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L-740 Ultra Precision Surface Plate Calibration System


Surface Plate Calibration laser

Surface Plate Calibration Applications

The L-740 Ultra-Precision Leveling System offers the fastest, most accurate way of calibrating surface plate. With wireless targets offering resolutions down to 0.00002" (.0005 mm), automatically sweeping laser planes and high-powered alignment software, the L-740 is the ideal calibration tool for most surface plate applications.

Unsurpassed Laser Plane Flatness

The flatness of the laser plane is the most important factor in determining the overall accuracy of the system for measuring flatness. No one surpasses the flatness of our laser planes: In a 180-degree sweep the L-740's laser plane is flat to within 1/2 an arc second (0.00003"/ft or 0.0025mm/M). However, in a 90-degree sweep the laser plane becomes even flatter to within 1/4 of an arc second (0.000015"/ft or 0.001 mm/M).

L-740 2X Faster than Other Methods

The L-740 is so quick at taking data that it can calibrate a surface plate up to 2 times faster than any other method. In fact, most surface plates can be analyzed and calibrated in about 15 - 20 minutes, including setup! It also very simple to use as it has only 4 components: laser, target, RF receiver and software.

Continuously Sweeping Lasers Require Only 1 Setup

Continuously sweeping lasers are much faster than interferometers and autocollimators at calibrating surface plates because they only require 1 setup to calibrate a surface plate. With straight-line lasers, such as an interferometer or autocollimator, there are at least 8 setups to get enough data to calibrate the surface plate.

Grid Pattern Better Than Moody Union-Jack Methods

As the L-740 laser creates a reference plate from which to measure a surface plate, it does not need to employ the complex Mood or Union-Jack methods to "calculate" the flatness of surface plates. One problem with either of those methods is that they can miss sometimes-large areas of the surface plate where worn surfaces may be a cause for calibration errors. The L-740, by contrast, can measure as much or as little of the surface plate as desired as it uses a laser PLANE to measure the flatness plane of the surface plate.

Plane5 Software Automatically Downloads Data Using Grid Pattern

S-1388 Plane5 Software Our Plane5 software automatically downloads flatness data using our A-910-2.4ZB RF Receiver, which connects to any laptop through the serial port. The software utilizes a grid pattern to measure the flatness and can analyze thousands of points for flatness. For data analysis, it uses a least-squares, best-fit algorithm to calculate the flatness, which eliminates flatness errors associated with the laser plane not being perfectly parallel to the surface plate. It also identifies "bad" points by providing a 3D graph of the flatness profile.

Laser Planes Have 200' Range

One of the most powerful features of the L-740 is the automatically rotating laser plane with a range of 100 feet (30.5 meters) in radius. That means the flatness of even the largest surface plate can be checked with one setup.

Wireless Targets and Readouts

Wireless Targets and Readout Speeds Setup With Hamar's new line of wireless targets (A-1519-2.4ZB and A-1520-2.4ZB) there is no need to string long extension cords to reference targets. The targets have up to a 1" (25 mm) measuring range and can be used up to 100 feet (30.5 meters) from the readout. The new readout (R-1355-2.4ZB) uses a Nomad PDA, color software and a wireless receiver to display up to 5 targets simultaneously. Other features like electronic zeroing and target averaging help to speed setup. The A-1519-2.4ZB has a resolution of 0.0001" (0.0025 mm) and the A-1520 has a resolution of 0.00002" (0.0005 mm).

How it Works
General Leveling - How its works


  • Continuously sweeping laser plane with operational range of 100' (30.5 meters) in radius.
  • Laser plane is flat to 1/2 an arc second (0.00003"/ft or 0.0025mm/M) in 180º sweep and 1/4 arc second (0.000015"/ft or 0.001 mm/M) in 90º sweep.
  • Standard Targets: A-1520-2.4ZB Single-Axis Wireless Target with .250" (7 mm) Range and 0.00002" (.0005mm) Resolution.
  • Backlit levels accurate to 1 arc second (0.00006"/ft or 0.005mm/M).
  • Instant on with virtually no warm-up.
  • Typical set-up time 20 minutes or less.
  • Diode lasers 2 times more stable than HeNe based laser systems.
  • Battery or AC powered.
  • Completely self contained.
© 2012 Hamar Laser. Products Covered Under US & Foreign Patents.