LDTC-LAB datasheet(15/31 Pages) WAVELENGTH

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ENABLE/DISABLE OUTPUT

CURRENT

On the front panel, the LDD Enable and TC Enable buttons

dictate whether or not output current is enabled.

To enable either the LD or the TC current, push the

corresponding button on the front panel. If output current is

enabled, the LED will be lit (red for laser, blue for temperature

control). There is no time delay before temperature output

current is enabled after pushing the button. By default, there

is a 2 second delay after pushing the LDD Enable button for

current to be output to the laser.

To disable current, press the corresponding Enable button

again. Once the button is pushed, current will immediately

disable, and the LED will become dark.

DISPLAY EXISTING CURRENT

AND VOLTAGE VALUES

Press to access the Dual Monitor Screen.

Values on this screen cannot be changed and

are for information only.

Figure 21. Dual Monitor Screen

LD Current, LD Voltage, PD Power or PD Current (see

Note below), and PD Bias Status are the laser parameters

displayed. Temperature control parameters displayed

include Actual Temperature, Sensor Voltage, TE Current

(appropriately signed), and TE Voltage. If the temperature is

within the defined tolerance, the target icon will be visible.

NOTE: PD Current is displayed here if the PD Transfer

Function (specified on the Photodiode Screen) is zero (OFF).

PD Power is displayed here if the PD Transfer Function is

nonzero.

DISABLE CONDITIONS

If certain operational parameters are exceeded or improperly

configured, output current to the LD and/or TC will be disabled.

Using the LASer:ENABle:OUTOFF remote command, the

instrument can be configured to disable laser current if certain

temperature conditions are not met. See

"Independent/

Linked Operation" on page 27 for more information.

• Load Open/Short:

The instrument will detect if there are open or shorted

conditions across either the LD or the TC connections.

The TC portion of the instrument will continue to

operate if the laser portion malfunctions. Whether

or not the LD portion of the instrument continues to

operate if the TC portion malfunctions can be set by

the user via remote commands.

• Over- or Under-Temperature:

If the temperature limits that are set by the user

are exceeded (either high or low), current to the

thermoelectric will be disabled. Current to the laser

can be disabled via remote commands.

• Over- or Under-Voltage:

The LDTC LAB monitors the power supply voltages

and triggers an error and shuts off the output if the

internal power supplies are out of a pre-determined

range.

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