Manual

6613_OMU_2+2S_URT_V1_00 Firmware Description Document UG_6613_060
12 Rev. 1.1
4.5 Calibration Commands
Using the precision source method, the user provides a precision voltage and precision current load to the
device for calibration. The 6613_OMU_2+2S_URT_v100 firmware provides commands to calibrate the
measurement units. For linear current sensors, such as current shunt, no phase calibration is necessary.
There are two types of calibration commands. The first type provides complete calibration. The second
group, called atomic calibration commands, provides calibration for individual energy measurement
parameters of the IC.
4.5.1 Complete Calibration Commands (“Single Command Calibration”)
There are two calibration commands in this first group: CAL and CALW. Only one of these commands
is needed to calibrate the System/Unit.
To use these commands, a precision voltage source and a precision current source are required for the
calibration routine to use as a reference.
4.5.1.1 CAL Command
The CAL command calibrates the temperature, voltage, and current.
To calibrate channel 1, enter the following:
>CAL<CR> or CAL1<CR>
The response is:
TCal OK
VCal OK:
ICal 1 OK:
>
The device calibrates:
• The temperature (adjusts the Temperature Nominal MPU location 0xA6, saves to flash, and initiates
temperature gain compensation).
• The voltage (adjusts CAL VA and CAL VB registers and saves them to flash).
• And finally the current (adjusts CAL IA or CAL IB register and saves them to flash).
To calibrate the temperature, voltage, and current on channel 2, use the CAL2 command:
>CAL2<CR>
The response is:
TCal OK
VCal OK:
ICal 2 OK:
>
The CAL3 command calibrates both channel 1 and channel 2.