--- title: How To | Ask Professor Rudy description: Quickly find step by step instructions for performing common tasks. --- [Skip to content](https://knowledge.rudolphresearch.com/how-to#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/) 2. [How To](https://knowledge.rudolphresearch.com/how-to) # How To Quickly find step by step instructions for performing common tasks. - [How to resolve Windows Automatic Update Notifications](https://knowledge.rudolphresearch.com/how-to-stop-windows-automatic-update-notifications-on-rudolph-refractometers-and-polarimeters) - [What is the password for the database?](https://knowledge.rudolphresearch.com/what-is-the-password-for-the-database) - [QCP Certificate of Calibration](https://knowledge.rudolphresearch.com/qcp-certificate-of-calibration) ## Density Meter - [How to perform an air, water calibration on a density meter.](https://knowledge.rudolphresearch.com/how-to-perform-an-air-water-calibration-on-a-density-meter) - [Density Meter Real Time Clock Date and Time Configuration](https://knowledge.rudolphresearch.com/density-meter-date-and-time-configuration) - [How to Delete Instrument Log Files on An Automation System](https://knowledge.rudolphresearch.com/how-to-delete-instrument-log-files) - [How to Delete Log Files on a Density Meter](https://knowledge.rudolphresearch.com/how-to-delete-log-files-on-a-density-meter) - [How to clean the u-tube on a density meter (video)](https://knowledge.rudolphresearch.com/how-to-clean-the-u-tube-on-a-density-meter) - [Network drive mapping](https://knowledge.rudolphresearch.com/steps-to-map) - [Performing a factory restore on a density meter](https://knowledge.rudolphresearch.com/performing-a-factory-restore-on-a-density-meter) See less ▼ ## Polarimeter - [QCP Lifter Arm Calibration](https://knowledge.rudolphresearch.com/qcp-lifter-arm-calibration) - [How to change the screen orientation on an Autopol I / II / III](https://knowledge.rudolphresearch.com/how-to-change-the-screen-orientation-on-an-autopol-i-/-ii-/-iii-) - [Polarimeter - Unstable Reading](https://knowledge.rudolphresearch.com/unstable-reading) - [How to calibrate a touch screen on an APII](https://knowledge.rudolphresearch.com/how-to-calibrate-a-touch-screen-on-an-apii) - [Dark Sample Error](https://knowledge.rudolphresearch.com/dark-sample-error) - [What is the Polarimeter Lamp Life](https://knowledge.rudolphresearch.com/what-is-the-polarimeter-lamp-life) - [How to clean a sample cell](https://knowledge.rudolphresearch.com/how-to-clean-a-sample-cell) - [How to update the date and time on the instrument (Polarimeter AP IV, V, VI)](https://knowledge.rudolphresearch.com/how-to-update-the-date-and-time-on-a-polarimter-ap-iv-v-iv) See less ▼ ## AlcoTest - [Cleaning the AlcoTest Optics Module Prism Overview](https://knowledge.rudolphresearch.com/-cleaning-the-optics-module-prismoverview-0) - [Making hidden methods available for use on an AlcoTest](https://knowledge.rudolphresearch.com/making-a-method-visible-for-selection) - [How to create an offset and new method, Validate the system, and test a sample on an Alcotest](https://knowledge.rudolphresearch.com/how-to-create-an-offset-on-an-alcotest) - [AlcoTest Date and Time Configuration](https://knowledge.rudolphresearch.com/density-meter-date-and-time-configuration-0) ## Automation - [How to identify the valve box  pump vs vacuum motor on an S2 valve box](https://knowledge.rudolphresearch.com/how-to-identify-the-valve-box-pump-vs-vacuum-motor-on-an-s2-valvebox-) - [How to Clean the barcode scanner O-ring and adjust the bar code scanner spin speed.](https://knowledge.rudolphresearch.com/how-to-clean-the-bar-code-scanner-o-ring-and-adjust-the-bar-code-scanner-spin-speed) - [How to configure the AutoFlex system (add or remove instruments)](https://knowledge.rudolphresearch.com/how-to-configure-the-autoflex-system) - [Installation Tip for a New Barcode Scanner](https://knowledge.rudolphresearch.com/how-to-install-a-new-barcode-scanner) - [Resetting the Maintenance Counter](https://knowledge.rudolphresearch.com/resetting-the-maintenance-counter) - [Light Gate Permanent Calibration](https://knowledge.rudolphresearch.com/light-gate-permanent-calibration) See less ▼ ## Refractometer - [Selecting the custom scale/method on a series 5 J57 refractometer.](https://knowledge.rudolphresearch.com/selecting-the-custom-scale/method-on-a-series-5-j57-refractometer) - [Performing a factory restore on a J57 5 series refractometer.](https://knowledge.rudolphresearch.com/performing-a-factory-restore-on-a-j57-5-series-refractometer) - [Cleaning the Optics Module PrismOverview](https://knowledge.rudolphresearch.com/-cleaning-the-optics-module-prismoverview) - [How do I determine the software and firmware version of my J457 refractometer?](https://knowledge.rudolphresearch.com/how-do-i-determine-the-software-and-firmware-version-of-my-j457-refractometer) - [Turn On/Off Sample and Lot ID Requests](https://knowledge.rudolphresearch.com/turn-on/off-sample-and-lot-id-requests) - [Changing the precision on a J57 (S5).](https://knowledge.rudolphresearch.com/changing-the-precision-on-a-j57-s5) - [How to Calibrate the touch screen on a J57](https://knowledge.rudolphresearch.com/j57) - [USP 831 Refractometer Training](https://knowledge.rudolphresearch.com/usp831) - [Change the password on a J257, J357, and J357 computer based refractometer](https://knowledge.rudolphresearch.com/change-the-password-on-a-j257-j357-and-j357-computer-based-refractometer) - [Editing the Methods on a J257, J357, and J457 computer based refractometer](https://knowledge.rudolphresearch.com/editing-the-methods-on-a-j257-j357-and-j457-computer-based-refractometer) - [How to perform a Water Zero](https://knowledge.rudolphresearch.com/how-to-perform-a-water-zero) - [How to perform an air and water zero on a non-computer based refractometer.](https://knowledge.rudolphresearch.com/how-to-perform-and-air-and-water-zero-on-a-non-computer-based-refractometer) - [How to configure the test method decimal places.](https://knowledge.rudolphresearch.com/configure-display) - [How to back up the database on a refractometer with software version 2.3.0](https://knowledge.rudolphresearch.com/how-to-back-up-the-database-on) See less ▼ ## 21CFR11 - [Determining the 21CFR Part 11 User Level Access](https://knowledge.rudolphresearch.com/how-do-you-determine-the-user-level-access-on-21cfr-part-11) ## Minimum PC Specifications - [Computer Requirements For Rudolph PC Software](https://knowledge.rudolphresearch.com/minimum-computer-requirements) ## VeriLinkRx - [VerilinkRx Narcotics & Alarm Conditions, Customer Operating Procedure, How to Use the Verilink Video](https://knowledge.rudolphresearch.com/verilinkrx-narcotics-alarm-conditions-customer-operating-procedure-how-to-use-the-verilink-video) - [Product Information](https://knowledge.rudolphresearch.com/product-information#main-content) - [Autopol® Polarimeters](https://knowledge.rudolphresearch.com/product-information#autopol-polarimeters) - [Density Meters](https://knowledge.rudolphresearch.com/product-information#density-meters) - [Refractometers](https://knowledge.rudolphresearch.com/product-information#refractometers) - [Troubleshooting](https://knowledge.rudolphresearch.com/troubleshooting#main-content) - [Polarimeter](https://knowledge.rudolphresearch.com/troubleshooting#polarimeter) - [AutoFlex](https://knowledge.rudolphresearch.com/troubleshooting#autoflex) - [Density Meter](https://knowledge.rudolphresearch.com/troubleshooting#density-meter) - [Refractometer](https://knowledge.rudolphresearch.com/troubleshooting#refractometer) - [AlcoTest](https://knowledge.rudolphresearch.com/troubleshooting#alcotest) - [Data Backup/Audit Trail/ Historical Data](https://knowledge.rudolphresearch.com/troubleshooting#data-backup-audit-trail-historical-data) - [Pinter](https://knowledge.rudolphresearch.com/troubleshooting#pinter) - [Troubleshooting - Boot Up Issue](https://knowledge.rudolphresearch.com/troubleshooting#troubleshooting-boot-up-issue) - [How To](https://knowledge.rudolphresearch.com/how-to#main-content) - [Density Meter](https://knowledge.rudolphresearch.com/how-to#density-meter) - [Polarimeter](https://knowledge.rudolphresearch.com/how-to#polarimeter) - [AlcoTest](https://knowledge.rudolphresearch.com/how-to#alcotest) - [Automation](https://knowledge.rudolphresearch.com/how-to#automation) - [Refractometer](https://knowledge.rudolphresearch.com/how-to#refractometer) - [21CFR11](https://knowledge.rudolphresearch.com/how-to#21cfr11) - [Minimum PC Specifications](https://knowledge.rudolphresearch.com/how-to#minimum-pc-specifications) - [VeriLinkRx](https://knowledge.rudolphresearch.com/how-to#verilinkrx) - [FAQ](https://knowledge.rudolphresearch.com/faq#main-content) - [Printers](https://knowledge.rudolphresearch.com/faq#printers) - [Warranty Coverage](https://knowledge.rudolphresearch.com/faq#warranty-coverage) - [VeriLink Rx](https://knowledge.rudolphresearch.com/faq#verilink-rx) - [Audit Trail](https://knowledge.rudolphresearch.com/faq#audit-trail) - [Ports & Connections](https://knowledge.rudolphresearch.com/faq#ports-connections) - [Software/Upgrades](https://knowledge.rudolphresearch.com/faq#software-upgrades) - [Sample Cell](https://knowledge.rudolphresearch.com/faq#sample-cell) - [AlcoTest-RI](https://knowledge.rudolphresearch.com/faq#alcotest-ri) - [Quartz Control Plate (QCP)](https://knowledge.rudolphresearch.com/faq#quartz-control-plate-qcp) - [Octapol](https://knowledge.rudolphresearch.com/faq#octapol) - [Density](https://knowledge.rudolphresearch.com/faq#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/