AMPROBE Digital Multimeter AM-420 User Manual

HARD AT WORK SINCE 1948.

AM-420
Digital
Multimeter
User Manual

Limited Warranty and Limitation of Liability

Your Amprobe product will be free from defects in material and workmanship for one year from the date of purchase unless local laws require otherwise. This warranty does not cover fuses, disposable batteries, or damage from accident, neglect, misuse, alteration, contamination, or abnormal conditions of operation or handling. Resellers are not authorized to extend any other warranty on the behalf of Amprobe. To obtain service during the warranty period, return the product with proof of purchase to an authorized Amprobe Service Center or to an Amprobe dealer or distributor. See Repair Section for details. THIS WARRANTY IS YOUR ONLY REMEDY. ALL OTHER WARRANTIES – WHETHER EXPRESS, IMPLIED, OR STATUTORY – INCLUDING IMPLIED WARRANTIES OF FITNESS FOR A PARTICULAR PURPOSE OR MERCHANTABILITY, ARE HEREBY DISCLAIMED. MANUFACTURER SHALL NOT BE LIABLE FOR ANY SPECIAL INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES OR LOSSES, ARISING FROM ANY CAUSE OR THEORY. Since some states or countries do not allow the exclusion or limitation of an implied warranty or of incidental or consequential damages, this limitation of liability may not apply to you.
Repair
All Amprobe returned for warranty or non-warranty repair or for the calibration should be accompanied by the following: your name, company’s name, address, telephone number, and proof of purchase. Additionally, please include a brief description of the problem or the service requested and include the test leads with the meter. Non-warranty repair or replacement charges should be remitted in the form of a check, a money order, a credit card with an expiration date, or a purchase order made payable to Amprobe.

In-warranty Repairs and Replacement – All Countries
Please read the warranty statement and check your battery before requesting repair. During the warranty period, any defective test tool can be returned to your Amprobe distributor for an exchange for the same or like the product. Please check the “Where to Buy” section on amprobe.com for a list of distributors near you. Additionally, in the United States and Canada, in- warranty repair and replacement units can also be sent to an Amprobe Service Center (see address below).

Non-warranty Repairs and Replacement – the United States and Canada
Non-warranty repairs in the United States and Canada should be sent to an Amprobe Service Center. Call Amprobe or inquire at your point of purchase for current repair and replacement rates.

USA: Canada:
Amprobe Amprobe
Everett, WA 98203 Mississauga, ON L4Z 1X9
Tel: 877-AMPROBE (267-7623) Tel: 905-890-7600

Non-warranty Repairs and Replacement – Europe
European non-warranty units can be replaced by your Amprobe distributor for a nominal charge. Please check the “Where to Buy” section on beha-amprobe.com for a list of distributors near you.

Beha-Amprobe
In den Engematten 14
79286 Glottertal, Germany
Tel.: +49 (0) 7684 8009 – 0
beha-amprobe.com
(Correspondence only – no repair or replacement available from this address. European customers please contact your distributor.)

AM-420

1. LCD display
2. Display HOLD button
3. Rotary switch
4. Test probe
5. Hazardous voltage
6. Display hold
7. Negative reading
8. Low battery indicator
9. Measurement reading

SYMBOLS

| Caution! Risk of electric shock
---|---
| Caution! Refer to the explanation in this manual
| Alternating Current (AC)
| Direct Current (DC)
| The equipment is protected by double insulation or reinforced insulation
| Earth (Ground)
| Battery
| Complies with European Directives
| Conforms to relevant Australian Standards
| Independently certified for U.S. and Canadian markets
| Do not dispose of this product as unsorted municipal waste. Contact a qualified recycler.

SAFETY INFORMATION

This meter complies with:
IEC/EN 61010-1 3rd Edition, UL61010-1 2nd Ed. and CAN/CSA C22.2 No.
61010-1-04 + CSA Update No.1: 2008 to Category II 250 Volts, Pollution degree 2
IEC/EN 61010-2-030
IEC/EN 61010-2-31 for test leads
EMC IEC/EN 61326-1

This product has been tested to the requirements of CAN/CSA-C22.2 No. 61010-1, second edition, including Amendment 1, or a later version of the same standard incorporating the same level of testing requirements.

Measurement Category II (CAT II) is for measurements performed on circuits directly connected to the low voltage installation. Examples are measurements on household appliances, portable tools, and similar equipment.

CENELEC Directives
The instruments conform to CENELEC Low-voltage directive 2006/95/EC and Electromagnetic compatibility directive 2004/108/EC

Warning: Read Before Using

• To avoid possible electrical shock or personal injury, follow these instructions and use the meter only as specified in this manual.
• Do not use the meter or test leads if they appear damaged, or if the meter is not operating properly. If in doubt, have the meter serviced.
• Always use the proper function and range for measurements.
• Before rotating the function range selection switch, disconnect the test probe from the circuit under test.
• Verify the meter’s operation by measuring on a known source.
•  Do not apply more than the rated voltage, as marked on the meter, between the test probes or between any test probe and earth ground.
• Use the meter with caution for voltages above 30 Vac RMS, 42 Vac peak, or 60 VDC. These voltages pose electrical shock hazards.
• Disconnect circuit power and discharge all high-voltage capacitors before testing resistance, continuity, and diode.
• Do not use the meter around explosive gas or vapor.
• When using the test leads, keep your fingers behind the finger guards.
• Remove test leads from the meter before opening the meter’s case.
• If the meter is used in a manner not specified in the user manual, the protection provided by the equipment may be impaired.
• To avoid injury, when the “battery low” indicator is present in the display, the product should NOT be used. A false measurement may occur. The
  battery should be replaced immediately.

UNPACKING AND INSPECTION

Your shipping carton should include:
1 AM-420 Multimeter
1 9V alkaline battery (installed)
1 User manual
If any of the items are damaged or missing, return the complete package to the place of purchase for an exchange.

FEATURES

• Residential digital multimeter to check for voltage in receptacles, electrical circuits, fuses, light bulbs, and electrical connections.
• Measurements: Voltage up to 250V AC/DC, DC Current, and Resistance
• Special functions: Audible continuity and diode test
• Event: Data hold
• Low battery warning
• Safety: CAT II 250V

WHILE MEASURING

1. Use the proper function and range for measurements.

2. To avoid possible electrical shock, personal injury, or damages to the meter, disconnect circuit power and discharge all high-voltage capacitors before
   testing resistance, continuity, and diode.

3. Connecting test leads:
   • Connect the common (black) test lead to the circuit before connecting the live lead
   • After measurement, remove live lead before removing the common (black) test lead from the circuit

4. Over-range indication: “1”, “-1”, or maximum display reading.

Rotary Switch Positions

| 200m| mA DC| DC current measurement up to 200 mA
20m| mA DC| DC current measurement up to 20 mA
2m| mA DC| DC current measurement up to 2 mA
200μ| μA DC| DC current measurement up to 200 μA
**| 2M| MΩ| Resistance measurement up to 2 MΩ
200k| kΩ| Resistance measurement up to 200 kΩ
20k| kΩ| Resistance measurement up to 20 kΩ
2k| kΩ| Resistance measurement up to 2 kΩ
200| Ω| Resistance measurement up to 200 Ω
| 9V| V DC| For measurement of dry batteries of not
exceeding 15 Vdc
1.5V| V DC| For measurement of dry batteries of not exceeding 2 Vdc
| V DC| Voltage measurement of diode PN junction
| Ω**| Continuity measurement, the buzzer will sound when s 10 52

HOLD Button
Press the HOLD button to freeze the present reading on display. Press again to resume normal operation.

Warning
To avoid electric shock, do not use the HOLD mode to determine if a circuit is live. The meter holds the reading on the display and does not refresh the reading automatically.

The “HOLD” button may be activated even when the product is NOT on. (If “H” appears on the left side of the display, HOLD is active.) The HOLD function allows the meter to continue displaying the last reading, which may be “0”. This reading will not change as long as the HOLD function is active, even if the meter is later connected to an energized circuit. “HOLD” can be disabled by pressing the “HOLD” button again. Readings will resume.

Measuring AC Voltage

Do not apply on a voltage source higher than AC 250V and use the proper range for measurement. Over-range indication: “1”, “-1” or a reading exceeds 250.

Measuring DC Voltage

Do not apply on a voltage source higher than DC 250V and use the proper range for measurement. Over-range indication: “1”, “-1” or a reading exceeds 250.

Measuring DC Current

To avoid personal injury or damage to the meter:

1. Do not attempt to make an in-circuit current measurement when the open-circuit potential to earth ground exceeds 250V.
2. Switch to proper function and range for your measurement.
3. Do not place the test probe in parallel with a circuit when the test leads are connected to the current terminals.
4. Connect the test leads to the circuit before powering the circuit under test.
5. After measurement, switch the circuit’s power to OFF before removing test leads from the circuit.

Measuring Resistance

Disconnect circuit power and discharge all high-voltage capacitors before testing resistance.

Measuring Continuity

Disconnect circuit power and discharge all high-voltage capacitors before testing continuity. The meter beeps at ≤ 10 Ω, beeper turns off at > 70Ω.

Measuring Diode

Disconnect circuit power and discharge all high-voltage capacitors before testing the diode.

Battery Test

Applying a voltage source or incorrect battery type under battery test may cause personal injury or damage to the meter.
Battery 1.5V range is for the dry battery not exceeding 2Vdc. The resistance load is around 50Ω.
Battery 9V range is for the dry battery not exceeding 15Vdc. The resistance load is around 1 k.

DETAILED SPECIFICATIONS

Ambient temperature: 23°C ± 5°C (73.4°F ± 9°F); Relative temperature: ≤ 75% Accuracy: ± (% of reading + digits) Maximum voltage between the input terminal and earth ground: AC 250 Vrms or DC 250 V

Fuse : F1 315 mA, H 250 V fast-fuse, ( 5 × 20) mm
Maximum display: 1999, updates 2 to 3/sec
Over-range indication: “ 1 “, “-1” or maximum display reading
Range: Manual ranging
Operating altitude: ≤ 2000 m
Operating temperature: 0°C to +40°C (32°F to 104°F)
Relative humidity: 0°C to +30°C (32°F to 86°F) ≤ 75%; +30°C to +40°C (86°F to 104°F) ≤ 50%
Storage temperature: -10°C to +50°C (14°F to 122°F)
Electromagnetic compatibility: In an RF field of 1V/m = Specified accuracy ± 5%. RF field > 1V/m is not specified.
Power supply: One 9V alkaline battery (6LF22, 6LR61, MN1604) or equivalent
Low battery indication:
Dimensions (L x W x H): 115 x 65 x 40 mm (4.5 x 2.6 x 1.6 in)
Weight: Approximately 275 g (0.61 lb) with battery installed

AC Voltage Measurement

Input impedance: around 0.5 M Ω
Frequency response: 45 Hz ~ 400 Hz
Overload protection: 250 VDC or AC rms

DC Voltage Measurement

Input impedance: around 1 M Ω
Overload protection: 250 VDC or AC rms

DC Current Measurement

Overload protection: 250 V max.
F1: 315 mA H 250 V fast-fuse, ( Φ5×20)mm

Open circuit voltage: around 3 VDC
Overload protection: 250 VDC or AC rms

: Continuity         : Diode Measurement

will not sound Resistance ≤ 10 Ω, the buzzer will sound 11 <  resistance < 70, not specified
| 1 mV| Open-circuit voltage is around 1.5V. Normal voltage is around 0.5V to 0.8V for silicon PN junction

Overload protection: 250 VDC or AC rms

Battery Test

For 1.5V range : Load resistance is around 50Ω
For 9V range : Load resistance is around 1kΩ

MAINTENANCE AND REPAIR

If the meter fails to operate, check the battery, test leads, etc., and replace as necessary. Double-check the following:

1. Replace the fuse or battery if the meter doesn’t work.
2. Review the operating instructions for possible mistakes in operating procedures.
   Except for the replacement of the fuse and battery, repair of the meter should be performed only by an authorized service center or by other qualified instrument service personnel. The front panel and case can be cleaned with a mild solution of detergent and water. Apply sparingly with a soft cloth and allow to dry completely before using. Do not use aromatic hydrocarbons, gasoline, or chlorinated solvents for cleaning.

BATTERY AND FUSE REPLACEMENT

Warning
To avoid shock, injury, or damage to the meter, disconnect the test lead from the measuring circuit before opening the case. ONLY use the fuse with the
amperage, interrupt, voltage, and speed ratings specified.
When replacing the battery and fuse, follow the below steps:

1. Disconnect the test lead probe from the measuring circuit.
2. Turn the Meter to the OFF position.
3. Remove the holster and the screws from the back cover, and then open the back cover.
4. Battery replacement: Remove the battery and replace it with one 9 V Alkaline battery (6LF22, 6LR61, MN1604) or equivalent. Pay attention to the polarity signs.
5. Fuse replacement: Replace the broken fuse F1 with a rating 315 mAH 250 V fast-fuse, ( 5×20)mm.
6. Put the back cover back, re-fasten the screw and install the holster back.

Battery: 9 V alkaline batteries (6LF22, 6LR61, MN1604) or equivalent
Fuse: 315 mA H 250 V fast-fuse, ( Φ5×20)mm

Visitamprobe.com for

• Catalog
• Application notes
• Product specifications
• User manuals

Amprobe®
amprobe.com
info@amprobe.com
Everett, WA 98203
Tel: 877-AMPROBE (267-7623)

Beha-Amprobe®
beha-amprobe.com
In den Engematten 14
79286 Glottertal, Germany
Tel.: +49 (0) 7684 8009 – 0

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