Recommended Test Equipment; Ac Power Grounding - HP 5501A Operating And Service Manual

d.
The installation of the electronic interface components. These procedures are divided
into major system configurations. Select the procedure that matches your system.
e. The system checkout procedure. These procedures are divided into major system con-
figurations. Select the procedure that matches your system.
f.
Preventive Maintenance. The system electronics require no preventive maintenance.
However, the system optics do require periodic cleaning. The frequency of the cleaning
is dependent on the cleanliness of the ambient environment.
The procedures are organized in this manner to make installation and checkout a s simple a s
possible.
In
addition, they can be used a s a basis for detailed troubleshooting either during
initial installation or at a later time when a system problem cannot be easily located. Table
5-7
i s a list of recommended test equipment needed to install, check out, and troubleshoot the
Laser Transducer System. Other equipment can be used if it meets the minimum specifications
listed.
Table 5-7. Recommended Test Equipment
1
Description Required Characteristics
I
Recommended Model
I
I
DC Voltmeter
1
k15V i0.025V and +5V i0.01V
1
HP 3435A
1
Logic Probe
Ability t o Indicate TTL and
/
HP 10525T/10525E
ECL Logic Levels
I
Oscilloscope
I
Ability t o Display Signals
I
HP 180A/1801A/1820A
between DC and 20
MHz
5.2 SYSTEM GROUND CONSIDERATIONS
IF
proper system grounding techniques are not observed, two adverse situations can occur:
a. A
system can be interconnected so that an electrical shock hazard exists. External
parts of various system components can be at different electrical potentials due to in-
complete system grounding. (See Figure 5-7).
ISOLATED
FROM
GROUND AT
SUPPLY
\
(
: : : :
SYSTEM COMMON
MOTOR
5501A
I
\
--
I
-
-A
MACHINE SThUCTURE
+ 1 5 V
SUPPLY SAME EARTH
-
GROUND CONNECTION
L /
-
NOTES:
1
Laser head
IS
grounded by belng phys~cally mounted on the work
table Power supply
IS
grounded for safety, but ~ t s outputs are
Isolated from ground
2 Motor currents cannot travel through power supply system
common because thls lhne
IS
Isolated from earth ground at the
power supply. It
IS
at ground potential, however, because the
5501A
IS
grounded
3. When thls
grounding
system
IS
used, do not connect "system
common" to earth ground at the power supply. Be sure, however,
that the laser head
IS
grounded to the machlne work surface.
Figure 5-7. AC Power Grounding