MOGlabs DLC202, Manual, Page: 32 / 82

22 Chapter 3. Operation
diode injection current supply and piezo drivers.
5. If the controller is switched back to
STANDBY
, all electronics
will be powered down, except for the temperature controller ,
which will continue to operate normally.
6. Temperature control can be optimised by adjustment of the
integrator gain, rear-panel trimpot T
gain
. Adjust to minimise
the time to equilibrate the temperature (
CHANNEL A
output,
front panel
CHAN A
set to
Temp
) after a sudden change in T
set
.
7. Adjust the current control knob to minimum (fully anti-clockwise).
8. Set the diode maximum current: select
Curr max
on the display
selector, then adjust the maximum allowed diode injection cur-
rent via the rear panel I
gain
trimpot. Note that with the display
set to
Curr max
, a negative sign ( − ) provides a visual reminder
that the limit is being displayed rather than the actual current.
9. Switch the laser on. The indicator on the laser head board
should illuminate, and the front-panel indicator above the switch
should turn green.
Note that the
SCAN
/
LOCK
and fast-channel
OFF
/
LOCK
switches must
be set to
SCAN
and
OFF
respectively. Other protection features will
prevent current to the diode, including main cable disconnect, and
open circuit on the rear-panel or laser head interlocks.
3.2 Laser frequency control
High voltage (120 V; 150 V optional) outputs are provided for piezo-
electric actuators to control the frequency of an
ECDL
. These should
be connected to the laser head board via the provided
MOLEX
con-
nectors.
Critical signals can be monitored using the
CHANNEL A, B
outputs on
the rear panel, synchronised to the
TRIG
trigger output. These sig-
nals should be connected to the equivalent inputs on a two-channel
oscilloscope. The particular signals are selected from the front-panel
CHAN A
and
CHAN B
selector switches.