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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.
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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
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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
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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