How to use a Grade Rod for Measurement

The first step to using a rod measurement is extending the tool to its full length. A measuring rod will typically be collapsible and require manual adjustment to reach its full size. In order to do this, you should ensure that the numbers on the grade rod are spaced evenly — especially if you are working with a telescoping grade rod. If not fully extended, skipped numbers could result in inaccurate measurements.

To set up the transit level, you should place the level on the head of the tripod and secure it by threading or bolting it to the base. The spirit level should then be centered, indicating that it is level. When this happens, you may lock the legs of the tripod in place and proceed.

Once you have ensured that the tripod is level, you must create reference points for the measuring rod to measure against. To do this, you should create marks on a stick and hold it in place vertically while noting the measurements of the stick from the telescope of the transit. This step typically requires two people — one to hold the stick and one to note the measurements. It is best to enlist an assistant if you don’t already have one.

After the points have been determined, you can use the grade rod to determine the elevation of the plane in question. First, you must compare the measurements to the plane in order to establish its slope. This is done by holding the grade rod vertically and comparing it to the marked stick from the prior step. Then, the assistant must confirm this measurement using the telescope of the transit.

To make your measurement, you must read the numbers on the grade rod, and in order to do this, you must adjust the zoom and focus on the transit level. This will allow you to more clearly see the numbers and take an accurate measurement. Zoom and focus can typically be adjusted by manually manipulating a dial that is located on the transit level.

If you have successfully adjusted the zoom and focus of your transit and can view the grade rod through its telescope, you are ready to record your measurements. Look to see what numbers are displayed on the grade rod and move the rod to next spot you need to measure. Note that your transit should remain fixed while swiveling toward the new placement of your grade rod.