QCL-LAB161 datasheet(18/24 Pages) WAVELENGTH

18 / 24 page

PROBLEM

POTENTIAL CAUSES

SOLUTIONS

Noise current is higher than expected.

There may be ground loops in the

system; some system components

may be higher noise than expected;

cabling and shielding may be

inadequate.

Refer to Wavelength Electronics Application

Note AN-LD08: Manage Grounding to

Minimize Noise with the QCL Drivers:

www.teamwavelength.com/download/

applicationtechnotes/an-ld08.pdf

Also reference AN-LD09: Troubleshooting

Low Noise Systems:

www.teamwavelength.com/download/

applicationtechnotes/an-ld09.pdf

The output switched off unexpectedly

The instrument detected an internal

error.

(See

Error Messages on page 19.)

Switch the back panel power button off and

then on again, and turn the front panel power

button on.

The internal temperature has

exceeded 70ºC.

Allow the instrument to cool down and then

press the front panel power button.

20 kHz noise is in the output current

QCL driver is operating in current limit.

If safe for the quantum cascade laser,

increase the output current limit setting.

When actively operating in current limit, the

safety circuits add noise to the output.

If I run my QCL at about 5% of maximum

output current, the transfer function

becomes non-linear and I see distortion in

my output current waveform.

QCL driver resolution is too low.

Select a QCL driver with a much lower

maximum output current. For example,

to run 50 mA, request a QCL125 (125 mA

maximum output).

My instrument doesn’t show up in the list.

(

Remote Only)

Your instrument may not be turned on.

Power up the instrument and click

Refresh

on the

Choose Instrument window.

Your instrument may not be plugged in

to the computer.

Check that either a USB or Ethernet cable is

tightly connected to the instrument and to the

computer.

Your instrument may be on a different

sub-net.

Add the sub-net to the

Choose Instrument

window and then click

Refresh.

Actual current does not match the setpoint.

The setpoint exceeds the limit current

setting.

If the limit current can be increased without

damage to the QCL, increase the limit

current setting.

The QCL is compliance voltage

limited.

Increase the Max Supply Voltage slightly to

see if actual current increases. Follow the

instructions on

page 20 to optimally set

the Max Supply Voltage.

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