www.teamWavelength.com
© 2010
QCL500, QCL1000, QCL1500 Low Noise Quantum Cascade Laser Drivers
PAGE 11
QCL1500-00400-D
5. Setup Monitors
Attach a DVM or other voltage monitoring device to the Current Monitor (Pin 10) and Limit Monitor
(Pin 11). Reference to Monitor Ground (Pin 12). Transfer functions are:
Examples:
QCL500 - 2.5 V on the Current Monitor pin, equivalent current is (2.5 V * 0.2 A / V) or 500 mA.
QCL1000 - 1.8 V on the Current Monitor pin, equivalent current is (1.8 V * 0.4 A / V) or 0.72 A.
QCL1500 - 2.0 V on the Current Monitor pin, equivalent current is (2.0 V * 0.6 A / V) or 1.2 A.
QCL500 - 5 V on the Limit Monitor pin, equivalent limit current is (5 V * 0.09 A / V) or 450 mA.
QCL1000 - 2.5 V on the Limit Monitor pin, equivalent limit current is (2.5 V * 0.19 A / V) or 470 mA.
QCL1500 - 3.2 V on the Limit Monitor pin, equivalent limit current is (3.25 V * 0.28 A / V) or 910 mA.
6. Power up the unit
Turn on power to the DC supplies. Flip the POWER ON switch to ON. The POWER ON LED lights. If
the LED does not power on, review REMOTE vs. LOCAL switch settings (Step 4) and the state of the
REMOTE POWER ON signal (Pin 4 referenced to Pin 3).
7. Set Current Limit & Zero Output Current
Choose Current Limit current to be above the normal setpoint, but below the damage threshold of
the QCL. Monitor the Current Limit (between Pin 11 & 12). Rotate the Current Limit Setpoint trimpot
clockwise to increase the limit current setting. Example conversions:
QCL500 - Want 425 mA Limit, equivalent voltage is (0.425 A / 0.09 A / V) or 4.7 V.
QCL1000 - Want 750 mA Limit, equivalent voltage is (0.750 A / 0.19 A / V) or 3.9 V.
QCL1500 - Want 1.5 A Limit, equivalent voltage is (1.5 A / * 0.28 A / V) or 5.3 V.
Rotate the SET trimpot on the front panel completely counter clockwise to zero the output current
setpoint.
OPERATING PROCEDURES, continued
Model
QCL500
QCL1000
QCL1500
Limit MON
0.09 A / V
0.19 A / V
0.28 A / V
Current MON
0.2 A / V
0.4 A / V
0.6 A / V
• Power On: Switch and indicator
• Enable Current: Switch and indicator
• Over Temperature Fault indicator
• Current Setpoint trimpot
• Current Limit Setpoint trimpot
QCL1500
01A105409201
Covered by U.S.
Patents 6,696,887;
6,867,644 and
7,176,755