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HYDRA
Service Manual
1-6
Table 1-1. Hydra Features
• Channel Scanning
Can be continuous scanning, scanning at an interval time, single scans, or triggered (internal or external)
scans.
• Channel Monitoring
Make measurements on a single channel and view these measurements on the display.
• Channel Scanning and Monitoring
View measurements made for the monitor channel while scanning of all active channels continues.
• Multi-Function Display
Left (numeric) display shows measurement readings; also used when setting numeric parameters.
Right (alphanumeric) display used for numeric entries, channel number selection and display, status
information, and operator prompts.
• Front-Panel Operation
Almost all operations can be readily controlled with the buttons on the front panel.
• Measurement Input Function and Range
Volts dc (VDC), volts ac (VAC), frequency (Hz), and resistance (Ω) inputs can be specified in a fixed
measurement range. Autoranging, which allows the instrument to use the measurement range providing
the optimum resolution, can also be selected.
• Temperature Measurement
Thermocouple types J, K, E, T, N, R, S, B, and Hoskins Engineering Co. type C are supported.Also,
DIN/IEC 751 (Pt 385) Platinum RTDs are supported.
• Totalize Events on the Totalizing Input
• Alarms Limits and Digital Output Alarm Indication
• 4-Terminal Resistance Measurements (Ch. 1 .. 10)
• RS-232 Computer Interface Operation
• Measurement Rate Selection
• Nonvolatile Memory
Storage of minimum, maximum, and most recent measurements for all scanned channels.
Storage of Computer Interface setup, channel configurations, and calibration values.
• Features unique to the 2625A Data Logger.
Storage of measurement data: storage for 2047 scans of up to 21 channels, representing up to 42,987
readings.
• Features unique to the 2635A Data Bucket.
Internal storage of measurement data for 100 scans of up to 21 channels, representing up to 2,100
readings.
Memory card storage of instrument setup configurations so that instrument may be quickly set up to do
different tasks.
Memory card storage of measurement data for up to 4,800 scans of 10 channels on a 256K-byte card or
up to 19,800 scans of 10 channels on a 1M-byte memory card.
Enhanced RS-232 interface with higher baud rates and hardware flow control using the Clear to Send
modem control signal.