Single channel frequency data logger
SGT Engineering's single channel frequency data logger was designed for measuring and recording a single sensor which outputs a variable frequency signal in relation to some measured parameter.
This datalogger is compatible with the CS615 soil moisture probe from Campbell Scientific©.
Features
- One 16 bit Counter Channel (125 Khz maximum).
- Measurement period selectable from 1 to 45,000 milliseconds.
- Accuracy: + - 2 Counts from -10 to 60 degrees C.
- Resolution: 1 count.
- Log interval selectable from 1 minute to 1 day.
- Switched 5 vdc output with adjustable delay for enabling sensor.
- Data is easily imported into a spreadsheet for unit conversion.
- Battery backed real time clock.
- Stores 18,724 time and date stamped readings in non-volatile memory.
- Flashing blue indicator led verifys datalogger operation.
- Power requirements: 6 to 18 vdc.
- Less than 200 microamps current consumption while logging.
Additionally this datalogger includes protection against accidentally attaching the power supply backwards, a combination of zener diodes and transient voltage suppressors on both the input and switched output to protect against momentary voltage spikes/shorts. The switched output features a user specified delay from 1 to 45,000 milliseconds to allow for the sensor output to stabilize prior to measurement.
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 (6 to 18 vdc).
- An enclosure to provide protection for the data logger.
Data Storage
18,724 time and date stamped samples can be stored in non-volatile memory. The contents of memory will be retained for up to ten years in the absence of power.
If you were recording every hour, the memory would fill in 780 days.
Setting the logger up is simple.
- Set the real time clock.
- Set the log interval.
- Set the delay value to allow the sensor output to stabilize.
- Give the logger a unique I.D.
All settings are retained in non-volatile memory until changed by the user.
The datalogger's real time clock is backed up by a 3 vdc lithium battery for up to ten years in the absence of power.
Printed Circuit Board Dimensions
- Length: 3.8 inches
- Width: 2.5 inches
- Height: 0.75 inches