ok2bwn T10 User manual
instruction manual
T10
ACCUMULATOR TESTER FOR ARDF RECEIVERS
T10 tester is designed for accumulator status check of ARDF receivers of
COMPACT and SUPERFOX series (and other similar types as well). It is a useful
tool, necessary for the proper treatment of NiCad accumulators.
FOREWORD
4,8V accumulator 7,2V accumulator
UOUIUOUI
>5,4V >4,8V >8,0V >7,0V just charged just after charging
~4,8V >4,2V ~7,2V >6,4V charged, OK
~4,5V <4,0V ~7,0V <6,0V discharged, OK, CHARGE!
~4,8V <4,0V ~7,2V <6,0V just charged lifetime ends, EXCHANGE!
<4,0V <<4,0V <6,0V <<6,0V deep discharged, CHARGE!
<4,0V <<4,0V <6,0V <<6,0V just charged bad, EXCHANGE!!
note result
! NEVER connest the tester to the 230 V mains, any AC voltage or any DC
voltage higher than 16V! This will ruin the tester and possibly cause
an injury or electrical shock!
Before measurement, check the zero position of the meter. If necessary, adjust
it by the screw on the panel.
CAUTION
QUICK TEST
If both voltages (without or under load) are in black field (according to the
source voltage), the source is charged and OK.
DETAILED TEST
1. 6F22 battery test
The new battery voltage without load should be min. 9.5 V. If the voltage under load
is higher than 7V, you can use it, otherwise exchange for the new one.
2. NiCad accumulator 280 mAh test − see the table:
( UO− voltage without load, UI− voltage under load )
MEASUREMENT EVALUATION
CONNECTOR PIN−OUT:
4positive voltmeter pole
2negative voltmeter pole
1
4
2
5
3
SPECIFICATIONS
voltage range 10 V DC
internal resistance 7 kohm
load current at 9,0V 250 mA
at 7,2V 225 mA
at 4,8V 180 mA
Measuring error 5% max
Dimensions: 90(h)x60(w)x30(d) mm
TECHNICAL INFORMATION
1. Connect the tester to the receiver.
2. Now read the accumulator voltage without load (UO).
3. Push the button and read the accumulator voltage under load (UI ). Push only
shortly, max. 2 secs (otherwise you would discharge the accumulator unnecessarily).
NOTE: Hold the tester horizontally while measuring.
MEASUREMENT
The voltage of the chemical power sources decreases while discharging the source.
This is used for the discharge level of the accumulator or battery.
Apart from alkaline or zinc−coal batteries, the discharge characteristic of nickel−
cadmium (NiCad) accumulators is very flat, it means, their voltage decreases only
slowly during discharge and sinks at the end of discharge. The accumulator volage
itself is therefore unsuitable for the discharge level check.
In practice, other phenomenon is used: internal resistance of the accumulator increases
while discharging. The accumulator voltage under load is lower by the voltage decrease
on the internal resistance. Evaluating this decrease, we can seriously estimate the
accumulator discharge level.
In order to get significant voltage decrease, we use the load current about ten times
higher, than normal receiver consumption. Do not overload the accumulator by too
long measuring (see below).
THEORY OF OPERATION
Jiří Mareček, OK2BWN
CZ − 664 01 Bílovice nad Svitavou, Obřanská 593
phone/fax +420 545227041, e−mail: marecek@sky.cz
web: http://www.marecek.sky.cz
Should this equipment malfunction under normal use, it will be repaired without
charge for a period of one year from the date of purchase.
The customer shall not have any claim under this warranty for repair or adjustment
expenses if the trouble is caused by improper, rough or careless treatment or me−
chanical damage, by a fire or other natural calamity or by improper repair or adjust−
ment made by anyone other than manufacturer.
After the first year of use manufacturer offers the free of charge adjustment and
check of the equipment.
Any other information, service or modifications are provided by the manufacturer.
WARRANTY, SERVICE
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