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Lake Shore Model 480 Fluxmeter User’s Manual
8-2 Service and Calibration
8.2.1 Identification of Electrostatic Discharge Sensitive Components
Below are various industry symbols used to label components as ESDS:
8.2.2 Handling Electrostatic Discharge Sensitive Components
Observe all precautions necessary to prevent damage to ESDS components before attempting
installation. Bring the device and everything that contacts it to ground potential by providing a
conductive surface and discharge paths. As a minimum, observe these precautions:
1. De-energize or disconnect all power and signal sources and loads used with unit.
2. Place unit on a grounded conductive work surface.
3. Ground technician through a conductive wrist strap (or other device) using 1 M

series resistor to
protect operator.
4. Ground any tools, such as soldering equipment, that will contact unit. Contact with operator's
hands provides a sufficient ground for tools that are otherwise electrically isolated.
5. Place ESDS devices and assemblies removed from a unit on a conductive work surface or in a
conductive container. An operator inserting or removing a device or assembly from a container
must maintain contact with a conductive portion of the container. Use only plastic bags approved
for storage of ESD material.
6. Do not handle ESDS devices unnecessarily or remove from the packages until actually used or
tested.
8.3 LINE VOLTAGE SELECTION
Use the following procedure to change the instrument line voltage selector. Verify the fuse value
whenever line voltage is changed.
WARNING: To avoid potentially lethal shocks, turn off controller and disconnect it from AC
power before performing these procedures.
1. Identify the line input assembly on the instrument rear panel. See Figure 8-1.
2. Turn the line power switch OFF (
O ).
3. Remove the instrument power cord.
4. With a small screwdriver, release the drawer holding the line voltage selector and fuse.
5. Slide out the removable plastic fuse holder from the drawer.
6. Rotate the fuse holder until the proper voltage indicator shows through the window.
7. Verify the proper fuse value.
8. Re-assemble the line input assembly in the reverse order.
9. Verify the voltage indicator in the window of the line input assembly.
10. Connect the instrument power cord.
11. Turn the line power switch On (
l ).