Description
Key Technical Specifications
| Parameter | Value |
|---|---|
| Manufacturer | ZYGO Corporation |
| Model | ZMI-2002 |
| Part Number | 8020-0211-1-J |
| Product Type | Displacement Measuring Interferometer (DMI) Measurement Board |
| Series | ZMI 2000 |
| Measurement Axes | 2 axes |
| Board Format | 6U VMEbus |
| Bus Standard | VMEbus Revision C.1 |
| Addressing | A16 / A24 |
| Data Transfer | D16 / D32 |
| Interface | VMEbus and P2 interface |
| Input Signal | Fiber optic reference and measurement signals |
| Position Format | 36-bit two’s complement |
| Velocity Format | 32-bit two’s complement |
| Time Resolution | 25 ns |
| P2 Data Rate | Up to 7.7 MHz |
| Power Requirement | +5VDC ±5% at 3.5A |
| Application | Precision positioning, semiconductor equipment, metrology systems |
Product Introduction
ZYGO ZMI-2002 8020-0211-1-J Overview
The ZYGO ZMI-2002 8020-0211-1-J is a dual-axis 6U VME measurement board designed for ZYGO ZMI 2000 displacement measuring interferometer systems. It receives optical interferometer feedback signals and converts phase information into high-resolution digital position, velocity, and acceleration data for precision motion applications.
The ZYGO ZMI-2002 8020-0211-1-J is typically used where conventional encoders cannot provide sufficient measurement resolution. Its VME architecture allows integration with legacy high-precision motion controllers used in semiconductor manufacturing, optical inspection equipment, and research-grade positioning platforms. Replacement requires verification of the complete interferometer configuration, firmware compatibility, and VME system addressing.
ZMI-2002 8020-0211-1-J
Application Scenarios & Field Pitfalls (The Engineer’s Perspective)
Engineering Pain Point
A semiconductor positioning stage begins showing repeatability errors during calibration. The servo drive responds correctly, mechanical alignment is within limits, but the measured position feedback is inconsistent.
In precision motion systems, the measurement chain is just as important as the servo hardware. A faulty interferometer board, incorrect fiber connection, or unstable VME communication path can create positioning errors that look like mechanical problems.
The ZYGO ZMI-2002 is the measurement processing core. Any replacement work must consider the entire metrology system.
Typical Applications
- Semiconductor Manufacturing – Wafer stage positioning, lithography alignment systems, and precision inspection equipment.
- Optical Metrology Laboratories – Laser interferometer measurement platforms and calibration systems.
- Aerospace Manufacturing – High-accuracy component measurement and precision positioning equipment.
- Precision Machine Tools – Closed-loop axis calibration and nanometer-level motion verification.
Technical Pitfalls to Avoid
- Verify Optical Signal Configuration
The ZMI-2002 relies on reference and measurement optical signals from the interferometer system. Incorrect fiber routing or damaged optical components can appear as a board failure.
- Confirm VME Address and Bus Settings
Legacy VME systems depend on correct addressing, interrupt configuration, and backplane compatibility. A replacement board may power correctly but fail to communicate if settings do not match.
- Check Measurement System Calibration
Replacing the electronics board may require recalibration of the complete interferometer measurement chain. Do not assume the previous calibration values remain valid.
Related Products
- ZYGO ZMI-2001
Single-axis version of the ZMI 2000 measurement board. Used when only one interferometric measurement channel is required. - ZYGO ZMI-PC
ISA bus measurement board variant for systems using PC-based architectures instead of VME platforms. - ZYGO ZMI 7702 Laser Source
Helium-neon dual-frequency laser source used with ZMI interferometer measurement systems. - ZYGO ZMI 2000 Series Measurement Boards
Product family including single-axis and dual-axis VME measurement electronics for precision positioning systems. - ZYGO ZMI 4004 Measurement Board
Later-generation measurement electronics platform offering updated processing capability for newer precision metrology applications. - ZYGO ZMI Go! Measurement Electronics
Compact measurement electronics platform designed for modern motion control integration. - ZYGO Linear Interferometer (LI) Series
Optical measurement components used with ZMI electronics for linear displacement measurement. - ZYGO ZMI Laser Interferometer Systems
Complete displacement measurement systems combining optical heads, laser sources, and electronic processing boards.
