Zero breakdowns with digital milliohmmeter
Zero breakdown experience with Cropico DO4A portable digital milliohmmeters has led Canadian Pacific Railway to purchase a further 50 instruments.
Zero breakdown experience with Cropico DO4A portable digital milliohmmeters used by the Canadian Pacific Railway has led the CN Rail Signal and Communication division to purchase a further 50 instruments for use across its countrywide rail signal system.
The DO4As are being used to determine cable resistance and measure bonding, battery-to-rail and relay-to-rail resistance values on the 20V DC rail signal system.
Built-in rechargeable battery and charging circuit enables portable operation for up to 15 hours on one charge.
Principal application benefits of these battery/mains instruments include high accuracy and repeatability combined with a rugged aluminium case and the ability to work in temperatures down to -10°C.
Input terminal protection up to 415V RMS, digital calibration and long scale length 4000 count were additional benefits.
Four-wire measurement eliminates lead resistance errors and the instruments have open circuit lead warning.
There are six pushbutton ranges from 40 mohm to 4000 ohms, with resolution from 10 microhm on the 40 mohm range to 1 ohm on the 4000 ohm range.
Typical applications include resistance measurement of motor and generator windings, bonding tests and measurement of electrical joints and connectors.
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