Battery type: 1x9V battery type NEDA 1604 IEC 6F22
Low battery indication: the display shows symbol “ ”
Battery life: approx. 200 hours
Display
Characteristics: LCD, 6 digits, 4000 dots plus decimal point
Over range indication: the display shows symbol “OL”
Sampling rate: 2.5 measurements/s
Considered standards
Reference standard: JIS C 1609:1993 and CNS 5119 general
specification in Class A
Pollution level: 2
6.2. ENVIRONMENT
6.2.1. Environmental conditions for use
Reference temperature: 23° ± 5°C (73° ± 41°F)
Operating temperature: 5° ÷ 40°C (41° ÷ 104°F)
Allowable relative humidity: < 80%RH
Storage temperature: -10° ÷ 60°C (14° ÷ 140°F)
Storage humidity: < 70%RH
Max operating altitude: 2000m (6562 ft)
This instrument satisfies the requirements of Directives EMC 2004/108/EC
6.3. ACCESSORIES
6.3.1. Accessories provided
• Carrying bag
• Battery (not inserted)
• User manual
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HT309
7. SERVICE
7.1. 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 to a shipment, stating the reasons for the product’s return.
Only use 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 an 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 which may become necessary as a consequence of interventions performed
by unauthorized personnel.
• Modifications to the instrument 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.
7.2. 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 original packaging for shipment; any damage due to the use of non-original
packaging material will be charged to the Customer.
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8. APPENDIX A: RECOMMENDED ILLUMINANCE LEVELS
Reports the recommended illuminance values (expressed in Lux; divide by 10.76 to obtain
the corresponding values in Fc) for the different types of environments:
ENVIRONMENT ENVIRONMENT
•
AT WORK
Conference hall, reception hall 200
Place of worship 700
Office 1000
LUX LUX
•
SHOP
750 Internal stairs, corridor 150
~
1500 Shop window, counter 750
~
2000 Further than the shop window 1500
~
~
~
~
200
1500
3000
•
FACTORY
Production line 300
Product verification 750
Assembly of electronic parts 1500
Goods entry/exit 150
HOTEL
•
Lounge, TV hall, cloakroom 100
Reception hall 200
Cash desk 750
Table 2: Recommended illuminance values
•
HOSPITAL
750 Patients' rooms, store 100
~
1500 Ambulatory clinic 300
~
3000 Operating room 750
~
300 Emergency room 750
~
SCHOOL
•
200 Auditorium, gymnasium 100
~
500 Classroom 200
~
1000 Laboratory, library 500
~
200
~
750
~
1500
~
1500
~
300
~
750
~
1500
~
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