PCI-FPGA-1B User Guide - Port City Instruments
Contents
1. Port City Instruments LLC SINGLE LINE SPECTROSCOPY SOLUTIONS PCI FPGA 1B User Guide Rev 1 0 Nov 2012 Port City Instruments LLC 8209 Market Street Suite A271 Wilmington NC 28411 Tel 866 456 2488 Web www portcityinstruments com Copyright 2012 Port City Instruments LLC All Rights Reserved This document may not be copied disclosed transferred or modified without the prior written consent of Port City Instruments LLC Port City Instruments LLC assumes no responsibility or liability for any errors or inaccuracies that may appear in this manual Port City Instruments LLC reserves the right to modify the products and product specifications described in this manual without advance notice Port City Instruments LLC is not responsible for any direct indirect or consequential damage or liability caused by improper use of this manual or the product Trademarks The trademarks logos and service marks displayed in this manual are the property of Port City Instruments LLC or other third parties Users are not permitted to use these marks without the prior written consent of the company All other trademarks mentioned in this document are the property of their respective owners Document Change History Rev Date Changes 1 0 November 2012 Initial Release for Rev B PCI FPGA 1A board 1I IN FRODUCTION cesiesiss cescctacesdestsdsesnnsacesdostscsescadacectectstsenanaaceccsststc2. NOTE All screw terminal blocks can be removed for easier access using the two screws at either side of the connector block 3 2 USB rear panel A standard type B USB port is provided on the rear panel for connection to a PC for flash programming NOTE If you have not already installed the driver for the control board s UART please follow the instructions in the PCI FPGA 1A manual and configure the laser scan parameters and 2f demodulator parameters prior to connecting a laser to the system A compatible USB cable is included with the module It will mate to any type A USB port on a PC Note a type A USB connector is the thin rectangular port commonly used on desktop and laptop PCs type B is the D shaped connector on the rear of the 1B module 3 3 Temperature Sensor Inputs rear panel Thermistor and PRTD inputs are provided on standard screw terminals via a 10 pin terminal block on the rear panel As indicated by the labels below the terminal block the thermistor inputs are in pairs from left to right with the rightmost four locations reserved for a 4 wire PRTD Temperature Sensor Inputs Although thermistors have no inherent polarity the control board ties one GND Ti GND 12 GND 13 PRTD PRTD PRTD PRTD side of the thermistor to COM BIAS ground the leftmost terminal of each pair PCI FPGA 1B 4 Port City Instruments LLC Refer to the diagram above for details and always ensure that stripped w
3. this manual Appendix A Temperature Sensor Outputs GND Ti GND T2 GND 13 PRTD PRID LOFF LOFF The rightmost two terminals are reserved for an external laser ON OFF control input The LOFF signal is a digital or analog input signal 3 3V LVTTL up to 5 0V TTL used to disable the laser drive current exactly as is done with the toggle switch next to the laser drive output BNC A positive signal here disables the laser drive and a ground level signal enables the laser drive If the laser drive toggle switch is placed in the OFF down position external signal Port City Instruments LLC 7 PCI FPGA 1B input via the LOFF pins can be used for the same function This way the laser ON OFF function can be controlled by an external signal for situations where that is desired NOTE When the laser drive toggle switch is in the ON up position the laser drive may be passed to the laser independent of any input to LOFF above Do not make connections to the LOFF pins if the toggle switch is used and make sure the toggle switch is in the OFF down position if the LOFF external input is used 3 10 Pressure Sensor I O front panel The 1B module provides a 5 00V bias and front panel input connector for an amplified pressure sensor whose output is in the 0 5V range the default configuration for the 1B module These types of pressure sensors typically produce an output signal in the 0 25 to 4 75V or 0 50 to 4 50V with a 5 0V bia
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5. e output is linear but should be calibrated for any offset that may be present Specify at the time of order or contact us if already received for instructions on how to convert this input terminal for an unamplified sensor which type of pressure sensor will be used as there is some internal cable rerouting required to use 0 100 mV unamplified sensors The default configuration is for the use of amplified pressure sensors having an output within the 0 5V range Pressure Sensor I O ce Connections for unamplified an a Ea a pressure sensor PCI FPGA 1B 8 Port City Instruments LLC Appendix A Conversions A 1 Sensor conversions Thermistor Conversion Rt 22 49 Vin 7 0 2 8112 Vin where Rt is the thermistor resistance in Kohm and Vin is the output voltage provided by the PCI FPGA 1A board The useful range of thermistor resistances is between approximately 0 125 Kohm Vin 0 325V to 488 Kohm Vin 2 701V Outside of these ranges the change in Vin with respect to Rt is either very large higher resistances or very small lower resistances For a typical 10 Kohm 25C thermistor with a beta value near 3900 this represents a temperature range of roughly 45C to 165C with larger errors at the extremes of the range especially the high temperature end where Rt is very small Make sure to use a thermistor with a resistance value within the above range for valid output values and match it to the best p
6. e sensor conditioning The company is located in Wilmington North Carolina USA 1 2 Product overview The PCI FPGA 1B module contains our PCI FPGA 1A spectrometer controller board and provides easy connections to the board s functions This module is cable compatible with the PCI FPGA 1C data acquisition and display module which can be used for real time graphical display and logging of spectra produced by 1B module This manual describes the signal connections to from the 1B module only Please consult the PCI FPGA 1A user manual included or available for download from our website for full descriptions of the circuit board and functions of the various jumpers and options accessible directly on the controller board The default setup is for a DFB laser and InGaAs detector 2 5V reverse biased Figure 1 Front panel containing detector input connections laser drive output and outputs for spectra triggers temperature and pressure signals Port City Tim t Figure 2 Back panel Instruments LLC F aaa i containing a DIP switch for PCI FPGA 1B 7 time constant selection USB type B port for flash programming and screw terminals for power input and temperature sensor inputs Port City Instruments LLC 1 PCI FPGA 1B 2 Software Installation 2 1 Flash Programming Before the system can be used you must install the flash programming software as described in the PCI FPGA 1A manual 2 1 0 Location of the software and inst
7. erformance over the full temperature range of the application Pressure sensor conversions absolute P sensors Sensor Conversion Amplified sensor No conversion The board outputs the sensor voltage from the absolute pressure sensor with no amplification or scaling Unamplified 0 100 mV Linear output 0 to Pmax 0 to Vmax where Vmax is 3 5V sensors nominal and Pmax is the upper limit of the pressure sensor Each pressure sensor should be calibrated with the board for precise determination of Vmax and any DC offset that may be present PRTD conversion Rprt 495 52 Vin where Rprt is the resistance of the PRTD and Vin is the voltage output from the PCI FPGA 1A board Conversion of Rprt to temperature can be accomplished using the appropriate calibration curve for the PRTD being used Port City Instruments LLC 9 PCI FPGA 1B
8. iaisvebadusevebssevedebadasevebadevevebadisevebesevedebalassdebasavesstadeaevelaieievelaes 6 3 7 SPECTRUM OUTPUTS FRONT PANEL cea a E E E E E E 7 3 8 TRIGGER OUTPUTS FRONT PANEL erreroecereciricired dottir e cete Eata AEAEE ETATE TEE EEEE EEEE EE T 3 9 TEMPERATURE SENSOR OUTPUTS FRONT PANEL cccsesssssseceeeeeeseessneeeeececeseseseeeeeecceesessaeeeeeeseesnssaeeeeees 7 3 10 PRESSURE SENSOR I O FRONT PANEL 000sssseeseseesseseseseseseseseseseseeesesesesesesesesesesessseseseteseseteseseeeseeeees 8 APPENDIX A CONVERSIONS aidisssiancesssdstcscescesccesssetdasesconcsessteccsooateasebssesseacscesessssesaceoesseeesesessbsecssssecseete 9 Ail SENSOR CONVERSIONS iisisssesccssssssdsasecetscsssteessonssetsssvsvsessocscocsssssssecoosssesdseeseasesessssssssestancsesscetdsseenousseeds 9 PRESSURE SENSOR CONVERSIONS ABSOLUTE P SENSORS ccccccccsssseeeecccceeceessseeecccceeeaaeneecccceeeeuanseeeeceesseeueeeeceees 9 PRID CONVERSION aeea E E r A O E 9 i PCI FPGA 1B 1 Introduction 1 1 Company overview Port City Instruments LLC provides scientific and engineering instrumentation and support services for industrial university and government researchers working in the fields of single line spectroscopy for gas detection Products include tunable diode laser spectrometer controllers board level and packaged custom research grade laser hygrometers and other laser based gas sensors and accessory boards for thermal control and pressur
9. ing PCI FPGA 1B 6 Port City Instruments LLC used and quantify the amplitude of the current ramp observed voltage divided by 10 ohms before connecting a laser to the system 3 7 Spectrum Outputs front panel The DC laser power and 2f spectra are output on two BNC connectors located on the front panel Connect these to an oscilloscope for real time viewing of the spectra Signals are in the 0 5V range with common ground reference at 2 5V for the DC spectrum The BNC shrouds are tied internally to the 5V power supply ground 3 8 Trigger Outputs front panel Separate triggers 0 3 3V low voltage TTL are provided for synching to external data acquisition systems e Trig DC is coincident with the start of the laser scan waveform e Trig 2f is coincident with the temporally delayed 2f signal see 1A manual Both triggers are approximately 110 us in duration The time delay between these two trigger pulses is caused by the FPGA processing of the 2f signal This varies with the bandwidth setting which generally should not be changed from the default See the 1A manual for additional details 3 9 Temperature Sensor Outputs front panel The thermistor and PRTD signals that are input on the rear panel connector see Section 3 3 are output on this connector Conversion of these voltages to resistance and subsequently to temperature based on the sensor s specifications is described in the 1A manual and at the end of
10. ires are inserted fully and tightened down properly For a 4 wire PRTD it is customary to connect the COM and lines together and the BIAS and lines together if the PRTD element has only two leads 3 4 Time Constant Selection rear panel A 4 position DIP switch allows you to select one of four demodulator output time constants values in ms are indicated on the panel Push the desired DIP switch upwards to select that time constant value NOTE These time constants are additive so that higher time constants are possible by selecting more than one switch For example if the 4 1 ms and 1 9 ms switches are both turned ON the time constant will be 6 0 ms Refer to the 1A manual for implementation of a custom time constant value This requires soldering a capacitor onto a blank space on the circuit board and turning all of the DIP switches to the OFF down position 3 5 Detector Inputs front panel The 1B module is compatable with both InGaAs 0 7 to 2 6 um and InAs 1 0 3 8 um detectors It is also possible to use certain TE cooled HgCdTe detectors to cover wavelengths out to gt 12 um via connection to the InAs detector input In particular the TE cooled detectors from Vigo http www vigo com pl index php en are compatible with this controller board Detector connections are made via the 0 1 headers on the front panel Refer to the Detector In put diagram to the right for correct polarity for each detec
11. l and is located adjacent to a toggle switch which must be in the ON up position to allow current to flow through the laser Always keep this toggle switch in the OFF down position until a known good laser drive waveform is confirmed Laser current is applied to the laser only if the switch is ON up i Always Confirm Waveform Characteristics Before Connecting a Laser Reversing the polarity of the drive signal or applying too much current to the laser can ALERT damage or destroy the laser To confirm the characteristics of a programmed laser scan waveform 1 Connect a 10 ohm 1 2W resistor across the laser drive BNC connector 2 Flip the laser ON OFF toggle switch to the ON up position 3 Use an oscilloscope to monitor the waveform across this 10 ohm dummy laser but DO NOT GROUND the negative external shroud of the BNC connector Instead connect the scope probe negative lead to the 5V power supply ground and use the positive scope probe to monitor the voltage at the side of the test resistor the end connected to the center pin of the BNC connector The laser cathode is not grounded at the controller board and grounding the BNC connector point will shut off current to the laser With a proper laser scan waveform there will be a ramp signal on both sides of the test 10 ohm load resistor connector one higher in amplitude than the other Always confirm that the laser scan waveform is appropriate for the laser be
12. ructions Software to program the on board flash as well as user manuals for both the 1A and 1B modules are available for download from our website at http www portcityinstruments com downloads Download the following files from the website link above e The flash programming software PCI_FPGA_Install zip e 1A User Manual PCI_FPGA_1A_UserGuide_RevB PDF e 1B User Manual PCI_FPGA_1B_UserGuide_RevB PDF 2 1 1 Installing the software Install the flash programming software following the instructions in the 1A manual or the Quick Start Guide included in the original shipment Unzip the flash programming files into any folder on your hard drive and double click the PCI FPGA_setup exe file to complete the installation Skip any messages about certificates and the the control program will appear in the Windows START menu with the filename PCI_FPGA 1 Controller This can be copied to the desktop for easier access by right clicking on the filename under the START menu and selecting Send To gt Desktop Create Icon The 1A manual contains details of the controller board inside the 1B module and how to configure the board for a specific combination of laser and detector 2 1 2 Onboard flash parameters The onboard flash stores parameters that control the laser scan current e scan waveform definition e 1f modulation amplitude e length of a laser off pulse at the start of the laser scan It also stores the 2f demodulator setting
13. s e Phase e Gain e Offset e Internal filter bandwidth PCI FPGA 1B 2 Port City Instruments LLC By default the flash is configured with typical settings for a DFB laser and moderate signal amplitudes Be sure to configure the flash properly for your specific laser before continuing and follow the procedures described in the 1A board manual to ensure that the jumpers are set correctly and all parameters are safe for your laser in particular the laser current scan as applying currents that are too high can permanently damage or destroy a laser t Double Check Parameters Are Safe for Your Laser Lasers can be permanently damaged or destroyed by applying currents that are too high Triple check the parameters for you laser current scan The default board settings are found in the PCI FPGA 1A User Guide in Section 4 Hardware Description Port City Instruments LLC 3 PCI FPGA 1B 3 Connector Descriptions 3 1 Power rear panel Observe the polarity as indicated on the panel label as reversing the connections can permanently damage the controller board inside or to a connected laser For optimum results always power the module with a clean and stable 5 0V power source as the integrity of the output signals can be impacted if a noisy or unstable supply is used Apply 5 0 VDC 0 1V 0 2V power to the screw terminal connector on the rear of the module Current draw is approximately 150 mA without a laser connection
14. s The output voltage is generally ratiometric to the supply voltage so the 1B module provides the stable 5 00V reference needed for these types of pressure sensors Connections are as shown in the upper diagram Connect the pressure sensor s power input lead to the 5 0V pin and the return to the GND pin The raw output voltage from the pressure sensor should be connected to the IN terminal and the OUT terminal is this same signal after passing through an internal buffer circuit with a nominal gain of 1 You can either use the pressure sensor output directly in your application or use the buffered output on the OUT terminal which provides some additional filtering of the signal Pressure Sensor I O GND QUT IN 39 The 1B module can also be ordered for use with common 0 100 mV output unamplified pressure sensors eg the Honeywell line of 19 mm sensors These sensors have a large common mode voltage that is managed internally by the 1B module Connections are as shown in the lower diagram The 1B module provides a 10V bias signal to power the pressure sensor which is the BIAS terminal Power ground is provided on the GND terminal The raw 0 100 mV output of the pressure sensor is input to the 1B module via the OUT and OUT terminals The amplified output of the pressure sensor 0 3 5V typically is provided on the two LOFF pins see section 3 9 which are then not available for the LOFF input function Th
15. tor and InGaAs InAs use of a shield if using a shielded cable indicates the detector cathode the detector anode and s is the shield connection A shunt should be placed on the two leftmost pins of the Bias block for InAs HgCdTe detectors OV bias and on the rightmost two pins for InGaAs detectors 2 5V reverse bias Port City Instruments LLC 5 PCI FPGA 1B The Bias and JMP connectors are for shunts shorting plugs and should be configured as in the following table NOTE A shunt must be installed on one of the two Bias positions InGaAs Detector InAs and HgCdTe Detectors Bias shunt on 2 5V side Bias shunt on OV side JMP2 open no shunt JMP2 shunt installed shorted InGaAs detectors are operated with 2 5V reverse bias while InAs and HgCdTe detectors are operated with zero reverse bias For InGaAs detectors JMP2 should be open no shunt installed For InAs and HgCdTe detectors JMP2 should be shorted shunt installed Refer to the 1A manual for additional details on the detector input connections An access hole is provided on the front panel for the preamp gain adjustment Adjust this for an on scale signal for the DC spectrum output once the laser has been aligned to the detector The 2f gain is set in software see 1A manual for details 3 6 Laser Drive front panel A BNC connector center pin laser anode outer contact laser cathode is provided for the laser drive signa
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