Accessory Uni-T UT151C
3 of 3 Article
The UNI-T digital automotive multimeter provides a sophisticated measurement technology at a very good price / performance ratio. The automotive Multimeter UT107 effectively helps diagnosing problems with the electronic components of an automobile. This part gives a special introduction as to how the Meter UT107 is used to diagnose any trouble with a fuse, switch, solenoid, relay, starting and charging systems, ignition system, fuel system and engine sensor.
Besides the quality, the measurement devices distinguish by their ease of use, good legibility of the display and sophisticated measurement functions. UNI-T digital multimeters also fulfill the important details of everyday measuring, such as the almost immediate response of the continuity test, reliable measurement results, and conservative use of the battery. If you have ever worked with a digital multimeter from one of the various cheap manufacturers, you are familiar with problems such as continuity tests taking several seconds, noticeable deviation of measurement results if the battery is low, and rapid battery drain...
Dwell Testing
It was very important in the past to test the dwell of the cut-off switch of an ignition system. "Dwell testing" is measuring the duration of a cut-off switch remaining off, while the cam is turning. As an automobile is now ignited electronically, it is no longer necessary to adjust the dwell. In addition, the dwell testing can also be used to test a mixed-controlled solenoid. (e.g. GM feedback carburetor).
Starting/Charging System Testing
The on-off package of the engine starting system consists of a battery, engine starting button, solenoid and relay starting buttons, lead connections and lines. During the operation of the engine, the charging system keeps the battery charged. This system consists of an AC generator, voltage calibrator, lead connections and circuits. The multimeter is an effective tool for checking these systems.
- Fuse Testing
- Load-Free Battery Testing
- Battery Power Consumption Testing when the Engine Is off
- Switch Testing
- Solenoid or Relay Testing
- Trigger Voltage Battery Load Testing
- Voltage Drop Testing
- Charging System Voltage Testing
Engine Tach Testing (Rotation Speed, RPMx10)
The RPM means the rotating frequency of the main shaft of the engine per minute.
Hall Switch/Sensor Testing / Magnetic Resistance Sensor
When the tach and dwell are tested in the computer of the automobile, a Hall sensor is used. The Hall sensor is normally used in the ignition system to detect the position of the camshaft, so the computer of the automobile can set the optimal time for the ignition and the opening of the fuel injector. The functions of a magnetic resistance sensor is similar to those of a Hall sensor, and the testing methods of both sensors are also similar.
Fuel System Testing
It is necessary to add a more accurate engine fuel control to a low injection automobile. Since 1980, the automotive manufacturing industry uses electronically-controlled carburetor and fuel injection, in order to achieve lower fuel injection.
Oxygen Sensor
The oxygen sensor is used to test the oxygen content in the exhaust, giving rise to an appropriate voltage or resistance. A low voltage (high resistance) means the excessive output of oxygen content in the exhaust, while a high voltage (low resistance) results in insufficient oxygen content. The computer regulates the ratio between the air and the fuel according to the high or low voltage.
| Measurement | Range | Accuracy | Resolution |
|---|---|---|---|
| DC Voltage (DCV) | 200.0 mV 2.000 V 20.00 V 200.0 V 1000 V | ±(0.5%+2 dig.) ±(0.5%+2 dig.) ±(0.5%+2 dig.) ±(0.5%+2 dig.) ±(0.8%+2 dig.) | 0.1 mV 1 mV 10 mV 100 mV 1 V |
| AC Voltage (ACV) 40 Hz - 400 Hz | 200.0 V 750 V | ±(0.8%+5 dig.) ±(0.8%+5 dig.) | 100 mV 1 V |
| DC Current (DCA) | 200.0 mA 10.00 A | ±(0.8%+5 dig.) ±(1.2%+5 dig.) | 0.1 mA 10 mA |
| AC Current (ACA) | |||
| Resistance | 200.0 Ω 2.000 kΩ 20.00 kΩ 200.0 kΩ 2.000 MΩ 20.00 MΩ | ±(0.8%+5 dig.) ±(0.8%+5 dig.) ±(0.8%+5 dig.) ±(0.8%+5 dig.) ±(0.8%+5 dig.) ±(1.5%+5 dig.) | 0.1 Ω 1 Ω 10 Ω 100 Ω 1 kΩ 10 kΩ |
| 12 V Battery (120 Ω / 2 W load) | 20.00 V | ±(3.0%+5 dig.) | 10 mV |
| Frequency | 2000 Hz | ±(2.0%+5 dig.) | 1 Hz |
| Dwell Testing | 4 CYL 6 CYL 8 CYL | ±(3.0%+5 dig.) ±(3.0%+5 dig.) ±(3.0%+5 dig.) | 0.1° 0.1° 0.1° |
| Tach (Rotation Speed) Testing | 4 CYL 6 CYL 8 CYL | ±(3.0%+5 dig.) ±(3.0%+5 dig.) ±(3.0%+5 dig.) | 10 RPM 10 RPM 10 RPM |
| Temperature °C 1) | -40°C ~ 0°C 0°C ~ 400°C 400°C ~ 1000°C | ±(3.0%+9 dig.) ±(1.0%+7 dig.) ±(2.0%+10 dig.) | 1°C 1°C 1°C |
1)The included K-type temperature probe can be used for temperatures up to 230°C, do not use it with higher temperatures!
| Function | Digital Multimeter UT107 |
|---|---|
| USB Interface | |
| True RMS (TRMS) | |
| Auto Range | |
| Manual Range | |
| Data Logging | |
| Data Recall | |
| Diode test | |
| Transistor test | |
| Continuity test | (instant reaction time below 0.1 seconds!) |
| Low battery indication | |
| Relatively measuring | |
| Data hold | |
| Min-Max / Peak hold | |
| Auto power-off | |
| Overload protection | X Fuse 1: F315 mA 250 V, ⌀5.0 x 20 mm; Fuse 2: F10 A 250 V, ⌀5.0 x 20 mm |
| Shockproof Protection | |
| Backlight | |
| "Analogue" Bargraph | |
| Max. Reading | 1999 (3½digits) |
| LCD Size | 60 mm x 54 mm |
| Sampling rate | Approx. 2 times / second |
| Details | Digital Multimeter UT107 |
|---|---|
| Battery | 9 V Block Battery (included in delivery) |
| Safety standard | CAT II 1000 V CAT III 600 V |
| Dimensions | 17.9 cm × 8.8 cm × 3.9 cm (7.05" × 3.46" × 1.54") |
| Weight without accessories / packaging | 353 g (with battery) (0.78 lb) |
| Weight with accessories / packaging | 580 g (1.28 lbs) |
| Warranty | 2 Years |
