UT387D - Measurement Uni-T - Free user manual and instructions
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| Product Type | Cable Length Tester / Network Tester |
| Brand | Uni-T |
| Model | UT387D |
| Dimensions (Approx.) | 140 x 70 x 30 mm |
| Weight (with battery) | 200 g |
| Power Supply | 9V battery (6F22 / NEDA 1604) |
| Battery Life | Approx. 20 hours continuous use |
| Display | Backlit LCD |
| Measurement Range (Twisted Pair) | 0 - 300 m |
| Measurement Range (Coaxial) | 0 - 150 m |
| Resolution | 0.1 m |
| Accuracy | ±5% ± 5 digits |
| Test Functions | Cable length, continuity, pair identification, fault detection (short, open, miswire) |
| Auto Power Off | After 10 minutes of inactivity |
| Operating Temperature | 0°C to 40°C |
| Storage Temperature | -10°C to 50°C |
| Relative Humidity | < 80% RH |
| Safety Rating | CAT II 50V |
| Applicable Cable Types | Cat5, Cat6, RG58, RG59, and similar coaxial/twisted pair |
| Accessories Included | Test leads, alligator clips, carrying case, manual |
| Maintenance | Keep clean, replace battery when low, avoid moisture and extreme temperatures |
Frequently Asked Questions - UT387D Uni-T
How do I calibrate the UT387D before measurement?
The UT387D features automatic zero calibration. Simply connect the test leads to the unit and press the 'CAL' button (if available) or ensure the leads are shorted and the device will auto-calibrate. Refer to the manual for specific steps.
What types of cables can I test with the UT387D?
The tester is designed for twisted pair cables (Cat5, Cat6, etc.) and coaxial cables (RG58, RG59). It can measure length, identify pairs, and detect faults like opens, shorts, and miswires.
How do I replace the battery in the UT387D?
To replace the battery, open the battery compartment on the back of the unit using a screwdriver. Remove the old 9V battery and insert a new one (6F22 or NEDA 1604), ensuring correct polarity. Close the compartment securely.
Why does my UT387D show inaccurate length readings?
Inaccurate readings can occur due to improper calibration, low battery, or using unsupported cable types. Ensure the device is calibrated with shorted leads, battery is fresh, and the cable type is correctly selected. Also check that the cable is not damaged.
Can the UT387D test live cables?
No, the UT387D is designed for unpowered cables only. Testing live cables can damage the tester and pose a safety risk. Always disconnect cables from any power source before testing.
What does the 'OPEN' fault mean on the display?
An 'OPEN' fault indicates that there is a break in the cable conductor or the cable is not properly connected to the tester. Check the connections and inspect the cable for physical damage.
How do I interpret the pair identification results?
When testing twisted pair cables, the UT387D displays the pair numbers (e.g., 1-2, 3-6) and indicates if they are correctly wired. If a pair is miswired, the display will show an error code. Refer to the manual for fault code explanations.
What is the maximum cable length the UT387D can measure?
For twisted pair cables, the maximum length is 300 meters. For coaxial cables, it is 150 meters. Measurement accuracy may decrease near the maximum range.
Does the UT387D have automatic power-off?
Yes, the device automatically powers off after 10 minutes of inactivity to conserve battery life. To wake it up, press any button.
How do I clean and maintain the UT387D?
Clean the unit with a soft, dry cloth. Do not use solvents or abrasive cleaners. Keep the tester in a dry place when not in use. Avoid exposure to extreme temperatures and humidity.
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