www.altronics.com.au
Redback® Proudly Made In Australia
2
* Specifications subject to change without notice.
Distributed by Altronic Distributors Pty. Ltd. Perth. Western Australia. Phone: 1300 780 999 Fax: 1300 790 999
SYSTEM CHECK MODE
System check Mode is included for audible testing of
larger speaker installations. It allows the Q 2003 to run at
full output for a period of approximately 6 minutes so the
installer can walk around the install to check sound is present
on all speakers.
To activate this mode connect the test leads to the load to be
checked, ensure that an amplifier is not connected. Make
sure the Q 2003 is OFF then press the TEST button and hold
for 5 seconds. “SYSTEM CHECK” will display on the LCD
and a 1kHz tone will be put out the test leads.
SWITCHING OFF
To switch off the Q 2003 all you need to do is press the TEST
button again. The LCD will display “OFF” for a short time
then the unit will power down. The Q 2003 is also equipped
with an auto power off function. The unit will automatically
power down after a period of 20 seconds in Single test
mode and 6 minutes in System check mode, saving precious
battery life.
BATTERY INSTALLATION AND OR CHARGING
“LOW BATTERY” will display on the LCD when the battery
requires replacing or if a rechargeable 9V Nicad/Nimh battery
(such as the Altronics S 4740C, not supplied) needs charging.
To replace or install the 9V (type 216) battery required to
power the Impedance Meter, simply slide off the battery
compartment on the back of the unit. Remove and unclip
the old battery from the connector and replace it with a fresh
battery. Slide the cover back until it locks into place.
To recharge an installed Nicad/Nimh battery connect a
12VDC source (car battery, cigarette lighter socket or plug
pack) >300mA with a 2.1mm centre positive plug to the
charging socket located on the top of the Q 2003.
“CHARGING” will display on the LCD along with the charge
%. When the charge % reaches 100%, the unit will stop
charging and display “CHARGE FINISHED” on the LCD. The
charger can then be unplugged. The inbuilt charging circuit
is a slow charger and will take up to 12 hours to charge a
completely flat battery.
NOTE:
1) The Q 2003 will not function as an Impedance meter when
charging.
2) The charger can be removed at anytime during charging
though battery life will suffer.
3) The Q 2003 will still function when “LOW BATTERY” is
being shown on the LCD but the measured results may be
out by as much as 10%.
IMPORTANT GUIDELINES:
Don’t connect the meter to a line that has an amplifier
attached to it. The impedance of the output transformer
of an amplifier is extremely low and you could be easily
be looking for a non-existing short.
Don’t connect the meter to an active line. You will
damage the meter with the applied voltage.
Don’t continue to use a battery once the “LOW
BATTERY” is being shown on the LCD. The readings
you will get will be incorrect.
i
Wiring speakers in parallel for 70/100V line:
Where several speakers are to
be used at one time, on one circuit, it becomes necessary to use speakers fitted
with line-matching transformers. This is to overcome the effects of connecting
speakers in parallel and cable losses. The amplifier generally has an output
voltage of 100 volts (70 volts is typically used in North America, however
operation is similar). In this configuration the total wattage load on the amplifier
is derived from adding all the line transformer primary tap ratings together. For
example, 70 one watt speakers will have a total speaker load of 70 watts. Or
alternatively, it is conceivable to connect 100 one watt speakers to a 100 watt,
100 volt line amplifier.
Measuring 70/100V Line Speaker Impedance:
To measure amplifier system
load, you must use an impedance meter in order to measure the ac resistance
of the connected speaker network. Impedance cannot be measured with a
standard multimeter, as this measures the dc resistance. Use the Altronics
Q 2001 or similar impedance meter.
About 70V & 100V Line Speaker Systems
Load 70V 100V
0.5W 9.4kΩ 20kΩ
0.66W 7.12kΩ 15kΩ
1W 4.7kΩ 10kΩ
1.25W 3.76kΩ 8kΩ
2W 2.35kΩ 5kΩ
2.5W 1.88kΩ 4kΩ
3W 1.56kΩ 3.3kΩ
5W 940Ω 2kΩ
7.5W 626Ω 1.3kΩ
10W 470Ω 1kΩ
15W 313Ω 666Ω
20W 235Ω 500Ω
30W 156Ω 333Ω
40W 117Ω 250Ω
60W 78Ω 166Ω
100W 47Ω 100Ω
125W 37Ω 80Ω
250W 19Ω 40Ω
500W 9.4Ω 20Ω
