UNI-T UT805 Operating Manual

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Model UT805

OPERATING MANUAL

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TABLE OF CONTENTS TITLE PAGE

3 4 5 5 7 8 8 10 11 14 18 18 20 22 24 27 29 31 33 35 36 37 38 39 39 41 41

Model UT805: OPERATING MANUAL

Overview Unpacking Inspection Safety Information Rules For Safe Operation International Electrical Symbols The Meter Structure A. Front Panel B. Rear Panel Functional Buttons Display Symbols Measurement Operation A. DC Voltage Measurement B. AC Voltage Measurement C. DC or AC Current Measurement D. Measuring Resistance E. Testing Diodes F. Testing for Continuity G. Capacitance Measurement H. Frequency Measurement Selecting a Measurement Range (

, AUTO and Button) The Use of Relative Value Mode MAX MIN Mode The Use of STO and RCL Button Operation of Hold Mode General Specifications Accuracy Specifications A. DC Voltage

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TITLE PAGE

42 43 44 45 46 46 47 48 49 49 50 51 51 52 52 52 53 54 54 55 57 57 58 58 58 58 61 61 61

Model UT805: OPERATING MANUAL

B. AC Voltage C. DC Current D. AC Current E. Resistance F. Diode Test G. Continuity Test H. Capacitance I. Frequency Calibration Procedure A. DC Voltage B. AC Voltage C. DC Current D. AC Current E. Resistance F. AC Voltage with DC deviation (AC+DC) G. AC Current with DC deviation (AC+DC) Summary of error codes Maintenance A. General Service B. Replacing the Fuses RS232C and USB Serial Port System Requirements for Installing the UT805 Interface Program RS232C Serial Port A. Connecting between the Meter and computer B. RS232C Port Cable C. Setting of RS232C Serial Ports USB Serial Port A. Connecting between the Meter and computer B. Setting of USB Serial Ports

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Model UT805: OPERATING MANUAL

Overview

This Operating Manual covers information on safety and cautions. Please read the relevant information carefully and observe all the Warnings and Notes strictly .

Warning To avoid electric shock or personal injury, read the “Safety Information” and “Rules for Safety Operation” carefully before using the Meter.

Model UT805 is a kind of 5 1/2 digit, vacuum-fluorescent, dual display bench-type true RMS Multimeter (hereafter referred to as “the Meter”). The Meter’s circuit design is the combination of large scale integrated simulation and digital circuit, taking microcomputer technology with 24 counts A/D converter as a core, highly precise amplifier, True RMS’s AC converter and full electronic calibration technique to make it as a reliable and accurate Multimeter.

In addition to all the conventional features including DC/AC voltage, current, resistance, diode, continuity test, capacitance, frequency, there is a recall function. RS232C and USB standard serial port for easy connection with computer to realize macro recording and monitoring and capture of transient dynamic data, displaying change of waveform during the measurement, providing data and evidence to engineering technicians for scientific research.

This is also a highly applied digital multimeter of good performance with full overload protection. This Meter uses AC power to make it becoming a better electrical equipment.

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Item Description Qty

Model UT805: OPERATING MANUAL

Unpacking Inspection

Carefully remove the Meter from its shipping container and check the following items carefully to see any missing or damaged part:

In the event you find any missing or damage, please contact your dealer immediately.

1 2 3 4 5 6 7 8

Operating Manual Test Lead Alligator Clip Multi-Purpose Socket Line Cord (AC220V~50Hz, 15W or AC110V~50Hz, 15W) RS232C Interface Cable USB Interface Cable Installation Guide & Computer Interface Software (CD-ROM)

1 piece 1 pair 1 pair 1 piece 1 piece 1 piece 1 piece 1 piece

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Model UT805: OPERATING MANUAL

Safety Information

This Meter complies with the standards IEC61010: in pollution degree 2, overvoltage category (CAT. I 1000V, CAT II 600V) and double insulation.

CAT. III: Distribution level, fixed installation, with smaller transient overvoltage than CAT. IV. CAT IV: Primary supply level, overhead lines, cable systems etc.

Use the Meter only as specified in this operating manual, otherwise the protection provided by the Meter may be impaired.

In this manual, a Warning identifies conditions and actions that pose hazards to the user, or may damage the Meter or the equipment under test.

A Note identifies the information that user should pay attention on.

International electrical symbols used on the Meter and in this Operating Manual are explained on page 7.

Rules For Safe Operation

Warning To avoid possible electric shock or personal injury, and to avoid possible damage to the Meter or to the equipment under test, adhere to the following rules:

Before using the Meter inspect the case. Do not use the Meter if it is damaged or the case (or part of the case) is removed. Look for cracks or missing plastic. Pay attention to the insulation around the connectors. Inspect the test leads and power cord for damaged insulation or exposed metal. Check the test leads for continuity. Replace damaged test leads and power cord with identical model number or electrical specifications before using the Meter. Inspect the VFD display for no display.. Do not apply more than the rated voltage, as marked on the Meter, between the terminals or between any terminal and grounding.

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Model UT805: OPERATING MANUAL

Ensure the Meter is at right measurement position range. Disconnect the connection between the test lead and the circuit under tested before changing over the range. No changeover of range shall be made during measurement is conducted to prevent damage of the Meter. When the Meter working at an effective voltage over 60V in DC or 30V in AC, special care should be taken for there is danger of electric shock. Use the proper terminals, function, and range for your measurements. Under the manual ranging mode, if the value to be measured is unknown, use the maximum measurement position and reduce the range step by step until a satisfactory reading is obtained. Do not use or store the Meter in an environment of high temperature, humidity, explosive, inflammable and strong magnetic field. The performance of the Meter may deteriorate after dampened. When using the test leads, keep your fingers behind the finger guards.

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Disconnect circuit power and discharge all highvoltage capacitors before testing on-line resistance, continuity, diodes, current, or capacitance. Before measuring current, check the Meter’s fuses and turn off power to the circuit before connecting the Meter to the circuit. Remove test leads, RS232C interface cable, USB interface cable and alligator clip from the Meter and turn the Meter power off before opening the Meter case. When servicing the Meter, use only the same model number or identical electrical specifications replacement parts. The internal circuit of the Meter shall not be altered at will to avoid damage of the Meter and any accident. Soft cloth and mild detergent should be used to clean the surface of the Meter when servicing. No abrasive and solvent should be used to prevent the surface of the Meter from corrosion, damage and accident. The Meter is suitable for indoor use. Turn the Meter power off when it is not in use.

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Model UT805: OPERATING MANUAL

International Electrical Symbols

AC or DC Grounding Double Insulated Warning. Refer to the Operating Manual High Voltage Continuity Test Diode Capacitance Test Fuse Conforms to Standards of European Union

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Model UT805: OPERATING MANUAL

1 2 3 4

789101112

The Meter Structure

A. Front Panel (see figure 1)

VFD Display Primary Functional Buttons: Different key functions selection. COM Input Terminal: Negative input terminal, inserting the black test lead. V/ Input T erminal: Positive input terminal for voltage and resistance measurement, inserting the red test lead. 200mA MAX Input Terminal: Positive input terminal for mA measurement, inserting the red test lead.

6. 10A MAX Input Terminal: Positive input terminal for A measurement, inserting the red test lead.

Input Terminal: Positive input terminal for capacitance, frequency, diode and continuity measurement, inserting the red test lead. 2mA and 200mA Buttons: mA and A measurement selection AC+DC Button: The measurement of AC voltage or current with DC deviation.

(figure 1)

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10.

11.

12.

Model UT805: OPERATING MANUAL

CAL Button: Calibrate the accuracy of Voltage,

Current and Resistance Secondary Functional Buttons: Different side functions selection. RANGE Button ( , AUTO and ): Select Auto or Manual ranging

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1 2 3 4 5

678

B. Rear Panel (see figure 2)

HI Input Terminal: 4-wire configuration to measure resistance: high current terminal, inserting red test lead. LO Input Terminal 4-wire configuration to measure resistance: low current terminal, inserting black test lead. HI Input Terminal 4-wire configuration to measure resistance, high current terminal, inserting red test lead. LO Input Terminal 4-wire configuration to measure resistance, low current terminal, inserting black test lead Power: The on off switch of AC220V~50Hz, 15W or AC110V~50Hz, 15W power supplier. “I” means power up while “O” means power off. Power-Line Cord Connector: Plug the AC220V ~50Hz,15W or AC110V~50Hz, 15W line cord USB Interface Connector RS232C Interface Connector

(figure 2)

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Model UT805: OPERATING MANUAL

Functional Buttons

The pushbuttons on the front panel select the Meter functions and operations. Below table indicated for information about the functional button operations.

Button

, AUTO and

Button)

Switching between auto and manual ranging, step through the ranges when the Meter is at manual ranging measurement mode. Continuity Test Diode Test Frequency Test Capacitance Test Resistance Measurement:

AC Voltage Measurement, displaying True RMS value DC Voltage Measurement AC Current Measurement, displaying True RMS value

Operation Performed

Press to enter resistance measurement mode. Use the front input terminals for 2 wire measurement and the back input terminals for 4 wire measurement.

ACV DCV

ACI

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Model UT805: OPERATING MANUAL

Button

AC Current Measurement

It is used to measure AC Voltage or Current with DC deviation:

It is a calibration button:

Press REL to enter and exit REL mode.: Press MAX MIN to select the maximum and minimum value.

Operation Performed

DCI

2mA &

200mA

AC+DC

CAL

REL

Press 2mA down to select 2mA current measurement range. Press 200mA down to select 200mA current measurement range. Press both 2mA and 200mA down is a mis-operation, the Meter displays “ --Err 1-“. When both 2mA and 200mA are not pressed down, 10A range is default when measuring current.

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lt can only be used at AC Voltage or AC Current measurement mode otherwise the Meter displays “--Err1-“, then back to the previous measurement range.

Press it to calibrate ACV, DCV, ACI, DCI, ACV and DCV with DC deviation, and resistance. Details refer to page 52 of this operating manual.

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Model UT805: OPERATING MANUAL

MAX MIN

STO and

RCL

HOLD

Button

Press MAX MIN to select the maximum and minimum value.

HOLD has two features:

1. Data Holding

2. Exit STO, RCL and MAX MIN mode.

Operation Performed

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Press STO to store the reading. Press RCL to recall the stored reading.

Press HOLD to enter Hold mode, the VFD display Press HOLD again to exit Hold mode, the disappear.

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Press HOLD to exit STO, RCL and MAX MIN mode when the Meter is at STO, RCL and MAX MIN measurement mode.

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1 2 3 4 5 6 7 8 9 10 11

121314151617181920

STO RCL

AUTO

HOLD

AC+DC TrueRMS MAX MIN AVG

kHz

mVAnF

MK WHz

Display Symbols (see figure 3)

(figure 3)

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Model UT805: OPERATING MANUAL

Number Symbol Meaning

Indicator for high voltage Data hold is active Indicator for AC voltage or current Indicator for AC AC Voltage or Current with DC deviation measurement Indicator for True RMS value of AC measurement Display of maximum value Display of minimum value Display of average value Test of diode Secondary Display The unit of frequency in cycles/second: µS: Microsecond mS: Millisecond

AC+DC

True RMS

MAX

MIN

AVG

Smaller digits

µS

1 2 3 4 5 6 7 8

9 10 11

HOLD

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Model UT805: OPERATING MANUAL

Number Symbol Meaning

12 13

kHz

nF µF

The unit of frequency of AC measurement: Kilohertz (shown in the secondary display) The unit of capacitance nF : Nanofarad µF : Microfarad mF : Millifarad

A : Amperes (amps). The unit of current. mA : Milliamp V : Volts. The unit of voltage. mV : Millivolt.

: Ohm. The unit of resistance. k : kilohm. M : Megaohm.

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Number Symbol Meaning

14 15 16 17 18 19 20

Relative mode is on The continuity buzzer is on. Primary Display Indicates negative reading. Reading storage is on Reading recalling is on Auto ranging mode indicator

Larger digits

STO RCL

AUTO

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To measure DC voltage, connect the Meter as follows:

Model UT805: OPERATING MANUAL

COM

DCV

Measurement Operation

If you have not done so, plug the line cord into the connector on the rear of the Meter.

A. DC Voltage Measurement (See figure 4)

Warning To avoid harms to you or damages to the Meter from electric shock, please do not attempt to measure voltages higher than 1000V or 750V rms although readings may be obtained.

Insert the red test lead into the V/ terminal and the black test lead into the COM terminal. Press the DCV button. Auto ranging is default, the Meter will select the appropriate range, and an annunciator on the display will indicate measurement units. Or you could select the manual ranging mode according to the “Selecting a Measurement Range ( , AUTO and Button)” section.

(figure 4)

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Note

When the Meter is not zero in manual range mode, you could short circuit the test lead and press REL to zeroing to increase the accuracy. When DC voltage measurement has been completed, disconnect the connection between the testing leads and the circuit under test, and remove the testing leads away from the input terminals of the Meter.

Connect the test leads across with the object being measured as shown in figure 4. The measured value shows on the primary display and the secondary display shows the measuring range. The sampling rate is around 2 times per second.

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To measure AC voltage, connect the Meter as follows:

Model UT805: OPERATING MANUAL

ACV

COM

B. AC Voltage Measurement (See figure 5)

Warning To avoid harms to you or damages to the Meter from electric shock, please do not attempt to measure voltages higher than 1000V or 750V rms although readings may be obtained. Take extra care when measuring high voltage to avoid electric shock.

Insert the red test lead into the V/ terminal and the black test lead into the COM terminal. Press ACV button, the Meter is ready for measurement after around 8 seconds. Auto ranging is default, the Meter will select the appropriate range, and an annunciator on the display will indicate measurement unit. Or you could select the manual ranging mode according to the “Selecting a Measurement Range ( , AUTO and Button)” section.

(figure 5)

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Note

When the input terminal is short circuit, it is allowed to have maximum 500 digits of reading which does not affect the accuracy. When the Meter is at auto ranging mode, the True RMS transducer needs a longer time to stablize and it requires to process AC signal frequency measurement. Therefore it takes a longer time to obtain a stable reading when changing from one reading to a relatively large reading.

Connect the test leads across with the object being measured as shown in figure 5. The primary display shows the True RMS AC value, the effective reading is only applicable to the range of 10%~100%. The measured signal frequency value shows on the secondary display. The sampling rate is around 1 time per second. To measure AC signal with DC deviation, first press ACV button, then press AC+DC button. Otherwise, the primary display shows “--Err 1-“, then back to the present measurement range.

When DC voltage measurement has been completed, disconnect the connection between the testing leads and the circuit under test, and remove the testing leads away from the input terminals of the Meter.

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To measure current, connect the Meter as follows:

Model UT805: OPERATING MANUAL

COM

DCI

COM

ACI

C. DC or AC Current Measurement (see figure 6)

Warning If the fuse burns out during measurement, the Meter may be damaged or the operator himself may be hurt. Use proper terminals, function, and range for the measurement. When the testing leads are connected to the current terminals, do not parallel them across any circuit.

ACI or DCI measurement do not have auto ranging

measurement mode. Press ACI or DCI button only to select 10A measurement range. Insert the red test lead into the 10A MAX terminal and black test lead into the COM terminal. OR Press ACI or DCI button, then press 2mA button to select 2mA measurement range. Insert the red test lead into the 200mA MAX terminal and black test lead into the COM terminal. OR

(figure 6)

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Model UT805: OPERATING MANUAL

Note

If the value of current to be measured is unknown, use the maximum measurement position, and reduce the range step by step until a satisfactory reading is obtained. For safety sake, each measurement time of high current (>5A) should be less than 10 seconds and the interval time between 2 measurements should be greater than 15 minutes. When the input of AC current measurement is open circuit, it is allowed to have less than 500 digits of reading which does not affect the accuracy. The AC current True RMS measurement takes a longer time to stablize, and the Meter requires to measure the frequency of AC current. Therefore it is normal to take a longer time to obtain a stable reading when changing from one reading to a relatively large reading. When current measurement has been completed, disconnect the connection between the testing leads and the circuit under test, and remove the testing leads away from the input terminals of the Meter.

Press ACI or DCI button, then press 200mA button to select 200mA measurement range. Insert the red test lead into the 200mA MAX terminal and black test lead into the COM terminal. It is invalid to press down both 2mA and 200mA button together.\ Connect the test lead in serial with the object being measured. The measured value shows on the primary display. The ACI effective measurement reading is only applicable to the range of 10%~100%. In the DCI measurement mode, the secondary display indicates the range. In the ACI measurement mode, the secondary display indicates the frequency value of the measured signal. To measure AC current with DC deviation, first press ACI button, then press AC+DC button. Otherwise, the primary display shows “--Err 1-“, then back to the present measurement range.

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Model UT805: OPERATING MANUAL

Warning To avoid damages to the Meter or to the devices under test, disconnect circuit power and discharge all the high-voltage capacitors before measuring resistance. To avoid harms to you, please do not attempt to input voltages higher than 60V DC or 30V AC.

D. Measuring Resistance

Insert the red test lead into the V/ terminal and the black test lead into the COM terminal at the front panel. Press the button to enter resistance measurement mode. Auto ranging is default, the Meter will select the appropriate range, and an annunciator on the display will indicate measurement units. Or you could select the manual ranging mode according to the “Selecting a Measurement Range ( , AUTO and Button)” section.

Two wire configuration measure resistance, connect the Meter as follows: (see figure 7)

(figure 7)

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Model UT805: OPERATING MANUAL

To obtain more accurate readings, you could shortcircuit the test lead and press REL to display “0” before carrying out measurement Connect the test leads across with the object. The measured value shows on the primary display and the measuring range shows on the secondary display.

Four wire configuration measure resistance, connect the Meter as follows: (see figure 8)

Use 2 sets of test lead and insert them into the rear panel of the Meter. Insert two red test leads into the two red terminals at the rear panel. Insert two black test leads into the two black terminals at the rear panel Short circuit the four test laads and press REL to display “0”. Connect the test leads across with the object. The measured value shows on the primary display and the measuring range shows on the secondary display. Four wire configuration measuring resistance can eliminate the influence of the test lead internal resistance, it is suitable for testing small resistance.

(figure 8)

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Model UT805: OPERATING MANUAL

Note

When measuring high resistance (>1M ), it is normal to take several seconds to obtain a stable reading. In order to obtain stable reading, choose shorter test lead to carrying out measurement. The LCD displays OL indicating open-circuit for the tested resistor or the resistor value is higher than the maximum range of the Meter. When resistance measurement has been completed, disconnect the connection between the testing leads and the circuit under test, and remove the testing leads away from the input terminals of the Meter.

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Model UT805: OPERATING MANUAL

COM

E. Testing Diodes (See figure 9)

Warning To avoid possible damage to the Meter and to the device under test, disconnect circuit power and discharge all high-voltage capacitors before testing diodes. To avoid harms to you, please do not attempt to input voltages higher than 60V DC or 30V AC.

Use the diode test to check diodes, transistors, and other semiconductor devices. The diode test sends a current through the semiconductor junction, and then measures the voltage drop across the junction. A good silicon junction drops between 0.5V and 0.8V.

To test a diode out of a circuit, connect the Meter as follows:

Insert the red test lead into terminal and the black test lead into the COM terminal. Press button to enter diode measurement mode. For forward voltage drop readings on any semiconductor component, place the red test lead

(figure 9)

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Model UT805: OPERATING MANUAL

on the component’s anode and place the black test lead on the component’s cathode. The measured value shows on the primary display and the secondary display shows 6.000V range.

Note

Connect the test leads to the proper terminals as said above to avoid error display. The primary display shows OL indicating diode being tested is open or polarity is reversed. The unit of diode is Volt (V), displaying the forward voltage drop readings. Open circuit voltage is around 2.8V. When diode testing has been completed, disconnect the connection between the testing leads and the circuit under test, and remove the testing leads away from the input terminals of the Meter.

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To test for continuity, connect the Meter as below:

Model UT805: OPERATING MANUAL

COM

F. Testing for Continuity (See figure 10)

Warning

To avoid damages to the Meter or to the devices under test, disconnect circuit power and discharge all the high-voltage capacitors before testing for continuity.

To avoid harms to you, please do not attempt to input voltages higher than 60V DC or 30V AC.

Insert the red test lead into the terminal and the black test lead into the COM terminal. Press button to enter continuity measurement mode. Connect the test lead across with the object being measured. The buzzer sounds if the resistance of a circuit under test is < 25 , the circuit is in good condition. The primary display shows the reading of the tested resistor and the secondary displays shows 600.0 range.

(figure 10)

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Model UT805: OPERATING MANUAL

Note

Open circuit voltage around 1.2V. The primary display shows OL indicating the tested circuit is open. When continuity testing has been completed, disconnect the connection between the testing leads and the circuit under test, and remove the testing leads away from the input terminals of the Meter.

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To measure capacitance, connect the Meter as follows:

Model UT805: OPERATING MANUAL

COM

G. Capacitance Measurement (See figure 11)

Warning

To avoid damage to the Meter or to the equipment under test, disconnect circuit power and discharge all high-voltage capacitors before measuring capacitance. Use the DC Voltage function to confirm that the capacitor is discharged.

To avoid harms to you, please do not attempt to input voltages higher than 60V DC or 30V AC.

Insert the red test lead into the terminal and the black test lead into the COM terminal. Press button to select capacitance measurement mode. Auto ranging is default. Connect the test lead across with the object being measured. For the capacitor lead is less than 0.6mm, It is recommended to use the multi-purpose socket to proceed the measurement as the above figure 11. It is more suitable for testing small capacitor, it can reduce the influence of distributed capacitor,

(figure 11)

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Model UT805: OPERATING MANUAL

Note

If the tested capacitance has polarity, connect the red test lead to the capacitor’s positive and the black test lead to the capacitor’s negative. When the Meter is in open circuit and manual ranging mode, press REL to display “0”. In the manual range mode, press to up range or down range to the desired range. button cannot be used It is normal to take a longer time when testing a capacitor value higher than 10 F. The Meter display shows OL indicating the tested capacitor is shorted or it exceeds the maximum range. When capacitance measurement has been completed, disconnect the connection between the testing leads and the circuit under test and remove the testing leads away from the input terminals of the Meter.

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The measured value shows on the primary display. The secondary display shows the measuring range

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Model UT805: OPERATING MANUAL

COM

H. Frequency Measurement (see figure 12)

Warning To avoid harms to you, please do not attempt to input voltages higher than 60V DC or 30V AC.

To measure frequency, connect the Meter as follows:

Insert the red test lead into the terminal and the black test lead into the COM terminal. Press Hz button to select frequency measurement mode. Auto ranging is default. Connect the test leads across with the object being measured. The measured value shows on the primary display and the secondary display shows the cycle of the tested frequency.

(figure 12)

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Note

When making frequency measurement, it must comply with the following scope (a) requirement: When 10Hz ~ 1Mz : 150mV a 30V rms. When > 1Mz~ 10MHz : 300mV a 30V rms When > 10Mz~ 50MHz : 600mV a 30V rms When > 50Mz : Unspecified In the manual range mode, press to up range or down range to the desired range. button cannot be used When frequency measurement has been completed, disconnect the connection between the testing leads and the circuit under test, and remove the testing leads away from the input terminals of the Meter.

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Model UT805: OPERATING MANUAL

Selecting a Measurement Range ( , AUTO and Button)

The Meter is default at DC Voltage 2V auto ranging measurement mode when turning on the Meter. Measurement ranges can be selected automatically by the Meter in autorange or manually by the user. In the autorange mode, the Meter selects the appropriate range for the measurement reading.

The use of the buttons of , AUTO and :

Press or button to enter the previous range of the auto ranging measurement mode. To switch between measuring functions at manual ranging mode, the Meter will enter auto ranging mode automatically unless the measuring functions has only manual ranging mode. When you are in autoranging mode, the AUTO annunciator is lit. In manual range, the Meter remains in the selected range regardless of input. Press AUTO to toggle back to autoranging. At resistance measurement mode: Auto ranging measurement mode is default. Press AUTO to toggle in and out of the manual

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ranging mode, or press or to toggle in the manual ranging mode. In the manual range mode, press or to up range or down range to the desired range. At ACV and DCV measurement mode:\ Auto ranging measurement mode is default. Press AUTO to toggle in and out of the manual ranging mode, or press or to toggle in the manual ranging mode. In the manual range mode, press or to up range or down range to the desired range. At 200mV range, the Meter does not have auto ranging measurement mode. At capacitance and frequency measurement mode: Auto ranging measurement mode is default. Press AUTO to toggle in and out of the manual ranging mode, or press to toggle in the manual ranging mode. In the manual range mode, press to up range or down range to the desired range. cannot be used. At diode, continuity, ACI and DCI measurement mode, both and cannot be used.

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Model UT805: OPERATING MANUAL

The Use of Relative Value Mode

Relative Mode applies to all functions except continuity, diode and frequency measurements.

When the relative mode is selected, the reading on the primary display is always the difference between the relative base and the input measurement. For example, if the relative base is 15.0000V , and the present reading is 14.1000V, the display will show -00.9000.

Press REL to toggle in and out of the relative mode. When the relative mode is selected: the lsat valid reading is stored as the relative base, the primary display zeros out and display “0”, is shown on the primary display . (The secondary display is unaffected.)

Selecting the relative mode turns off autoranging and locks in the present range. Make sure you are in the correct range before selecting the relative mode. If you press or after the relative mode has been selected, you will automatically exit .

Press REL to enter REL mode, the Meter displays

, auto ranging turns off, and the present meauremnet range is locked and stored the present measurement value as the stored value, the Meter displays “0”. The present measurement value obtained later on is the difference of the stored value. Press REL again to exit REL mode. Press REL again to step the display through the above sequence.

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To enter or eixt REL mode:

AUTO cannot be pressed, otherwise “--Err 1-“ will be displayed and then back to the current meaurement range

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Model UT805: OPERATING MANUAL

MAX MIN Mode

MAX MIN mode applies only to DCV, ACV, ACV and ACI with DC deviation, and resistance. Press MAX MIN when the Meter is at other measurements mode, the Meter displays “--Err 1-“ and then back to the current measurement mode.

The MAX MIN mode causes the Meter to store minimum and maximum inputs measured since the MAX MIN was selected.

Press MAX MIN to select the MAX MIN mode. When the MAX MIN is first selected, the maximum and minijum values are set to the displayed reading and the MAX annunciator lights. Press MAX MIN again to display the minimum reading (and the MIN annunciator lights.) Each subsequent press of the MAX MIN button toggles between the maximum and minimum measurements taken. To exit MAX MIN mode, press HOLD button..

Selecting the MAX MIN mode turns off autoranging and locks in the present range. Make sure you are in the correct range before selecting the MAX MIN mode. If you press or after MAX MIN has been selected, you will automatically exit the MAX MIN mode.

Measurement speed is 100 times / second. The display flashes “OL” when the testing exceeds the measurement speed.

MAX MIN mode and REL mode cannot be used together . The Meter displays “--Err 1-“ and then back to the current measurement mode if REL is pressed under MAX MIN mode.

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Model UT805: OPERATING MANUAL

The Use of STO and RCL Button

STO Button

Press STO to step through 7 different storage speed including r=0, r=1, r=2, r=3, r=4, r=5 and r=6, they will be shown on the secondary display. r=0 means store each reading per each sampling. r=1 means store each reading per 10 times sampling r=2 means store each reading per 100 times sampling r=3 means store each reading per 500 times sampling r=4 means store each reading per 1000 times sampling r=5 means store each reading per 5000 times sampling r=6 means manual storage. You need to press STO for each reading storage. The maximum pieces of stored reading is 100. “RCL” will be flicking on the VFD when the stored value is over 100pcs. Y ou need then need to recall the reading, Press HOLD to exit STO mode.

Follow the following procedure to recall the stored reading:

1. Press HOLD to exit STO mode.

2. Press RCL to step through MAX reading, MIN reading, AVG reading, the first stored reading (n=00), the second stored reading (n=02) until the 100st stored reading (n=99) in sequence.

3. Press HOLD to exit RCL mode. When recalling the stored reading, the Meter must be at the stored reading measurement ranges, otherwise it will display “--Err 3 –“, then back to new measurement ranges.When the Meter is at STO mode, pressing RCL two times to display through MAX reading, MIN reading, AVG reading and the present measurement reading in sequence. Reading storage is unaffected.

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Model UT805: OPERATING MANUAL

Operation of Hold Mode

The Hold mode allows you to take a measurement and hold that measurement on the display. This feature can be particularly advantageous in difficult or hazardous circumstances when you might want to keep your eyes fixed on the probes, and then read the display when it is safe or convenient to do so. When a new, stable reading is detected, the display is automatically updated.

Press HOLD to select Hold mode. When hold mode is selected, is shown in the primary display. The current reading on the display is hold. To exit hold mode, press HOLD again, will be disappeared.

You can also press HOLD to exit STO, RCL and MAX MIN mode when the Meter is at STO, RCL and MAX MIN measurement mode.

General Specifications

Maximum Voltage between any Terminals and Grounding: Refer to different range input protection voltage.

Fused Protection for 200mA Input Terminal:

315mA, 250V, fast type, 5x20mm.

Fused Protection for 10A Input Terminal:

10A, 250V, fast type, 5x20mm.

Fused Protection for AC220V Terminal:

315mA, 250V, fast type,

5x20mm. Maximum Display: Main LCD Display : 220000, Small LCD Display: 9999, VFD Measuring Theory:

- type, A/D converter Measurement Speed: Updates around 2 times/second. At max/min mode, updates 100 times/second Range: Manual or auto ranging.

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Model UT805: OPERATING MANUAL

Icon Display: Equipped with functions and electrical unit symbol icon display. Polarity Display: Auto Overloading Display: OL Temperature: Operating: 00C to +400C (320F to +1040F). Storage : -100C to +500C (140F to +1220F). Relative Humidity:

75% @ 00C - 300C below; 50% @ 300C - 400C. Altitude: Operating: 2000 m. Storage : 10000 m.

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Power: AC220V~50Hz, 15W or AC110V~50Hz, 15W Dimensions (HxWxL): 240 x 105 x 370 mm. Weight: Approximate 2.9kg (accessories: 0.4kg).

Safety/Compliances: IEC61010 CAT.I 1000V, CAT.II 600V overvoltage and double insulation standard. Certifications: UL pending.

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Model UT805: OPERATING MANUAL

Accuracy Specifications

Accuracy: (a% reading + b digits), guarantee for 1 year. Operating temperature: 230C 50C. Relative humidity: not more than 75% RH. Temperature coefficient: 0.1 x (specified accuracy)/10C.

A. DC Voltage

Remarks:

Overload Protection: 1000V DC or 750V AC Input Impedance:

At 200mV and 2V ranges: more than 500M At 20V, 200V and 1000V ranges: Around 10M

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Range Measurement Scope Resolution Accuracy

200mV

20V

200V

1000V

1 V~220.000mV

10 V~2.20000V

100 V~22.0000V

1mV~220.000V

10mV~1000.00V

1 V

10 V

100 V

1mV

10mV

In REL mode:

(0.006%+2)

(0.007%+2)

Note

UT805 multimeter is a precise digital multimeter when you turn on the UT805 allow a warm-up period of at least 30 minutes for the internal components to stabilize this ensures that the multimeter accord with the specification

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Model UT805: OPERATING MANUAL

B. AC Voltage (True RMS)

Remarks:

Overload Protection: 1000V DC or 750V AC Input Impedance:10M AC+DC Tolerance Limit: Same as AC + 1% Displays:

The effective reading is only applicable to the range of 10%~100%. The full range of each measurement range displays 220000 except at AC750V measurement range.

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Range Resolution

Accuracy

40Hz~10kHz >10~30kHz >30~50kHz >50~100kHz

(0.5%+300)

(2%+500)

N/A

(0.3%+200)

(1%+500)

N/A

(0.2%+200)

(0.3%+200)

>1kHz-5kHz:

(0.4%+100)

(0.1%+100)

(0.2%+100)

40Hz-1kHz:

(0.3%+100)

1 V

10 V

100 V

1mV

10mV

200mV

20V

200V

750V

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Model UT805: OPERATING MANUAL

Range Measurement Scope Resolution Accuracy

C. DC Current

Remarks:

Overload Protection:

At mA Range: Fuse 315mA, 250V, fast type, 5x20mm. At A Range :Fuse 10A, 250V, fast type, 5x20mm.

At 5A range :Continuous measurement is allowed. At >5A range:For continuous measurement 10 seconds and interval not less than 15 minutes.

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2mA

20mA

10A

0.01 A~2.20000mA 1 A~220.000mA

0.1mA~10.0000A

0.01 A 1 A

0.1mA

(0.03%+10)

(0.8%+60)

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Model UT805: OPERATING MANUAL

D. AC Current (Frequency range: 40Hz~5kHz)

Remarks:

Overload Protection: At mA Range:Fuse 315mA, 250V, fast type, 5x20mm. At A Range :Fuse 10A, 250V, fast type, 5x20mm. At 5A range: Continuous measurement is allowed. At >5A range: For continuous measurement 10 seconds and interval not less than 15 minutes. Displays : The effective reading is only applicable to the range of 10%~100%. AC+DC Tolerance Limit: Same as AC + 1%.

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Range Measurement Scope Resolution Accuracy

2mA

20mA

10A

0.01 A~2.20000mA 1 A~220.000mA

0.1mA~10.0000A

0.01 A 1 A

0.1mA

(0.3%+100)

(2%+200)

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Model UT805: OPERATING MANUAL

E. Resistance

Remarks:

Overload Protection : 1000V DC or 750V AC Open Circuit Voltage:Around 2V

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Range Measurement Scope Resolution Accuracy

20k

200k

20M

0.01 ~2.20000k

0.1 ~22.0000k 1 ~220.000k

10 ~2.20000M

100 ~22.0000M

0.01

0.1 1

100

In REL mode: (0.01%+8)

In REL mode:

(0.01%+5)

(0.02%+10)

(0.1%+20)

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Model UT805: OPERATING MANUAL

F. Diode Test

Range Measurement Scope Resolution Overload Protection Remarks

0.00~6.00V 10mV 250Vp

Open circuit voltage approximate 2.8V . A good silicon junction drops between

0.5V and 0.8V

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Range Measurement Scope Resolution Overload Protection Remarks

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G. Continuity Test

0~600 250Vp1

Open circuit voltage approximate -1.2V . When circuit disconnected with resistance value 50 , buzzer does not beep. When circuit is in good connection with resistance value 10 , buzzer beeps continuously.

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Model UT805: OPERATING MANUAL

H. Capacitance

Remarks:

Overload Protection: 250Vpl

Range Measurement Scope Resolution Accuracy

6nF

60nF

600nF

6 F

60 F

600 F

6mF

1pF~5.999nF

10pF~59.99nF

100pF~599.9nF

1nF~5.999 F

10nF~59.99 F

100nF~599.9 F

1 F~5.999mF

1pF

10pF

100pF

1nF

10nF

100nF

1 F

In REL mode: (2.5%+5) In REL mode: (2.0%+5)

(2.0%+5)

(5.0%+5)

Un-Specified

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Model UT805: OPERATING MANUAL

Range Measurement Scope Resolution Accuracy

I. Frequency

Remarks:

llOverload Protection: 250Vp

Input scope (a): (DC electric level is zero) When 10Hz ~ 1MHz: 150mV a 30V rms When > 1MHz ~ 10MHz: 300mV a 30V rms When > 10MHz ~ 50MHz: 600mV a 30V rms When > 50MHz: Unspecified

6kHz

60kHz

600kHz

6MHz

60MHz

1Hz~5.999kHz

10Hz~59.99kHz

100Hz~599.9kHz

1kHz~5.999MHz

10kHz~59.99MHz

1Hz

10Hz

100Hz

1kHz

10kHz

(0.1%+3)

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Model UT805: OPERATING MANUAL

A. DC Voltage (Calibrate both positive and negative

polarity)

CALIBRATION PROCEDURE

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The calibration must be done in manual ranging mode. Power-up the Meter and allow it to stabilize for one hour. The accuracy of the original source must be 1/3 better than the calibrated range

Short circuit the test lead, press REL to display “0”, input 1000V, then press CAL button. The Meter displays: (--CAL--) (-HI-END)

(1000.00V), calibration finished

1000V :

Short circuit the test lead, press REL to display “0”, input 190mV, then press CAL button. The Meter displays: (--CAL--) (-HI-END)

(190.000mV), calibration finished. Short circuit the test lead, press REL to display “0”, input 1.9V, then press CAL button. The Meter displays: (--CAL--) (-HI-END)

(1.90000V), calibration finished.

200mV:

2V :

Short circuit the test lead, press REL to display “0”, input 19V, then press CAL button. The Meter displays: (--CAL--) (-HI-END)

(19.0000V), calibration finished. Short circuit the test lead, press REL to display “0”, input 190V, then press CAL button. The Meter displays: (--CAL--) (-HI-END)

(190.000V), calibration finished

20V :

200V :

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Model UT805: OPERATING MANUAL

B. AC Voltage(750V range: frequency 1kHz, all other

ranges: frequency 20kHz)

200mV:

2V :

20V :

200V :

Input 19mV, press CAL button to display (-- CAL--) (-LO-END) ( ) Input 190mV, press CAL button to display (--CAL--)

(-HI-END) (190.000mV), calibration finished Input 190mV, press CAL button to display (--CAL--) (-LO-END) ( ) Input

1.9V, press CAL button to display (-- CAL--)

(-HI-END) (1.90000V), calibration finished. Input 1.9V, press CAL button to display (-- CAL--) (-LO-END) ( ) Input 19V, press CAL button to display (-- CAL--)

(-HI-END) (19.0000V), calibration finished. Input 19V, press CAL button to display (--CAL--) (-LO-END) ( ) Input 190V, press CAL button to display (-- CAL--)

(-HI-END) (190.000V), calibration finished.

750V :

AC+DC:

Input 190V, press CAL button to display (-- CAL--) (-LO-END) ( ) Input 750V, press CAL button to display (-- CAL--)

(-HI-END) (750.00V), calibration finished. Carry out the calibration according to each range of DC voltage.

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Model UT805: OPERATING MANUAL

C. DC Current (Calibrate both positive and negative

polarity)

2mA :

200mA :

10A :

Press REL to display “0”, input 1.9mA, press CAL button to display (--CAL--) (-HI-END) ( 1.90000mA), calibration finished. Press REL to display “0”, input 190mA, press CAL button to display (--CAL--) (-HI-END) ( 190.000mA), calibration finished Press REL to display “0”, input 10A, press CAL button to display (--CAL--) (-HI-END) ( 10.0000A), calibration finished

D. AC Current (Frequency: 1kHz)

2mA :

200mA :

10A :

AC+DC:

Input 0.19mA, Press CAL button to display (--CAL--) (-LO-END) ( ) Input

1.9mA, Press CAL button to display (--CAL--)

(-HI-END) (1.90000mA), calibration finish. Input 19mA, Press CAL button to display (--CAL--) (-LO-END) ( ) Input 190mA, Press CAL button to display (--CAL--) (-HI-END) (190.000mA), calibration finish Input 1.9A, Press CAL button to display (-- CAL--) (-LO-END) ( ) Input 10A, Press CAL button to display (-- CAL--) (-HI-END) (10.0000A), calibration finish AC+DC:Carry out the calibration according to each range of DC current.

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Model UT805: OPERATING MANUAL

E. Resistance F. AC Voltage with DC deviation (AC+DC)

1. Press ACV button

2. Press AC+DC button

3. Follow the above “B. AC Voltage” procedure

G. AC Current with DC deviation (AC+DC)

1. Press ACI button

2. Press AC+DC button

3. Follow the above “D. AC Current” procedure.

2k :

20k :

200k :

2M :

20M :

Press REL to display “0”, input 1.9k , press CAL button to display (--CAL--) (-HI-END) ( 1.90000k ), calibration finished. Press REL to display “0”, input 19k , press CAL button to display (--CAL--) (-HI-END) ( 19.0000k ), calibration finished. Press REL to display “0”, input 190k , press CAL button to display (--CAL--) (-HI-END) ( 190.000k ), calibration finished. Press REL to display “0”, input 1.9M , press CAL button to display (--CAL--) (-HI-END) ( 1.90000M ), calibration finished. Press REL to display “0”, input 19M , press CAL button to display (--CAL--) (-HI-END) ( 19.0000M ), calibration finished

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Model UT805: OPERATING MANUAL

SUMMARY OF ERROR CODES

If the Meter is failed to operate properly, an error code is displayed in the primary display. Error codes are listed in below table:

Error Code Description

Wrong button is pressed At AVG mode, the number of average times > 999998, out of range. At REL mode, the stored value > 220000, out of range. The present measurement range and the range of the stored reading is not the same when recalling the reading The tested reading is out of the calibration scope

Err1 Err2

Err3

Err4

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Model UT805: OPERATING MANUAL

Maintenance

This section provides basic maintenance information including general service and fuse replacement instruction.

Warning Do not attempt to repair or service your Meter unless you are qualified to do so and have the relevant calibration, performance test, and service information. To avoid electrical shock or damage to the Meter, do you get water inside the case.

A. General Service

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Calibrate the Meter around once a year to ensure the accuracy of each functions. Periodically wipe the case with a damp cloth and mild detergent. Do not use abrasives or solvents. To clean the terminals with cotton bar with detergent, as dirt or moisture in the terminals can affect readings. Turn off the power of the Meter when it is not in use. Do not use or store the Meter in a place of humidity, high temperature, explosive, inflammable and strong magnetic field.

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Model UT805: OPERATING MANUAL

B. Replacing the Fuses (see figure 13)

Warning To avoid electrical shock or arc blast, or personal injury or damage to the Meter, use specified fuses ONLY in accordance with the following procedure.

To replace the Meter’s fuse:

Turn the Meter off, disconnect the power cord and remove all connections from the terminals. Fuse 1:The line power fuse is in series with the power supplier. This fuse is located at the top of the power

-line cord connector on the rear panel. To replace this fuse, unplug the line cord and remove the line power fuse housing to install the replacement fuse. Fuse 2 and 3:These two fuses are located inside the fuse compartment. To replace these fuses, first unplug the line cord. Then use a coin to open the accessories compartment at the top of the front cover, then you will see a fuse compartment. Open the fuse compartment to replace fuse 2 and 3. Remove the fuse by gently prying one end loose, then take out

(figure 13)

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Model UT805: OPERATING MANUAL

the fuse from its bracket. Then install the replacement fuse. Install ONLY replacement fuses with the identical type and specification as follows and make sure the fuse is fixed firmly in the bracket. Fuse 1: 315mA, 250V , fast type, 5x20mm (AC220V) Fuse 2: 315mA, 250V, fast type, 5x20 mm (mA) Fuse 3: 10A, 250V, fast type, 5x20 mm (A)

Replacement of the fuses is seldom required. Burning of a fuse always results from improper operation.

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Model UT805: OPERATING MANUAL

RS232C and USB Serial Port

System Requirements for Installing the UT805 Interface Program

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An IBM PC or equivalent computer with 80486 or higher processor and 600 x 800 pixel or better monitor. Microsoft Windows 95 or above. At least 8MB of RAM. At least 8MB free space in hard drive. Can access to a local or a network CD-ROM. A free serial port. A mouse or other pointing device supported by Windows.

To use UT805 Interface Program, you need the following hardware and software:

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Model UT805: OPERATING MANUAL

RS232C Serial Port

A. Connecting between the Meter and computer (see figure 14)

B. RS232C Port Cable

D-sub

9 Pin Male

Computer

D-sub

9 Pin Female

D-sub

25 Pin Female

The Meter

2 (RXD) 3 (TXD) 5 (SG)

3 (TXD) 2 (RXD) 5 (SG)

2 (TXD) 3 (RXD) 7 (SG)

C. Setting of RS232C Serial Ports

Default of RS232C serial port for communication is set as: Baud Rate 19200 Start bit always 0 Stop bit always 1 Data bits 8 Parity Odd

(figure 14)

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Model UT805: OPERATING MANUAL

Serial port output 25 bits. Each bit is an alphabet, below table explains the meaning of each alphabet:

Number

1 2 3 4 5

Start

Character

S (STO) R (RCL)

D (STO+RCL)

H (HOLD

X (MAX)

N (MIN)

G (AVG)

C (Continuity)

D (Diode)

A (AC)

(AC+DC)

E (REL)

U (AUTO)

1234567

High

Voltage

+ C E

Number

1 2 3 4 5

8-14

16 17-21 22 23 24

6 Digit + dp

V A F

0 ( )

H (Hz)

4 Digit + dp k (kHz)

m (mS)

( S)

End

Character

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Model UT805: OPERATING MANUAL

The Meter adopts a single large alphabet command, each command is sent out twice as below table:

When the Meter receives the computer sent command, same large alphabet command twice, it will return the same alphabet. The Meter will not response if a wrong alphabet command is received.

Number

12345

Command

Meaning

Number

Command

Meaning

DCI

ACV

REL

HOLD

ACI

AC+DC

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Model UT805: OPERATING MANUAL

USB Serial Port

A. Connecting between the Meter and computer (see figure 15)

B. Setting of USB Serial Ports

Install the USB serial port driver according to the Installation Guide & Computer Interface Software before connecting the Meter and computer.

Check for the USB Serial port shown at the Control Panel => System => Device Manager. Make sure connect the Meter and the computer with the same port.

Please refer to the included “Installation Guide & Computer Interface Software” for installing and operating instructions of the UT805 Interface Program.

**END**

(figure 15)

TO COMPUTER

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Model UT805: OPERATING MANUAL

Manufacturer: UNI-TREND TECHNOLOGY(DONG GUAN)LIMITED Address: Dong Fang Da Dao, Bei Shan Dong Fang Industrial Development District, Hu Men Town, Dong Guan City, Guang Dong Province, China Headquarters: Uni-Trend International Limited Address: Rm901, 9/F, Nanyang Plaza 57 Hung To Road Kwun Tong Kowloon, Hong Kong Tel: (852) 2950 9168 Fax: (852) 2950 9303 Email: info@uni-trend.com http://www.uni-trend.com