Megger BT51/120 Low Resistance Ohmmeter, 120 V, 2000- and 20-Milliohm Ranges
- Brand
- Megger
- SKU:
- BT51/120
- Availability:
- DISCONTINUED, SEE 1012-280 or 1013-795
Megger BT51/120 Low Resistance Ohmmeter, 120 V, 2000- and 20-Milliohm Ranges Description
Megger BT51/120 Low Resistance Ohmmeter, 120 V, 2000- and 20-Milliohm Ranges The Megger BT51/120 Low Resistance Ohmmeter makes measurements by passing a current through the conductor under test and also monitoring the voltage across it. The test current is limited by a simple current limiting circuit and is measured by monitoring the voltage across a resistor. The test current is maintained at a nominal 2 A, and as the measurement is ratiometric, the reading is unaffected by any current variations. The instrument has a 3 1/2 digit LED display to facilitate use in low light levels. Two LED's on the front panel indicate battery condition and whether test current is flowing when a measurement is being made. A neon lamp indicates the presence of a dangerous voltage if the test spikes are accidentally placed across a live circuit. This warning takes place whether or not the instrument has been switched on. The BT51/120 ohmmeter is protected up to 240 V AC by a relay circuit that keeps the instrument in a safe mode isolated from the mains supply. Again, this safeguard is effective whether or not the instrument has been switched on. Operation of the BT51/120 is simple, there being only one range switch to set. Power is supplied by internal rechargeable cells and the charger unit is incorporated into the case. Duplex hand spike test leads are supplied and other types of leads are available. The instrument is built into a robust, portable case that is weatherproof and shockproof and has a hinged, detachable lid. The BT51/120 uses the four-terminal method of measurement. The main advantage of this method is that the resistance of the test leads is not included in the measurement. This is an important factor when the value of the measured resistance is very low.
Product Features
- High test current of 2 A DC Uses four-terminal measurement to eliminate errors caused by lead resistances
- Offers two measuring ranges (2000 milliohms and 20.00 milliohms)
- Provides maximum resolution of 0.01 milliohm
- Protected against inadvertent connection to mains supply 3.5 digit LED display facilitates operation in poorly lit environments
- Robust, portable case provides protection from shocks and weather Compatible with very long test leads Powered by internal rechargeable cells