Mach-DSP User’s Manual
Document Number: MACH-DSP-9021
Page 77
www.ScannerMAX.com
A.
Mount each scanner using an appropriate fixture, or X-Y mounting bracket. Make
sure the mirror is securely fastened to the galvo shaft. Direct a laser beam to the
scanner. If the ScannerMAX scanners were delivered with external mirror bumpers,
find the mechanical center by rotating the shaft from one stop to the other, marking
the center of the full excursion. Then ensure that the reflected laser beam is
projected in the direction of a calibrated optical target, as shown in figure 9.2
B.
Connect the
power supply
and
command input signal
to the Mach-DSP as
described in Chapter 3 (Connections). Also connect the special serial cable to a
Windows-based PC and the Mach-DSP. (Do not connect any scanners to the Mach-
DSP and do not apply power.)
C.
Launch the Mach-DSP application program on the PC, select the proper serial port
and press Connect. After that, apply power to the Mach-DSP servo driver. The
Mach-DSP program should show that it is connected to the Mach-DSP, and indicate
that there is a problem with the Position Sensor AGC of each scanner. (This is
because no scanners are currently connected…)
D.
On the Basic tab of the Mach-DSP program, set the
Servo gain, Integrator gain,
Position-Proportional gain, Low Frequency Damping and High Frequency Damping
all to 0. Set the I
nput Scale
to a value that is appropriate for your input signal. On the
Advanced tab, set the
Position fault detector
a little bit greater than your maximum
projection angle. For example, if you intend to project at 40 degrees optical-peak-to-
peak, you should set the
Positive-most position
to +11 and
Negative-most position
to
-11. (Remember, the Mach-DSP program uses mechanical degrees.)
E.
Plug the scanners into the Mach-DSP servo driver. The Mach-DSP will go through a
startup sequence, during which time the mirrors should not move much. After around
one second, the Mach-DSP program should show that the Position Sensor AGC
voltage is within a valid range.
F.
Using the Tools menu on the Mach-DSP program, open the Test Signal Generator
and set it for 40Hz, and 2 mechanical degrees peak-to-peak.
Target
Scanner
Laser
0
o
(center)
+X Degrees
-X Degrees
Figure 9.2: Position scale
and offset adjustment
