02001346 Rev 1
HPP-1000/6000 User Manual
Page 15 of 19
11.
Operation of the HPP
1.
Connect diode laser load to the HPP. A custom strip line cable has been supplied to
minimize inductance. Please note the cable is marked with (+) and (-) labels. Do not
extend output cable or performance will be compromised.
2.
Connect appropriate interface to HPP Interface Connector. Make sure
Ip)
,
pin 6, is set to 0.0V.
3.
Connect HPP to the feeding DC power supply which is OFF.
4.
Turn ON the feeding DC power supply. Increase DC output voltage and the HPP will
start when it sees appropriate DC voltage. After a few seconds the cooling fan should
begin to operate.
5.
Set
Ip),
Pin 6 of the interface connector,
This signal is the 0-10V program
which will program the output current level. Calibration is set so that 0-10V = 0 –
Iout
max
.
6.
Enable
the output by applying a TTL level high signal to pin 14 of the interface
connector. The
Enable
control checks for faults and prepares the system for pulsing.
7.
Pulse the unit via the
Pulsing Input
control, pin 1. Maximum pulse widths should
not be greater than specified on the system label. The amplitude of the pulses will be
determined via the analog
Ip)
signal. Maximum average power delivered
to the load should not exceed the rated power capability of the unit.
Unit Faults
The unit is designed to monitor various faults such as:
•
Temp Fault
:
(Output, TTL, Pin 4)
When the temperature of the internal heat sink
has exceeded a safe operating level, the system is shut off and this fault is transmitted.
Fault output is TTL high. Fault can be cleared by setting the
Enable
, pin 14, to TTL
low and then high.
•
Poor load match
:
(Output, TTL, Pin 7)
When the voltage compliance of the diode
laser load is 8V lower than the DC input voltage. This fault may be cleared via the
Enable
signal.
Warning – Voltage Compliance Requirement
Each HPP is custom configured to deliver current pulses into a diode array requiring a
predefined compliance voltage.
See the Serial Number label of the unit for the compliance voltage rating. The HPP
takes DC input voltage and will not operate properly when the input is great than 10V
higher than the load compliance voltage and will not start when the input is 20V lower
that the rating on the S/N label or lower than 20V.
Consult factory more wider operating window.
Warning – Output Floating
The output of the HPP is floating and therefore, neither side of the laser diode is
allowed to be connected to the same ground as signal ground (Program, Monitor).
