UNI-T UT18A Voltage او د دوام ټیسټر

پیژندنه

• The UNI-T UT18A is a professional-grade voltage and continuity tester designed for electricians, maintenance technicians, and other tradespeople. It provides quick LED-based (and in certain models: LCD) indication of AC/DC voltages, phase rotation in three-phase systems, polarity, and continuity, all within a compact pen-style form factor.
• Its design emphasizes safety (up to CAT IV 600 V) and versatility, making it suitable for industrial and commercial environments.

مشخصات

• والیtage measurement range: up to approx 690 V AC/DC (for this series)
• Input protection: 600 Vrms (for some versions)
• ډیر ولtage protection: ~750 VAC/DC for UT18A/B/C; other models go higher.
• Continuity test: 0 Ω…100 kΩ (approx) with buzzer & LED indicator
• Phase rotation test: 57 V-400 V (three-phase) for supported versions.
• Dimensions: 272 × 85 × 31 mm (approx)
• Battery: 2 × AAA (or IEC LR03) cells
• Safety category: CAT IV 600 V / CAT III 690 V (per series)
• Other features: LED indication, polarity detection, “no power” detection (voltage detection even without battery) on some models.

کارول

1. والیtage چک: Connect the two test leads (or test pens) to the circuit or conductor you wish to test. The UT18A will light the corresponding LED(s) to indicate approximate voltage level. For AC/DC voltages up to ~690 V, it will indicate. (Always check actual manual for exact model limits.)
2. Polarity check: For DC circuits, the tester will indicate positive vs negative polarity (depending on model) when the probes are connected.
3. د دوام ازموینه: With the circuit de-energised, connect the leads across the component or conductor. A continuity LED and audible buzzer will indicate if resistance is within the continuity threshold (e.g., < 100 kΩ).
4. Phase rotation / three-phase test: In three-phase AC systems, the device can help indicate phase rotation or sequence by connecting between phases (depending on model support).
5. “No-power” detection: Some versions of the UT18 series allow basic voltage presence indication even if the internal battery is exhausted (voltage detection circuit still active) — helpful for checking live circuits when the tester battery is low.

خوندیتوب

• Always assume a conductor is live until proven otherwise, and use the tester accordingly.
• Ensure you are using the tester within its rated category and voltage (e.g., CAT IV 600 V) environment. Using the rating above can lead to hazard.
• Wear appropriate personal protective equipment (PPE) when working on live circuits (gloves, eye protection, insulated tools).
• Before maintenance or continuity testing, make sure the circuit is de-energised and properly isolated.
• Connect the probes securely and avoid contact with exposed conductors. Do not hold the metal probe tips when measuring live circuits — hold only the insulated portion.
• The manual emphasises not using the instrument if it appears damaged, and maintenance/cleaning should be done while the tester is disconnected from any live circuit
• Check and replace batteries when low battery indication appears. A fatigued battery may cause unreliable readings.

په لارښود کې اشاره شوي سمبولونه

• The manual includes necessary information regarding the safe usage and equipment maintenance and, before use, read through each section of the manual.
• د لارښود په لوستلو کې پاتې راتلل یا په لارښود کې مشخص شوي د تجهیزاتو کارولو میتود نه پوهیدل به د فزیکي زیان او تجهیزاتو زیان لامل شي.

د ټیسټر پینل سمبول او د هغې توضیحات (شکل 1)

1. Test pen L 1;
2. Test pen L2;
3. والیtage اشاره (LED)؛
4. د LCD نندارې؛
5. لوړ ولtagای اشاره؛
6. AC indication;
7. د دوام نښه؛
8. Polar indication;
9. Rotary phase indication:
10. RCD indication (LED);
11. RCD test button:
12. Flashlight/self-inspection button;
13. HOLD mode/backlight button;
14. فلش رڼا
15. Test pen cap;
16. د بیټرۍ پوښ

شکل 2 د LCD پینل تفصيلي توضیحات وړاندې کوي.

1. د خاموش حالت نښه؛
2. د هولډ حالت اشاره؛
3. ټیټ ولtagد بیټرۍ نښه؛
4. والیtage اندازه کول؛
5. د فریکونسۍ اندازه کول؛
6. DC voltage اندازه کول
7. AC voltage اندازه کول؛
8. والیtage indication (LCD segment code);
9. لوړ ولtagای اشاره؛
10. د دوام نښه؛
11. د RCD نښې؛
12. د روټري پړاو نښې

د عملیاتي لارښوونې او د ټیسټر کارولو ساحه

• والیtage and continuity tester includes four models: UT18A, UT 18B, IJT18C and UT18D, has such functions as ACIDC (including three-phase alternating current) voltage measurement, three-phase AC phase indication,  frequency measurement, RCD test, continuity test, the simple test in case of no battery power supply, self-inspection, silent mode choice, overvoltage اشاره او ټیټ حجمtagد بیټرۍ نښه. سربیره پردې ، د ټیسټ قلم سره وصل فلش لائټ په تیاره چاپیریال کې مناسب غوښتنلیک چمتو کوي.
• To protect tester and, more particularly, the tester user, the tester is equipped with protecting jacket. The tester should be put on protective jacket after use and, preferably, placed inside tool kit so as to protect it against any damage. Never place the tester into your pocket
• ټیسټر په مختلفو مواردو کې د تطبیق وړ دی لکه کورنۍ، فابریکه، د بریښنا بریښنا ریاست، او نور.

lt has the following characteristics:

1. د فزیکي زیان ساتلو لپاره، دا د محافظت جاکټ سره ډیزاین شوی؛
2. LED indication (UT18NB/C);
3. LCD voltage and frequency display (UT18C/D);
4. AC/DC تر 690V پورې اندازه شوی؛
5. د دوام اندازه کول؛
6. د درې مرحلې AC ترمنځ د مرحلې اړیکې په ګوته کړئ؛
7. د غږ او خاموش حالت دواړه اختیاري دي؛
8. Detection without battery (UTI 8A/B/C);
9. Illumination function;
10. د ځان تفتیش فعالیت؛
11. د ټیټ بیټرۍ حجمtage اشاره او اندازه شوی حجمtage over range indication;
12. RCD test (UT18B/C/D);
13. اتوماتیک سټنډرډ.

والیtage اندازه کول

• د خوندیتوب ازموینې مقررات وګورئ چې په 3 ماده کې مشخص شوي.

والیtage gear of tester is composed of a line of LED or LCD segment codes, including 6V (UT18D), 12V, 24V, 50V, 120V.230V, 400V and 690V. LED (or LCD segment code) would be lighted one after another along with increased voltage، او په دې توګه به د قطبي LED (یا LCD برخې کوډ) اشاره، د AC LED (یا LCD برخې کوډ) اشاره، غیر فعال LED (یا LCD برخې کوډ) اشاره، RCD LED (یا LCD برخې کوډ) اشاره، روټري مرحله LED (یا LCD برخې کوډ) اشاره او لوړ والیtagد LED (یا LCD برخې کوډ) اشاره.

1. Complete self-check of tester before test. After pressing flashlight key 5s, tester would perform AC/DC  full range detection, accompanied by flashing LED (with exception to RCD light) and blinking displayed  LCD. If need to exit self-check, just touch the flashlight key. Connect two test pens to the conductor to be measured, select a known voltage for measurement, such as 220V socket, and ensure the measurement accuracy (See Figure 3), The tester cannot measure AC and DC voltagد 5V څخه کم او د اندازه کولو په وخت کې دقیقه نښه نه وړاندې کويtage 5Vac/dc دی. د تسلسل رڼا یا AC رڼا یا لوړ حجم روښانه کولtage symbol (IJT18D) and beeping buzzer are normal.
2. Tester would provide LED indication (UTI 8NB), LED+LCD indication (UT18C) and LCD indication (UT18D) while measuring AC or DC voltage. لوړ والیtage LED به روښانه شي او د بزر بیپ به کله چې حجم اندازه شيtage اضافي ټیټ حجم دیtage (ELV) حد. که اندازه شي حجمtage د ان پټ محافظت حجم زیاتولو او زیاتولو ته دوام ورکويtage (750Vac/dc) of the tester, 12\E690V LED would keep flashing (IJTI 8A/B/C), LCD displays “OLP (UT18C/D) and buzzer keeps beeping.
3. د DC حجم اندازه کولو لپارهtage, if 1-2 and Ll is connected respectively to the positive and negative pole of the object to be measured, LED would indicate the corresponding voltage، LCD حجم ښکاره کويtage, meanwhile the LED indicating positive pole would be illuminated, LCD displays “+9 “VDC” and, on the contrary, the LED indicating negative pole would be illuminated, LCD displays “-“”VDC”. If need to judge the positive and negative pole of the object to be measured, connect two test pens to the object to be measured randomly, the illuminating positive pole LED or LCD “+” on tester means the terminal connecting to L2 is the positive and the other connecting to Ll is the negative.
4. د AC حجم اندازه کولو لپارهtage, two test pens may be randomly connected to two ends of the object to be measured, AC LED would be illuminated, LCD displays “VAC” while LED indicates the corresponding voltage ارزښت او LCD د ورته حجم ښکارندوی کويtage ارزښت.
   یادونه: د AC حجم اندازه کولو لپارهtage, L and R phase inversion indication LED (UT18A/B/C) or L and R symbol (UT18D) would be illuminated, it means phase indication is unstable, L light (L symbol) or R light (R symbol) is illuminated, and even L and R light (L and R symbol) would be illuminated alternatively; L and R light (L and R symbol) would not provide correct and stable indication unless measuring three phase power system.

د بیټرۍ پرته کشف
ټیسټر ممکن ساده کشف ترسره کړي پداسې حال کې چې بیټرۍ پای ته رسیږي یا بیټرۍ چمتو شوې نه وي. دوه ټیسټ قلمونه د اندازه کولو لپاره اعتراض سره وصل کړئ، کله چې اعتراض حجم ولريtagد 50V AC/120V DC څخه لوړ یا مساوي، لوړ -voltagد LED به روښانه شي، خطرناک حجم په ګوته کويtage او LED به په تدریجي ډول د حجم د زیاتوالي سره روښانه شيtage to be measured. The function is applicable only to UTI 8A/B/C.

د دوام ازموینه
د دې تصدیق کولو لپاره چې ایا کنډکټر باید اندازه شي بریښنایی وي، حجمtage measurement method may be adopted to measure voltage at both ends of the conductor by using two test pens. Connect two test pens to the both ends of the object to be measured, if the resistance falls within O 100kQ, continuity LED (UT18NB/C) or continuity symbol ” (UT18D) would be illuminated, accompanied by continuous beeping buzzer; and if resistance falls within 100kQ 150kQ, continuity LED (UTI 8A/B/C) or continuity symbol “ (UT18D) may or may not be illuminated and buzzer may or may not beep: if resistance is >150kQ, continuity LED (UTI 8NB/C) or continuity symbol ” ” (UT18D) may not be illuminated and buzzer would not beep. Before any test, be sure the object to be measured is not electrified.

د گردش ازموینه (د درې پړاو AC مرحله نښه)

• A The measurement must be conducted in accordance with the safety test regulations specified in item 3.
• Aln the case of strong electric field interference or strong radiation test phase sequence, the test results may be unstable.
• د R، L LED یا L او R سمبول نښې د گردش ازموینې لپاره د تطبیق وړ دي او ازموینه یوازې د درې مرحلو AC سیسټم لپاره پلي کیږي.

1. درې مرحلې voltage test range: 57V—400V (50Hz—60Hz);
2. Hold the main body of tester (with finger holding handle), as shown in the following figure, connect test pen L2 to any phase and Ll to any of remaining two phases,
3. R or L LED would be illuminated, and after connecting a test pen to another phase, another LED (L or R) would be illuminated,
4. L or R LED would be illuminated accordingly when the position of two test pens are exchanged,
5. LED به ورته والی په ګوته کړيtage یا LCD ورته والیم ښکاره کويtage ارزښت، ښودل شوی یا ښودل شوی حجمtage باید د پړاو حجم ويtagد ځمکې پر وړاندې مګر درې پړاوه والیtage,

د دریم پړاو بریښنایی سیسټم ازموینې ډیاګرام (شکل 4)

یادونه: For measuring three-phase AC system, connect three measuring terminals to the corresponding terminal of three-phase system and, since the tester has only two test pen terminals, it is required to form the reference terminal by holding tester handle with finger (through the ground), therefore it would not accurately indicate the phase sequence of three-phase system if not holding the handle or wearing insulating gloves. In addition, it is necessary to ensure  the earth terminal (earth wire or shell) of three-phase system in contact with human body while measuring three-phase power system lower than 100V.

د RCD ازموینه

• د ګډوډۍ کمولو لپارهtagد حجم په جریان کېtage measurement, a circuit with impedance lower than the tester under
  normal measurement mode may be provided between two test pens. namely the RCD circuit system.
• د RCD سفر ازموینې لپاره ، دوه ټیسټ قلمونه د نورمال حجم لاندې د 230Vac سیسټم L او PE ترمینل سره وصل کړئtage measurement mode and press RCD key ” on two test pens, RCD system would trip and the LED indicating RCD (UT18B/C) or  RCD symbol (UT18D) would be illuminated if the circuit then generates AC current higher than 30mA. Particularly, if RCD cannot measure for a long time and, at 230V, the testing time should be <10s, cannot conduct continuous measurement and, after once test, wait 60s before next measurement.

یادونه: د اندازه کولو یا ازموینې په صورت کې ، دا عادي خبره ده چې په دوامداره توګه روښانه LED او دوامداره بیپ بزر ولرئ وروسته له دې چې په دوه ټیسټ قلمونو کې د RCD کیلي فشار ورکړئ. د فعال ګډوډۍ مخنیوي لپاره، د غیر RCD ازموینې حالت لاندې دوه RCD کیلي مه فشاروئ.

د خاموش حالت انتخاب
It is allowed to enter the silent mode while tester is under standby mode or normally used. After pressing flashlight key about Is, tester would bleep and LCD displays silence symbol”” (UTI 8C/D), and tester enters silent mode and, under which mode, all functions are similar to those under normal mode, with exception to the silent buzzer. If need to resume normal mode (buzzing mode), press flashlight key about Is and, after “bleeps”, the silence symbol په LCD به ورک شي.

Application of illumination function
Illumination function may be selected if need to use the tester at night or in a dark environment; after light touch on flashlight button on tester panel, the headlamp د ټیسټر په پورتنۍ برخه کې به ستاسو د عملیاتو اسانه کولو لپاره فعال شي او د عملیاتو وروسته ، په تڼۍ کې د ر lightا لمس سره ر lightا بنده کړئ.

د بیک لائټ غوښتنلیک (یوازې د UT18D لپاره پلي کیږي)
LCD displayed data may be hard to read at night or n a dark environment, allow the display clearly visible by turning on backlight on tester. Backlight would be turned on after pressing HOLD about Is and, after operation, turn off the light after pressing HOLD about Is. If tester enters standby mode while backlight is on, the light would remain illuminated when tester is awakened. The backlight cannot be turned off unless pressing HOLO about is again.

Application of HOLD function (UT18C/D)
د لوستلو او ثبت کولو اسانتیا لپاره، اندازه شوي ډاټا وساتئ (voltage and frequency value) by a light touch on HOLD on tester while using tester: after another Eght touch, hold status is relieved and restores to normal testing status,

د بیټرۍ بدلول
د والیت کارولو دمخهtage detector , Touch and hold the two probe tips together If shows and you hear the beeper, or in the silent mode ,  on . This makos sure that tho battery courco is not the battery source is exhausted.
Continuously flashing negative LED (IJTI ORB) or low-voltage symbol on LCD (IJTIdC/D) during use of tester indicates low-battery voltage او د بیټرۍ بدلولو اړتیا.

Replate battery according to following procedures (as shown in Figure 5):

1. Stop measurement and disconnect Owo test pens from the object measured;
2. د سکرو ډرایور سره د بیټرۍ پوښ خوندي کولو پیچونه لرې کړئ؛
3. د بیټرۍ پوښ لرې کړئ؛
4. د بدلولو لپاره بیټرۍ واخلئ؛
5. Install new battery according to the battery symbol and direction indicated on panel: and
6. د بیټرۍ پوښ دننه کړئ او د پیچونو سره یې خوندي کړئ.

یادونه: د چاپیریال ساتنې لپاره، بیټرۍ کیدای شي د راټولولو په ثابت ځای کې راټول او بیا وګرځول شي پداسې حال کې چې د ضایع کیدو وړ بیټرۍ یا جمع کونکي خطرناک کثافات لري.

مهرباني وکړئ د ځایی معتبر ریسایکل مقررات تعقیب کړئ او د زاړه بیټرۍ او جمع کونکي لپاره د ضایع کولو مقرراتو سره سم ځای په ځای شوي بیټرۍ تصفیه کړئ.

د تجهیزاتو ساتنه
No special maintenance requirement is provided unless UTI 8A/B/C/D tester should be used as per manual instruction and, in case of any functional abnormality during normal operation, stop using immediately and contact the nearest authorized service center

د تجهیزاتو پاکول
Before cleaning, disconnect tester from the circuit being tested. If the instrument gets dirty during normal use. wipe it with wet cloth or small quantity of gentle household cleanser instead of acid cleanser or solvent. Do not use the tester within 5h after cleaning.

تخنیکي شاخص

ځانګړې دندې

د LCD نندارې دقت شاخص:

د فعالیت او پیرامیټر توضیحات

• LED voltage range: 12V-690VAC/DC
• LED voltage indication point: 12V, 24V, 50V, 120M 230V, 400V, 690V
• LCD voltage range: 6v–690V AC/DC(UT18C/D); resolution: IV, voltage error: Digits);
• Frequency measurement range: 40Hz—400Hz, resolution: IHz, error: ±(3%+5Digits)
• والیtage measurement: Auto
• Buzzing and silent mode is optional.
• د قطبي نښې: اتومات
• Range selection: Auto
• Response time: LED<O. 1 s/LCD<1 s
• Peak current of test circuit: ls<3.5mA (ac./dc)
• د ازموینې وخت: 30s
• د رغیدو وخت: 240s
• RCD test: Range: 230V (50Hz—400Hz); Current: AC30mA—40mA; Test time <10s, recovery time: 60s;
• ډیر ولtage protection: 750VAC/DC
• On-off test: O kQ…100kQ; Accuracy: Rn+50%;
• Rotation test (three-phase AC): Voltage range: 57V—400V; Frequency range: 50 Hz—60Hz;
• A simple test (without battery): Voltage range: 50VAC&690VAC, 120VDC&690VDC (UT18A/B/C) ;
• Working temperature range: -15 C—+45 °C
• Storage temperature range: -20C—+60 °C
• Working humidity range: S85% RH
• ډیر ولtage protection class: CAT III 690V, CAT IV 600V
• د ککړتیا طبقه: 2
• safety rules IP65 EN61010-1 EN61243-3:2010
• وزن: 238g (د بیټرۍ په شمول)؛
• Dimensions: 272x85x 31mrn
• Battery IEC LR03 (AAA) x2

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• ټیلیفون: (86-769) 8572 3888
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د خوندیتوب احتیاطي تدابیر
د فزیکي زیان، بریښنا شاک یا اور څخه د مخنیوي لپاره، لاندې شیانو ته ځانګړې پاملرنه وکړئ:

• مخکې له دې چې د یو والیت کارولtage detector with audible indicator at locations with a high background noise level, it has to be determined whether the audible signal is perceptible. the voltage detectors are designed to be used by skilled persons and in accordance with safe methods of work.
• د حجم مختلف نښې نښانېtage کشف کونکی (د ELV محدودیت نښې په شمول) باید د اندازه کولو موخو لپاره ونه کارول شي.
• ډاډ ترلاسه کړئ چې دواړه د ازموینې قلم او د ازموینې وسیله د ازموینې دمخه ساتل کیږي؛
• ډاډ ترلاسه کړئ چې خپل لاس یوازې د دستګاه سره په تماس کې وساتئ د تجهیزاتو کارولو پرمهال؛
• هیڅکله د وسایطو څخه کار مه اخلئ پداسې حال کې چې حجمtage is beyond the range (referring to technical specification parameters)  and above 800V;
• د کارولو دمخه، ډاډ ترلاسه کړئ چې تجهیزات کولی شي ښه کار وکړي؛
• د ټیسټر نورمال عملیات یقیني کولو لپاره، یو پیژندل شوی حجم اندازه کړئtage ارزښت په لومړي سر کې.
• ټیسټر نور نشي کارول کیدی د یو یا څو فعاله ناکامیو یا هیڅ فعالې نښې په صورت کې.
• هیڅکله په لوند شرایطو کې ازموینه مه کوئ.
• Display functions well only when the temperature ranges -15C —+45 C and relative humidity is
• وسیله باید ترمیم شي که چیرې د چلونکي شخصي خوندیتوب تضمین نشي.
• خوندیتوب به نور په لاندې شرایطو کې تضمین نشي:
  1. Visible damage;
  2. Tester’s functions are inconsistent with functions that it supposed to have.
  3. It had been stored in inappropriate conditions for a long time.
  4. Subject to mechanical extrusion in transit.

FAQs

Q1: Can the UT18A measure DC voltage as well as AC voltage?

A1: Yes. The UT18A supports both AC and DC voltage measurements (up to approximately 690 V in many models of the UT18 series). The manual lists AC/DC capability including polarity detection.

Q2: Does the UT18A allow me to test continuity without the internal battery?

A2: The UT18A (and certain models in the UT18 series) features a “no-power” detection mode: even if the internal battery is exhausted, the tester can still give a basic voltage presence indication when voltages exceed a certain threshold (e.g., > 50 V AC/120 V DC). However, for full continuity testing and full functionality you still need the battery.

اسناد / سرچینې

UNI-T UT18A Voltagد e او دوام ټیسټر [pdf] د لارښوونې لارښود UT18A Voltage and Continunity Tester, UT18A, Voltage and Continunity Tester, Continunity Tester, Tester

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