1-Channel

A datalogger (also know as data acquisition system or DAS) is piece of electronic equipment which converts an input into a digital time series representation. Immense care should be taken when setting up and programming a datalogger. It is highly recommended that only experienced users program their own dataloggers and all others should consult a PASSCAL staff member for assistance.

While specific procedures and programming details will vary between the various types of dataloggers, there are several things that hold true when working with any datalogger.

The datalogger should be:

Salient Features These single component geophones are available as vertical units for use with the Texan digitizer and as vertical 6-channel strings for use with the multi-channel digitizer systems.  The multi-channel strings are rarely used. This single channel vertical geophone has a frequency of 4.5Hz, damping of .707 critical and a sensitivity of 100 V/m/s. The primary use of these geophones is for active source experiments. Manufacturer Documents: PASSCAL’s 4.5Hz, vertical geophones were manufactured by Geospace under part number GS-11D. Installation & Troubleshooting:

 Installation requires a separate bubble level to be placed on top of the geophone for proper leveling.

The RT125A, or texan, is a compact single channel datalogger with a self contained power supply (two D-cell batteries). Its primary application is for active source experiments.

When recording continuously at 100 sps, the battery life is approximately 120 hours. Higher sample rates will shorten the battery life and may fill up internal memory before the battery dies.

Features:

Single channel, 24 bit ADC Physical size: 3.0" diameter, 7.7" length Power source: two D-cell alkaline batteries Sample rate: 25 to 1000 sps Storage capacity: 256MB or 512MB