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Model
211B
Section
V
Paragraphs 5~1
to 5-9
SECTION
V
MAINTENANCE
5-1.
INTRODUCTION.
5-2.
This section provides maintenance and service
information for the Model 211B Square Wave Genera-
tor. Performance
check,
adjustment procedures,
troubleshooting,
and repair and replacement informa-
tion are the major areas covered in this section.
Component location and schematic diagrams are also
included at the rear of the section.
5-3.
TEST
EQUIPMENT.
5-4.
Test equipment required for maintaining and
checking the performance of the Model 211B is listed
in Table 5-1.
Test equipment having characteristics
similar to those listed in the table may be substituted
for the performance check and adjustments.
5-5.
INSTRUMENT
COVER
REMOVAL.
5-6.
Thetop, bottom, and side covers are seperate-
ly removable.
Each cover is held in place by screws
which thread into fasteners attached to the instrument
side castings.
Removal of the top cover provides ac-~-
cess to all components and test points on etched cir-
cuit boards and to nearly all other components on
front panel assemblies.
Always remove instrument
PRESHOOT
\ BASELINE
PULSE
WIOTH
ROUNDING
OVERSHOOT
covers with the AC power
turned
off or power
cord
removed.
5-7.
PERFORMANCE
CHECK.
5-8.
The performance check verifies whether or
not the Model 211B is operating within the specifica-
tions as stated in Table 1-1. This check may be used
as part of an incoming quality control inspection,
as
a periodic operational check,
or after repairs and /
or adjustments have been made.
Recently calibrated
test equipment should be used when performing this
check. Performance checks must be carried outin the
sequence given below.
5-9.
REPETITION
RATE
a. Refer to Figure 5-2 and Table 5-1 and connect
required equipment
b. Set Model 211B controls as follows:
MULTIPUIER........-2++00-
Ll
FREQUENCY
Dial...........
1
SYMMETRY..........-5 peeve
00% duty cycle
AMPLITUDE
(V across 502). .5
VERNIER. oo...
cece eee e eevee d CW
OVERSHOOT
—_
ROUNDING
ae
PRESHOOT
Figure 5-1.
Definition of Output Pulse Characteristics
5-1
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