Product Details

The ZYGO ZMI-501A, part number 8020-0237-03, is a discontinued standalone two-channel interferometer measurement electronics unit of ZMI series, designed to pair with ZYGO ZMI-7705 heterodyne laser head for high-precision displacement metrology. Unlike VME form factor ZMI-2001 and ZMI-2002 boards, ZMI-501A adopts enclosed standalone housing without VME chassis requirement, which is convenient for integration into lithography stages, optical inspection platforms and custom precision motion systems. It receives optical beat signal from interferometer optics and converts the heterodyne signal into digital position data for closed-loop servo control.

This unit supports 2 independent measurement axes, with position resolution of 1.24 nm, maximum measurement velocity up to ±0.475 m/s. It requires minimum input optical power of 8.0 µW from optical fiber input. It is equipped with serial port, parallel port and reference signal interface for host communication and synchronous triggering. The built-in cyclic error correction function reduces nonlinear measurement error of heterodyne interferometer, which is critical for overlay control of semiconductor equipment. The power supply is +5.2VDC, with steady current consumption around 3.3A. Multiple ZMI-501A units can be synchronized for multi-axis stage systems. Its optical interface and firmware are specially matched with ZMI 7705 laser source, cannot be directly replaced with ZMI 2000 series VME measurement boards.

The front panel is fitted with optical signal input ports, communication connectors and status LED indicators for power, signal lock and fault alarm, supporting on-site diagnosis and routine maintenance. The housing adopts optimized ventilation heat dissipation structure and EMC shielding, lowering electromagnetic interference from linear motors and servo drivers in cleanroom environments. Users need to confirm full part number 8020-0237-03 and model ZMI-501A before replacement, match compatible ZMI-7705 laser head, fiber assembly and interferometer optics. This legacy ZYGO ZMI-501A unit is mainly supplied as spare replacement part for existing ZMI metrology systems. Users need to complete optical alignment and parameter calibration after installation. A conformal coated version is optional for high humidity and dusty industrial sites. This module is widely used in wafer stage maintenance, optical metrology bench upgrade and sub-nanometer motion feedback projects.

This two-channel measurement electronics adopts standalone enclosed housing structure. It requires +5.2VDC power supply. LED indicators display power, signal lock and fault status for convenient on-site inspection. The operating temperature range is 0°C to 40°C, storage temperature ranges from -40°C to +85°C, relative humidity 5% to 85% non-condensing. It complies with industrial shock, vibration and EMC standards and has CE certifications. It supports measurement parameter configuration backup for fast recovery after hardware replacement.

This ZYGO ZMI-501A (8020-0237-03) measurement electronics is widely applied in high-precision laser interferometer measurement systems. It decodes heterodyne optical signal and outputs sub-nanometer position data for precision positioning stages. As a reliable spare part for ZYGO legacy metrology systems, the ZMI-501A retains original signal timing and optical compatibility, helping customers reduce maintenance cost of legacy ultra-precision measurement equipment.