QCL-LAB079 datasheet(16/29 Pages) WAVELENGTH

16 / 29 page

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.

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