ENGLISH
User manual
© Copyright HT ITALIA 2011 Release EN 1.04 - 11/05/2011
HT307
CONTENTS:
1. SAFETY PRECAUTIONS AND PROCEDURES ............................................................. 2
1.1. Preliminary ............................................................................................................ 2
1.2. During use ............................................................................................................. 2
1.3. After use ................................................................................................................ 2
2. GENERAL DESCRIPTION .............................................................................................. 3
2.1. Features ................................................................................................................ 3
2.2. Instrument description ........................................................................................... 4
3. PREPARATION FOR USE .............................................................................................. 5
3.1. Initial ...................................................................................................................... 5
3.2. Power supply ......................................................................................................... 5
3.3. Calibration ............................................................................................................. 5
3.4. Storage .................................................................................................................. 5
4. OPERATING INSTRUCTIONS ........................................................................................ 6
4.1. Measurement description ...................................................................................... 6
5. PREVENTIVE MAINTENANCE ....................................................................................... 6
5.1. General information ............................................................................................... 6
5.2. Battery replacement .............................................................................................. 6
5.3. Cleaning ................................................................................................................ 6
5.4. End of life .............................................................................................................. 6
6. TECHNICAL SPECIFICATIONS ..................................................................................... 7
6.1. Characteristics ....................................................................................................... 7
6.1.1. Spectral sensitivity ......................................................................................................... 7
6.1.2. Photo detector ............................................................................................................... 7
6.1.3. General data .................................................................................................................. 8
6.2. Environment .......................................................................................................... 8
6.2.1. Environmental conditions .............................................................................................. 8
6.3. Accessories ........................................................................................................... 8
6.3.1. Standard accessories .................................................................................................... 8
7. SERVICE ......................................................................................................................... 9
7.1. Warranty conditions ............................................................................................... 9
7.2. Service .................................................................................................................. 9
8. APPENDIX A: RECOMMENDED ILLUMINATION ........................................................ 10
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HT307
1. SAFETY PRECAUTIONS AND PROCEDURES
For your own safety and to avoid damaging the instrument follow the procedures
described in this instruction manual and read carefully all notes preceded by this symbol
.
Do not use the meter in presence of explosive gas (material), combustible gas (material),
steam or dust.
The followings symbols are used:
Caution: refer to the instruction manual. An incorrect use may damage the
luxmeter or its components.
1.1. PRELIMINARY
• Before turning on the instrument make sure that the battery is correctly installed.
Replace the battery as soon as the low battery indication (“ ”) is displayed.
• Don’t touch the photodiode sensor during measurements to prevent any damage due
to contamination or static electricity.
1.2. DURING USE
Always keep to the instructions contained in this manual.
An improper use may damage the instrument and/or its components or
injure the operator.
• If the reading value or the sign indication remains unchanged during the
measurement, check if the DATA HOLD function is active.
1.3. AFTER USE
CAUTION
• After using the instrument turn it off.
• If you expect not to use the instrument for a long period remove the battery to avoid
leakages of battery liquids which may damage its inner components.
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2. GENERAL DESCRIPTION
HT307 is a precision digital illuminance meter for light measurements (lux, ft), complying
with the CIE (International Commission on Illumination) spectral response.
It’s fully cosine corrected for the angular incidence of light. Compact, tough and easy to
handle.
The photo detector is a very stable long-life silicon photodiode with spectral response filter.
2.1. FEATURES
• Light measuring levels up to 200.000 lux / 20.000 fc.
• High accuracy and rapid response.
• DATA HOLD function to hold measuring values.
• Unit and sign display for easy reading.
• Manual zeroing with trimmer.
• Corrected for spectral relative efficiency.
• Possibility to select the measuring mode in lux or fc scale, alternatively.
• Maximum and minimum values.
• DC analogic output for connection to external datalogger.
• Low battery indication.
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HT307
2.2. INSTRUMENT DESCRIPTION
LEGEND:
1. LCD display with a maximum reading of 2000
points. Signs of measured values, unit
function symbols and decimal points are
displayed.
2. Power key: press it to turn ON or OFF the
meter.
HT307
Lux/fc light meter
3.
7
4.
key: press it to select the maximum,
M/H
minimum or current reading. Press for more
than 1 second to resume normal
measurement.
Lx/Fc
key: press it to express values in fc scale
instead of lux (1 fc=10.76 lux).
5.
key: press it to hold displayed data. Press
D-H
again to resume normal measurement.
6. R selection key: press it to select 20 lux, 200
lux, 2000 lux, 20 Klux, 200 klux, / 20 fc, 200 fc,
2000 fc, 20 Kfc. Overall, 5 ranges for lux and 4
ranges for fc. Upon pressure, a mobile cursor
selects the desired full scale.
7. Output for analogic DC. Refer to Table 1
below to get the equivalence Lux/fc and mV
values.
8. ADJ Trimmer for manual zeroing regulation.
9. Photo detector.
Fig. 1: Instrument description.
Range
DC output
20 Lux/fc 1 Lux/fc = 10 mV
200 Lux/fc 1 Lux/fc = 1 mV
2000 Lux/fc 1 Lux/fc = 0.1 mV
Plug for DC analogic output
20 kLux/fc 1 Lux/fc = 0.01 mV
200 kLux 1 Lux = 0.001 mV
Table 1: signal equivalence values between Lux/fc and mV.
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HT307
3. PREPARATION FOR USE
3.1. INITIAL
This instrument was checked both mechanically and electrically prior to shipment. All
possible cares and precautions were taken to let you receive the instrument in perfect
conditions. Notwithstanding we suggest you to check it rapidly (eventual damages may
have occurred during transport – if so please contact the local distributor from whom you
bought the item).
Make sure that all standard accessories mentioned in paragraph 6.3.1 are included.
Should you have to return back the instrument for any reason please follow the
instructions mentioned in paragraph 7.
3.2. POWER SUPPLY
The instrument is powered by 1 battery 9V 6LR61, included in the package. Battery life:
about 200 hours (carbon zinc.).
When the battery is low, the symbol "
following the instructions given in paragraph 5.2.
3.3. CALIBRATION
The instrument complies with the technical specifications contained in this manual and
such compliance is guaranteed for 1 year.
The calibration interval for the photo detector varies according to the operating conditions,
but generally the sensitivity decreases in direct proportion to the product of luminous
intensity and operating time. In order to maintain the basic accuracy of the instrument, a
periodic recalibration is recommended.
3.4. STORAGE
After a period of storage in extreme environmental conditions exceeding the limits
mentioned in paragraph 6.2.1 let the instrument resume normal measuring conditions
before using it.
" appears on the display. Replace it immediately,
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HT307
4. OPERATING INSTRUCTIONS
4.1. MEASUREMENT DESCRIPTION
1. Press the power key “☉ ” to turn on the meter.
2. Press the “Lx/fc” key to select lux or fc measurement.
3. Remove the protection cap of the photo detector and expose it to the light source in
horizontal position. Read the illuminance nominal value on the LCD display.
4. Wait for values to be stable on the display. Press “D-H” key to activate the DATA
HOLD function blocking the result on the display.
CAUTION
If the instrument displays "OL", the input signal is too strong. A higher range
must be selected.
5. When the measurement is completed, fit the photo detector cap and check that the
indication value should be “000” regardless of the range. If no, adjust the “ADJ” trimmer
on “000” before pressing the power key to turn off the meter.
5. PREVENTIVE MAINTENANCE
5.1. GENERAL INFORMATION
This is a precision instrument. To guarantee its performances be sure to use it according to
these instructions and keep it stored on suitable environmental conditions Do not expose it to
high temperatures or humidity. Be sure to turn it off after use. If you expect not to use the
instrument for a long period remove batteries to avoid leakages of battery liquid which
could damage the its inner components.
5.2. BATTERY REPLACEMENT
When the low battery indication “ ” is displayed, replace the battery.
1. Switch off the instrument
2. Press the battery cover and push in the direction of the arrow to open
3. Replace the battery with a new one of the same type (9V 6LR61)
4. Replace the battery cover
5. Use an environmentally safe disposal unit at a municipal waste disposal centre to
dispose of a damaged or worn out batteries
5.3. CLEANING
To clean the instrument use a soft dry cloth. Never use a wet cloth, solvents or water, etc.
The white plastic lens of the detector should be cleaned with a damp cloth when
necessary.
5.4. END OF LIFE
Caution: this symbol indicates that equipment, the battery and its accessories
shall be subject to a separate collection and correct disposal.
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HT307
y
(
)
6. TECHNICAL SPECIFICATIONS
6.1. CHARACTERISTICS
Accuracy is referred to the following reference conditions: 23°C ± 5°C with RH < 70%.
The luxmeter is calibrated with a standard incandescent lamp at color temperature
2856°K.
Measuring range and accuracy
Range in lux
Resolution
Accuracy
Range in fc
Resolution
Accuracy
NOTE: 1fc=10.76Lux, 1Klux=1000Lux, 1Kfc=1000fc
for temperature/color different from the reference, accuracy is 6% rdg
Accuracy on angular deviation from cosine characteristic
30° ± 2%
60° ± 6%
80° ± 25%
6.1.1. Spectral sensitivity
The photodiode with filters makes the spectral sensitivity meet the CIE photo-optic curve
V(λ) as shown below.
20 200 2000 20k 200k
0.01 0.1 1 10 100
± (3% rdg)
20 200 2000 20k
0.01 0.1 1 10
± (3% rdg)
100
90
80
%
70
60
50
40
30
20
10
0
Relative sensitivit
380 440 500 560 620 680 740
V(λ)
HT307
Wavelength (nm)
Fig. 2: CIE photo-optic curve V(λ).
6.1.2. Photo detector
The photo detector is a silicon photodiode with spectral response filter.
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6.1.3. General data
Mechanical characteristics
Size: 172(L) x 55(W) x 38(H)mm
7(L) x 2(W) x 1(H) inches
Weight (including battery): about 250g (9 ounces)
Supply
Battery type: 1 battery 9V type 6LR61
Low battery indication: " " is displayed when the battery is low
Battery life: about 200 hours (carbon zinc.)
Display
Characteristics: LCD, 2000 counts with “OL” indication
Sample rate: 2.5 times/sec
Reference standards
Standards: According to JIS C 1609:1993 and CNS 5119 general A
class Specifications
ISO3059 DIN 5032
6.2. ENVIRONMENT
6.2.1. Environmental conditions
Reference temperature: 23° ± 5°C (73° ± 41°F)
Operating temperature: -10° ÷ 50°C (14° ÷ 122°F)
Operating humidity: <80%RH
Storage temperature: -10° ÷ 50°C (14° ÷ 122°F)
Storage humidity: <70%RH
Max height of use: 2000m (6562 ft)
This instrument complies with the requirements of the EMC Directive 2004/108/CE
6.3. ACCESSORIES
6.3.1. Standard accessories
The packaging contains:
• Instrument HT307
• Carrying case
• Connection plug for DC analogic output
• Screwdriver for zero adjustment
• Certificate of test
• Battery
• User manual
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7. SERVICE
7.1. WARRANTY CONDITIONS
This instrument is guaranteed against material or production defects, in accordance with
our general sales conditions. During the warranty period the manufacturer reserves the
right to decide either to repair or replace the product.
Should you need for any reason to return back the instrument for repair or replacement
take prior agreements with the local distributor from whom you bought it. Do not forget to
enclose a report describing the reasons for returning (detected fault). Use only original
packaging. Any damage occurred in transit due to non original packaging will be charged
anyhow to the customer.
The manufacturer will not be responsible for any damage to persons or things.
The warranty doesn’t apply to:
• Accessories and batteries (not covered by warranty).
• Repairs made necessary by improper use (including adaptation to particular
applications not foreseen in the instructions manual) or improper combination with
incompatible accessories or equipment.
• Repairs made necessary by improper shipping material causing damages in transit.
• Repairs made necessary by previous attempts for repair carried out by non skilled or
unauthorized personnel.
• Instruments for whatever reason modified by the customer himself without explicit
authorization of our Technical Dept.
The contents of this manual may not be reproduced in any form whatsoever without the
manufacturer’s authorization.
Our products are patented and our logotypes registered. We reserve the right to
modify specifications and prices in view of technological improvements or
developments which might be necessary.
7.2. SERVICE
Shouldn’t the instrument work properly, before contacting your distributor make sure that
the battery is correctly installed and working, check the test leads and replace them if
necessary. Make sure that your operating procedure corresponds to the one described in
this manual.
Should you need for any reason to return back the instrument for repair or replacement
take prior agreements with the local distributor from whom you bought it. Do not forget to
enclose a report describing the reasons for returning (detected fault). Use only original
packaging. Any damage occurred in transit due to non original packaging will be charged
anyhow to the customer.
The manufacturer will not be responsible for any damage to persons or things.
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HT307
8. APPENDIX A: RECOMMENDED ILLUMINATION
Table 2 below shows the recommended illumination for different types of locations
expressed in lux (to get values in footcandles divide by 10,76).
LOCATIONS LOCATIONS
OFFICE
•
Conference, reception room 200
Clerical work 700
Typing, drafting 1000
LUX LUX
STORE
•
750 Indoor stairs corridor 150
~
1500 Show window, packing table 750
~
2000 Forefront of show window 1500
~
~
~
~
200
1500
3000
FACTORY
•
Visual work at production line 300
Inspection work 750
Electronic parts assembly line 1500
Packing work, entrance passage 150
HOTEL
•
Public room, cloakroom 100
Reception 200
Cashier 750
Table 2: Recommended illumination values.
HOSPITAL
•
750 Sickroom, warehouse 100
~
1500 Medical examination room 300
~
3000 Operating room 750
~
300 Emergency treatment 750
~
SCHOOL
•
200 Auditorium, indoor gymnasium 100
~
500 Class room 200
~
1000 Laboratory, library, drafting room 500
~
200
~
750
~
1500
~
1500
~
300
~
750
~
1500
~
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