twintex TI512 User manual

OPERATION MANUAL OF DIGITAL LC METER
1. General
This meter is a steady performance, battery-driven 3 1/2 digital LC meter, which has the figure
of unit symbol displaying, accuracy reading and wide range measurement. This meter has the
function of measuring inductance, capacitance test. In addition, it’s ideal for testing SMD
type components. Plus, the meter offers advanced features, such as the ability to perform
precision measurements. It is an ideal hand-held tool for labs, factories and radio-technology.
Please read this operation manual carefully before your operation!
2. Characteristic
2-1．General characteristic
Display：LCD display, Max. 1999
Inductance measure： 1uH～20H
Capacitance measure： 1pF～2000uF
Zero adjust：Capacitance under 20nF is manual ministrant zero adjust.
Over range：display“1”
Low battery indication：“ ”symbol display
Sampling rate：0-5s
Working temperature：0～40℃
Relative humidity ：less than 80%
Meter size：185mm×93mm×35mm（length×width×height）
Weight：Approx.290g（including 9V battery）
Power：one 9V battery (6F22 or equivalent）
Standard accessories：test leads, operation manual
2-2．Electric characteristic
Accuracy：±(% of reading + number of digit) at 23 ± 5℃, relative humidity<75% . One
year guarantee since production date.
2-2-1．Capacitance
Range Accuracy Resolution
2nF 1pF
20nF 10pF
200nF 100pF
2μF 1000pF
20μF
±(2.0%+5)
0.01μF
2000μF ±(5.0%+5) 1μF
2-2-2．Inductance
Range Accuracy Resolution
2mH 1uH
20mH 10uH
200mH 100uH
2H
±(2.0%+5)
1mH
20H ±(5.0%+5) 10mH
3、Operation
3-1 Panel description（SEE FIG.1）
1）LCD display：display the measuring value, unit and “ ”symbol;
2）Power switch：turn on/off the power;
3）Zero Adjust switch：zero adjust switch before measurement under
range 20nF;
4）Function knob：select range；
5）Input jack：test input COM;
6）Battery case.
3-2 Matters need attention before measurement
zWhen signal displays at the state of power on, should replace the battery to ensure the
accuracy;
zDo not switch the function knob when measuring.
zCapacitance measurement function is used to measure the capacitance value, can’t used to
measure the figure of merit of reactive power. It perhaps gets a wrong reading if measure
the capacitance value of resistance; before measuring, it should release the capacitor
completely. Beware of polarity when connects the polar capacitor. Do not connect the test
COM with voltage source; otherwise it will cause grievous damage. Do not connect the test
leads short-circuit, otherwise it will lead to the loss of extra heavy current, and it will
have over range display in all ranges. Please do not measure the capacitance on wire, though
it can measure, it will cause the big error and damage the meter (if the wire is not power
off or there exists the voltage, capacitance or without releasing the capacitance completely).
zUnder range 20nF maybe there is no way to zero adjust when using SMD test clip (the clip’s
capacitance is bigger than 20pF);
zInductance measurement function is used to measure the inductor value, can’t used to measure
the figure of merit of reactive power. It perhaps gets a wrong reading if measure the inductance
value of resistance;
z Please do not measure the inductance on line to avoid damaging the meter.
zBefore measuring, it should release the capacitor completely to avoid damage.
3-3 Capacitance measurement
Set the function knob to a proper capacitance range;
1) On the range under 20nF, setting the zero adjust switch till the LCD displays “000” ( but
it must insert the test leads or SMD test clip);
2) Insert the capacitor under tested to the “COM” or clip by test leads, the value will displayed
on LCD, which will read as unit of the selected range directly. If it displays “1”, it means
over range measure. If there is “1” or “00” before the displayed select a lower range
to increase the measurement resolution.

Note
1) If the capacitance under measured is unknown beforehand, should set the range knob from
the lower to the highest range,
2) If capacitance breakdown, it will display over range in all ranges; when there’s a lower
leaky capacitance, it will display over range or a big value which is much bigger than the
normal value. If turn off capacitance, the reading will display “0” at all ranges;
3) When test the small (pF) capacitance, the test leads more short more better, when measuring,
test points of test leads should be close to the pin of capacitance under measured to zero
adjust, thus can get a higher accuracy.
4) When use any test leads, please remember the test leads perhaps lead to a bigger capacitance.
Firstly, it should measure the capacitance value in the condition of the test leads is out
of measurement, write down the open-circuited value and deduct it from the test value, it
will get a correct test result, this result is the same under the other test condition;
5) Many capacitors (especially the electrolytic capacitor) have wide capacitance of condenser.
If the test result is bigger than the nominal value, there is no necessary to be surprised
at it, except the blocking capacitor. Usually the test result is seldom smaller than the
rated value.
6) When range changes, and the test value have significant changes, it usually can examine the
resist of leaky capacitor. At the low range, the existent effect of leaky capacitance can
reduce.
3-4 Inductance measure way
1) Set the function knob to a proper inductance range;
2) Insert the inductor under tested to the “COM” or clip by test leads, the value will
displayed on LCD, which will read as unit of the selected range directly. If it displays
“1”, it means over range measure. If there is “1” or “00” before the displayed select
a lower range to increase the measurement resolution.
Note
1) If the range under measured is unknown beforehand, should set the range knob from the lower
to the highest range,
2) In order to avoid leading into the stray induction, should use the short wire when the tiny
inductance;
3) This meter can’t be used to test inductance’s figure of merit. e.g.: it perhaps gets a wrong
reading when test the inductance of resistance.
4、Auto power off
The meter will be into sleeping mode when stopping working for 20 minutes; if you want to measure
you should restart the power. It won’t be power off when it LCD display full range 20%.
5、Maintenance
Do not try to modify the electric circuit.
Note:
1) Keep the meter away from water, dust and shock;
2) Do not store and operate the meter under the condition of high temperature, high humidity,
combustible, explosive and strong magnetic place;
3) Wipe the case with a damp cloth and detergent; do not use abrasives and alcohol;
4) If do not operate for a long time, should take out the battery to avoid leakage;
5) When signal displays, should replace the battery following the steps:
1) Take off the holster. (see the fig.)；
2) Unlock the screw and remove the battery case.
3) Take out the old battery and replace the new one. It's better to use alkaline battery for
longer life
4) Fit on the battery case and lock the screw;
5) Fit on the holster as the opposite way.
zThe specifications are subject to change without notice.
zThe content of this manual is regarded as correct, error or omits. Please contact with
factory.
zWe herby will not be responsible for the accident and damage caused by improper operation.
zThe function stated for this User Manual cannot be the reason of special usage.