Oil-filled transformers used in transmission and distribution systems are rugged units built for long life. They are designed to handle continuous operation at full load and can withstand short-term operation at significantly higher loads. (more...)
Category: Blog
Using the Table Function in a DPM
The table function is used to define the relationship between the input signal and the output reading in a digital panel meter (DPM). This allows the user to implement a complex output function or correct system errors. Here are some examples where a table increases the versatility or improves the performance of a DPM. (more...)
Ground Detection Voltmeter 101
A ground detection voltmeter is used to monitor a floating battery bank for inadvertent grounding on either side. Historically, a center zero analog meter has been used for this application. The meter typically has a 250μA, 500μA, or 1mA DC movement, with a voltage scale of 100-0-100 for a 72V battery bank, (more...)
Current Sensing for Distorted Waveforms
Many AC current sensors work well on sine wave signals but cannot accurately determine the magnitude of distorted waveforms. Variable speed drives, electronic ballasts, LED bulbs, power converters, uninterruptible power supplies, and light dimmers are common sources of distorted current waveforms. Monitoring current in these devices requires careful equipment selection. (more...)
Tachometer Measurements
A tachometer is an instrument that measures the rate of rotation on a gasoline engine, electric motor, disk drive, or other spinning mechanism. The reading is usually displayed as revolutions per minute (RPM) in either analog or digital format. (more...)