How to unpack and install the Zygo Mark II 4-inch interferometer system?

Unpacking operation: Unpacking in a clean and dry area requires two people to lift the main unit from the bottom of both ends and remove it. It is forbidden to pull or tug on the outer shell; Before removing all items, do not discard reusable packaging boxes (it is recommended to keep them for return); Cushioning materials such as foam shall be used to prevent shock during handling to avoid severe impact.

（3） Connection and switch settings

Cable connection: Connect the BNC cable according to Figure 4-1 (host monitor) and Figure 4-2 (host monitor printer); The default factory setting for the CCTV camera jumper in the host is "output synchronization", which does not require adjustment.

Power and parameters: Insert the monitor power cord into any auxiliary power outlet on the back of the host; Confirm that the position of the "75 Ω/HI-Z" switch on the monitor is correct (see Figure 4-1/4-2); The host power cord should be connected to a power source that meets the requirements of the electrical label on the back. It is recommended to use a three hole socket with neutral grounding.

Operation process

（1） Preparation before operation

Safety prerequisite: It is necessary to read Chapter 3 "Laser Radiation Safety Information" before operating the host.

Equipment preheating: After turning on, the host and monitor need to be preheated for at least 30 minutes to ensure stable performance.

Familiarity with controls: Clearly define the functions of each button on the host and remote control box (such as the power switch, beam attenuation knob, and accessory socket tilt adjustment knob on the host; the fast stripe acquisition switch and zoom/focus adjustment switch on the remote box).

（2） Core operational steps

Boot startup

Confirm that the front beam attenuation knob of the host is pushed in, turn on the power switch, and the laser should start within 30 seconds. If it does not start, refer to the troubleshooting section of Service Manual SP-0038; There is a slow melting fuse on the back of the host (see Chapter 6 "Fuse Specifications" for the model).

Remote control box operation (see Figure 5-4)

Quick FAS switch: Center off, left dial "ALIGN" (alignment mode, hold for about 2 seconds, monitor displays aligned spot and automatic alignment crosshair), right dial "VIEW" (observation mode, hold for about 2 seconds, display interference pattern).

Zoom adjustment: With the center closed, it can achieve 6x continuous magnification (corresponding to aperture diameter for planar testing and f-number for spherical/cylindrical testing).

Focus adjustment: Center off, operate at 6x (or close to 6x) zoom, hold down the left and right keys, observe the edges of the test piece or small objects inserted into the beam (such as pen tips) until the outline is clearest (the stripes are not bent at the edges and are sharply truncated), do not directly focus on the stripes (their width is determined by the illumination intensity and needs to be adjusted by the monitor brightness/contrast).

Installation and alignment of transmission components

Universal installation: For transmissive components (flat or spherical), hold the metal edge in hand (do not touch the glass), loosen the spring clip screw of the accessory socket, insert the short metal pin of the component into the socket slot, and then rotate clockwise until it clicks into place. Finally, tighten the spring clip screw.

Alignment of transmission plane: After turning on the remote box, dial "ALIGN" for about 2 seconds, and the monitor will display a crosshair and two light spots (the bright spots are reflected by the uncoated surface of the transmission plane). Adjust the two tilt knobs of the accessory socket to make the bright spots coincide with the center of the crosshair.

Transmission sphere alignment: Remote box dial "ALIGN" for about 2 seconds, the monitor displays a crosshair and a light spot (reflected by the transmission element surface), adjust the tilt knob to make the light spot coincide with the center of the crosshair; Place the test piece (or 4% reflectivity concave convex surface) at the focal point of the converging beam of the transmissive element, and move the test piece so that the curvature center coincides with the focal point of the transmissive sphere (the bright spot converges at the center of the crosshair and disappears); Switch the "VIEW" mode. If the bull's-eye pattern displayed by the monitor is offset, use the X/Y knob of the 3/5 axis bracket to center (do not move the tilt knob of the host), and then focus through the Z axis knob (push the movement direction of the observation ring on the back of the bracket: move the Z axis clockwise when moving toward the center, and counterclockwise when moving outward). Finally, adjust the X/Y knob at the socket end of the transmission element to control the number of stripes to 0-7 (the best observation effect).

Installation and alignment of aperture converter

Preliminary preparation: Remove the transmission component from the accessory socket of the host, place a flat reflector with two axis brackets (reference or transmission plane) in the laser light path (about 45.7cm away from the host), and align the reflector using the "transmission plane alignment" process (this alignment state needs to be maintained).