Field Measurements 5:7
CP 1 – Cathodic Protection Tester Course Manual
© NACE International, 2000
02/01/05
Data Loggers
Data loggers are computerized instruments into which data, control points,
and other information can be entered. Some of them are so small they can
fit into a ground level test station. After use, data loggers are connected to a
computer and the information is downloaded. The computer can also create
graphs of data. Figure 5.4 shows a photo of a data logger.
Datalogger
Figure 5.4 Data Logger
X-Y Plotters
These instruments have two pens that record data on the X (horizontal) axis
and the Y (vertical) axis. They are very useful in stray current areas where
voltages are constantly varying. They are often used to make correlation
curves between rail-to-pipe voltage and pipe-to-soil potentials in mass
transit stray current work.
Strip Chart Recorders
Strip chart recorders contain a roll of chart paper. A pen or stylus records
voltage as the chart moves.
To Next Page
Loading...