PSU Energy - DC - Picolog - Machine

⚠️Warning - LEGACY PROVIDER⚠️ #

This is a legacy provider and is not maintained anymore. It is only used in an old version of the Green Metrics Tool!

What it does #

It measures the DC energy by intercepting the cable pathway from the PSU to the ATX mainboard connector.

Classname #

• PsuEnergyDcPicologMachineProvider

Metric Name #

• psu_energy_dc_picolog_machine

Prerequisites #

The provider requires special hardware to work:

• PicoLog HRDL ADC-24
• Terminal board
• Custom ATX Y-cable

The provider is designed to only work with the 12-Pin ATX format from Fujitsu and assumes that all 12 V power rails are funneld together and sent over one shunt resistor.

The 11 Vsb and PWR_ON, PWR_OK rails are ignored as they carry not load.

The resistor is assumed to be a [Isabellenhütte PBV 0,005 Ohm](Isabellenhütte PBV 0,005 Ohm).

Configuration #

The provider is designed to run at a fixed sampling frequency of 61 ms, which is the maximum resolution the PicoLog HRDL ADC-24 can provide for one channel.

Please do not change this value in the config.yml

The provider will configure the PicoLog HRDL ADC-24 into streaming mode with 60 ms frequency sampling and capture the data every 61 ms

Input Parameters #

• args
  • -i: interval in milliseconds

By default the measurement interval is 1000 ms, which however is only for testing purposes.

As stated in the paragraph before the provider should always be used with 61 ms samling frequency

./metric-provider-binary -i 61

Output #

This metric provider prints to Stdout a continuous stream of data. The format of the data is as follows:

TIMESTAMP READING

Where:

• TIMESTAMP: Unix timestamp, in microseconds
• READING: The measured energy in millijoules

Any errors are printed to Stderr.

Troubleshooting #

If you cannot get a reading from the PicoLog HRDL ADC-24 try disconnecting the USB and reconnecting. It is very prone to getting stuck in the capture loop and then does not accept connections anymore.

Overhead warning #

The provider has a significant energy overhead when used as it draws power from the USB port of the system.

In our test system the PicoLog HRDL ADC-24 draws about 0.5 W on Stand-By and about 6 W when used with a 61 ms capture resolution.

If you are using a AC reporter in conjuction this will heavily skew your signal. Please either use only an AC or DC reporter, or correct the output data accordingly afterwards.