---
title: How to calibrate a touch screen on an APII
description: Step-by-step instructions for calibrating the touch screen on an APII
---

[Skip to content](https://knowledge.rudolphresearch.com/how-to-calibrate-a-touch-screen-on-an-apii#main-content)

English

Show submenu for translations

![RRA\_Logo\_For\_email.png\]](https://knowledge.rudolphresearch.com/hs-fs/hubfs/RRA_Logo_For_email.png?height=50&name=RRA_Logo_For_email.png)

Open main navigation

Close main navigation

- English
  
  Show submenu for translations
- [Go to rudolphresearch.com](https://rudolphresearch.com/)

[Go to rudolphresearch.com](https://rudolphresearch.com/)

 Hello. How can we help you?

- There are no suggestions because the search field is empty.

1. [Ask Professor Rudy](https://knowledge.rudolphresearch.com/?hsLang=en)
2. [How To](https://knowledge.rudolphresearch.com/how-to?hsLang=en)
3. [Polarimeter](https://knowledge.rudolphresearch.com/how-to?hsLang=en#polarimeter)

# How to calibrate a touch screen on an APII

## Step-by-step instructions for calibrating the touch screen on an APII

Follow these steps to calibrate the touch screen on an APII.

1. Select the Menu option
2. Enter the passcode 123 then press the Login option
3. Select the Calibration and Service option
4. Enter the passcode 519 then press the Login option
5. Select the Instrument Settings option
6. Select the Control Panel option
7. Select the Turn Disk Protection Off option.  
     1. The instrument will reboot
8. Perform steps 1 - 6 again
9. Select the Touch Panel Calibration option
10. Select the Tools tab (if using a mouse double click. If not using a mouse touch the tab twice).
11. The screen will display a red circle and a counter. Touch and hold the red circle until the counter is complete and the red circle moves to the next calibration point of the screen.
12. Select OK
13. Select OK
14. Close the Control Panel window by pressing the red X on the upper right side of the window.
15. Select the Turn Disk Protection On option
16. Select Yes
17. Select OK  
      1. The instrument will reboot.
18. Test the touch glass to confirm if the calibration resolved the issue.

- [Product Information](https://knowledge.rudolphresearch.com/product-information?hsLang=en#main-content)

    - [Autopol® Polarimeters](https://knowledge.rudolphresearch.com/product-information?hsLang=en#autopol-polarimeters)
    - [Density Meters](https://knowledge.rudolphresearch.com/product-information?hsLang=en#density-meters)
    - [Refractometers](https://knowledge.rudolphresearch.com/product-information?hsLang=en#refractometers)
- [Troubleshooting](https://knowledge.rudolphresearch.com/troubleshooting?hsLang=en#main-content)

    - [Polarimeter](https://knowledge.rudolphresearch.com/troubleshooting?hsLang=en#polarimeter)
    - [AutoFlex](https://knowledge.rudolphresearch.com/troubleshooting?hsLang=en#autoflex)
    - [Density Meter](https://knowledge.rudolphresearch.com/troubleshooting?hsLang=en#density-meter)
    - [Refractometer](https://knowledge.rudolphresearch.com/troubleshooting?hsLang=en#refractometer)
    - [AlcoTest](https://knowledge.rudolphresearch.com/troubleshooting?hsLang=en#alcotest)
    - [Data Backup/Audit Trail/ Historical Data](https://knowledge.rudolphresearch.com/troubleshooting?hsLang=en#data-backup-audit-trail-historical-data)
    - [Pinter](https://knowledge.rudolphresearch.com/troubleshooting?hsLang=en#pinter)
    - [Troubleshooting - Boot Up Issue](https://knowledge.rudolphresearch.com/troubleshooting?hsLang=en#troubleshooting-boot-up-issue)
- [How To](https://knowledge.rudolphresearch.com/how-to?hsLang=en#main-content)

    - [Density Meter](https://knowledge.rudolphresearch.com/how-to?hsLang=en#density-meter)
    - [Polarimeter](https://knowledge.rudolphresearch.com/how-to?hsLang=en#polarimeter)
    - [AlcoTest](https://knowledge.rudolphresearch.com/how-to?hsLang=en#alcotest)
    - [Automation](https://knowledge.rudolphresearch.com/how-to?hsLang=en#automation)
    - [Refractometer](https://knowledge.rudolphresearch.com/how-to?hsLang=en#refractometer)
    - [21CFR11](https://knowledge.rudolphresearch.com/how-to?hsLang=en#21cfr11)
    - [Minimum PC Specifications](https://knowledge.rudolphresearch.com/how-to?hsLang=en#minimum-pc-specifications)
    - [VeriLinkRx](https://knowledge.rudolphresearch.com/how-to?hsLang=en#verilinkrx)
- [FAQ](https://knowledge.rudolphresearch.com/faq?hsLang=en#main-content)

    - [Printers](https://knowledge.rudolphresearch.com/faq?hsLang=en#printers)
    - [Warranty Coverage](https://knowledge.rudolphresearch.com/faq?hsLang=en#warranty-coverage)
    - [VeriLink Rx](https://knowledge.rudolphresearch.com/faq?hsLang=en#verilink-rx)
    - [Audit Trail](https://knowledge.rudolphresearch.com/faq?hsLang=en#audit-trail)
    - [Ports & Connections](https://knowledge.rudolphresearch.com/faq?hsLang=en#ports-connections)
    - [Software/Upgrades](https://knowledge.rudolphresearch.com/faq?hsLang=en#software-upgrades)
    - [Sample Cell](https://knowledge.rudolphresearch.com/faq?hsLang=en#sample-cell)
    - [AlcoTest-RI](https://knowledge.rudolphresearch.com/faq?hsLang=en#alcotest-ri)
    - [Quartz Control Plate (QCP)](https://knowledge.rudolphresearch.com/faq?hsLang=en#quartz-control-plate-qcp)
    - [Octapol](https://knowledge.rudolphresearch.com/faq?hsLang=en#octapol)
    - [Density](https://knowledge.rudolphresearch.com/faq?hsLang=en#density)

[![RRA logo](https://knowledge.rudolphresearch.com/hs-fs/hubfs/RRA%20logo.webp?width=300&height=137&name=RRA%20logo.webp "RRA logo")](http://rudolphresearch.com)

Welcome to the Rudolph Research Knowledge Base

Copyright © 2026, https://rudolphresearch.com/