# A23 Zero Offset

### Definition

This function performs **manual zero-point compensation** to correct internal system timing offsets. The setting unit is **ns (nanoseconds)**, not a flow unit.

To configure, refer to the value displayed at the **bottom-left of the main screen User Debug Page**, and enter that value into **A23**.

**User Debug Page**

1. Make sure [**H10 Debug Page**](https://docs.lorric.com/qr/fu-es-echosense-instruction-manual/parameters/h-system/h10-debug-page) is turned on.
2. Return to the main screen and use the arrow keys to navigate to the **User Debug Page**.
3. Observe the value in the bottom-left (highlighted in yellow). The value may fluctuate slightly; it is recommended to observe for a while and enter the **average value** into **A23**.

<figure><img src="https://4028902321-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FSBz5Tlpy8GCIkK4ygkgZ%2Fuploads%2FqjlEfwQRCE79kwWgveFQ%2FFU-ES-Homepage-en-debug.jpg?alt=media&#x26;token=0f50f6aa-903b-4e4b-b53d-4b08c74a9d7d" alt="" width="563"><figcaption><p><strong>Debug Screen</strong> <em>(actual values may vary depending on conditions)</em></p></figcaption></figure>

### Notes

N/A

### Operation Procedure

<details>

<summary><strong>Button Functions</strong> <em>(Click to Expand)</em></summary>

When the main screen is displayed in **green backlight**, the four buttons function as follows:

* <img src="https://4028902321-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FSBz5Tlpy8GCIkK4ygkgZ%2Fuploads%2FRnX1fMK1ja5FUx043ZYc%2Fimage?alt=media&#x26;token=f31dd577-ba27-4369-af8b-25ce9afcd1f9" alt="" data-size="line"> **Blue Button (leftmost):** Return, exit, or save settings.
* Gray Direction Buttons:
  * <img src="https://4028902321-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FSBz5Tlpy8GCIkK4ygkgZ%2Fuploads%2FR48KXgI2flteQ78PYH8a%2Fimage?alt=media&#x26;token=b5b4ab82-6f88-44c6-8b85-181c7bde6fe9" alt="" data-size="line"> **Left Gray:** Previous Page, decrease value, or select item
  * <img src="https://4028902321-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FSBz5Tlpy8GCIkK4ygkgZ%2Fuploads%2FVWLxHCjTZgj8Y3CXUn6X%2Fimage?alt=media&#x26;token=35556f59-f963-4b03-8db1-34f2953ddb58" alt="" data-size="line"> **Right Gray:** Next Page, increase value, or select item
* <img src="https://4028902321-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FSBz5Tlpy8GCIkK4ygkgZ%2Fuploads%2F0lsHAW4cWIphk6mKtEoK%2Fbutton-orange.png?alt=media&#x26;token=9168c231-821c-4895-9194-0cf61b2fd06a" alt="" data-size="line"> **Orange Button (rightmost):** Rightmost button: Enter settings, edit, or confirm selection

{% hint style="danger" %}
**Do not hold buttons for extended periods to avoid damage.**
{% endhint %}

{% hint style="info" %}
Button functions may change depending on the operation context to improve usability or prevent accidental presses.
{% endhint %}

</details>

```
A23 Zero Offset Setting Steps
• From the main screen(green backlight), 
  press Orange Button(Setup) to enter settings (orange backlight).
• Use Gray Arrow Buttons to select A. Measurement, press Orange Button(Enter).
• Use Gray Arrow Buttons to select A23 Zero Offset, press Orange Button(Enter).
• Use Gray Arrow Buttons to choose the digit to adjust(highlighted in dark gray).
• Press Orange Button(Edit) to enter adjustment mode.
• Adjust digits: Left Gray Button to increase, Right Gray Button to decrease.
• Press Orange Button(Set) to confirm each digit; repeat for other digits as needed.
• After all digits are set, press Blue Button(Save).
Confirm by pressing Orange Button(Save) (or Blue Button(NOT) to cancel).
• Press Blue Button(ESC) to return to the main screen(green backlight).
```

### A23 Options, RS485 Values, Read/Write Commands, and Formats

| Input Range of This Parameter | Corresponding Values | RS-485  Value |
| ----------------------------- | -------------------- | ------------- |
| Default                       | 0                    | -             |
| Minimum                       | -100                 | -             |
| Maximum                       | 100                  | -             |

Refer to the [Read/Write Memory](https://docs.lorric.com/qr/fu-es-echosense-instruction-manual/communication/modbus-rtu-protocol/read-write-memory-ram) List for the Modbus command format. This parameter uses the float32 data format.