HP 5335A - HP-IB Interconnections

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installation
2-17. TEMPERATURE. The 5335A may be operated in temperatures from 0°C to +55°C.
2-18. HUMIDITY. The 5335A may be operated in environments with humidity up to 95%.
However, it should be protected from temperature extremes which cause condensation in
the instrument. Option 020, DVM, may be operated in environments with humidity up to 80%.
2-19. ALTITUDE. The 5335A may be operated at altitudes up to 4,600 metres (15,000 feet).
2-20. HP-IB INTERCONNECTIONS
2-21. HEWLETT-PACKARD INTERFACE BUS. Interconnection data concerning the rear panel
HP-IB connector is provided in Figure 2-3. This connector is compatible with the HP 10631A/
B/C/D HP-IB cables. The HP-IB system allows interconnection of up to 15 (including the con¬
troller) HP-IB compatible instruments. The HP-IB cables have identical “piggyback” connectors
on both ends so that several cables can be connected to a single source without special adapters
or switch boxes. System components and devices may be connected in virtually any configu¬
ration desired. There must, of course, be a path from the calculator (or other controller) to every
device operating on the bus. As a practical matter, avoid stacking more than three or four cables
on any one connector. If the stack gets too large, the force on the stack produces great leverage
which can damage the connector mounting. Be sure each connector is firmly (finger tight)
screwed in place to keep it from working loose during use.
2-22. CABLE LENGTH RESTRICTIONS. To achieve design performance with the HP-IB, proper
voltage levels and timing relationship must be maintained. If the system cable is too long, the
lines cannot be driven properly and the system will fail to perform properly. Therefore, when
interconnecting an HP-IB system, it is important to observe the following rules:
a. The total cable length for the system must be less than or equal to 20 metres (65 feet).
b. The total cable length for the system must be equal to or less than 2 metres (6.6 feet)
times the total number of devices connected to the bus.
c. To total number of instruments connected to the bus must not exceed 15.
2-23. 5335A HP-IB Address
2-24. The 5335A contains a rear panel HP-IB instrument address selection switch. There are five
switches, designated As, A 4 , A 3 , A 2 , Ai which are used to select the address. Instructions for
setting and changing the address are provided in Section III of this manual along with program¬
ming codes. When the instrument is turned on, the setting of the address switches is momentarily
displayed in decimal.
2-25. HP-IB Descriptions
2-26. A description of the HP-IB is provided in Section III of this manual. A study of this infor¬
mation is necessary if the user is not familiar with the HP-IB concept. Additional information
concerning the design criteria and operation of the bus is available in IEEE Standard 488-1978,
titled “IEEE Standard Digital Interface for Programmable Instrumentation”.
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