Milliohmeter
Article No. 10888
Rhopoint Milli-Ohmeter M210 W/Clip Probe
- 5 mA Test Current
- 4 Terminal Input for a high degree of accuracy eliminates errors caused by test lead length.
- UKAS Calibration Certificate
- Portable digital meter
- Measure low resistances over the range 0.001O to 200O
Features
- 0.1% accuracy
- Lightweight and portable and is used easily in one hand
- Only 5mA test current, this ensures that the contact being tested is not ‘cleaned’ by the test current which can happen when higher test currents are used, this ‘cleaning’ of the contact under test leads to erroneous measurements
- Single push button operation
- 20 hours continuous operation (from standard PP3 or MN1604 battery)
- It has auto-ranging, auto-decimal point and auto-powerdown after three minutes
- Four terminal input, “Kelvin” configuration four wires are used to connect the circuit under test to the instruments. One pair of wires carries current generated by the instrument, the other pair connect to the voltage-measuring circuit. The current circuit is low impedance, the voltage circuit high impedance. When connected a current flows through the component or circuit under test and the voltage drop across the test points is measured.
- The ratio between the current and the voltage drop is calculated by the instrument using Ohm’s law (R=E/I) to display the result in ohms. Four clips would normally be required for connection but this could be tedious so a form of clip is used with the Milli-ohmeter. The jaws are moulded in robust plastic and inset into each jaw face is a copper / silver inlay contact; these are insulated from each other by the plastic mouldings. One contact face on each clip is connected to the current generating circuit, the other face is connected to the voltage-measuring circuit. In this way four wires are connected instantly by two clips. The resistance of the connecting wires plays no part in the measuring so no “backing-off” is required as would be the case if a multi-meter were to be used for the same measurement.
- Some typical applications: Relay, switch and connector contacts, PC-plated through holes, PC track resistance, Transformer and motor windings, Ring circuit testing, Earth conductor continuity, Wire-wrapped and solder joints, RFI shielding and coil resistance, Network cabling, Aircraft bonding check
Technical Attributes
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- Data
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Ranges: 1.999Ω, 19.99Ω, 199.9Ω Increments: 0.001Ω, 0.01Ω, 0.1Ω Accuracy: ±0.1% of range Zero Offset: ±0.001Ω Maximum: V 1.4V Maximum: A 5mA Temperature Drift: 0.1%/°C of lowest range Display: 3.5" digit LCD Battery: 9V (PP3 MN1604 or equivalent) Operating Temperature: 41°F - 95°F (5°C to 35°C) Weight: 510gms (including case and leads) Dimensions (in case): H 5.9", W 5.7", D 1.8" Dimensions (out of case): H 5.9", W 32", D 1.5"
Procedure
Using Standard Clip Leads M210/9A (supplied as standard)
- Plug either black plug into either black socket in the top of the instrument and red plugs into red sockets.
- Clip leads to circuit or component to be tested. Ensure that both faces of clip make good electrical contact.
- Press the ON button to read resistance.
Using Probe & Contact Connectors M210/9B (optional extra)
- Insert plugs into their respective sockets as illustrated. The outer plugs form the current circuit via the clips. The inner plugs (with yellow bands) connect the probes in the
- voltage measuring circuit.
- Clip leads to circuit under test.
- Press ON button to read resistance when the probes are in contact with the circuit.
Interpreting the Display
- The Milliohm-meter will read directly in ohms or milli-ohms.
- Fluctuating readings displayed. Check that the clips are making good contact with the circuit under
- test, then look for the cause of intermittency, e.g. dry solder joint, oxidized or corroded terminals;
- slight mechanical movement of the component(s) in the circuit under test should quickly reveal the
- source of the problem.
- Flashing “1” indicates that resistance in circuit exceeds 200 ohms.
- “LO BAT” displayed indicates low battery.
Battery Replacement
Slide down the cover at the rear, bottom of the instrument. Fit new battery 9 volt PP3 (MN1604 or equivalent). Replace cover.
Delivery Content
One Set of standard spring clip connectors, Leather case with strap, Leads, Instructions, and Certification and 2 Year Warranty