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Introduction and Specifications
Conventions
1
1-5
Chapter 7. IEEE-488 Option (2620A only)
This chapter describes the IEEE-488 option. Included are specifications, theory of
operation, maintenance, and a list of replaceable parts. Schematic diagrams for this
option are included at the end of the overall Service Manual (Chapter 8).
Chapter 8. Schematic Diagrams
Includes schematic diagrams for all standard and optional assemblies. A list of
mnemonic definitions is also included to aid in identifying signal name abbreviations.
Chapter 9. HYDRA Starter Calibration Software
This chapter provides an extened tutorial that demostrates how to perform a series of
operations. These operations introduce you to the menu structure of the Starter with cal
software, explain what the menu items do, and teach you how to use them.
1-5. Conventions
Throughout the manual set, certain notational conventions are used. A summary of these
conventions follows:
• Instrument Reference
The Hydra Data Acquisition Unit (Model 2620A), the Hydra Data Logger(Model
2625A), and the Hydra Data Bucket (Model 2635A) share manyfeatures and
functions. The term Hydra refers to any of theseinstruments. The model number
(e.g., 2620A, 2625A, or 2635A) isused when features unique to one instrument are
being described.
• Printed Circuit Assembly
The term "pca" is used to represent a printed circuit board and itsattached parts.
• Signal Logic Polarity
On schematic diagrams, a signal name followed by a "*" is active (orasserted) low.
Signals not so marked are active high.
• Circuit Nodes
Individual pins or connections on a component are specified with adash (-) following
the assembly and component reference designators.For example, pin 19 of U30 on
assembly A1 would be A1U30-19.
• User Notation
For front panel operation,
XXXAn uppercase word or symbol without parentheses indicates a button to be
pressed by the user. Buttons can be pressed in four ways:
1. Press a single button to select a function or operation.
2. Press a combination of buttons, one after the other.
3. Press and hold down a button, then press another button.
4. Press multiple buttons simultaneously.
For computer interface operation,
XXX An uppercase word without parentheses identifies a command byname.
<XXX> Angle brackets around all uppercase letters mean press the<XXX> key.
(xxx) When associated with a keyword, a lowercase word inparentheses
indicates an input required by the user.