Megger AVO410 Digital multimeter User Manual

Megger AVO410 Digital multimeter

SAFETY WARNINGS

Safety warnings must be read and understood before instrument is used. The following safety information must be observed to insure maximum personal safety during the operation of this meter:

• Do not use in wet environments.
• Measurements beyond the maximum selected range must not be attempted.
• Extreme care must be taken when measuring above 50 V, especially on live bus-bars.
• To measure voltage, the instrument must not be switched to a current or resistance range, or to the diode check or buzzer position.
• Circuits must be de-energised and isolated before carrying out resistance tests.
• The rotary selector switch must only be turned after removing test connections.
• To avoid false readings that could lead to electric shock and injury, replace the battery as soon as the low battery indicator ( ) appears.
• All external voltages must be disconnected from the instrument before removing the battery.
• Test leads and prods must be in good order, clean, and with no broken or cracked insulation.
• UK Safety Authorities recommend the use of fused test leads when measuring voltage on high energy systems.
• Replacement fuses must be of the correct type and rating.
• The instrument must not be used if any part of it is damaged.
• Check for correct instrument operation by testing a known voltage before and after use. Do not use if misleading results are obtained.
• Warnings and precautions must be read and understood before an instrument is used. They must be observed during the operation of this instrument.
• CAT IV – Measurement category IV: Equipment connected between the origin of the low-voltage mains supply and the distribution panel.
• CAT III – Measurement category III: Equipment connected between the distribution panel and the electrical outlets.
• CAT II – Measurement category II: Equipment connected between the electrical outlet and the user’s equipment.

End of life disposal

The crossed out wheeled bin placed on the Megger products is a reminder not to dispose of the product at the end of its product life with general waste.
Megger is registered in the UK as a Producer of Electrical and Electronic Equipment. The Registration number is WEE/HE0146QT.

Batteries

Should the display fail to illuminate then change the battery. For the purpose of end of life disposal and battery replacement, removing the two screws on the base of the unit accesses the battery. The crossed out wheeled bin placed on the battery is a reminder not to dispose of it with general waste at the end of its life.
This product contains 1 x PP3 / 6F22 alkaline battery.

Do not use rechargeable batteries.
The battery fitted in this instrument is classified as a Portable Battery and should be disposed of in the UK in accordance with Local Authority requirements.
For disposal of batteries in other parts of the EU contact your local distributor. Megger is registered in the UK as a Producer of Batteries. The registration number is BPRN00142.

Introduction

Thank you for purchasing the Megger AVO410 Digital Multimeter.
For your own safety and to get the maximum benefit from your instrument, please ensure that you read and understand the safety warnings and instructions before attempting to use the instrument.
The AVO410 is aimed at providing electricians with a rugged, easy to use multimeter for field use. Functions include voltage, current and resistance;
in addition, there are extra functions that may also appeal to electrical
and photovoltaic engineers. The instrument features automatic or manual selection of ranges, True RMS readings and a CAT IV 600 V safety rating.

Unpacking and inspection

Upon removing your new digital multimeter from its packing, you should have the following items.

1. Digital multimeter.
2. Test lead set (one black, on red)
3. User manual.
4. Protective holster.

Meter description

1. 6000 counts LCD display.
2. Push buttons for features
3. Selection switch
4. Input terminal for all other functions (Red)
5. Input terminal for A current selection (Red)
6. COM (Black) common or ground reference input terminal for all functions.

FEATURES

OPERATION

AC VOLTAGE MEASUREMENTS

1. Set the function switch to the V AC position (AUTO, T-RMS and AC volts will appear on the display).
2. Insert the black test lead in the COM jack and the red test lead into the V jack.
3. Connect the test probe tips to the circuit under test.
4. Read the voltage on the display.

DC VOLTAGE MEASUREMENTS

1. Set the function switch to the V DC position (AUTO and DC volts will be appear on the display).
2. Insert the black test lead into the COM jack and the red test lead into the V jack.
3. Connect the test probe tips to the circuit under test. Be sure to observe the correct polarity (red lead to positive, black lead to negative)
4. Read the voltage on the display. If the polarity is reversed, the display will show (-) minus before the reading.

RESISTANCE (Ω) MEASUREMENTS

1. Set the function switch to the Ω position (AUTO and MΩ will appear on the display).
2. In addition, O.L will be displayed indicating an open circuit.
3. Insert the black test lead into the COM jack and the red test lead into the Ω jack.
4. Connect the test probe tips to the circuit under test.
5. According to measured value the reading will be in Ω, kΩ or MΩ.

Note: The AVO410 provides an open circuit voltage <-1.5 V to the circuit under test which will cause transistor junctions to conduct so it is advisable to disconnect the item to be tested from the circuit to obtain an accurate reading.

DIODE / CONTINUITY TESTS

WARNING: To avoid electric shock never test a diode or conduct a continuity test on an energized circuit.

1. Set the function switch to the diode/continuity position. (The diode and V symbols will appear).
2. In addition, .OL will be displayed indicating an open circuit.
3. Insert the black test lead into the COM jack and the red test lead into the Ω jack.
4. For continuity connect the test probes to the cable or circuit to be tested. (Polarity is not important).
5. The AVO410 will emit a tone if continuity is below 500 Ω / .OL with no tone will indicate either open circuit or continuity above 500 Ω.
6. For diode testing connect the test probe tips to the diode or semiconductor junction and note the reading.
7. Reverse the probe polarity by switching probe position and note this reading.
8. The diode or junction can be evaluated as follows:
   •  If one reading shows a value and the other reading shows .OL, the diode is good.
   • If both readings show .OL, the device is open circuit.
   • If both readings are very small or zero, the device is shorted.

DCµA MEASUREMENTS (6000 µA max.)

1. Set the function switch to the DCµA position. (AUTO and DCµA will be displayed).
2. Insert the black test lead into the COM jack and the red test lead into the µA jack.
3. Remove power from circuit under test, then open circuit at a convenient point where current is to be measured.
4. Connect the black test probe to the negative side of the circuit. Connect the red test probe to the positive side of the circuit.
5. Carefully apply the power
6. Read the measured on the display.
7. Remove supply before removing test leads and reconnecting circuit.

Note: The DCµA input terminal is protected by 3.6 kΩ PTC (600 V rated) thermistors. The loading effect of these devices may cause measurement errors on low impedance circuits (<100 kΩ).

CAPACITANCE MEASUREMENTS

WARNING: To avoid damage to the instrument. Before testing, discharge the capacitor/s to be tested.

1. Set the function switch to the capacitor position (AUTO and nF will be appear on the display).
2. Insert the black test lead into the COM jack and the red test lead into the capacitance jack.
3. Connect the test probe tips to the capacitor under test. Be sure to observe the correct polarity if the capacitor is an electrolytic / polarised type. Red to positive and black to negative.
4. Read the value on the display.

FREQUENCY MEASUREMENTS

1. Set the function switch to the Hz position (AUTO and Hz will appear on the display).
2. Insert the black test lead in the COM jack and the red test lead into the Hz jack.
3. Connect the test probe tips to the circuit under test.
4. Read the frequency on the display.

AC CURRENT MEASUREMENTS

1. Set the function switch to the AC A position. (AUTO, T-RMS and AC A will appear on the display).
2. Insert the black test lead into the COM jack and the red test lead into the A jack.
3. Remove power from circuit under test, then open circuit at a convenient point where current is to be measured.
4. Connect the black test probe to the negative side of the circuit. Connect the red test probe to the positive side of the circuit.
5. Carefully apply the power
6. Read the measured on the display.
7. Remove supply before removing test leads and reconnecting circuit.
   Note: When measuring current on the A current terminal the instrument has an internal impedance of 0.01 Ω at AC/DC A in series with circuit under test.

The loading effect may cause measurement errors on low impedance circuits.
For example: Measuring a 1 Ω impedance circuit will cause a -1 % measuring error. The error percentage of the loading effect of the meter can be expressed as the following:

DC CURRENT MEASUREMENTS

1. Set the function switch to the DC A position. (AUTO and DC A will appear on the display).
2. Insert the black test lead into the COM jack and the red test lead into the A jack.
3. Remove power from circuit under test, then open circuit at a convenient point where current is to be measured.
4. Connect the black test probe to the negative side of the circuit. Connect the red test probe to the positive side of the circuit.
5. Carefully apply the power
6. Read the measured on the display.
7. Remove supply before removing test leads and reconnecting circuit.

FEATURE BUTTONS

BACKLIGHT

The AVO410 has a backlit display for all the different functions which has an auto off in 60 seconds.

MIN MAX

The MIN MAX function enables the user to display both a minimum and a maximum measured reading. To activate, first select a function and make a measurement. Press the MIN MAX button to store the maximum reading. Should the value increase then the new value will be stored. Pressing the MIN MAX button once more will switch the instrument display to minimum reading. Pressing the HOLD button while in MIN MAX mode will stop the AVO410 updating the maximum and minimum displayed reading. Holding down the MIN MAX button for >1 sec. will switch the function off.

HOLD

Press the HOLD button to freeze the reading on the display. The MIN MAX function is unavailable when the Hold is active.

RS-232

The RS232 feature on the meter has been disabled.

RANGE

When any of the individual functions are first selected the unit will be in the auto ranging mode. Each successive press of the range button will enable the operator to manually choose a required range.

AUTO POWER OFF / DISABLE

If the meter is idle for more than 10 minutes, the meter automatically turns the display off. During this off time the last reading on the meter is stored. The AVO410 can be restored by pressing any button. To disable the power off function simultaneously hold down the MIN MAX, RS232 and Range buttons and switch instrument to required function.

MAINTENANCE

To clean the instrument, do not immerse in water, periodically wipe the case with a damp cloth and mild detergent. Dirt in the terminals may affect readings. Remove the battery if the AVO410 is not to be used for a long period of time.
When the low battery symbol appears on the display, replace the battery. to avoid false or inaccurate measurements. To replace battery remove instrument from black boot and unscrew two screws on battery cover to reveal battery. An internal user replaceable fuse can be accessed for replacement by unscrewing the four deep recess screws. Carefully separate the two halves of the tester taking care of battery lead. Use only the recommended replacement fuse (10 A 500 V 32 mm).

SPECIFICATIONS

• Display: 6000 counts updates 1.5/sec.
• Polarity indication: Automatic, positive implied, negative indicated
• Overrange indication: “OL” or “-OL”
• Low battery indication: Displayed when the battery voltage drops below operating voltage
• Auto power off: Approx 10 minutes
• Operating ambient: Non-condensing ≤10 °C, 11 °C ~ 30 °C (≤80% R.H) 31 °C ~ 40 °C (≤75% R.H), 41 °C ~ 50 °C (≤45% R.H)
• Storage temperature: -20 ºC to 60 ºC, 0 to 80% R.H. when battery removed from meter
• Temperature coefficient: 0.15 x (Spec.Acc’y) / ºC, <18 ºC or > 28 ºC
• Power requirements: Standard 9V battery NEDA 1604, IEC6F22, JIS006P
• Battery life: Alkaline 300 hours
• Dimensions (W x H x D): 76 mm x 158 mm x 38 mm without holster 82 mm x 164 mm x 44 mm with holster
• Weight: 522 g

Electrical Specifications

Accuracy is ± (% reading + number of digits) at 23 ºC ±5 ºC, less than 80% R.H

DC/AC volts

Range| DC accuracy| AC accuracy|
---|---|---|---
600.0 mV *1| ± (0.5% + 2 digits)| 50 Hz/60 Hz sine wave|
| only for 600.0 mV range,|
6.000|
| ± (0.9% + 5 digits) 50 Hz|
60.00 V|
| ~ 500 Hz|
600.0 V| | |

DC 1000 V/AC 750 V

• Over voltage protection: DC 1000 V or AC
• Input impedance: 10 MΩ // less than 100 pF
• CMRR/NMRR (Common mode rejection ration/normal mode rejection ratio)
  • VAC: CMRR >60 dB at DC, 50 Hz/60 Hz
  • VDC: CMRR >100 dB at DC, 50 Hz/60 Hz
  • NMRR >50 dB at DC, 50 Hz/60 Hz
• AC conversion type: AC conversions are AC coupled True RMS responding, calibrated to the sine wave input. The basic accuracy is specified for a sine wave below 4000 counts. Over 4000 counts, add 0.6% to the accuracy. For non-sine waves below 2000 counts, refer to the following for accuracy: ±1.5% addition error for C.F from1.4 to 3
• Crest factor: C.F. = Peak/rms

DC/AC current

6000 µA
6.000 A| ±(1.5% +6 dgt)
50 Hz ~ 500 Hz *1| 2 V max
10.00 A

Overload protection

• A input: 10 A (500 V) fast blow fuse
• μA input: 600 V rms
• AC conversion type: Conversion type and additional specification are the same as DC/AC voltage

Resistance

6.000 KΩ
60.00 KΩ
600.0 KΩ
6.000 MΩ| ± (1.0% + 2 digits)
60.00 MΩ *1| ± (1.5% + 2 digits)

• Open circuit voltage: -1.3 V approx.
  • 1 <100 digit rolling
  • 2 <10 digit rolling

Diode check and continuity

• Max. test current: 1.5 mA
• Max. open circuit voltage: 3 V
• Overload protection: 600 V rms
• Continuity: Built-in buzzer will sound when the resistance is less than 500 Ω approx. Response time is 100 ms approx.

Frequency

| Frequency: 0.1% ±1 digit
60.00 KHz
600.0 KHz
6.000 MHz| 250 mV rms
60.00 MHz| 1 V rms

• Overload protection: 600 V rms
  • Less than 20 Hz, the sensitivity is 1.5 V rms
  •  Max. sensitivity: <5 V ac rms

Capacitance

60.00 nF
600.0 nF
6.000 µF
60.00 µF
600.0 µF
6.00 mF*

• Overload protection: 600 V rms
  •  <100 digit of reading rolling
• Auto power off (APO): If idle for more than 10 minutes

Accessories

• Battery (installed)
• Test leads
• User manual

Repair And Warranty

The instrument contains static sensitive devices, and care must be taken in handling the printed circuit board. If an instrument’s protection has been impaired it should not be used, but sent for repair by suitably trained and qualified personnel. The protection is likely to be impaired if for example; it shows visible damage; fails to perform the intended measurements; has been subjected to prolonged storage under unfavorable conditions, or has been subjected to severe transport stresses.
Note: Any unauthorized prior repair or adjustment will automatically invalidate the warranty.

Instrument Repair And Spare Parts

For service requirements for Megger instruments contact:

Megger Limited or Megger

• Archcliffe Road :  Valley Forge Corporate Centre
• Dover 2621 :  Van Buren Avenue
• Kent CT17 : 9EN Norristown PA 19403 England. U.S.A.
• Tel: +44 (0) 1304 502 243
• Tel: +1 610 676 8579
• Fax: +44 (0) 1304 207 342
• Fax: +1 610 676 8625

Returning and Instrument for Repair

If it is necessary to return an instrument for repair, a Returns Authorization number must first be obtained by contacting one of the addresses shown. You will be asked to provide key information, such as the instrument serial number and fault reported when the number is issued. This will enable the Service Department to prepare in advance for the receipt of your instrument, and to provide the best possible service to you.
The Returns Authorization number should be clearly marked on the outside of the product packaging, and on any related correspondence. The instrument should be sent, freight paid to the appropriate address. If appropriate a copies of the original purchase invoice and of the packing note, should be sent simultaneously by airmail to expedite clearance through customs. For instruments requiring repair outside the warranty period a repair estimate will be submitted to the sender, if required, before work on the instrument commences.

Approved Repair Companies

A number of independent instrument repair companies have been authorised for repair work on most Megger instruments, using genuine Megger spare parts. A list of approved companies is available from the UK address shown.

Deceleration of Conformity

Hereby, Megger Instruments Limited declares that radio equipment manufactured by Megger Instruments Limited described in this user guide is in compliance with Directive 2014/53/EU. Other equipment manufactured by Megger Instruments Limited described in this user guide is in compliance with Directives 2014/30/EU and 2014/35/EU where they apply. The full text of Megger Instruments EU declarations of conformity are available at the following internet address: megger.com/eu-dofc

References

• EU declarations of conformity PDF download | Megger
• Electrical test equipment | power station to plug | Megger

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