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Inspection and Cleaning
General Care
WFM 1125 Option 0A/0B/0C/0D Service Manual
Table 6-1: Relative susceptibility to static discharge damage
Semiconductor classes
MOS or CMOS microcircuits or discrete circuits, or linear
microcircuits with MOS inputs (most sensitive)
ECL
Schottky signal diodes
Schottky TTL
High frequency bipolar transistors
JFET
Linear microcircuits
Low power Schottky TTL
TTL (least sensitive)
1
Voltage equivalent for levels (voltage discharged from a 100 pF capacitor through
resistance of 100 ohms):
1 = 100 to 500 V
2 = 200 to 500 V
3 = 250 V
4 = 500 V
5 = 400 to 600 V
Inspection and Cleaning describes how to inspect for dirt and damage. It also
describes how to clean the exterior and interior of the WFM 1125 Digital
Television Waveform Monitor Option 0A/0B/0C/0D. Inspection and cleaning are
done as preventive maintenance. Preventive maintenance, when done regularly,
may prevent instrument malfunction and enhance its reliability.
Preventive maintenance consists of visually inspecting and cleaning the
instrument and using general care when operating it.
How often to do maintenance depends on the severity of the environment in
which the waveform monitor is used. A proper time to perform preventive
maintenance is just before adjustment.
The cabinet helps keep dust out of the waveform monitor and should normally be
in place when operating the instrument. The optional front panel cover protects
the front panel and display from dust and damage. It is recommended to install
the optional front panel cover when storing or transporting the waveform
monitor.
Relative susceptibility
1
levels
1
2
3
4
5
6
7
8
9
6 = 600 to 800 V
7 = 400 to 1000 V (est.)
8 = 900 V
9 = 1200 V
Maintenance
6-3
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