ENGLISH
User manual
© Copyright HT ITALIA 2011 Release EN 1.01 - 23/12/2011
HT154
Table of contents:
1. SAFETY PRECAUTIONS AND PROCEDURES ............................................................. 2
1.1. Preliminary ................................................................................................................ 2
1.2. During Use ................................................................................................................ 2
1.3. After Use ................................................................................................................... 3
2. GENERAL DESCRIPTION .............................................................................................. 3
3. PREPARATION FOR USE .............................................................................................. 4
3.1. Initial .......................................................................................................................... 4
3.2. Supply Voltage .......................................................................................................... 4
3.3. Calibration ................................................................................................................. 4
3.4. Storage ..................................................................................................................... 4
4. OPERATING INSTRUCTIONS ........................................................................................ 5
4.1. Instrument Description .............................................................................................. 5
4.1.1. Commands description .................................................................................................. 5
4.1.2. Display symbols description .......................................................................................... 5
4.2. Function key description ........................................................................................... 6
4.2.1. ON/OFF key .................................................................................................................. 6
4.2.2. A/C function key ............................................................................................................ 6
4.2.3. LEVEL key ..................................................................................................................... 6
4.2.4. FAST/SLOW key ........................................................................................................... 6
4.2.5. MAX/MIN key ................................................................................................................ 6
4.3. Measurements .......................................................................................................... 7
4.3.1. Connection to analogical AC and DC output ................................................................. 7
4.3.2. Calibration procedure .................................................................................................... 8
5. MAINTENANCE .............................................................................................................. 9
5.1. General information ................................................................................................... 9
5.2. Battery replacement .................................................................................................. 9
5.3. Cleaning .................................................................................................................... 9
5.4. End of life .................................................................................................................. 9
6. TECHNICAL SPECIFICATIONS ................................................................................... 10
6.1. Technical Characteristics ........................................................................................ 10
6.2. General Characteristics ........................................................................................... 10
6.3. Environmental conditions ........................................................................................ 11
6.3.1. Climatic conditions ...................................................................................................... 11
6.3.2. EMC ............................................................................................................................ 11
6.4. Accessories ............................................................................................................. 11
6.4.1. Standard accessories .................................................................................................. 11
7. SERVICE ....................................................................................................................... 12
7.1. Warranty Conditions ................................................................................................ 12
7.2. Service .................................................................................................................... 12
EN - 1
HT154
1. SAFETY PRECAUTIONS AND PROCEDURES
This apparatus conforms to safety standard EN 61010-1, relating to electronic measuring
instruments. For your own safety and that of the apparatus, you must follow the
procedures described in this instruction manual and especially read all the notes preceded
by the symbol carefully.
Take extreme care for the following conditions when measuring:
• Do not perform measurement under humid or wet environment.
• Do not operate the meter under the environment with explosive gas (material),
combustible gas (material), steam or filled with dust.
• If any unusual condition of testing end (metal part) and attachment of the meter such as
breakage, deformation, fracture, foreign substance, no display, etc., do not conduct any
measuring.
The herewith symbols are used:
CAUTION - refer to the instruction manual - an improper use may damage the
instrument or its components.
Meter double insulated.
Meter compliance to CE mark standards.
1.1. PRELIMINARY
• This instrument can be used for sound level measurement from 30dB up to 130dB and
frequency enclosed in 31.5 ÷ 8kHz range.
• You must comply with the usual safety regulations aimed at protecting the instrument
against an incorrect operation.
• Calibrate the instrument before operation if the instrument was not in use for a long
time or operated at bad environment (see chapter 4.3.2)
• Check if the battery is installed correctly.
1.2. DURING USE
Read the recommendation which follow and the instruction in this manual:
CAUTION
Non compliance with the warnings and/or the instructions for use may
damage the apparatus and/or its components or injure the operator.
• Do not operate the instrument at temperature and humidity environment external to
reference conditions of chapter 6.3.1.
• Wind blowing across the microphone would bring additional extraneous noise. Once
using the instrument in the presence of wind, it is a must to mount the windscreen to
not pick up undesirable signals.
• Keep the microphone dry and avoid severe vibration.
• During measuring, if the value of reading remains unchanged, check if the MAX/MIN
function is active.
EN - 2
HT154
1.3. AFTER USE
• Once the measurements are completed, switch OFF the meter.
• If the instruments is not be used for a long period, remove the battery.
2. GENERAL DESCRIPTION
The meter can perform the herewith functions:
¾ Sound Pressure Level (SPL) measurements with 30dB to 130dB range.
¾ A or C frequency weighted measurements.
¾ FAST or SLOW integrations measurements.
¾ MAX and MIN value of SPL.
¾ AC or DC analogical outputs used with multimeters or external data loggers.
¾ Manual range selection.
On frontal panel of meter there are four function keys for selection of above specifications
(see chapter 4.2). Measurement value is shown on the wide LCD display with relative
measures unit and symbols of selected functions.
On side panel there are the terminals for AC and DC analogical outputs with 3.5mm coax
plug and the input for external 9VDC adapter for use of meter without internal battery.
On back panel there is the screw for mounting external tripod during performing measures.
EN - 3
HT154
3. PREPARATION FOR USE
3.1. INITIAL
All the equipment has been checked mechanically and electrically prior to shipment.
Every care has been taken to ensure that the instrument reaches you undamaged.
However, it is wise to carry out a rapid check in order to detect any possible damage that
might have been caused during transport. Should this be the case, immediately enter the
usual claims with courier.
Check the packaging contained according to packaging list reported in chapter 6.4.1 In
case of discrepancies contact the dealer.
In the event of re-shipment of the equipment please follow the instructions reported in
chapter 7.
3.2. SUPPLY VOLTAGE
The instrument is battery supplied; it use a single battery model 9V NEDA 1604 IEC 6F22
JIS 006P included in packaging. The battery autonomy is about 30 hours.
The symbol " " appears when the battery is nearly discharged. In case replace it
following the instructions in chapter 5.2.
Meter can be supplied also with external 9VDC adapter (see chapter for electrical
specifications) with the herewith plug type:
3.3. CALIBRATION
The instrument fulfils the technical characteristics listed in this manual. The performance of
the specifications is guaranteed for one year.
3.4. STORAGE
In order to guarantee the accuracy of the measurements, after a period of storage in
extreme environment condition, wait for the time necessary so that the apparatus returns
to normal measuring conditions (see chapter 6.3.1).
Positi ve
External Diameter 5.5mm
Int ernal Diameter 2.1mm
Negative
EN - 4
HT154
4. OPERATING INSTRUCTIONS
4.1. INSTRUMENT DESCRIPTION
4.1.1. Commands description
8
1
HT154
Sound Level Met er
3
2
9
4
5
10
13
9V BATTERY
NEDA 1604 6F22 006P
PLEASE READ MANUAL
FOR SAFETY
6
11
7
12
14
OPEN
LEGEND:
1. Windscreen
2. Display
3. Frequency A/C Weighing
selector key
4. ON/OFF key
5. Level Range control key
6. MAX MIN key.
7. FAST/SLOW integration
selector key
8. Microphone
9. CAL adjust trimmer
10. AC output terminal
11. DC output Terminal
12. External DC 9V power
supply terminal
13. Tripod mounting screw
14. Battery cover
Fig. 1: Instrument description
4.1.2. Display symbols description
3
2
1
FAST SLOW MIN MAX
11
10
9
LEGEND:
1. FAST integration
2. SLOW integration
3. Minimum value indication
4
5
4. Maximum value
indication
5. Low battery indication
6. A Weighting curve
6
7. C Weighting curve
8. Over range indication
7
9. Range indication
10. Under range indication
11. Sound level readout
8
Fig. 2: Display description
EN - 5
HT154
4.2. FUNCTION KEY DESCRIPTION
4.2.1. ON/OFF key
Pressing of key permits to turn ON or switch OFF the meter in any moment.
4.2.2. A/C function key
Using the A/C key it is possible to select the A or C frequency weighting:
¾ A weighting: Normally it is used for general sound level measurements.
¾ C weighting: Used for checking the low-frequency content of noise.
4.2.3. LEVEL key
Cyclically pressing of LEVEL key permits to select the desired range choosing the
herewith values:
¾ 30 ÷ 80dB
¾ 50 ÷ 100dB
¾ 80 ÷ 130dB
The selected range is indicated in the bottom area of LCD.
4.2.4. FAST/SLOW key
Press the FAST/SLOW key to select the corresponding time integrations. In particular:
¾ FAST: Used for Normal Measurements.
¾ SLOW: Used for checking the average level of fluctuating noise.
4.2.5. MAX/MIN key
This function allows the instrument to storing the MIN and MAX values of the Sound
Pressure Level. Select the proper range as described in chapter 4.2.2 before using the
MAX/MIN function.
Pressing MAX/MIN key the symbol "MAX" is shown in the top of display. In this mode the
instrument measures and shows the maximum value of the sound Pressure Level. This
value will be automatically updated if a bigger value will occur.
Pressing again the MAX/MIN the symbol "MIN" is shown in the top of display. In this mode
the instrument measures and shows the minimum value of the Sound Pressure Level. This
value will be automatically updated if a lower value will occur.
Pressing MAX/MIN key for at least 1 second to escape this mode and back to normal
measurements.
EN - 6
HT154
4.3. MEASUREMENTS
CAUTION
Wind blowing across the microphone would bring additional extraneous
noise. Once using the instrument in the presence of wind with speed higher
than 10m/s, it is a must to mount the windscreen to not pick up undesirable
signals. Keep the microphone dry and avoid sever vibration.
1. Turn ON the meter.
2. Performing calibration operation if the meter was not used for a long time using the
standard portable calibrator (see chapter 4.3.2).
3. Pressing A/C key to select the desired frequency weighing (see chapter 4.2.2)
4. Pressing FAST/SLOW key to select the corresponding time integration (see chapter
4.2.4).
5. Pressing LEVEL key to select the desired SPL range (see chapter 4.2.3).
6. Reading at display the measured SPL value.
7. If the message OVER or UNDER are shown on the display, use LEVEL key to select a
higher or lower range respectively.
8. Pressing the MAX/MIN key to shows the Maximum or Minimum SPL value at display
(see chapter 4.2.5).
4.3.1. Connection to analogical AC and DC output
HT154 meter can be connected to accuracy multimeters and/or external data logger for
recording scope using the analogical DC or AC output (see Fig. 1) using 3.5mm coax plug
supplied as standard accessory. Technical specifications of output analogical are shown in
the herewith figure:
AC Output
DC Output
Signal
1Vrms at selected FS
¾
Output impedance: about
¾
50Ω
Output: 10mV/dB
¾
Output impedance: about
¾
100Ω
Ground
3.5mm output plug
Fig. 3: Description of analogical outputs
EN - 7
HT154
4.3.2. Calibration procedure
Portable calibrator
HT154
Sound L evel Meter
Screwdriv er
Fig. 4: Connection of meter to portable calibrator HT150
1. Turn ON the meter.
2. Setting herewith configuration:
Frequency Weighting: A (dBA)
Integration time: FAST
3. Inserting with care the portable calibrator HT150 on meter microphone up to listen a
click, as shown in Fig.4.
4. Pressing LEVEL key and selecting “50-100” range at display.
5. Turn ON calibrator and select 94dB level at 1kHz sinusoidal frequency. Red LED on
calibrator must be ON.
6. Insert the screwdriver inside “CAL” trimmer and adjust the measured value up to read
“94.0” at display.
7. Extract from microphone and switch OFF calibrator.
EN - 8
HT154
5. MAINTENANCE
5.1. GENERAL INFORMATION
This digital meter is a precision instrument. Whether in use or in storage, please do not
exceed the specification requirements to avoid any possible damage or danger during use.
Do not place this meter in high temperature or humidity or expose to direct sunlight.
Be sure to turn the meter off after use. For long time storage, remove the battery to avoid
leakage of battery liquid that would damage the interior parts.
5.2. BATTERY REPLACEMENT
When LCD displays the symbol " " replace battery.
1. Switch OFF the meter.
2. Remove the battery cover.
3. Remove the battery from the battery fastener carefully.
4. Set the new battery of the same type (9V battery, 006P or IEC6F22 or NEDA 1604) into
battery fastener and return it to the battery case.
5. Replace the battery cover.
6. Do not scatter old batteries in the environment. Use the appropriate containers for
disposal.
5.3. CLEANING
For cleaning the instrument use a soft dry cloth. Never use a wet cloth, solvents or water,
etc.
5.4. END OF LIFE
Caution: this symbol indicates that equipment and its accessories shall be
subject to a separate collection and correct disposal
EN - 9
HT154
6. TECHNICAL SPECIFICATIONS
6.1. TECHNICAL CHARACTERISTICS
Accuracy is referred to the herewith conditions: 23°C ± 5°C with <80% RH.
• Sound Pressure Level (SPL)
Range Dynamic range Resolution Accuracy Frequency range
Lo
Med
Hi
• Time weighting
• Analogical Output
• Microphone
½ inch Electret condenser microphone
• Safety
Comply with: IEC 61672 Type 2
For inside use, max height: 2000m; 6561ft
6.2. GENERAL CHARACTERISTICS
Mechanical characteristics
Size: 280(L) x 80(W) x 32(H)mm; 11.02 x 3.15 x 1.26 in
Weight (including battery): about 300g; 9.65 ounces
Supply
Battery type: 1 battery x 9V NEDA 1604, IEC 6F22, JIS 006P battery.
Low battery indication: Symbol " " is displayed when battery level is too low.
Battery life: About 30 hours.
External adapter: 9VDC output voltage (8 ÷13VDC max)
output current :>30mADC
Display
Characteristics: 3 ½ digit
Display Update: 0.5s
30 ÷80dB
50 ÷100dB
50dB 0.1dB
±1.5dB 31.5Hz ÷8kHz
80 ÷130dB
Function Integration time
FAST 125ms
SLOW 1sec
Output Voltage output Output impedance
AC Output 1Vrms at Full Scale of the selected range
DC Output 10mV/dB
50Ω
100Ω
EN - 10
HT154
6.3. ENVIRONMENTAL CONDITIONS
6.3.1. Climatic conditions
Reference temperature: 23° ± 5°C; 73° ± 41°F
Operating temperature: 5 ÷ 40 °C; 41 ÷ 104 °F
Operating humidity: <80% RH
Storage temperature: -10 ÷ 60 °C; 14 ÷ 140 °F
Storage humidity: <70% RH
6.3.2. EMC
This instrument complies with the requirements of European Directive EMC
2004/108/EC
6.4. ACCESSORIES
6.4.1. Standard accessories
The accessories contained inside the packaging are the following:
• Instrument HT154
• Portable calibrator HT150
• Wind Screen
• Screwdriver
• Plug for analogical DC/AC output
• Carrying case
• Battery
• Instruction manuals
EN - 11
HT154
7. SERVICE
7.1. WARRANTY CONDITIONS
This instrument is guaranteed for one year 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 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
batteries are correctly installed and working, check the test leads and replace them if
necessary.
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.
EN - 12
Loading...