QCL-LAB079 datasheet(16/29 Pages) WAVELENGTH

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ADDITIONAL CAPABILITIES

ANALOG CURRENT MONITOR

This signal is the sum of the DC setpoint as shown on the

screen and the external modulation input.

To monitor the analog current level:

1. Connect the Analog output Current Monitor (PIN 8) on the

MONITOR D-SUB to an oscilloscope.

2. Connect an Analog Monitor Ground (PIN 7 or PIN 9) to

oscilloscope ground.

SETPOINT CURRENT MONITOR

This is a reference only and can be off by as much as 5%

when setpoint is >10% of full scale.

To monitor the setpoint current:

1. Measure the voltage on the Analog Setpoint Monitor (PIN 6).

2. Ground for that measurement is the Analog Monitor Ground

(PIN 7 or PIN 9).

The setpoint monitor and analog current monitor transfer

functions depend on the QCL instrument model and are all

as follows:

QCL500-LAB:

0.1 A / V.

QCL1000-LAB:

0.2 A / V.

QCL1500-LAB:

0.3 A / V.

QCL2000-LAB:

0.4 A / V.

The input range is always 0 – 5 V.

ALIGNMENT LED DRIVE

+5 V, up to 250 mA sourced.

To drive an alignment LED, on the MONITOR D-SUB

1. Connect an LED to the Alignment LED +5V (PIN 1).

2. Ground the LED at the Alignment LED Ground (PIN 2).

ENABLE STATUS INDICATOR

This is a +5 V TTL indicator. If current to the QCL output

is enabled, the voltage between PIN 3 and PIN 4 on the

MONITORS D-SUB will be low. It will be high if current is

disabled.

USE THE TRIGGER SIGNAL

A trigger signal is provided so that external measurement

equipment can be synchronized with laser current. Exactly

10 msec after a remote change in setpoint, a 20 µsec positive

going pulse appears on the Trigger BNC plug.

To use the Trigger, connect a BNC cable to the TRIGGER

BNC output.

QCL-LAB079 Datasheet(PDF) 16 Page - Wavelength Electronics, Inc.

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