# Configure

{% hint style="info" %}
For configuration we need your fully charged power meter, a computer or mobile device with bluetooth capabilities, and a tape measure.

Measurements are recorded and entered using Millimeters
{% endhint %}

## 1. Connect 

Make sure your power meter is on and connect via our [OGL app](https://app.onegiantleap.co.nz)

![click on the '+' and connect to your power meter](/files/-M-Sbsqr7g6fL6AjqeAs)

![](/files/-M-SduSPiZeqTpgrvdrO)

Everything should look pretty similar to the screenshot above. We need to fill in the 'Blade tip to hand distances' and the 'Blade tip to datum distance' to properly configure your power meter for use.

## 2. Measuring blade tip to hand distances

### A. Measuring blade tip to top hand

Place then end of the tape measure on the tip of the blade and measure to the top hand position. The top hand position is located in the mid-point of the handle grip. Write down the measurement, we'll input it in a bit.

![Top hand distance here is 1250 mm](/files/-M-X9h82dBiXF0sAAcfD)

### B. Measuring blade tip to bottom hand

Same as before, place the end of the tape measure on the tip of the blade and measure to the bottom hand position. The bottom hand position is located at the middle finger knuckle. Make a note of the measurement. 

![Bottom hand distance here is 610 mm](/files/-M-X9sfIkbyhxsb1PmgY)

{% hint style="success" %}
To make sure the power meter operates with consistent accuracy, it is important that your bottom hand location does not deviate from your bottom hand measurement. It is highly recommended to tape the shaft at the location, similar to the image below
{% endhint %}

![](/files/-LXX66K9zxrqG5ANSAew)

## 3. Measuring blade tip to datum distance

Same as before, tape measure on the tip of the blade and measure to the datum. The datum on a dragon boat shaft is located where the shaft attached to the blade ends, as shown below.

![datum distance here is 820 mm](/files/-M-X3TxvRbNM_ILlBbZd)

## 4. Enter measurements

click on the 'Blade tip to hand distances field and enter you measurements.

![](/files/-M-XD7k4Pdi4Jw5yJqu3)

![](/files/-M-XDGxgLUfYJClXhI2j)

![All measurements are successfully stored, good on ya!](/files/-M-XDUc8GF8x1H-qZJkw)

## 5. Zero Offset

The output of a load cell when the shaft is experiencing no force is referred to as the **Zero Offset**. Each load cell has an associated zero offset.

The **Zero Offset** of a load cell can drift a small amount with a change in temperature. This is why manufacturers of power meters typically recommend performing a Zero Offset calibration on a semi-regular basis.

The **Zero Offset** of a load cell will be between -2047 and 2047. A typical **Zero Offset** will change no more than 2-5 units between calibrations. A difference of 10 or more is an indication that either a bending force is being applied to the shaft; that there is an issue with that particular channel or that you recently travel from an extremely hot or cold climate.

{% hint style="info" %}
After performing a number of Zero Offset calibrations, it will quickly become clear how frequently or infrequently a Zero Offset calibration is required. If the Zero Offsets vary by no more than **two** between calibrations, then there is little to be gained from performing a calibration regularly.
{% endhint %}

To do an offset, click on the hamburger menu in the upper left hand and select  'Calibration'

![](/files/-M-Sn3FlLB4g4ebn1924)

On the right side of the screen, click on the box that says 'Zero Offset' to perform a zero offset calibration. 

![a small box will appear at the bottom to let you know your zero offset calibration has been successful.](/files/-M-SndoGaf8kmYeQe3uh)


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