Page 1 / 4 www.soneltest.com

OVERVIEW The MMR-630 Series meter is a portable instrument for electrical engineering professionals who need a rugged fi eld tool for measuring very low resistances. It can be used for testing both resistive and inductive connections and junctions of electrical equipment such as motors and power transformer windings. To simplify measurements and save time a quick PASS/FAIL test function audibly indicates test progress, along with a display to show test results. Results are stored in internal memory and can be transferred to a computer for creating reports and to keep track of individual equipment test data over time for maintenance records.

MEASUREMENT CAPABILITIES - RESISTIVE » Welded and soldered connections, » Equipotential bonding » Ground wire » Terminals and connectors »

Cables and wires » Measurement via 4-pole method

MEASUREMENT CAPABILITIES - INDUCTIVE » Inductive windings (motors and transformers) » Low resistance coils

SELECTABLE MEASUREMENT MODES » Resistive - fast mode (3 seconds). » Inductive - normal mode with automatic discharge after measure-

ments (or by fast mode with lower accuracy). » Normal mode – push START button, » Automatic mode - when test leads are connected to the object

the microohmmeter automatically starts measurement with dual direction current flow and gives average result. This mode eliminates residual DC voltage on test item.

» Window mode - enables setting an upper and a lower limit between which the average measurement result is expected to appear. Results outside of this range are indicated by audio tones and out-of-range symbols.

HIGH NOISE IMMUNITY » Not affected by interference up to 20mV and from noise up to 100mV

DATA MANAGEMENT » Internal memory stores 990 measurement results » Data transfer data to a PC via RS232 cable, or Serial to USB Adapter

SONEL MMR-630Microohmmeter

Data Sheet Sonel MMR-630

Welded joints »

» Continuous mode - every 3 seconds for resistive objects, or continuous measurement for inductive objects.

Page 2 / 4 www.soneltest.com

Accuracy of the test current ±10%

Resistance measurement time:

3 seconds

SPECIFICATIONS

STANDARD ACCESSORIES SUPPLIED WITH THE MMR-630:

Data Sheet Sonel MMR-630

Resistive object type with bidirectional current

Inductive object type

of MMR-630 without batteries. With standard 12 V car lighter plug.

» 3 m / 10 ft test leads (2) » Crocodile clips black (4)» Kelvin vice (2) - shown on right» RS-232 serial transmission cable » Double pin Kelvin probe (2)» Hanging straps & carrying case» USB1.1/RS232 adaptor » User manual» Cable for battery charger » Ni-MH battery package 4.8V 3Ah» External battery charger allows continuous operation

2 to 10 minutes (max) depending on resistance and inductance of the object

Input impedance of the voltmeter ≥200 kΩ

Safety Double-insulated, according to IEC 61010-1 and IEC 61557

Measurement category CAT III 300V according to IEC 61010-1

Protection class IP54 / NEMA 3 according to EN 60529

Battery type Ni-MH battery 4.8 V

Battery charging time approx. 2.5 hours

Number of measurements with the current of 10 A 300

Auto-off time 120 seconds

Immunity to interference additional error <1% for voltage 60 Hz <100 mV RMS

Maximum test lead resistance at 10 A current 0.1 Ω

Maximum inductance of the tested object 40H

Dimension 295 x 222 x 95 mm / 11.5 x 8.7 x 3.7 inches

Weight 1.7 kg / 3.7 lbs

Operating temperature range 0 to + 40°C / 32°F to 104°F

Storage temperature range -20 to + 60°C / -4°F to 140°F

Page 3 / 4 www.soneltest.com

Range Resolution Current Voltage for full scale Accuracy

0 to 999.9 μΩ 0.1μΩ

10 A20 mV

±(0.25% of measurement

+ 2 digits)200 mV

RS-232C interface port

Resistance measurement start

Selection of additional function

Measurement terminal IZ

Measurement terminal U2

Measurement terminal U1

Measurement terminal I1

- option exit- back to the previous screen

Meter power supplyon and off button

Display backlighton and off button

Power supply socket

Set of cursors with auto-repetitionactivated when a button is held

Rotary function selector: - In the automatic range selection mode (Auto Ranging): selection of themaximum measurement current- In the manual range selection mode:selection of the measurement current- MEM memory search and deletion

- confirmation of the selected options- after the end of the measurement * saving mode start * saving of the measurement result to the selected cell in the saving mode * setting confirmation in MENU

200.0 to 999.9 mΩ 0.1mΩ0.1 A

1.0000 to 1.9999 mΩ 0.0001mΩ

2.000 to 19.999 mΩ 0.001mΩ

20.00 to 199.99 mΩ 0.01mΩ 1 A

1.0000 to 1.9999 Ω 0.0001Ω

2.000 to 19.999 Ω 0.001Ω 10 mA

20.00 to 199.99Ω 0.01Ω 1 mA

200.0 to 1,999.9Ω 0.1Ω 0.1 mA

Data Sheet Sonel MMR-630

Page 4 / 4 www.soneltest.com

Information Comment

The maximum acceptable temperature inside the meter has been exceeded. The thermal protection blocks measurements. Additionally the following is displayed: Overheated! T>Tmax and there are two long sound signals after the START button is pushed.

Indication of the charge of batteries.

Batteries are low, they must be charged.

Batteries completely discharged, the measurement is blocked.

Symbols of a resistance-type object.

Symbols of an inductive object (normal measurement time for this type).

Symbols of (reduced measurement time).

Swapped measurement leads.

Information of a 60Hz noise whose value is within the range between 100 and 500 mV. It is possible to perform measurements, but the measurement error may be increased (to 1%).

Impossible measure!

Voltage of the 60Hz noise exceeds 0.5V for R≥0,2mΩ or 100 mV for R<0,2mΩ. Measurements are blocked. Message and two long sound signals after the START button is pushed.Information regarding a limitation of the measurement current which is a result of the limit setting realised by means of the rotary knob, excessive resistance of the measurement leads or excessive inductivity of the measured object.

Information regarding charging of an inductive object.

Information regarding a discharged inductive object.

Information regarding overflow of the measurement range.

Information displayed at the right side of the screen during a measurement regarding a temporary overflow of the measurement range during charging an inductive object.

Voltage on the object!

A message with a long sound signal means the voltage at the terminals U1-U2 or U1-I1 or U1-I2 or U2-I1 or U2-I2 of the meter exceeds 50Vrms or the voltage at the terminals I1-I2 of the meter exceeds 6Vrms. Disconnect the meter from the tested object immediately!

Voltage on the object!

A message with a long sound signal means the voltage at the U1-U2 terminals of the meter exceeds 6Vrms, but it is lower than 50Vrms. Disconnect the meter from the tested object!

No continuity in U circuit!

Lack of continuity of the voltage circuit. A message and two long sound signals after the START button is pushed.

No continuity in I circuit!

Lack of continuity of the current or the current and voltage circuit. A message and two long sound signals after the START button is pushed.

Unstable conditions! Unstable conditions due to incorrect contact of the measurement leads or excessive inductivity of the object, which preclude measurements.

ADDITIONAL INFORMATION DISPLAYED BY THE METER

Data Sheet Sonel MMR-630