Burleigh WAVEMETER JR WA-2500, Руководство по эксплуатации

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Wavemeter
jr
Operating Manual 3. Operating Instructions
Burleigh Instruments, Inc. (04659-M-00 Rev E) page 3-9
Burleigh Park, Fishers, NY 14453
To Send” (CTS:pin#6) line. The CTS line is pulled high (+12V) to produce a “true” by
default, enabling data transmission in the absence of a user supplied signal to CTS.
If the CTS line is made “false,” data transmission will cease until CTS is made “true”
again.
If the data transmission is halted by the user for more than 10 lines of readings or
30 lines of error messages, the transmission buffer will clear itself and wait for a
true level on the CTS line or an Xon command on the RXD line before filling again.
This is to prevent the transmission of old data in the event that the user indefinitely
suspends data transmission. A “232 Er” message will appear periodically on the
display warning of a data transmission problem. When transmission resumes after
such a buffer clearing a “Transmission Break” message will be transmitted before
new data appears, indicating there has been a gap in data transmission.
Data from the WAVEMETERjr is transmitted at 2400 Baud on the “Transmit Data”
(TXD:pin#3) line. The data transmission format is a single start bit followed by an 8-
bit ASCII character; starting with the least significant bit (LSB) and ending with the
most significant bit (MSB). This 8-bit ASCII character is followed by 2 stop bits for a
total of 11 bits, no parity. The maximum line length is 22 characters followed by
carriage return/line feed (CR/LF) characters indicating the end of each line of data.
NOTE: Appendix A contains a sample program for communicating with the Wavemeter
jr
via RS-232.
3.11 INTERFEROMETER ALIGNMENT
Figure 1.1 shows the physical layout of the internal Michelson interferometer. Only
one end mirror is adjustable and it can be aligned using a small flat blade
screwdriver through two access holes in the rear panel.
Normally, major interferometer alignment should not be necessary. However, slight
adjustments to the ALIGNMENT screws may be useful to optimize the sensitivity of
the Wavemeter
jr
for low intensity laser sources.
If major realignment of the Michelson interferometer is required, refer to Figure 3.6
and use the following procedure:
1. Turn off the Wavemeter
jr
and disconnect the AC line cord.
2. Remove the top cover of the chassis. It is secured by 2 black screws in each
side. Carefully detach the ribbon cable connector on the main circuit board
that provides power to the display panel.
3. Remove the silver dust cover from the interferometer, which is secured by
one top screw.
4. Disconnect the 6-conductor ribbon cable from the Detector Board and remove
the single mounting screw that secures the board. Carefully lift the board
from the black plastic guide at its base.
5. Align the beam receiver with a HeNe laser and observe the laser beam that
would normally hit the detector by placing a white card just beyond where
the detector mounts, as shown in Figure 3.6.
6. Adjust the end mirror alignment until the spots observed on the white card
are superimposed. Interference fringes will be evident when the spots are
superimposed. Adjust the alignment until only one broad fringe exists.
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