Tektronix WFM 601A, Service Manual

Page: 122 / 368

Maintenance
6–2
WFM 601A, WFM 601E, & WFM 601M Service Manual
Preparation
The service information presented in this section is intended for qualified service
personnel only. Before performing any service procedures, read the Service
Safety Summary and the General Safety Summary located at the front of this
manual.
The procedures in this manual assume you have a basic knowledge of the
operation of the waveform monitor. Refer to Operating Information in section 2
for an overview of the instrument functions. For more operating information,
refer to the User manual for your waveform monitor.
The waveform monitor contains electrical components that are susceptible to
damage from static discharge. Static voltages from 1 kV to 30 kV are common in
unprotected environments. Table 6–1 shows the relative susceptibility to static
discharge of common semiconductor types.
Table 6–1: Static susceptibility
Relative
level
Device type Voltage
1 MOS or CMOS 100 V – 500 V
2 ECL 200 V – 500 V
3 SCHOTTKY SIGNAL DIODES 250 V
4 SCHOTTKY TTL 500 V
5 HF BIPOLAR TRANSISTORS 400 to 600 V
6 JFETS 600 to 800 V
7 LINEAR
m
CIRCUITS 400 to 1000 V est.
8 LOW POWER SCHOTTKY TTL 900 V
9 TTL 1200 V
Observe the following precautions to avoid damage to components:
H
Minimize handling of static-sensitive components.
H
Transport and store static-sensitive components or assemblies in their
original containers, on a metal rail, or on conductive foam. Label any
package that contains static-sensitive components or assemblies.
H
Discharge the static voltage from your body by wearing wrist and foot
grounding straps. Service static-sensitive assemblies or components only at a
static-free workstation.
Prevention of
Electro-Static Damage to
Components