UNI-T UT685B

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Contents
I. Overview ---------------------------------------------------------------------------------------- 3
II. Accessories ----------------------------------------------------------------------------------- 3
III. Safety Information -------------------------------------------------------------------------- 4
IV. Features --------------------------------------------------------------------------------------- 4
V. Display Features (UT685B) --------------------------------------------------------------- 5
VI.Testing Mode --------------------------------------------------------------------------------- 6
6.1 Testing Twisted-Pair Cabling --------------------------------------------------------- 6
6.2 Testing Coaxial Cabling --------------------------------------------------------------- 12
VII.POE Mode ---------------------------------------------------------------------------------- 14
VIII.Tone Mode --------------------------------------------------------------------------------- 15
8.1 Tone Mode Display ------------------------------------------------------------------- 15
8.2 UT683R Receiver (For UT685B KIT only) -------------------------------------- 16
IX. Calibrating Length Measurements (Only for test mode) ------------------------- 18
9.1 Setting the NVP to a Specified Value -------------------------------------------- 18
9.2 Determining a Cable’s Actual NVP ----------------------------------------------- 19
X. Backlight ------------------------------------------------------------------------------------ 19
XI. Unit of Length ------------------------------------------------------------------------------ 19
XII. Auto Power Off --------------------------------------------------------------------------- 19
XIII. Other functions -------------------------------------------------------------------------- 20
13.1 Low battery indication ------------------------------------------------------------- 20
13.2 Troubleshooting -------------------------------------------------------------------- 20
13.3 Specifications ----------------------------------------------------------------------- 20
XIV. Maintenance ----------------------------------------------------------------------------- 20
UT685B/UT685B KIT
EN

UNI-T UT685B Specifications

General

Brand	UNI-T
Model	UT685B
Category	Measuring Instruments
Language	English

Summary

Safety Information

Device Features

Mode Knob Functionality

Power Button Operation

Unit and Backlight Control

Display Features

Numeric Display with Units

Short Circuit Indicator

Low Battery Indicator

Wiremap Diagram Display

Fault and High Voltage Warnings

Testing Modes

Twisted-Pair Cabling Test

Procedure for testing twisted-pair network cables.

Typical Twisted-Pair Test Results

Examples of common testing outcomes for twisted-pair cables.

Coaxial Cabling Test

Procedure for testing coaxial cables.

Typical Coaxial Test Results

Examples of common testing outcomes for coaxial cables.

Twisted-Pair Cable Faults

Open Circuit Detection

Describes how an open circuit fault is displayed.

Short Circuit Detection

Describes how a short circuit fault is displayed.

Crossed Wires Identification

Describes how crossed wires are identified.

Crossed Pairs Detection

Describes how crossed pairs are identified.

Split Pair Detection

Describes how split pairs are identified and their impact.

Advanced Testing Functions

Ethernet Port Detection

POE Switch Detection

How the tester identifies POE switches and powered devices.

Cable Voltage Detection

How the tester detects and displays cable voltage.

Detailed Wire Pair View

Telephone Network Cabling

Star Topology Connections

Bus Topology Connections

Coaxial Cable Faults

Good Coaxial Cable Results

Describes the measurement for a good coaxial cable.

Open Coaxial Cable

Short Coaxial Cable

Coaxial Cable Voltage

POE Mode Operation

POE Detection and Standards

Detects POE power, identifies standards (af/at/bt).

Tone Mode Operation

Tone Mode Display

UT683 R Receiver Features

Wire Tracking

Twisted-Pair Wire Tracking

Coaxial Cable Tracking

Wire Tracking Diagram

Length Measurement Calibration

Setting NVP to a Specified Value

Procedure for setting the Nominal Velocity of Propagation (NVP).

Determining Actual NVP

How to measure and adjust the cable's actual NVP for accuracy.

Additional Functions and Maintenance

Low Battery Indication

Troubleshooting Common Issues

Solutions for common problems like power-on or measurement inaccuracies.

Technical Specifications

Device Maintenance