Unit UT8805E User manual

English Manua l
UT8805E Benchtop DigitalMu
l t i m e t e r

UT8805E Benchtop Digital Multimeter
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Preface
Thank you for purchasing the new benchtop digital multimeter. In order to use this product safely and
correctly, please read this manual thoroughly, especially the Safety Information part.
After reading this manual, itis recommended to keepthe manual at an easily accessible place,preferably
close to the device, for future reference.
Copyright Information
Copyright
Uni-Trend Technology (China) Co., Ltd. all rights reserved.
Trade Mark
UNI-T is the registered trademark of Uni-Trend Technology (China) Co., Ltd.
Declaration
UNI-T products are protected by patent rights in China and other countries, including issued and
pending patents.
Uni-Trend reserves the rights to any product specification and pricing changes.
Uni-Trend reserves all rights.Informationin thismanual supersedes all previously published versions.
No part of this manual may be copied, extracted or translated by any means without the prior
permission of Uni-Trend.

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General Safety Overview
This instrument strictly complies with safety standards of IEC61010-1, EN61010-2-030, pollution level II,
over voltage CATI 1000V, CAT II 300V and double insulated during design and manufacturing. It is IP65
waterproof and dustproof. In case the meter is not used properly as instructions, the protection provided
may be weakened or lost.
Please use the dedicated UNI-T power supply wire appointed to the local region or country for this
product, and check if there is any metal part exposed or insulating layer damage.
This product is grounded through the power supply ground wire. To avoid electric shock, grounding
conductors must be connected to the ground. Please be sure that the product is properly grounded
before connecting to the input or output of the product. The signal ground wire of the rear panel is the
same as the ground potential.
Please check the accessories and wires for any mechanical damage before usage. Please replace
the wire before use if it is damaged.
Please notice rated operating range and product marks. Never input over-range voltage into any
terminal or ground point of this product.
When measuring, do not touch any exposed wires, connectors, unused inputs or the circuits being
measured. When measuring the voltage higher than 60V (DC) or 30V (AC), keep your fingers behind
the finger guard ring of the test leads to prevent electric shock.
Do not operate the product if you suspect it is faulty, and please contact UNI-T authorized service
personnel for inspection. To avoid injury and damage, only trained personnel can perform the
maintenance program.
Never touch exposed joints and components after connecting the power supply.
Please do not operate the product when the instrument box opens. Do not change the internal circuit
of the meter.
Only use fuse that appointed to this product.
Use appropriate overvoltage protection to ensure that there is no overvoltage (like caused by lightning),
otherwise it may cause electric shock.
Do not use or store the meter in high temperature, high humidity, flammable, explosive and strong
magnetic field environments.
Before measuring resistance, continuity, diode and capacitors, please disconnect the power and fully
discharge all high-voltage capacitors.

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Limit Protection of Input Terminal:
1) Main input terminal HI and LO
The input terminals HI and LO apply to voltage, resistance, capacitance, continuity, frequency and diode
measurements.
a. HI-LO limit protection: the HI-LO limit is maximum 1000V DC or 750V AC voltage, which can also be
expressed as maximum 1000Vpk.
b. LO-GND limit protection: the limit of input terminal LO-GND can safely float to 500Vpk. The limit of
the terminal HI-GND is maximum 1000Vpk. Therefore, the sum of floating voltage and measured
voltage shall less than 1000Vpk.
2) Sampling terminals Sense HI and LO sense
Terminal Sense HI and LO sense are used for 4-wire resistance measurement.
a. The limit protection of Sense HI-LO sense is 200Vpk.
b. The limit protection of LO sense-LO is 2Vpk.
3) Current input terminals mA and A
a. The terminal mA and terminal LO are used for current measurement below 200mA. The fuse on rear
panel provides a maximum current limit protection 250mA for mA terminal.
b. The terminal A and terminal LO are used for current measurement from 200mA to 10A. The fuse on
rear panel provides a maximum current limit protection 10A for terminal A.
Note: the voltage of the current input terminal is similar to that of terminal LO. To maintain good
protection, only the specified type and class fuses can be replaced.
IEC Measurement Category II Overvoltage Protection
To avoid shock hazards, UT8805E provides overvoltage protection for mains connections that meet both
conditions below.
1. The input terminals HI and LO are connected to the mains under the measurement class II condition
(described below).
2. The maximum voltage of the mains is 300V AC.
WARNING: IEC measurement category II includes electrical devices connected to mains by a socket on
a branch circuit, such as most small appliances and measuring instruments. UT8805E can apply to make
following measurements: input terminals HI and LO are connected to the mains of IEC measurement
category IIdevices (maximum 300V AC) or are connected to branch outlets. However, the input terminals
HI and LO cannot be connected to the mains of permanently installed electrical device, such as the
distributor of main circuit breaker, the cut-out box of sub-distributor, or the permanently connected motor,
because these devices and circuits are prone to be overvoltage.
CAUTION: voltages above 300V AC can only be measured in circuits that disconnected from the mains.
However, transient overvoltage also exists in this kind of circuits. UT8805E can safely withstand
accidental transient overvoltage up to 2500Vpk. Do not use the device to measure circuits if the transient
overvoltage may exceed this range.

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Safety Terms and Symbols
Terms in the manual --- Following terms may appear in this manual:
Warning: a Warning specifies conditions and actions that may pose hazards to the user.
Caution: a Caution identifies conditions and actions that may cause damage to the product or other
properties.
The CAT I (1000V)
IEC measurement category I. The maximum measurable voltage at terminal HI-LO is 1000Vpk
The CAT II (300V)
IEC measurement category II. In the case of class II overvoltage, the input may be connected to the
mains (up to 300V AC)
Terms on the product --- Following terms may show on the product:
DANGER indicates any injury hazard immediately accessible as you read the marking.
WARNING indicates any injury hazard not immediately accessible as you read the marking.
CAUTION indicates any damage may happen to the product or other properties
Symbols on the product --- Following symbols may show on the product:
Caution, possibility of electric shock
Warning or Caution
Protective conductor terminal
Ground terminal for chassis
Earth (ground) terminal

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Overview
UT8805E is a 200000 count benchtop digital multimeter with high precision, multi-function and full-
automatic functions of mathematical operations, capacitance, temperature and other basic
measurements.
UT8805E comes with 4.3-inch 480*272 TFT display, supports LAN, USB, RS-232C and GPIB (optional)
operations, which makes it a great laboratory instrument and a precise measurement tool for automated
test systems.
Features：
200000 count resolution
Measuring speed: 2.5/10/5k reading per second
Dual display
200mV~1000V DC voltage range
200μA~10A DC current range
True-RMS，200mV~750VAC voltage range
True-RMS，2mA~10AAC current range
200Ω~100MΩ resistance range 2-line and 4-line resistance measurement
2nF~2000μF capacitance range
20Hz~1MHz frequency range
Continuity and diode test
Temperature measurement with built-in thermocouple cold junction compensation
Various mathematic operations: maximum, minimum, average value, standard deviation, pass/fail,
dBm, dB, relative measurement, histogram, trend chart, bar chart
USB drive store data and configuration
Supports interface of USB, GPIB, RS-232C and LAN, USB-TMC, IEEE 488.2 standard, VXI11 and
SCPI language
The latest mainstream multimeter SCPI command set compatible
History data record and storage
1GB NAND FLASH storage, mass storage system and test data
Chinese & English menu and online help system
PC control software of upper computer
Supports global mains voltage

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Table of Contents
Preface----------------------------------------------------------------------------------------------------------------------------------------2
Copyright Information---------------------------------------------------------------------------------------------------------------------2
Safety Terms and Symbols-------------------------------------------------------------------------------------------------------------5
Overview--------------------------------------------------------------------------------------------------------------------------------------6
Chapter 1 Quick start---------------------------------------------------------------------------------------------------------------------9
1.1 General Checking......................................................................................................................... 9
1.2 Handle Adjustment........................................................................................................................ 9
1.3 Front Panel.................................................................................................................................. 10
1.4 Rear Panel.................................................................................................................................. 10
1.5 Power On.....................................................................................................................................11
1.6 User Interface ..............................................................................................................................11
Chapter 2 Panel Operation-----------------------------------------------------------------------------------------------------------12
2.1 Range Selection.......................................................................................................................... 12
2.2 Reading Speed Selection........................................................................................................... 14
2.3 Basic Measurements .................................................................................................................. 14
2.3.1 DC Voltage Measurement................................................................................................ 14
2.3.2 DC Current Measurement ................................................................................................ 16
2.3.3 AC Voltage Measurement................................................................................................. 17
2.3.4 AC Current Measurement................................................................................................. 18
2.3.5 2-wire/4-wire Resistance Measurement........................................................................... 19
2.3.6 Frequency Measurement.................................................................................................. 21
2.3.7 Signal Cycle Measurement............................................................................................... 22
2.3.8 Continuity Test.................................................................................................................. 23
2.3.9 Diode Measurement......................................................................................................... 24
2.3.10 Temperature Measurement ............................................................................................ 25
2.4 Relative Measurement Parameters....................................................................................... 27
2.4.1 DC Input Impedance......................................................................................................... 27
2.4.2 Short- circuit Resistance................................................................................................... 27
2.4.3 Dual Display Function....................................................................................................... 28
2.5 Auxiliary System Functions ....................................................................................................... 28
2.5.1 I/O Configuration............................................................................................................... 29
2.5.2 System Settings................................................................................................................ 30
2.5.3 Time Setting...................................................................................................................... 31
2.5.4 Firmware Upgrade............................................................................................................ 31
2.6 Samples Acquirement Setting ................................................................................................... 32
2.6.1 Auto Trigger ...................................................................................................................... 32
2.6.2 Single Trigger.................................................................................................................... 32
2.6.3 External Trigger ................................................................................................................ 33
2.7 Help System................................................................................................................................ 34
2.8 Mathematical Functions.............................................................................................................. 35
2.8.1 Statistics Operation .......................................................................................................... 36
2.8.2 Limit Operation ................................................................................................................. 37

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2.8.3 The dBm Operation.......................................................................................................... 38
2.8.4 dB Operation..................................................................................................................... 38
2.8.5 The Relative Operation..................................................................................................... 39
2.9 Display Format........................................................................................................................... 40
2.9.1 Number............................................................................................................................. 40
2.9.2 Bar Chart .......................................................................................................................... 40
2.9.3 Trend Chart....................................................................................................................... 41
2.9.4 Histogram ......................................................................................................................... 41
2.9.5 Enabled trigger ................................................................................................................. 43
2.9.6 Auto Trigger ...................................................................................................................... 43
2.9.7 Single Trigger.................................................................................................................... 43
2.9.8 Hold Measurement ........................................................................................................... 43
2.9.9 Storage Management....................................................................................................... 43
Chapter 3 Practical Cases------------------------------------------------------------------------------------------------------------------44
3.1 Readings Statistics ..................................................................................................................... 44
3.2 Elimination of Test Leads Impedance Error................................................................................ 45
3.3 DBm Measurement..................................................................................................................... 45
3.4 dB Measurement......................................................................................................................... 46
3.5 Limit Test..................................................................................................................................... 46
3.6 Hold Measurement...................................................................................................................... 47
3.7 Thermocouple Setting and Measurement .................................................................................. 47
Chapter 4 Measurement Guide--------------------------------------------------------------------------------------------------- 49
4.1 True RMS AC Measurement....................................................................................................... 49
4.2 Crest Factor Error (Non-sinusoidal Input)................................................................................... 49
4.3 Load Error (AC Voltage) ............................................................................................................. 50
Chapter 5 Trouble Shooting-----------------------------------------------------------------------------------------------------------51
Chapter 6 Appendix----------------------------------------------------------------------------------------------------------------------52
Appendix A: Accessories of UT8805E.............................................................................................. 52
Appendix B: Warranty....................................................................................................................... 52
Appendix C: Maintenance and Cleaning.......................................................................................... 52
Appendix D: Contacts....................................................................................................................... 52

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Chapter 1 Quick start
This chapteris a simple guide of preparation before using, the front/real panel and interfaces ofUT8805E
digital multimeter.
1.1 General Checking
1) Checking for any damage in transit
Keep the package if the packing carton or foamed plastic cushion is seriously damaged, until the
multimeter and accessories pass the electric and mechanical inspections. Contact distributor or local
representative office immediately if any abnormality is found.
2) Accessories checking
The accessories list is provided in appendix Aof chapter 6. User can check refer to this list. Contact
distributor or local representative office immediately if any accessory is missing or damaged.
3) Complete instrument checking
Contact distributor or local representative office immediately if any abnormal operation or
appearance damage is found.
1.2 Handle Adjustment
To adjust the handle of multimeter, please hold the handle by both sides, pull outward, and rotate it as
needed, see Figure 1-1 and 1-2.
Figure 1-1 Handle adjustment
Figure 1-2 Lying position Figure 1-3 Moving position

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1.3 Front Panel
UT8805E comes with a simple clear front panel, its controlling buttons are designed by logic and can be
easily found to make basic operation. See Figure1-4.
Figure 1-4 Front panel
[A] LCD display
[E] Measure and auxiliary function buttons
[B] USB Host interface
[F] Range selector and direction buttons
[C] Power switch
[G] Input interfaces
[D] Menu operating buttons
1.4 Rear Panel
Various interface are provided by UT8805E, includes USB Device, RS-232C, LAN, GPIB (optional) and
so on, as shown in figure:
Figure 1-5 Rear panel
[A] Current measurement fuse
[G] LAN interface
[B] Lockhole
[H]AC voltage selector
[C] VMC output
[I] RS-232C interface
[D] External trigger input
[J] Power supply interface
[E] GPIB interface
[K] Power supply fuse
[F] USB Device interface
[L] Power switch