Multimeter

This is my homebrew multimeter. It differs from standard multimeters in several respects.

1. Only the most used modes are actually included: VDC, Ohms, Capacitance
2. Powered by a USB cable, no changing batteries.
3. Generally a different user interface because of 1 and 2.

Calibration

Calibration is relative to my Fluke 101 Multimeter. I know that there is probably some technical problems with this, as the Fluke 101 does not have more digits than this meter, nor is it substantially more accurate, at least in voltage mode. However, I don't have a really nice bench top meter, so it will have to do.

Specs

• Input Resistance: 521kΩ
• Range
• Voltage: +/-60V
• Resistance Range 1: 30Ω - 1.2kΩ
• Resistance Range 2: 1.2kΩ - 500kΩ
• Capacitance: 50nF - 47uF
• Relative Accuracy
  • Voltage: 0.3%
  • Resistance: 10%
  • Capacitance: 5%