Four channel period measuring data logger

This data logger is compatible with the CS615 and CS616 soil moisture probes from Campbell Scientific©.

Features

• Four period averaging channels.
• Four 5 vdc switched outputs with independently adjustable excitation times (0 to 9,999 milliseconds).
• Log interval selectable from 1 minute to 1 day.
• Data is easily imported into a spreadsheet for unit conversion.
• Battery backed real time clock.
• Flashing blue indicator led verifies datalogger operation.
• Power requirements: 5.5 to 18 vdc.
• 400 microamp current consumption while logging.

Measurement acquisition

The period of the input signal is determined by averaging 32 consecutive samples. Two measurement modes are software selectable for each input channel.

Mode 0

Mode 0 is for measuring low frequency signals with a period of 0.02 to 6.0 milliseconds (50,000 Hz to 167 Hz).
The resolution and accuracy of the measurement is +/- 0.100 microseconds.

This mode effectively covers the frequency range of the CS615 sensor.

Mode 1

Mode 1 is for measuring high frequency signals with a period of 3 to 200 microseconds (333.3 kHz to 5,000 kHz).
The resolution and accuracy of the measurement is +/- 0.0125 microseconds.

This mode effectively covers the frequency range of the CS616 sensor.

Additionally this datalogger includes protection against accidentally attaching the power supply backwards, a combination of zener diodes and transient voltage suppressors on the inputs and switched outputs to protect against momentary voltage spikes/shorts.

Requirements for use

• A PC with an available serial port running HyperTerminal (standard on Windows 95, 98, NT) for configuring the logger and collecting data.
• A standard 9-pin male/female RS232 cable.
• A suitable power source (5.5 to 18 vdc).
• An enclosure to provide protection for the data logger.

Data Storage

The number of time and date stamped samples that can be stored depends upon the number of channels selected for recording.

• Recording 1 channel      32,768
• Recording 2 channels    23,824
• Recording 3 channels    18,720
• Recording 4 channels    15,416

The contents of memory will be retained for up to ten years in the absence of power.

All settings are retained in non-volatile memory until changed by the user.

The dataloggers real time clock is backed up by a 3-vdc lithium battery for up to ten years in the absence of power.

Dimensions Length:  5.3 inches Width:  2.5 inches Height:  0.75 inches

SGT Engineering P.O. Box 3606 Champaign, Illinois 61826-3606

info@slsargent.com

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