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Model 11713A
Service
SECTIOIM vm
INTRODUCTION
This section provides information on service related
subjects. Safety considerations include warnings
to be observed while servicing the instrument. The
arrangement of the principles of operation and
troubleshooting is explained.
The service sheets are in the following foldout sec¬
tion. Each service sheet includes a schematic dia¬
gram, with, accompanying principles of operation.
Usually a component location diagram is also in¬
cluded. Figure 8-1 Schematic Diagram Notes pro¬
vides general information which relates to block
and schematic diagram symbols.
-Other-per-ti-n#nt::-e@EviG©=--i-nformat.i;
0
-n.--is.. --inGlu-ded-
throughout the section.
This section contains warnings and cautions which
must be followed for your protection and to avoid
damage to the equipment.
Maintenance described herein
is per¬
formed with power supplied to the in¬
strument and with protective covers re¬
moved. Such maintenance should be per¬
formed only by service-trained personnel
who are aware of the hazards involved.
Where maintenance can be perform.ed
without
power supplied,
the
power
should he removed.
Any
maintenance, and repair of the
opened instrument under voltage should
be avoided as much as possible and, when
inevitable, should be carried out only by
a skilled person who is aware of the haz¬
ard involved.
Capacitors inside the instrument may
still be charged even if the instrument
has been disconnected from its source of
supply.
Make sure that only fuses with the re¬
quired 250V rating, correct current rat¬
ing, and of the specified type (normal
blow, time delay, etc) are used for re¬
placement.
The use of repaired fuses
and the short-circuiting of fuseholders
must be avoided.
Whenever it is likely that this protection
has been impaired, the instrument must
be made inoperative and be secured a-
gainst any unintended operation.
SERVICE
..Service in.structioM
principles ..o.f opera¬
tion, troubleshooting, and repair.
PRINCIPLES OF OPERATION
The HP 11713A Attenuator/Switch Driver has a
self-contained power supply to provide the drive
requirements for programmable attenuators and
coaxial switches. The instrument includes solenoid
arc suppression diodes and has common terminal
supplies of +24 Vdc. The driver may be controlled
remotely by simple HP-IB commands or locally
from the front panel. Connections are made at the
rear panel to the ten pairs of current sinking tran¬
sistors that are provided. Two sets of four contact
pairs per set are present at each rear panel multi¬
pin plug. This plug mates with the attenuator drive
cable. The remaining two contact pairs are con¬
nected to the banana jacks mounted on the rear
panel. The banana jacks are available for driving
the coaxial switches or for optional applications.
Each pair of contacts is individually programmable
via HP-IB bus or from the front panel pushbutton.
The contact pair status is indicated by front panel
LED's in the appropriate pushbuttons. The contact
pairs 9 & 0 can be used to switch between one of two
loads or to reverse the current through a single load.
WARNINGS
8-1
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