Powermon Guide Rev. 1.0 03/10/2019
Table of Contents
1 Description............................................................................................................................................1
2 Usage.....................................................................................................................................................2
2.1 Scenarios.......................................................................................................................................2
2.2 Run Menu......................................................................................................................................3
2.2.1 Fields:....................................................................................................................................4
2.2.2 Status:....................................................................................................................................5
2.2.3 SNAPSHOT:..........................................................................................................................5
2.2.4 CLEAR:.................................................................................................................................5
2.2.5 START:..................................................................................................................................5
2.3 Other Menus..................................................................................................................................6
2.3.1 Setup:.....................................................................................................................................7
2.3.2 Limits:....................................................................................................................................8
2.3.3 Calibration:............................................................................................................................9
3 Source and data files.............................................................................................................................9
4 Installation...........................................................................................................................................10
1 Description
Powermon is a device built around the Texas Instruments INA219 chip, that can simultaneously
measure DC voltage and current and therefore calculate power. Powermon also measures run time and
which allows it to calculate capacity (mAh) and energy (mWh) for testing batteries. The accuracy of
voltage and current measurements is 0.5%. The current accuracy depends of course on the tolerance of
the shunt resistor. It uses an internal 0.1 Ohm 1% shunt but external shunts can be connected to extend
the current range. Powermon allows voltage and current measurements to be calibrated to get better
than 0.5% if a suitable reference is available and stores the calibration values for different shunts.
The voltage range is limited to 0..26V DC maximum (without protection diodes). With protection
diodes shown in the schematic, the voltage is limited to 0..20V. The voltage must never get negative
or exceed the maximum voltage or you will damage the INA219 chip.
Specs:
Table 1: Basic specs
Voltage 0..20VDC in 10 mV resolution Voltage is internally measured and
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