How to Upgrade Your GPI to Verifire SV 4"
By Zygo | Published: 2026-10-29
Category: How-to Guides
A step-by-step guide to upgrading your Zygo GPI interferometer to the Verifire SV 4" system, covering eligibility, ordering, and installation.
Quick Answer
Upgrading your GPI to a Verifire SV 4" is a factory-performed process that replaces the camera, electronics, and system controller. You'll need to verify eligibility, order the upgrade kit, and ship your instrument to Zygo for installation.
Eligibility and What's Included
The Verifire SV 4" upgrade is available for specific GPI models built between 1993 and 2006, including the GPI ST, GPI XP, GPI XPHR, GPI HS, GPI AT, and Verifire AT. If your system is outside this range or a different model, the upgrade may not be compatible.
The upgrade package includes a new 1200 x 1200 pixel camera, a new electronics package with motor and piezo controllers, a system controller running Windows 11 LTSC 64-bit, and a new RAID data storage system with two solid-state drives.
Step-by-Step Upgrade Process
- 1. Verify Your System Eligibility: Check your GPI model and build year. The upgrade works only on GPI ST, XP, XPHR, HS, AT, and Verifire AT units built between 1993 and 2006. Record the serial number for confirmation. A common mistake is assuming any GPI can be upgraded. Verify before ordering.
- 2. Order the Upgrade Kit: Purchase the GPI Upgrade to Verifire SV, 4" (product ID 1713511) from Zygo. The price is USD 0.32, which is a catalog comparison price of USD 0.47. Note that this is a factory-performed service, not a DIY kit. The listed price may be a placeholder or a deposit; confirm the full cost and service fee with Zygo before ordering.
- 3. Prepare Your Instrument for Shipment: Contact Zygo for shipping instructions. Pack your GPI interferometer securely according to their guidelines. Do not disassemble any components yourself, as this can void the upgrade warranty. Always use original packaging if available. Improper packing can damage sensitive optics.
- 4. Ship and Wait for Factory Installation: Send your instrument to Zygo's service center. The factory will replace the camera, electronics, system controller, and RAID storage. The process typically takes several weeks, depending on backlog. Plan for downtime. Have a backup measurement method or schedule the upgrade during a slow period.
- 5. Receive and Test Your Upgraded System: When the upgraded Verifire SV 4" returns, install it in your lab. Run the included calibration software and verify performance with a known reference. The new Windows 11 LTSC system controller may require initial network setup. If you encounter software or hardware issues, contact Zygo support immediately. Do not attempt to modify the new electronics.
Product Facts
- GPI Upgrade to Verifire SV, 4": This factory upgrade is for GPI ST, XP, XPHR, HS, AT, and Verifire AT systems built from 1993 to 2006. If your system is not listed or is from outside that date range, you cannot use this upgrade and should contact Zygo for alternatives.
GPI Upgrade to Verifire SV, 4"
