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Introduction and Specifications
Introduction
1
1-3
1-1. Introduction
Hydra measures analog inputs of dc and ac volts, thermocouple and RTD temperatures,
resistance, and frequency. It features 21 measurement input channels. In addition, it
contains eight digital input/output lines, one totalizing input, one external scan trigger
input, and four alarm output lines. Hydra is fully portable and can be ac or dc powered.
An RS-232 computer interface is standard. An optional IEEE-488 computer interface is
available for the Hydra Data Acquisition Unit (2620A) only.
The Hydra Data Logger (2625A) adds substantial measurement memory capabilities.
The RS-232 computer interface is standard, but IEEE-488 capability is not available for
the Hydra Data Logger.
The Hydra Data Bucket (2635A) adds more flexible storage for instrument setups and
measurement data by adding a PCMCIA memory card and interface. The amount of
storage can be easily changed by selecting a memory card of the appropriate size for the
job.
The Hydra instruments share many features and functions. The term "instrument" is used
to refer to all three instruments. The model number (2620A, 2625A, or 2635A) is used
when discussing features unique to one instrument.
The instrument is designed for bench-top, field service, and system applications. A dual
vacuum-fluorescent display uses combinations of alphanumeric characters and
descriptive annunciators to provide prompting and measurement information during
setup and operation modes.
Some features provided by the instrument are listed in Table 1-1.
1-2. Options and Accessories
The following items can be installed either at the factory or in the field:
• Option 2620A-05K (IEEE-488 Interface Kit) consists of a printedcircuit assembly,
connecting cable, and mounting hardware. Thisfield-installable kit gives the 2620A
Hydra Data Acquisition UnitIEEE-488 interface capabilities. IEEE-488 computer
interfacecommands are virtually identical to RS-232 interface commands.
(The2625A and 2635A cannot be equipped with an IEEE-488 Interface.)
• Accessory 2620A-100 (Connector Kit).
The instrument can be mounted in a standard 19-inch rack panel on either the right-hand
or left-hand side using the Fluke M00-200-634 Rackmount Kit.
Accessories are listed in Table 1-2.
1-3. Operating Instructions
Full operating instructions are provided in the Hydra User Manual (2620A or 2625A)
and in the Hydra Data Bucket User Manual (2635A). Refer to the User Manual as
necessary during the maintenance and repair procedures presented in this Service
Manual.