1. Киришүү
The Mastech MS5908C Circuit Analyzer is a professional instrument designed for comprehensive electrical circuit analysis. It is capable of measuring AC voltage, performing RCD (Residual Current Device) and GFCI (Ground Fault Circuit Interrupter) tests, and analyzing circuit impedance. This device is suitable for use in environments with 220V AC input voltage and features an EU plug for the European market. It provides accurate readings for phase voltage, neutral wire voltage, томtage to earth, frequency, and conductor impedance for live, neutral, and earth wires.
Негизги өзгөчөлүктөр төмөнкүлөрдү камтыйт:
- True RMS (TRMS) AC Voltage өлчөө.
- Artificial load testing (5A, 8A, 10A) for wire drop measurement.
- Measurement of phase voltage, neutral wire voltage, томtage to earth, and frequency.
- Measurement of phase (live wire), neutral wire, and earth wire conductor impedance.
- Automatic power off to conserve battery life.
- Data hold function for convenient reading.
- Low battery display indicator.
2. Коопсуздук маалыматы
Before operating the Mastech MS5908C Circuit Analyzer, please read and understand all safety instructions. Failure to follow these instructions may result in electric shock, fire, or serious injury.
- Колдонуудан мурун, түзмөктүн ар дайым жакшы иштеп жатканын текшериңиз.
- Эгерде аппарат бузулгандай көрүнсө же изоляциясы бузулган болсо, аны колдонбоңуз.
- Эч качан көлөмдү өлчөөгө аракет кылбаңызtagкөрсөтүлгөн максималдуу баалоодон ашып кеткен ток күчтөрү же ток күчтөрү.
- Always disconnect the device from the circuit before opening the battery compartment.
- Токтогуч чынжырлар менен иштөөдө этият болуңуз.
- This device is rated for CAT III 300V and Pollution Degree 2 environments. Adhere to these ratings.
- Аппаратты кургак жана таза кармаңыз.
3. Продукт бүтүп калдыview
The Mastech MS5908C Circuit Analyzer features a robust design with an LCD display and intuitive controls for various electrical measurements.

Сүрөт 3.1: Алдыңкы view of the Mastech MS5908C Circuit Analyzer, showing the LCD screen and control buttons.
The device includes a clear LCD display for readings and indicators, along with several function buttons:
- Кубат баскычы: Аппаратты күйгүзүү же өчүрүү үчүн.
- FUNC баскычы: To cycle through different measurement functions.
- HOLD баскычы: To freeze the current reading on the display.
- Арткы жарык баскычы: To activate or deactivate the display backlight.
- TEST баскычы: To initiate specific tests, such as RCD/GFCI tests.
- Өйдө/төмөн жебе баскычтары: For navigation or adjusting settings.

Figure 3.2: Dimensional drawing of the Mastech MS5908C Circuit Analyzer, showing its physical measurements.
4. Орнотуу
4.1 Батареяны орнотуу
The Mastech MS5908C requires 6 AAA batteries for operation. These batteries are included with the device.
- Аппараттын артындагы батарея бөлүкчөсүн табыңыз.
- Батарея бөлүкчөсүнүн капкагын ачуу үчүн бурагычты колдонуңуз.
- Insert 6 AAA batteries, ensuring correct polarity as indicated inside the compartment.
- Батарея уясынын капкагын ордуна коюңуз жана аны бурама менен бекитиңиз.

4.1-сүрөт: Артка view of the MS5908C with the battery compartment open, illustrating battery placement.
4.2 Баштапкы күйгүзүү
After installing the batteries, press the power button to turn on the device. The LCD display will illuminate, and a self-test sequence may run briefly before displaying the default measurement mode.
5. Иштөө нускамалары
The MS5908C offers various measurement modes accessible via the FUNC button.
5.1 Негизги томtage жана Frequency Measurement
- Plug the MS5908C into the electrical socket to be tested.
- The device will automatically display the AC voltage жана жыштык.
- Press the FUNC button to cycle through different voltage readings, such as phase voltage, neutral wire voltagд, жана томtagд жерге.
5.2 Impedance Measurement
To measure the impedance of the live, neutral, and earth conductors:
- Ensure the device is plugged into the socket.
- Press the FUNC button until the impedance measurement mode is displayed.
- The device will show the impedance values for each conductor.
5.3 RCD/GFCI Testing
The MS5908C can test the trip time and current of RCDs and GFCIs.
- Plug the device into a socket protected by an RCD/GFCI.
- Press the FUNC button to select the RCD or GFCI test mode.
- Press the TEST button to initiate the test. The device will simulate a fault condition and measure the trip time and current.
- Observe the displayed results. A successful test indicates the RCD/GFCI is functioning correctly.
- Reset the RCD/GFCI after the test.
5.4 Wire Drop Measurement (Artificial Load)
This function measures the voltage drop under specific artificial loads (5A, 8A, 10A).
- Plug the device into the circuit.
- Press the FUNC button to select the wire drop measurement mode.
- Use the arrow buttons to select the desired artificial load (5A, 8A, or 10A).
- The device will display the voltagэ тамчы пайызtage.
5.5 Маалыматты кармоо жана жарыктандыруу
- Дайындарды кармоо: Учурдагы көрсөткүчтү дисплейде тоңдуруу үчүн КАРМОО баскычын басыңыз. Коё берүү үчүн аны кайра басыңыз.
- Арткы жарык: Press the backlight button to illuminate the display for use in low-light conditions. Press it again to turn off the backlight.
6. Техникалык тейлөө
6.1 Тазалоо
To clean the device, wipe the casing жарнама мененamp cloth and a mild detergent. Do not use abrasive cleaners or solvents. Ensure the device is completely dry before storage or next use.
6.2 Батареяны алмаштыруу
When the low battery indicator appears on the display, replace all 6 AAA batteries as described in Section 4.1. Always use new batteries of the same type.
6.3 Сактоо
If the device will not be used for an extended period, remove the batteries to prevent leakage. Store the circuit analyzer in a cool, dry place, away from direct sunlight and extreme temperatures.
7. Кыйынчылыктарды
This section provides solutions to common issues you might encounter with your MS5908C Circuit Analyzer.
- Түзмөк күйбөйт: Батареялар туура орнотулганын жана заряды жетиштүү экендигин текшериңиз. Зарыл болсо, батарейкаларды алмаштырыңыз.
- Туура эмес окуулар: Ensure the device is properly plugged into the socket. Verify that the correct measurement mode is selected.
- RCD/GFCI test fails: Ensure the RCD/GFCI is functional and properly wired. If the issue persists, consult a qualified electrician.
- Дисплей күңүрт же бүлбүлдөп жатат: Бул, адатта, батареянын кубаты аз экенин билдирет. Батареяларды алмаштырыңыз.
If you encounter problems not listed here or if the issue persists, contact Mastech customer support.
8. Техникалык шарттар
Detailed technical specifications for the Mastech MS5908C Circuit Analyzer are provided below.

Figure 8.1: Detailed specifications table for the MS5908C, including ranges, resolutions, and accuracies.
| Параметр | Диапазон | Резолюция | Тактык |
|---|---|---|---|
| Line Voltage | 85.0~265.0V | 0.1V | ±(1.0%+2) |
| Peak Line Voltage | 120.0~375.0V | 0.1V | ±(1.0%+2) |
| Тtage With Loading Equipments | 10.0~265.0V | 0.1V | ±(2.5%+2) |
| Line Frequency | 45.0~65.0Гц | 0.1Hz | ±(1.0%+2) |
| Impedance (Live and Neutral & Earth) | 0.00~3.00Ω > 3.00Ω | 0.01Ω | ±(2.5%+2) No ensure |
| Neutral-Ground Voltage | 0.0~10.0V | 0.1V | ±(2.5%+2) |
| RCD сапар убактысы | 1ms~6.5S | 1мС | ±(1.0%+2) |
| RCD Trip Current | 30mA ~ 37mA | 0.1мА | ±(1.0%+2) |
| GFCI саякат убактысы | 1ms~6.5S | 1мС | ±(1.0%+2) |
| GFCI Trip Current | 6mA ~ 9mA | 0.1мА | ±(1.0%+2) |
| Тtage Drop | 0.1~99.9% | 0.10% | ±(2.5%+2) |
| Жүктөө агымы | 5/8/10A | Жок | Жок |
Жалпы мүнөздөмөлөрү:
- Продукциянын өлчөмдөрү: 7.87 x 5.91 x 9.84 дюйм (200 x 150 x 250 мм)
- Элемент Салмагы: 2.2 фунт (1 килограмм)
- Кубат булагы: Батарея менен иштейт (6 x AAA батарейкалары, кошулган)
- Коопсуздук рейтинги: CAT III 300V, Pollution Degree 2
9. Кепилдик жана колдоо
9.1 Кепилдик маалыматы
The Mastech MS5908C Circuit Analyzer comes with a 1-year limited warranty from the date of purchase. This warranty covers defects in materials and workmanship under normal use. It does not cover damage caused by misuse, accident, unauthorized modification, or neglect. Please retain your proof of purchase for warranty claims.

Figure 9.1: Product packaging indicating a 1-year limited warranty.
9.2 Кардарларды колдоо
For technical assistance, warranty service, or general inquiries, please refer to the contact information provided on the Mastech official website or the documentation included with your product. When contacting support, please have your product model (MS5908C) and purchase details ready.





