Agilent Technologies 5517B

60 Agilent 5517B/BL/C/D/DL/FL User’s Guide
6 Using the Laser Head in a System
Solving Problems
Here is information about three simple problems that may occur while you
are trying to make a measurement.
• If there is no red beam from the laser head:
• Ensure that the laser head cable is securely connected to the back of
the laser head.
• Ensure that the power supply is connected to the laser head cable.
• Ensure that the power supply is plugged into an operating outlet and
that the
POW ER ON light is illuminated.
• If the green LED on the receiver does not light:
• Ensure that there is a red beam from the laser head and the
Ready
LED is illuminated.
• Ensure that the laser beam passes through the large aperture in the
laser head.
• Ensure the laser head’s reference connector is connected to the
electronics.
• Ensure that the receiver cable is securely connected at the receiver
and at the system electronics.
• Ensure that the system electronics are connected to an operating
power source and are turned on.
• Ensure that the alignment of the laser head, optics, and receiver
causes the beam from the interferometer to be centered on the
receiver´s lens.
• Block the beam between the interferometer and measurement
reflector. The reference- path beam should be centered on the
receiver’s lens. When you unblock the measurement- path beam, it
should overlap the reference- path beam on the receiver lens.
• If everything above seems correct, but the LED still doesn’t light,
adjust the receiver’s gain control.
• If the controller does not indicate motion of the measurement reflector:
• Ensure that there is a red beam from the laser head and the
Ready
LED is illuminated.
• Ensure that the laser system electronics are powered.
• Ensure that the laser beam is properly aligned and that the
receiver’s green LED is lighted.
• If the receiver’s green LED remains lighted when no measurement
signal is present, reduce the receiver’s gain via its gain control.
• Ensure that the controller is on and the program is running.