ILX Lightwave LDC-3700 Series User Manual

2.13.1 LASER PARAMETER SELECT
The (PARAMETER) SELECT switch is used to enter ths SELECT mode. While the (ADJUST) LASER indicator
is lit (LASER mode selected), press the (PARAMETER) SELECT switch to enter this mode.
When the (LASER PARAMETER) SELECT mode is first entered, the LIM
I indicator becomes lit, and the unit
displays the current limit value, in mA. All LED indicators in the LASER DISPLAY switch section are turned off.
If the (PARAMETER) SELECT switch is released,
th~s state continues for three seconds, after which the unit
reverts to its former state.
If the (PARAMETER) SELECT switch is pressed repeatedly, successive (LASER) parameter values are displayed,
and the appropriate (LASER) parameter indicator LED becomes lit. The order of cycling through the
(LASER)
parameter list is LIM I (blue - low range), LIM I (black - high range), LIM P, CAL PD, then back to LIM I, and so
on.
2.13.2 LASER PARAMETER SET
The (PARAMETER) SET switch is used to enter SET mode, where parameter values are stored into non-volatile
memon.
If the (PARAMETER) SET switch is pressed whde the unit is in SELECT mode, the unit will enter SET mode.
While the (PARAMETER) SET switch is held in, the selected parameter value can be change by rotating the
ADJUST knob. The new value is stored in non-volatile memory when the (PARAMETER) SET switch is released.
2.13.3 LIM I
The LIM I parameter is used to set the absolute upper limit for LASER output current. During operation, when the
LASER current limit is reached, the
CURRENT LIMTT error indicator flashes.
If thc optional GPIB is implemented, the LASER current limit condition may
be used to turn the LASER output off
via the LASer:ENABle:OUTOFF command.
The (blue)
LIM I indicator becomes lit when the low range laser current limit is displayed. The (black) LIM I
indicator becomes lit when the high range laser current limit is displayed
The current limit setting is independent of the voltage drop of the device connected to the LASER output, and
therefore. no dummy load is required for precise adjustment of the current limit. Furthermore, since the current
lirn~t c~rcuitry is fully independent of the main current control, the current limit can be adjusted safely, even while
the LASER output
1s active.
2.13.4 LIM P
The LIM P is the absolute limit of optical power, as detected by the unit via the monitor PD feedback scheme. In
order for this limit to be meaningful. the monitor photodiode responsivity (CAL PD) must
be adjusted correctly.
See Section 2.13.5.
This limit is a software limit only. The LASER output is normally turned off
if ths limit is reached (unless this
condition to turn the LASER output off is disabled via the remote LASer:ENABle:OUTOFF command). The
rnaslmurn LIM P value is 200.0 niW (LDC-3712), 1000.0
rnW (LDC-3722B), and 5000 mW (LDC-3742B).
During operation. when the LASER power limit is reached, the POWER LIMIT error indicator flashes.
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ILX Lightwave LDC-3700 Series Specifications

General

Brand	ILX Lightwave
Model	LDC-3700 Series
Category	Controller
Language	English