FONESTAR MI-21 Manuale utente
MI-21
IMPEDANCE METER FOR SPEAKERS OR 100 OR 70 V
LINE SPEAKER SYSTEM
INSTRUCTION MANUAL
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DESCRIPTION
Model MI-21 is an impedance meter with a test frequency of 1 kHz. It has the function to calculate the minimun
power needed by an amplifier in order to determine the measured impedance.
Loudspeaker systems can be checked and measurements in 70 and 100 V loudspeaker lines can be made.
With 3 meter scales: 200 Ω, 2 kΩ and 20 kΩ. Easy to read LCD display.
CONTROLS AND FUNCTIONS
FRONT PANEL
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1.- LCD display.
2.- Z-W: button for alternating between the value of the measured impedance (Z) and the estimated power
equivalent (W).
3.- Selector for the desired full scale for the impedance measurement. 2 OFF positions are also
incorporated.
4.- 100 V/70 V: button for changing the impedance calculation parameters depending on whether it is
measured in 70 or 100 V line.
5.- COM: common terminal.
6.- Ω: positive measurement terminal.
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EN
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INSTRUCTIONS FOR USE
To measure the impedance in a loudspeaker or speaker line, the steps below must be followed:
- Connect the measuring cables in the banana plugs, place the red probe in the positive terminal (Ω) and
the black probe in the negative terminal (COM).
- Place the positive and negative terminals from the impedance meter in the connection terminals on the
loudspeaker or the speaker line that you want to measure. The result will appear on the display.
- Switch the MI-21 impedance meter on using the circular switch on the front panel, move it to one of the
3 possible positions: 200 Ω, 2 kΩ or 20 kΩ.
- Check that the Z-W selector is in the Z position to measure impedance.
Note: it is recommended the highest full scale (20 kΩ) be used and, if the measurement is not very
precise, lower the full scale to get a more precise measurement.
- To show the value of the estimated power with the current measurement, press the Z-W button.
Press it again to go back to the impedance measurement. Select 100 V/70 V depending on the type of
speaker line you are going to measure.
BATTERY REPLACEMENT
When a message appears on the display showing low batteries, it is recommendable to replace them. Follow
the steps below:
- Move the selector on the front panel to the OFF position and disconnect the cables used for measuring.
- Unscrew the case on the back panel of the impedance meter and replace the 9 V battery with a new one.
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EN
SPECIFICATIONS THECNICAL
MI-21
CHARACTERISTICS Impedance meter at 1 kHz for loudspeaker lines.
Allows the impedance of loudspeaker lines to be checked and the
necessary power in a 100 or 70 V line installation to be estimated, in order
to choose the correct amplifier.
3 measurement scales: 200 Ω, 2 kΩ and 20 kΩ.
Easy to read LCD screen.
Power meter for 70 and 100 V line loudspeakers.
Easy to use.
INPUTS 2 banana plugs to connect the test leads.
RESOLUTION
(MEASUREMENT
ACCURACY)
200 Ω: 0.1 Ω (±1% ±2)
2 kΩ: 1 Ω (±1% ±2)
20 kΩ: 10 Ω (±1% ±2)
POWER SUPPLY 9 V DC, 1 x 9V 6LR61 type battery
DIMENSIONS 86 x 182 x 38 mm depth
ACCESSORIES Rubber protector
2 sets of test leads: with alligator clip terminals and precision tips
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EN
WARRANTY
This product has been tested and has passed the corresponding quality control prior to being put on the market.
FONESTAR guarantees the suitability of the product for its specified use during a period of 2 years from the delivery date
and commits itself to repair or substitute the goods as expressed in the Spanish law ‘La Ley General para la Defensa de
los Consumidores y Usuarios, Real Decreto Legislativo 1/2007 16 oviembre.
The lack of conformity in the first six months after purchase, due to a manufacturing defect, will be rectified with no more
than showing the proof of purchase. After six months FONESTAR reserves the right to demand proof of the product being
sold with that problem.
This warranty does not include damage produced by: inappropriate use or negligence, accidents, worn out parts due to
use, breakages, burns, spilt liquids or other substances, excessive humidity, battery deterioration and internal manipulation
of the device, the software or its components by unauthorized persons, and in general any use that is unrelated to the
nature and purpose of the product.
If any service is needed during the warranty period because of lack of conformity, please contact the business or distributor
where the product was purchased in no more than 2 months after being conscious of the problem. It is only necessary to
contact FONESTAR if it is impossible or imposes an undue burden for them to solve it.
To benefit from this warranty it is necessary to show the proof of purchase with the date clearly visible, with no corrections
or crossing out.
This document adds information, and never decreases the consumers’ rights, which in all cases are protected by the
Spanish law ‘La Ley General para la Defensa de los Consumidores y Usuarios, Real Decreto Legislativo 1/2007 16
oviembre.
FONESTAR is a member of ECOEMBALAJES ESPAÑA, S.A. “ECOEMBES”, with number 03497 and all our products carry the symbol, backed by our membership
and subscription to the above mentioned organization with the recycling and subsequent management of our packaging.
FONESTAR is registered in the RAEE (Registro de Aparatos Eléctricos y Electrónicos) in a special section REI (Registro de establecimientos Industriales), with
the entry number 001851.
FO ESTAR S.A. - IF A28780443 - Polígono Trascueto - 39600 - Revilla de Camargo, Cantabria (Spain)
www.fonestar. om
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www.fonestar.com
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