3156B User Manual
Maintenance and Performance Checks 6-2
Racal Instrument © 2005
Special Handling
of Static Sensitive
Devices
CMOS devices are designed to operate at very high impedance levels
for low power consumption. As a result, any normal static charge that
builds up on your person or clothing may be sufficient to destroy these
devices if they are not handled properly. When handling such devices,
use the precautions described below to avoid damaging them:
1. CMOS IC’s should be transported and handled only in
containers specially designed to prevent static build-up.
Typically, these parts are received in static-protected containers
of plastic or foam. Keep these devices in their original
containers until ready for installation.
2. Ground yourself with a suitable wrist strap. Remove the devices
from the protective containers only at a properly grounded
workstation.
3. Remove a device by grasping the body; do not touch the pins.
4. Any printed circuit board into which the device is to be inserted
must also be grounded to the bench or table.
5. Use only anti-static type solder suckers.
6. Use only grounded soldering irons.
Once the device is installed on the PC board, the device is adequately
protected and normal handling may resume.
Cleaning
The Model 3156B should be cleaned as often as operating conditions
require. To clean the instrument, use the following procedure:
1. Thoroughly clean the inside and outside of the instrument.
2. When cleaning inaccessible areas, remove dust with low-
pressure compressed air or a vacuum cleaner.
3. Use alcohol applied with a cleaning brush to remove
accumulation of dirt or grease from connector contacts and
component terminals.
4. Clean the exterior of the instrument and the front panel with a
mild detergent mixed with water, applying the solution with a
soft, lint-free cloth.