UNI-T UT18A វ៉ុលtage និង Continuity Tester

សេចក្តីផ្តើម

• 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.

ភាពជាក់លាក់

• វ៉ុលtage measurement range: up to approx 690 V AC/DC (for this series)
• Input protection: 600 Vrms (for some versions)
• លើសវ៉ុលtage 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.

ការប្រើប្រាស់

1. វ៉ុលtagអ៊ីពិនិត្យ: 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. ការធ្វើតេស្តបន្ត: 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.

សុវត្ថិភាព

• 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.

និមិត្តសញ្ញាដែលបានយោងនៅក្នុងសៀវភៅណែនាំ

• The manual includes necessary information regarding the safe usage and equipment maintenance and, before use, read through each section of the manual.
• ការខកខានក្នុងការអានសៀវភៅណែនាំ ឬយល់អំពីវិធីសាស្រ្តនៃការប្រើប្រាស់ឧបករណ៍ដែលបានបញ្ជាក់នៅក្នុងសៀវភៅណែនាំនឹងនាំទៅដល់ការរងរបួសរាងកាយ និងការខូចខាតឧបករណ៍។

និមិត្តសញ្ញានៅលើបន្ទះអ្នកសាកល្បង និងការពិពណ៌នារបស់វា (រូបភាពទី 1)

1. Test pen L 1;
2. Test pen L2;
3. វ៉ុលtage ការចង្អុលបង្ហាញ (LED);
4. អេក្រង់ LCD;
5. វ៉ុលខ្ពស់tagការចង្អុលបង្ហាញ;
6. AC indication;
7. សញ្ញានៃការបន្ត;
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. ពិល
15. Test pen cap;
16. គម្របថ្ម

រូបភាពទី 2 ផ្តល់នូវការពិពណ៌នាលម្អិតនៃបន្ទះ LCD ។

1. ការចង្អុលបង្ហាញរបៀបស្ងាត់;
2. ការចង្អុលបង្ហាញរបៀប HOLD;
3. វ៉ុលទាបtage ការចង្អុលបង្ហាញអំពីថ្ម;
4. វ៉ុលtage ការវាស់វែង;
5. ការវាស់វែងប្រេកង់;
6. វ៉ុលឌីស៊ីtage ការវាស់វែង
7. វ៉ុលអេស៊ីtage ការវាស់វែង;
8. វ៉ុលtage indication (LCD segment code);
9. វ៉ុលខ្ពស់tagការចង្អុលបង្ហាញ;
10. សញ្ញានៃការបន្ត;
11. ការចង្អុលបង្ហាញ RCD;
12. ការចង្អុលបង្ហាញដំណាក់កាលរ៉ូតារី

ការណែនាំអំពីប្រតិបត្តិការ និងការប្រើប្រាស់វិសាលភាពរបស់អ្នកសាកល្បង

• វ៉ុលtage 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 ការចង្អុលបង្ហាញនិងវ៉ុលទាបtage ការចង្អុលបង្ហាញអំពីថ្ម។ លើសពីនេះ ពិលដែលភ្ជាប់ជាមួយប៊ិចសាកល្បងផ្តល់នូវកម្មវិធីងាយស្រួលក្នុងបរិយាកាសងងឹត។
• 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
• ឧបករណ៍សាកល្បងអាចអនុវត្តបានក្នុងឱកាសផ្សេងៗដូចជា គ្រួសារ រោងចក្រ នាយកដ្ឋានថាមពលអគ្គិសនី។ល។

lt has the following characteristics:

1. ដើម្បីការពាររបួសរាងកាយ វាត្រូវបានរចនាឡើងជាមួយនឹងអាវការពារ;
2. LED indication (UT18NB/C);
3. LCD វ៉ុលtage and frequency display (UT18C/D);
4. AC / DC បានវាស់រហូតដល់ 690V;
5. ការវាស់វែងបន្ត;
6. ចង្អុលបង្ហាញទំនាក់ទំនងដំណាក់កាលក្នុងចំណោម AC បីដំណាក់កាល;
7. ទាំង buzzing mode និង silent mode គឺស្រេចចិត្ត។
8. Detection without battery (UTI 8A/B/C);
9. Illumination function;
10. មុខងារត្រួតពិនិត្យដោយខ្លួនឯង;
11. វ៉ុលថ្មទាបtage ការចង្អុលបង្ហាញនិងការវាស់វែង voltage over range indication;
12. RCD test (UT18B/C/D);
13. រង់ចាំដោយស្វ័យប្រវត្តិ។

វ៉ុលtage ការវាស់វែង

• គោរពបទប្បញ្ញត្តិនៃការធ្វើតេស្តសុវត្ថិភាពដែលមានចែងក្នុងប្រការ 3 ។

វ៉ុលtage 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 voltagអ៊ី ហើយ​ដូច្នេះ​នឹង​ការ​បង្ហាញ​ប៉ូល LED (ឬ​កូដ​ផ្នែក LCD) ការ​ចង្អុលបង្ហាញ AC LED (ឬ LCD segment code) ការ​បង្ហាញ​ការ​បិទ LED (ឬ LCD segment code) ការ​ចង្អុលបង្ហាញ RCD LED (ឬ LCD segment code) ដំណាក់កាលបង្វិល ការចង្អុលបង្ហាញ LED (ឬលេខកូដផ្នែក LCD) និងវ៉ុលខ្ពស់។tage LED (ឬលេខកូដផ្នែក LCD) ការចង្អុលបង្ហាញ។

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 voltage តិចជាង 5V ហើយមិនផ្តល់ការចង្អុលបង្ហាញត្រឹមត្រូវខណៈពេលដែលវាស់វ៉ុលtage គឺ 5Vac/dc។ ការបំភ្លឺបន្ត ឬពន្លឺ AC ឬវ៉ុលខ្ពស់។tage 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 voltagអ៊ី វ៉ុលខ្ពស់tage LED នឹងត្រូវបានបំភ្លឺ ហើយសំឡេងប៊ីបនៅពេលវាស់វ៉ុលtage គឺជាវ៉ុលទាបបន្ថែមtage (ELV) កម្រិត។ ប្រសិនបើវាស់ voltage បន្តកើនឡើងនិងលើសពីការការពារការបញ្ចូល voltage (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. សម្រាប់វាស់វ៉ុល DCtage, 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 បង្ហាញវ៉ុលtage, 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. សម្រាប់វាស់វ៉ុល ACtage, 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 voltagតម្លៃ e និង LCD បង្ហាញវ៉ុលដែលត្រូវគ្នា។tage តម្លៃ។
   ចំណាំ៖ សម្រាប់វាស់វ៉ុល ACtage, 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.

ការរកឃើញដោយគ្មានថ្ម
អ្នកសាកល្បងអាចធ្វើការរកឃើញសាមញ្ញ ខណៈពេលដែលថ្មអស់ ឬមិនផ្តល់ថ្ម។ ភ្ជាប់ប៊ិចសាកល្បងពីរទៅនឹងវត្ថុដែលត្រូវវាស់ នៅពេលដែលវត្ថុមានវ៉ុលtage ខ្ពស់ជាងឬស្មើនឹង 50V AC / 120V DC, វ៉ុលខ្ពស់tage LED នឹងត្រូវបានបំភ្លឺដែលបង្ហាញពីវ៉ុលគ្រោះថ្នាក់tage និង LED នឹងភ្លឺជាបណ្តើរៗជាមួយនឹងការកើនឡើងវ៉ុលtage to be measured. The function is applicable only to UTI 8A/B/C.

ការធ្វើតេស្តបន្ត
ដើម្បីបញ្ជាក់ថាតើ conductor ដែលត្រូវវាស់ត្រូវបានអគ្គិសនី voltage 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.

ការធ្វើតេស្តបង្វិល (ការចង្អុលបង្ហាញដំណាក់កាល AC បីដំណាក់កាល)

• 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.
• ការចង្អុលបង្ហាញនិមិត្តសញ្ញា R, L LED ឬ L និង R គឺអាចអនុវត្តបានសម្រាប់ការធ្វើតេស្តបង្វិល ហើយការធ្វើតេស្តនេះអាចអនុវត្តបានសម្រាប់តែប្រព័ន្ធ AC បីដំណាក់កាលប៉ុណ្ណោះ។

1. វ៉ុលបីដំណាក់កាលtage 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 នឹងបង្ហាញពីវ៉ុលដែលត្រូវគ្នា។tagអ៊ី ឬ LCD បង្ហាញវ៉ុលដែលត្រូវគ្នា។tage តម្លៃ ដែលបានបង្ហាញ ឬបង្ហាញ voltage គួរតែជាដំណាក់កាល voltage ប្រឆាំងនឹងផែនដីប៉ុន្តែវ៉ុលបីដំណាក់កាលtage,

ដ្យាក្រាមនៃការធ្វើតេស្តប្រព័ន្ធអគ្គិសនីបីដំណាក់កាល (រូបភាពទី 4)

ចំណាំ៖ 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.

ការធ្វើតេស្ត RCD

• ដើម្បីកាត់បន្ថយការរំខាន voltage កំឡុងពេលវ៉ុលtage 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.
• សម្រាប់ការធ្វើតេស្តការធ្វើដំណើរ RCD សូមភ្ជាប់ប៊ិចសាកល្បងពីរទៅស្ថានីយ L និង PE នៃប្រព័ន្ធ 230Vac ក្រោមវ៉ុលធម្មតាtage 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.

ចំណាំ៖ ក្នុងករណីដែលគ្មានការវាស់វែង ឬការធ្វើតេស្ត វាជារឿងធម្មតាទេដែលមានអំពូល LED បំភ្លឺជាបន្តបន្ទាប់ និងសំឡេងប៊ីបជាបន្តបន្ទាប់ បន្ទាប់ពីចុចគ្រាប់ចុច RCD ក្នុងពេលដំណាលគ្នានៅលើប៊ិចសាកល្បងពីរ។ ដើម្បីជៀសវាងបញ្ហាមុខងារ កុំចុចគ្រាប់ចុច RCD ពីរនៅក្រោមរបៀបសាកល្បងដែលមិនមែនជា RCD ។

ការជ្រើសរើសរបៀបស្ងាត់
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 នៅលើ LCD នឹងបាត់។

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 នៅផ្នែកខាងលើនៃអ្នកសាកល្បងនឹងត្រូវបានបើក ដើម្បីជួយសម្រួលដល់ប្រតិបត្តិការរបស់អ្នក ហើយបន្ទាប់ពីប្រតិបត្តិការ សូមបិទភ្លើងដោយគ្រាន់តែប៉ះពន្លឺនៅលើប៊ូតុង។

ការប្រើប្រាស់អំពូល Backlight (អាចអនុវត្តបានសម្រាប់តែ UT18D)
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)
ដើម្បីសម្រួលដល់ការអាន និងការកត់ត្រា សូមកាន់ទិន្នន័យដែលបានវាស់វែង (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,

ការជំនួសថ្ម
មុនពេលប្រើវ៉ុលtage 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 និងភាពចាំបាច់នៃការជំនួសថ្ម។

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

1. Stop measurement and disconnect Owo test pens from the object measured;
2. វីសចេញវីស ធានាគម្របថ្មជាមួយទួណឺវីស;
3. ដោះគម្របថ្ម;
4. យកថ្មចេញដើម្បីជំនួស;
5. Install new battery according to the battery symbol and direction indicated on panel: and
6. បញ្ចូលគម្របថ្ម និងធានាវាដោយវីស។

ចំណាំ៖ សម្រាប់ការការពារបរិស្ថាន ថ្មអាចត្រូវបានប្រមូល និងកែច្នៃឡើងវិញនៅចំណុចប្រមូលថេរ ខណៈពេលដែលបោះចោលថ្មចោល ឬឧបករណ៍ផ្ទុកដែលមានកាកសំណល់គ្រោះថ្នាក់។

សូមអនុវត្តតាមបទប្បញ្ញត្តិនៃការកែច្នៃឡើងវិញដែលមានសុពលភាពក្នុងមូលដ្ឋាន ហើយបោះចោលថ្មដែលបានជំនួសដោយច្បាប់នៃការបោះចោលសម្រាប់ថ្មចាស់ និងឧបករណ៍ផ្ទុក។

ការថែទាំឧបករណ៍
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

ការសម្អាតឧបករណ៍
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.

សូចនាករបច្ចេកទេស

មុខងារពិសេស

សូចនាករភាពត្រឹមត្រូវនៃអេក្រង់ LCD៖

ការពិពណ៌នាអំពីមុខងារ និងប៉ារ៉ាម៉ែត្រ

• វ៉ុល LEDtage range: 12V-690VAC/DC
• វ៉ុល LEDtage indication point: 12V, 24V, 50V, 120M 230V, 400V, 690V
• LCD វ៉ុលtage range: 6v–690V AC/DC(UT18C/D); resolution: IV, voltage error: Digits);
• Frequency measurement range: 40Hz—400Hz, resolution: IHz, error: ±(3%+5Digits)
• វ៉ុលtage measurement: Auto
• Buzzing and silent mode is optional.
• ការចង្អុលបង្ហាញប៉ូល: ស្វ័យប្រវត្តិ
• Range selection: Auto
• Response time: LED<O. 1 s/LCD<1 s
• Peak current of test circuit: ls<3.5mA (ac./dc)
• ពេលវេលាសាកល្បង៖ ៣០ ស
• រយៈពេលនៃការស្តារឡើងវិញ៖ ២៤០ ស
• RCD test: Range: 230V (50Hz—400Hz); Current: AC30mA—40mA; Test time <10s, recovery time: 60s;
• លើសវ៉ុលtage 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
• លើសវ៉ុលtage protection class: CAT III 690V, CAT IV 600V
• ចំណាត់ថ្នាក់នៃការបំពុល៖ ៣
• safety rules IP65 EN61010-1 EN61243-3:2010
• ទំងន់: 238g (រួមបញ្ចូលថ្ម);
• Dimensions: 272x85x 31mrn
• Battery IEC LR03 (AAA) x2

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ការប្រុងប្រយ័ត្នសុវត្ថិភាព
ដើម្បីការពារការរងរបួសរាងកាយ ការឆក់អគ្គិសនី ឬភ្លើង សូមយកចិត្តទុកដាក់ជាពិសេសចំពោះធាតុដូចខាងក្រោមៈ

• មុនពេលប្រើវ៉ុលtage 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.
• សញ្ញាសម្គាល់ផ្សេងគ្នានៃវ៉ុលtagឧបករណ៍រាវរក e (រួមទាំងការចង្អុលបង្ហាញដែនកំណត់ ELV) មិនត្រូវប្រើសម្រាប់គោលបំណងវាស់វែងទេ។
• ត្រូវប្រាកដថាទាំងប៊ិចសាកល្បង និងឧបករណ៍តេស្តគឺនៅដដែលមុនពេលធ្វើតេស្ត។
• ត្រូវ​ប្រាកដ​ថា​រក្សា​ដៃ​អ្នក​តែ​នៅ​ក្នុង​ការ​ប៉ះ​នឹង​ចំណុច​ទាញ​ខណៈ​ពេល​ដែល​កំពុង​ប្រើ​ឧបករណ៍;
• កុំប្រើឧបករណ៍ខណៈពេលដែលវ៉ុលtage is beyond the range (referring to technical specification parameters)  and above 800V;
• មុនពេលប្រើត្រូវប្រាកដថាឧបករណ៍អាចដំណើរការបានល្អ។
• ដើម្បីធានាបាននូវប្រតិបត្តិការធម្មតារបស់អ្នកសាកល្បង សូមវាស់វ៉ុលដែលគេស្គាល់tage តម្លៃនៅក្នុងទីមួយ។
• ឧបករណ៍សាកល្បងមិនអាចប្រើប្រាស់បានទៀតទេ ក្នុងករណីមានការបរាជ័យមុខងារមួយ ឬច្រើន ឬគ្មានការចង្អុលបង្ហាញអំពីមុខងារ។
• កុំធ្វើតេស្តក្នុងស្ថានភាពសើម។
• Display functions well only when the temperature ranges -15C —+45 C and relative humidity is
• ឧបករណ៍ត្រូវតែជួសជុលក្នុងករណីដែលសុវត្ថិភាពផ្ទាល់ខ្លួនរបស់ប្រតិបត្តិករមិនអាចធានាបាន។
• សុវត្ថិភាពនឹងមិនត្រូវបានធានាទៀតទេក្នុងកាលៈទេសៈណាមួយដូចខាងក្រោម៖
  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.

សំណួរគេសួរញឹកញាប់

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.

ឯកសារ/ធនធាន

UNI-T UT18A វ៉ុលtage និង Continunity Tester [pdf] សៀវភៅណែនាំ UT18A វ៉ុលtage and Continunity Tester, UT18A, Voltage and Continunity Tester, Continunity Tester, Tester

ឯកសារយោង

• សៀវភៅណែនាំអ្នកប្រើប្រាស់