Specifications
Diamond™ GEM, G, & K, Integrator’s Guide
40
warning message if this signal stays high more than 1 millisecond.
The control should wait 100 milliseconds after modulation starts to
monitor the forward power to allow transients to dissipate.
Duty Cycle Limit (Pin 10+, Pin 23–)
The duty cycle is the ratio of the pulse width to the pulse interval.
Each model of the Diamond laser has a specified maximum duty
cycle. The Duty Cycle Limit signal goes high if the incoming duty
cycle exceeds the laser’s limit, or if the incoming pulse duration
exceeds 1000 µs. Note that the power supply limits its output to
allowable conditions; a Duty Cycle Limit signal indicates that there
is a difference between the commanded output and the actual output.
VSWR Limit (Pin 11+, Pin 24–)
The VSWR (voltage standing wave ratio) limit signal is issued when
the ratio of the reflected RF to the forward RF exceeds a preset limit.
This signal is momentary; its duration is on the order of the pulse
width. The control should wait 100 milliseconds after modulation
starts to monitor the VSWR limit to allow transients to dissipate.
The normal practice with all of these warning signals is to indicate
the warning on the system control until a reset is commanded to
clear them.
Water Flow Switch
Low water flow is a system fault. A low water signal from the flow
switch should be interpreted as such and prevent laser operation
until the fault is cleared.
Shutter
If an electrically-controlled shutter is used, it should be interlocked
to the system control so that it closes whenever a safety interlock is
opened. Shutter position should also be monitored, indicating a fault
condition if the commanded position is not achieved after a short
time. If a manual shutter is used, opening any safety interlock must
disable the RF amplifier.
DDI Interface
The Diamond Digital Interface, used on Basic and Performance
lasers, simplifies system connection and status monitoring. With the
DDI, the system control need only communicate with one device
rather than four. All connections except for external interlocks are
made through a single DB37 plug (J1 on Basic systems, Controller