Control Mode And Current Range; Modulation - ILX Lightwave LDX-3500 Series User Manual

Conditions Which Will Automatically Shut Off the OUTPUT
• 1. Interlock/ENABLE Key Lock State open
• 2. Open Circuit (While Output On)
• 3. Switching Ranges or Modes (While Output On)
• 4. Internal Overheating Sense Switch (LDX-3565 only)

Control Mode and Current Range

The MODE switch is used to select the output control mode. Repeatedly pressing
the MODE switch cycles through the current (I CW), high bandwidth current (I
HBW), and light power (P) control modes. The LED indicators show the selected
mode. Changing the control mode forces the output off.
The RANGE switch is used to switch between the high and low laser current
output ranges. Switching ranges forces the current output off.

Modulation

The MODULATION connector (BNC) allows a modulation signal to be applied to
the output. The bandwidth depends on the selected current range and bandwidth
mode (see specifications, Chapter 1). Bandwidth specifications are measured
across a 1 Ω load. The modulation port input impedance is 10 kΩ. The transfer
function (mA/V) in Figure 2.1 is shown for the LDX-3525. This transfer function
varies by model and laser drive current output range, as shown in Table 2.1.
Model
LDX-3525
LDX-3545
LDX-3565
Table 2.1 Modulation Transfer Functions
The error indicators become lit when the corresponding conditions occur. The
INTLK/ENBL light comes on whenever the back panel ENABLE switch or the
interlock connections (pins 1 and 2 of the 9-pin connector) are open.
The OPEN/V LIM indicator becomes lit whenever an open circuit (or a high
impedance condition) occurs on the output when the output is on. When the
OPEN/V LIM condition occurs, the output will be shut off and the indicator will
remain on until the problem is resolved and the output is turned on again. The
OPEN/V LIM indicator blinks at 1 Hz whenever the output voltage is near its
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I N S T A L L A T I O N A N D O P E R A T I O N
Introduction to the LDX-3500 Series Front Panel
Low Range
20 mA/V
100 mA/V
200 mA/V
High Range
50 mA/V
300 mA/V
600 mA/V
LDX-3500 Series
2
C H A P T E R
15