flexitrax™ flexiprobe™ Operation Manual
1 Introduction
24
1.2
Definitions
When using a pushrod system, you need to understand the following concepts:
Calibration:
To accurately measure and display camera distances, you must calibrate the reel (coiler)
each time you power on the controller or attach a different pushrod. First, you must make sure
the pushrod
is fully rewound on the reel
. Then you must press the
Calibrate
button on the controller. See section 6.9.
Calibration is also known as
calibrating the rod counter
.
Zero distance:
Your survey needs to accurately record the distance of the camera from the starting
manhole so that pipe defects and features can be accurately located. However, in most cases you will
need to unwind the pushrod some distance so you can deploy the camera down into a manhole before
starting the pipe survey.
To ensure camera distances are recorded accurately in your survey videos and observations, you
need to zero the camera distance (‘set a zero distance’) when the camera is in position before you
start the survey. See
section 6.11
where this is described for pushrod systems and the same
principle applies for crawler systems.
Setting a zero distance is also known as
zeroing the cable
or
rod counter
.
Crawler and tractor
: both these terms are used in this document to refer to the motorized, wheeled
vehicle that is used to transport a camera.
