How to calibrate COBOX Wattmeter Power Analyzer
The COBOX Wattmeter device is easy to calibrate. All that is need is a Bluetooth Terminal application
on your Android smart device. The application used in this example is Bluetooth Terminal
application from Querty. You can find it on Google Play.
To calibrate the COBOX Wattmeter device, simply install (if you have not done that already) and run
the Bluetooth Terminal application (to run the application tap on the Bluetoothe terminal application
icon). The COBOX Wattmeter device should first be pairied with the Android smart phone device.
The figure below shows the icons of the installed COBOX Wattmeter Analyser and Bluetooth
Terminal applications.
Then, connect the Bluetooth Terminal application to the COBOX Wattmeter device. You can see data
received from COBOX Wattmeter device. The figure below shows the data received from the COBOX
Wattmeter device that is connected to a battery – NO LOAD.
Next, press the RESET button on the COBOX Wattmeter device in order to restart the device and
observe the Software version and factory calibrated data. The Android smart device is still connected
to COBOX Wattmeter device via Bluetooth after the reset button is pressed.
Now, you can clear calibration data and load the new one in COBOX Wattmeter device.
Output from COBOX wattmeter
after the reset button has been pressed
Output from COBOX wattmeter
after sending “C” for “clear calibration data”
Press “c” and “SEND” button to transfer data to COBOX Wattmeter device wirelessly via Bluetooth in
to clear the calibration values and enter new ones. You must send “c” in 6 seconds after reset button
was pressed. After 6 seconds COBOX Wattmeter device will start to work normally.
Now you can write your own data for calibration into your COBOX Wattmeter device.
After every input, the send button has to be pressed in order to transfer new calibration piece of
data into the COBOX Wattmeter.
After new calibration data are entered you get the printout message, that new calibration data are
saved.
The calibration data can be set in values of the form X.XXX
STEADY_amp : If your motor controller or load have some current consumption when not in move,
just powered on.
Calibrate_voltage_divider: Voltage calibration number
Calibrate_current_divider: Current calibration number
MEASURMENTS FOR CALIBRATION MODE:
If you press the reset button on the COBOX Wattmeter device and send “m” to Bluetooth Terminal,
you get uncalibrated output values. This helps you to calculate new calibration divider data for
“Voltage” and “Current”. After new reset or disconnect/reconnect COBOX Wattmeter device, you
will enter “normal mode”.
HOW TO CALCULATE NEW CALIBRATION VALUE:
Trusted Measured value / Cobox Wattmeter = new calibration divider
NOTE: You have to measure for new calibration at Calibrate_voltage_divider = 1.000 &
Calibrate_current_divider = 1.000.
Order & info: www.cobox-ebikes.com