LDTC-LAB datasheet(27/31 Pages) WAVELENGTH

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ADDITIONAL TECHNICAL NOTES

This section includes useful technical information on these

topics:

• Using the Max Laser Voltage Limit

• Use Passive and Active ld Interlocks

• Clipping LD Current Limit

• Independent/Linked Operation

USING THE MAX LASER VOLTAGE

LIMIT

The Maximum Laser Voltage field can be used as a safety

feature, and a compliance voltage indicator. If the voltage

across the laser attempts to breach the set limit, the instrument

will present an error to keep the laser from operating in

compliance voltage limited mode (not being able to achieve

the full requested output current).

USE PASSIVE AND ACTIVE LD

INTERLOCKS

The passive interlock is designed to trigger if Pins 2 and 3 on

the LDD D-SUB are not shorted. Use this interlock with doors

and enclosures that trigger an open circuit when opened.

The active interlock (ACTIVE LOCK BNC) can be used with

another active system component to disable/enable the LD

current output.

CLIPPING LD CURRENT LIMIT

The LDTC LAB utilizes a clipping LD current limit. This means

that at a current level very near the current limit, the instrument

will clamp the output current at the limit, and continue

operating at that level of output current. Output current will not

be disabled if the limit is reached.

INDEPENDENT/LINKED

OPERATION

The LDTC LAB can operate with the LD and TC sides

independent of one another, or tied. If tied operation is

chosen, the user can choose which TC errors will trigger a

LD output current disable using the Laser Enable Output Off

This register is defined below, in

Table 7.

DECIMAL

HEXADECIMAL

TC CONDITION

0x0001

Output disabled

0x0002

TEC short

0x0004

TEC open

0x0008

Temperature not stable

0x0010

Sensor short

0x0020

Sensor open

0x0040

Over-temperature

128

0x0080

Under-temperature

Table 7. Laser Enable Output Off register definitions

Each bit can be individually set. For example, if laser

current needs to be shut down if there is a disconnection

of the temperature sensor or if the temperature exceeds

the maximum temperature limit, the set value would be 96

(sum of 32 for a sensor open condition and 64 for an over-

temperature condition). Sending the remote command

LAS:ENAB:OUTOFF 96 specifies this shutdown condition.

By default, this register is set to zero, configuring for

independent operation.

For more information, see the LAB Series Instrument

Command Set document.

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