The LR-1A Calibration Stand is Simple and Easy to Use:

Simple leveling technology assures a level base for accurate and level rotation.


With the aid of our loading cart, the heavy and high center of gravity Long Rangers are fairly easy to maneuver into position. This allows for a more controlled and safer loading process of the calibration stand. The simple wedge design aids in alignment and positioning of the instrument to the optimum 12 degree tilt required by the TRDI calibration software.

Once the Long Ranger is in the LR-1B calibration stand, our easy rotating turntable allows for a smooth and balanced 360 degree rotation. A second turntable located inside the pivoting bucket simplifies the changing of the Long Ranger’s axis after each 360 degree rotation.

In the end, the LR1 minimizes the physical handling of the Long Ranger and saves time in the calibration process.

Demo LR-1A

Simple and Smooth Rotation Technology

Our calibration stands are designed to improve hard and soft iron calibrations, plus make it easier to perform the calibration procedure for a variety of Acoustic Current ProfilersLR-1A Steps

Loading and Calibration Instructions

Teledyne RD Instruments Long Ranger Workhorse:
UPWARD LOOKING Calibration (LR-1A)


STEP 1. Place the Calibration Stand on solid, level ground away from any metal, electrical, or other magnetic influences.

STEP 2. Use the three leveling adjusters on the calibration stand’s base to establish a level and steady platform before loading the instrument.

STEP 3. Use the Locking Pin to lock the turntable in place before trying to load the instrument (this insures the proper alignment and stability of the stand in preparation for loading).

STEP 4. Place the Long Ranger onto the cart’s frame with the transducers facing away from the calibration stand. Make sure that the com port at the base of the instrument is facing upward.

STEP 5. Tilt the pivoting bucket forward to the front of the the calibration stand.

STEP 6. Run the communication cable from the back of the stand, through the slot at the top of the pivoting bucket and out through the front.

STEP 7. Attach the communication cable to the base of the Long Ranger.

STEP 8. Carefully roll cart toward the stand until the Long Ranger base is touching the bottom of the pivoting bucket all the while making sure not to pinch the communication cable. Place the foam half circles inside the pivot bucket to protect the Long Ranger housing.

STEP 9. Begin lifting the Long Ranger Transducer Head until the instrument is seated firmly into the saddle of the calibration frame (Note: it will now be seated in the frame at the preferred angle of approximately 12 degrees).

STEP 10. You can reposition the Long Ranger by tilting it slightly away from the saddle and rotating the unit by means of the turntable inside the pivoting bucket. This allows you to position the Long Ranger so that the communication cable is off to the far side of the slot in the bucket. This will be the starting point for the calibration.



STEP 11. Remove the Locking Pin to free up the turntable so it can rotate.

STEP 12. Slowly rotate the turntable according to the calibration software.

STEP 13. After the 1st 360 degree rotation, reposition the Long Ranger (approximately 40 degrees) in the direction that places the communication cable
in the center of the slot at the bottom of the pivoting bucket.

STEP 14. Repeat step 11 for the 2nd rotation according to the calibration software.

STEP 15. For the 3rd and final rotation, reposition the Long Ranger so that the communication cable exits the pivoting bucket on the opposite side from the 1st rotation.

STEP 16. Repeat step 11 for the 3rd rotation according to the calibration software.

Calibration is now complete.



STEP 17. Use the Locking Pin to lock the turntable before trying to unload the instrument from the calibration stand.

STEP 18. Place the cart in the proper position and alignment with the saddle end of the cart tight against the base plate.

STEP 19. Now you can grab the Long Ranger transducers (for better control) and gently lower the Long Ranger until the instrument is firmly seated on the cart. Be sure the communication cable is free to move with the Long Ranger as it moves away from the pivoting bucket to avoid damage to the cable and connector.