2.1 Preparation for Use
2 – 3
and returning through pins 3 and 4. This circuit may carry as much
as
±
4.5 A at full current. Be careful to wire the TEC sense connection
(pins 10 and 12) independently to the TEC module, so that ohmic
drops across the current-carrying leads does not introduce errors in
the TEC voltage sensing.
The temperature sense circuit is ideally suited to 4–wire (Kelvin lead)
connection. Satisfactory results, however, may still be obtained in
some cases by leaving the sense leads (pins 14 and 15) disconnected.
If possible, better results will be obtained by connecting pin 14 to
pin 7, and pin 15 to pin 8, ideally as close to the sensor as practical.
Some improvement is still obtained even if the connection is made
at the DB–15 connection at the LDC500 rear panel.
2.1.4
Checking wiring
Before installing your laser diode into the laser diode mount, it is
important to verify that all wiring is correct. This is especially im-
portant with laser mounts that have user-configurable connection
schemes. A good way to test the connections is to verify continuity
(by “beeping”) using a hand-held multimeter. Figure 2.4 shows an
an example, in this case with a butterfly package mount.
LDC500 Series Laser Diode Controllers
