Gentec-EO SDX-1239 User manual

SDX-1239 Operating Instructions
Rev - 3/21/2017 Page 1 of 22
SDX-1239 Energy Meter
Operating Instructions

SDX-1239 Operating Instructions
Rev - 3/21/2017 Page 2 of 22
Contents
Introduction ....................................................................................................................... 3
Installing the USB Driver ................................................................................................. 4
Power Source ..................................................................................................................... 7
Probe Connection .............................................................................................................. 7
Indicator LED’s ................................................................................................................ 8
USB ..................................................................................................................................... 8
AOM Voltage ..................................................................................................................... 8
Energy Voltage .................................................................................................................. 8
ARM Control ..................................................................................................................... 8
Turning the Unit On ......................................................................................................... 9
Power on Tests................................................................................................................... 9
SDX-1239 Function ........................................................................................................... 9
SDX-1239 Pulse Width Correction................................................................................ 11
SDX-1239 AOM Control in Control Mode ................................................................... 11
SDX-1239 Commands ..................................................................................................... 12
Reading SDX-1239 Data ................................................................................................. 18
Reading SDX-1239 Pulse Memory ................................................................................ 20

SDX-1239 Operating Instructions
Rev - 3/21/2017 Page 3 of 22
Introduction
Figure 1 shows the SDX-1239 front panel. Figure 2 shows the SDX-1239 back panel.
Figure 1, SDX-1239 Front Panel
Figure 2, SDX-1239 Back Panel

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Installing the USB Driver
Do not plug the SDX-1239 into your PC yet.
The USB Drivers for the SDX-1239 are the same as are used for the Mach 6 Joulemeter.
The can be downloaded from the Gentec-eo website.
https://www.gentec-eo.com/downloads
These drivers are not certified by Microsoft. The will need to be installed with driver
signing enforcement turned off.
How to Disable Driver Signature Verification on 64-Bit Windows 8.1 or 10
To disable driver signature verification, we’re going to need to get into the
Troubleshooting options from the boot manager. Simply select Restart from the
power options menu (on Windows 8 that’s under Charms or on the login screen, and
in Windows 10 it’s on the Start Menu).
Hold down the SHIFT key while you click Restart.
(Again, you can use this trick on any of the power menus in Windows 8 or 10,
whether on the login screen, Charms bar, Start Menu, or Start Screen)
Once your computer has rebooted you will be able to choose the Troubleshoot
option.

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Then select Advanced options.
Then Startup Settings.

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Since we are modifying boot time configuration settings, you will need to restart
your Computer one last time.
Finally, you will be given a list of startup settings that you can change. The one we
are looking for is “Disable driver signature enforcement”. To choose the setting, you
will need to press the F7 key.

SDX-1239 Operating Instructions
Rev - 3/21/2017 Page 7 of 22
Your PC will then reboot and you will be able to install unsigned drivers without any
error message
Power Source
The SDX-1239 system is supplied with a 10V, 1.5A universal power module. It will
accept voltages from +9V to +15V provided they supply at least 1A and the plug is
5.5mm outer diameter, 2.1 mm inner diameter, and 11mm in length, with the center being
positive. Plug the supply into the DC power jack located on the front panel.
Probe Connection
The SDX-1239 probes use a 7-pin locking connector. Plug in the probe by lining up the
red reference dots and pushing the connector until it latches into its locked position. To
remove the probe, power down the unit and pull on the outer sleeve. The connector will
unlock and disengage.

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Indicator LED’s
There are 4 LED’s on the SDX-1239 front panel as shown in figure 1.
The Power LED is illuminated whenever an external supply is plugged into the DC
power jack.
The Trigger LED illuminated when the SDX-1239 is triggered. This LED functions at all
times, whether the SDX-1239 is armed or not.
The Armed LED illuminated when the unit has been armed for data collection. Note that
the unit can be armed even if no triggers are present.
The Out of Range LED illuminates when the internal ADC detects a voltage outside of its
measurement range. This LED is only updated when the unit is armed and triggered.
USB
The SDX-1239 communicates with the host PC via a USB port. The device supports full
speed USB 2.0. The host P.C must have the Mach 6 USB drivers installed. These drivers
are on Gentec-eo website. The USB cable can be unplugged from the SDX-1239 during
operation at any time, but the applications software will not function in this state other
than to wait for a SDX-1239 to be connected to the USB.
AOM Voltage
The AOM Voltage Output provides a buffered signal from the SDX-1239. The range is
0V to 1V. In Measure and Monitor Mode, this voltage is set via USB commands. In
Control mode, this voltage is set by the SDX-1239 to minimize the error between the
target energy and the measured mean energy.
Energy Voltage
The Energy voltage is set by reading the valve of the voltage on the BNC. The input
range is 0V to 10V. 0V represents 0% of the set scale, and 10V represents 100% of the
set scale.
ARM Control
SDX-1239 will arm for measurements when this signal is set to 3V (TTL compatible) or
higher. The ARM Control signal is tested at the AOM update rate. This will be 10Hz to
10kHz

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Turning the Unit On
Before turning the SDX-1239 on, be sure that the probe in use is plugged in. When the
SDX-1239 powers up, it reads the probe memory to obtain required information for
correct operation. SDX-1239 cannot detect a probe removal, so hot swapping the probe is
not permitted. Doing so will not cause damage, but the probe information will not be
updated. Once the probe and power supply are connected, turn the unit on by setting the
Power Switch to ON. The Power LED will illuminate. The remaining LEDS will turn on
briefly as the SDX-1239 performs internal self-tests, then they will turn off. The SDX-
1239 is now ready to use.
Power on Tests
When powered on, the SDX-1239 tests its internal memory and its control circuitry to
ensure it can accurately measure data. If the internal memory fails its test, the SDX-1239
will flash the Over Temp LED. If the control circuitry fails its test, the SDX-1239 will
flash the Over Temp LED. Should either of these conditions occur, contact GENTEC-EO
for service of the unit.
SDX-1239 Function
The SDX-1239 is a control system to monitor the energy of the laser. The block diagram
of the system is shown in figure 3.
Figure 3, SDX-1239 Control System

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The SDX-1239 supports 3 modes of operation:
1. Measure Mode.
a. This is the same as Live Mode used on Mach 6. ARM BNC3 will control the SDX-
1239.
b. The AOM control voltage on BNC2 will be set with USB commands from the PC
software.
c. Every 100ms the SDX-1239 will send the most recent energy measure to the USB
2. Monitor Mode.
a. The AOM control voltage on BNC2 will be set with USB commands from the PC
software.
b. The target energy will be read from BNC1.
c. The tolerance of the measurement will be set using the USB commands from the PC
Software.
d. The SDX-1239 will stabilize at the requested target energy and tolerance within 1
second.
e. BNC3 will control the SDX-1239. If it is high, measurement will continue. If it is low,
measurement will stop
f. When measurement is stopped by the signal on BNC3, the last AOM control voltage
on BNC2 will be held unchanged.
g. The SDX-1239 will measure for a minimum of 2 hours at pulse repetition rates up to
90kHz.
h. Every 100ms, the SDX-1239 will send statistics as defined in the spec to the PC
software, and the statistics will restart a new batch.
3. Control Mode.
a. The AOM control voltage on BNC2 will be set by the SDX-1239 based on the error of
the measured mean energy and the target energy.
b. The target energy will be read from BNC1.
c. The tolerance of the measurement will be set using the USB command from the PC
Software.
d. BNC 3 will control the SDX-1239. If it is high, measurement will continue. If it is low,
measurement will stop
e. When measurement is stopped by the signal on BNC3, the last AOM control voltage
on BNC2 will be held unchanged.
f. The AOM Control voltage will be updated at a rate between 0Hz and 10kHz.
g. The AOM control voltage update rate will be set with the USB command from the PC
Software.
h. Every 100ms, the SDX-1139 will send statistics as defined in the spec to the PC
software, and the statistics will restart a new batch.