Calibration Guide Topcon RL-H4C rotating laser

Updated September 2020 for added clarity.

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

Calibration Method Topcon RL-H4C

Each axis is calibrated separately.  So, adjusting and saving the X-Axis, then checking it before moving on and repeating the process for the Y-Axis.

X-Axis Calibration

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.

To set the X-Axis press “Height Alert” button and the “Manual” LED will stop flashing indicated ready to set the X-Axis calibration.

To adjust the height of the laser along the X-Axis use the “Left Slope” and “Right Slope” buttons.  Repeated short presses will shift the height either up or down (press and hold 1 second for each press, longer the press the further it shifts).  Once you get close to the required height wait a few seconds (up to 30 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.

Y-Axis Calibration

Enter calibration mode the same as before by pressing and holding 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.

To set to Y-Aaxis press the “Right Slope” button once, then press the “Height Alert” button, the Y-Axis is now selected to be calibrated and the “Auto Levelling” LED (green LED above the power button) will light.

To adjust the height of the laser along the X-Axis use the “Left Slope” and “Right Slope” buttons.  Repeated short presses will shift the height either up or down (press and hold 1 second for each press, longer the press the further it shifts).  Once you get close to the required height wait a few seconds (up to 30 seconds) for the laser to settle.  This lets the laser 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.

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.

Looking for the Topcon RL-H5A or RL-H5B calibration instructions? then click on the relevant model link.

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