QCL-LAB079 datasheet(13/29 Pages) WAVELENGTH

13 / 29 page

TURN ON QCL INSTRUMENT

1. Press the

Power switch on the back panel to |. The front

panel power button light slowly pulses.

2. Press the

Power button on the front panel, the button

illuminates, touchscreen is activated, and the Control

screen is active.

NOTE: Turning off front

Power button powers down the

application electronics and puts the unit into standby

mode. Turning off rear

Power switch powers down all

electronics and settings return to factory default.

3. The front panel displays dashes instead of digits until the

unit has finished its power-up sequence (~10 seconds).

SET LIMITS

1. Press to access the Limit Screen.

2. Press

Limit Current, Maximum Supply Voltage, and/or

Cable Resistance values and rotate the Adjustment knob

to change each value. The instrument will beep when set.

Figure 15.

Limit Screen

NOTES:

•

The

Limit Current should not exceed the damage current

threshold of your QCL.

•

The

Maximum Internal Supply Voltage can be lowered

to minimize internal instrument temperature or to act as a

compliance voltage clamp on the QCL output current. See

Additional Technical Notes on

page 25 for optimization

instructions.

•

The

Cable Resistance range is 0 – 4 Ω.

QCL Voltage displays the voltage at the QCL DSUB or

SMA terminals. To account for voltage loss across the

cable to the QCL, you can enter a non-zero value for

Cable Resistance.

The QCL Voltage will now display as:

Voltage Displayed = Voltage@Pins - (Cable Resistance x Operating Current)

•

The minimum limit current is about 8% of full scale.

ADJUST THE SETPOINT

1. Press to access the Control Screen.

2. Press the

Setpoint value and turn the Adjustment knob

until the desired operating current is displayed.

Figure 16.

Control Screen

NOTE: The Control screen is on by default when the

instrument is turned on. The Mode is Constant Current by

default and cannot be changed.

DISPLAY EXISTING CURRENT AND

VOLTAGE VALUES

Press to access the Monitor Screen.

Values on this screen cannot be changed and are for

information only.

Figure 17.

Monitor Screen

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