AVT5548 B - hour meter. Self-assembly set

Description

In "Elektronika Praktyczna" 12/2015, a project of a mini-timer was published which can be installed in a supervised device. The presented project is an extension of that idea to the possibility of measuring the time when the power consumption of the device exceeds the set value.

Recommendations: the meter can be useful, for example, to maintenance services for planning repairs of machines and devices.

Project AVT 5548 EP 09/16

properties

• 8-30 V DC power supply, current consumption approx. 15 mA
• Remembering the measured time when a power loss is detected
• Detection of current at 50 Hz or 60 Hz
• Minimum response threshold: approx. 70 mA rms value
• Time counted down in one of three forms: days, days and hours, hours and minutes
• Signaling the countdown by flashing the dot on the display
• Stopping the countdown after overflow
• It is possible to delete the saved time
• 4-digit LED display
• A printed circuit board with dimensions of 90 × 29 mm