Calibration Guide – Topcon RL-H4C

Sep 28, 2019
Calibration Guide
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Calibration Guide for the Topcon RL-H4C rotating laser level

Calibration Guide Topcon RL-H4C rotating laser

Topcon to their credit does generally provide calibration instructions along with the RL-H4C when the laser is purchased.  This has been the primary reason I haven’t provided a calibration guide for this model to date.  However, there are a couple of hints and tips that are worth adding and not everyone keeps their instructions handy.

So, as always before trying to calibrate your laser make sure sure you know the height you need to calibrate to.  Usually, a reverse test on each axis will provide you with the correct height.  See post HERE for a guide on the reverse test.

The first thing we need to know is the direction of the two axes, X and Y.  The alignment markings on the top of the laser levels housing indicate the direction of the axis but not which one is which.  The photo below will help

Topcon RL-H4C axis diagram for calibration

Calibration Method Topcon RL-H4C

Topcon RL-H4C key pad control panel

To enter the calibration mode press and hold the “Height Alert” button and then short press the “Power” button, you can then let go of both buttons.  The “Height Alert” LED will be lit and the “Manual” LED will be flashing.  This indicates that the laser is in calibration mode and ready to set the X-Axis calibration.  To change axis press the “Left Slope” button once, now press the “Height Alert” button the Y-Axis is now selected to be calibrated and the “Auto Levelling” LED will light.

To adjust the height of the laser along your selected axis use the “Left Slope” and “Right Slope” buttons.  Repeated short presses will shift the height either up or down.  Once you get close to the required height wait a few seconds for the laser to settle.  This is required as pressing the buttons on the laser vibrates the sensors so you need to let then settle before saving the new level height.

To save the new calibrated height press the “Height Alert” button the LED above it will flash a few seconds, be patient, as the Topcon RL-H4C will shut itself down after about 6 or so seconds.  Calibration should now be saved.  I personally prefer to do each axis separately.  So, adjusting and saving the X-Axis, then checking it before moving on and repeating the process for the Y-Axis.

Out of Calibration Range Error

If you find that the laser does not finalise saving with the “Height Alert” LED flashing quickly.  Then, the Topcon RL-H4C is out of electronic calibration range.  At this point, it’s best to send your laser into a service centre experienced in fixing this problem.

As always the instructions on this site are a guide only and should only be followed by someone confident that they know what they are doing.  The Laser Level Review takes no responsibility for any work that you carry out on your or other peoples equipment.

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