UNI-T UT801/UT802 Bench Type Digital Multimeters

Operating Manual

Overview

The UNI-T UT801 is a 3 1/2 digit digital multimeter, while the UT802 is a 4 1/2 digit model. Both are manual range, DC/AC current type digital multimeters featuring large LCD displays with backlight, full functionality, comprehensive measurements, and overload protection. They offer conventional features including DC/AC voltage, DC/AC current, resistance, frequency, capacitance, temperature (°C), Transistor hFE, diode testing, and continuity buzzer.

This operating manual provides essential information on safety and cautions. Users are advised to read the relevant information carefully and strictly observe all Warnings and Notes.

Unpacking Inspection

Upon opening the package, inspect the contents for any missing or damaged parts. Contact your dealer if any issues are found. The package typically includes:

Operating Manual (1 piece)
Test Lead (1 pair)
Alligator Clip (1 pair)
K Type Temperature Probe (1 piece) - Suitable for temperatures under 230°C
Multi-Purpose Socket (1 piece)
Power Cord (1 piece) - For AC220V 50Hz DC9V/200mA adapter

Safety Information

This meter complies with IEC61010-1 standards, featuring pollution degree 2, overvoltage category CAT II 1000V, and double insulation. Failure to follow operating instructions may reduce protection.

Before use, inspect the meter and test leads. Do not use if damaged, if the case is removed, or if the LCD shows no reaction.
Use only identical replacement parts for damaged test leads.
Avoid touching test cables, connectors, or unused terminals during testing to prevent electric shock.
Exercise extreme caution when working with voltages exceeding 60V DC or 30Vrms AC, as there is a risk of electric shock.
Ensure the correct terminal input is selected and the rotary switch is set to the desired measuring function. If unsure of the measurement value, start with the highest range.
Do not overload voltage or current beyond the meter's specified limitations.
Avoid changing the range setting while a measurement is in progress to prevent meter damage.
Do not use or store the meter in environments with high temperature, humidity, flammable materials, or strong electromagnetic fields, as performance may degrade.
Do not alter the meter's internal circuits to avoid damage or accidents.
Replace the battery immediately when the low battery indicator `?` appears. A low battery can lead to false readings, potentially causing electric shock or personal injury.
Turn the meter off when not in use. Remove the battery if the meter will not be used for an extended period.

General Specifications

Maximum Voltage (Terminal to COM): 1000V (excluding 200mV and 250V ranges).
Input Protection: Various protection mechanisms including fuses (e.g., 250mA/250V auto-recovery fuse for μA/mA, 10A/1000V fast-type fuse for 10A) and PTC resistors are employed for different measurement ranges (Resistance, Capacitance, Frequency, Temperature, hFE).
Display: LCD with full function signal display and backlight. Maximum reading is 1999 for UT801 and 19999 for UT802. Updates 2-3 times per second.
Range: Manual
Polarity Display: Auto
Overload Indication: `1`
Battery Deficiency Indicator: `?`
Operating Temperature: 0°C to 40°C (32°F to 104°F).
Storing Temperature: -10°C to 50°C (14°F to 122°F).
Relative Humidity: ≤75% for 0-30°C; ≤50% for 30-40°C.
Electromagnetic Field: Accuracy may be affected by radiated radio-frequency fields above 1V/m.
Power: Can be powered by an AC external power adapter (AC220V/DC9V-200mA) or internal batteries (2 x R14 1.5V).
Product Size: (300x245x105)mm.
Product Net Weight: Approximately 1500g (without accessories).
Safety Compliance: IEC 61010: CAT II 1000V.

LCD Display Indicators

The LCD display features several indicators:

`⚙️` Manual Range Indicator
`⚠️` Warning Signal Indicator
`?` Battery Low Indicator
`⚡️⚡️` High Voltage Signal Indicator
`-` Negative Reading Display
`~` AC Voltage or Current Indicator (DC measurements do not display a specific AC indicator)
`✋` Data Hold Active
`⚡️` Diode Test Indicator
`?` Continuity Buzzer On Indicator
Number: Displays the current measurement reading.

Units of Measurement:

Voltage: mV, V
Current: µA, mA, A
Resistance: Ω, kΩ, MΩ
Capacitance: nF, µF
Frequency: kHz
Temperature: °C
Triode Enlargement Factor: β (Times)

Functions and Terminals

Symbol	Terminal Input	Explanation
V	V, COM	DC Voltage Measurement
V	V, COM	AC Voltage Measurement
Ω	V, COM	Resistance Measurement
	V, COM	Diode / Continuity Buzzer Measurement
kHz	V, COM	Frequency Measurement
A	mA, µA → COM	DC Current Measurement
10A	10A COM	DC Current Measurement
A~	mA, µA → COM	AC Current Measurement
10A	10A COM	AC Current Measurement
F	V, mA, µA	Capacitance Measurement (Use Multi-Purpose Socket)
°C	V, mA, µA	Temperature Measurement (Use Multi-Purpose Socket)
hFE	V, mA, µA	Triode Enlargement Factor Measurement (Use Multi-Purpose Socket)

Functional Buttons

LIGHT: Powers the meter on/off. Also controls the display backlight, which turns on for approximately 10 seconds when powered by battery before auto-shutting off.
HOLD: Press to enter or exit the data hold mode. The meter beeps to confirm when hold mode is active.

Operational Measurement Guide

Refer to Diagram 1, 2, and 3 for detailed operational measurement guides.

Diagram 1 Description

Diagram 1 illustrates the connection setup for measuring Resistance (Ω), Diode/Continuity (⚡️/?), Frequency (kHz), Capacitance (F), Temperature (°C), and Transistor hFE (β). It shows the multimeter's terminals (VΩHz, COM, mAµA, 10A) and the appropriate sockets or inputs required for each measurement type.

Diagram 2 Description

Diagram 2 depicts the correct connections for performing DC/AC Voltage and DC/AC Current measurements. It highlights the use of the VΩHz and COM terminals for voltage measurements and the mAµA or 10A terminals for current measurements, emphasizing that current measurements require the meter to be connected in series with the circuit.

Diagram 3 Description

Diagram 3 provides a closer view of the test lead connections for AC voltage and current measurements, reinforcing the correct terminal usage.

Accuracy Specifications

Accuracy is specified as ±(% reading + digits) and is guaranteed for one year under operating conditions of 18°C to 28°C and relative humidity below 75%. Detailed accuracy specifications are provided for various measurements, including:

DC Voltage: Ranges from 2V to 1000V.
AC Voltage: Ranges from 2V to 1000V, with an input impedance of approximately 10MΩ for UT801 and 2MΩ for UT802 (ACV input). The frequency range for AC measurements is 45Hz to 400Hz.
DC Current: Ranges from 2mA to 10A. Note: For currents of 5A or higher, continuous measurement is limited to 10 seconds with intervals of at least 15 minutes.
AC Current: Ranges from 2mA to 10A, with a frequency range of 45Hz to 400Hz. Similar to DC current, measurements at 5A or higher are limited to 10-second bursts with 15-minute intervals.
Resistance: Ranges from 200Ω to 20MΩ. Measurements above 100MΩ are for reference. For low resistance measurements, lead resistance compensation may be necessary for accuracy.
Capacitance: Ranges from 20nF to 200µF. Values above 40µF are for reference.
Frequency: Ranges from 2kHz to 200kHz, with specified input amplitude requirements for each range.
Temperature: Measures from -40°C to 1000°C using a K-type thermocouple.
Diode Test: Features an open circuit voltage of approximately 3V, with a normal silicon junction drop between 0.5V and 0.8V.
Continuity Test: Has an open circuit voltage of approximately 3V. The buzzer activates continuously if the resistance is 100Ω or less.
Transistor hFE: Tests transistor gain under specific conditions (Ibo ≈ 10µA, Vce ≈ 2.5V).

Replacing the Battery

Diagram 4 provides instructions for replacing the meter's battery. It indicates the battery compartment location and specifies the use of 2 x R14 1.5V batteries.

Manufacturing Information

This document originates from UN-TREND TECHNOLOGY (CHINA) CO., LTD., located at Songshan Lake National High-Tech Industrial Development Zone, Dongguan City, Guangdong Province, China. The product's Part NO. is 110401104405X, and the models covered are UT801 and UT802.

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