RADFETR Users Manual V1.0
Contents
1. cycle Figure 4 2 ma SAO 5 Attributes of RadFETR When the RadFETR samples a channel a 160 uA current source is applied This effect at this current source on a set of load test resistors can be seen in Figure 5 1 On each channel there is one 2 2 uF capacitor that holds the voltage Figure 5 1 Graph of the Load versus Voltage with Load Test Resistor Voltage Resistances Actual values with additional external loads Expected line for 160 pA The leakage surrent of this RadFETR storage capacitor is calculated to be about 700pA in each channel Figure 5 2 is the drop of voltage for an 8 volts sample Figure 5 3 is the same for a 4 volts sample Figure 5 4 is the same for a zero volts sample Figure 5 5 is the same for a negative 4 volts sample Figures 5 2 5 5 shows the drop in voltage over a time period of 30 seconds On average the change 15 between 9 to 10 mV Figure 5 2 Figure 5 3 Voltage Drop of a 8V Sample Voltage Drop of a 4V Sample gt TAR Seeds c AZI Awr jE 10 Figure 5 2 Figure 5 3 Voltage Drop of a Zero Volt Sample Voltage Drop of a 4V Sample rupem m ATCLY kon 5 References Instrument Development Laboratory RADPBEF Techincal Information edes pes cte dim teste ice lonizine Radiation Sensor eesseccecuecse eate eee ande S www mdl sandia g2. INSTRUMENT DEVELOPMENT LABORATORY UNIVERSITY OF HAWAIT MANOA RadFETR USERS MANUAL Version 1 0 August 5 200 By Larry Ruckman and Gary Varner INSTRUMENT DEVELOPMENT LABORATORY RadFETR Users Manual 08 05 2004 Manoa Hawaii www phys hawaii edu idlab Technical questions idlab phys hawaii edu TABLE of CONTENTS IINTRODUCTION oe oe CT er cr err rere 2 Front Panel Inputs Outputs and Displays MI 3 Powering 4 Types of Readout AABANG BANI NANANA LT 4 2 Logger Output A3 Serial Read ra aa press 5 Attributes of Rad FET R 0200000xxx00000000000000000000000000000aa oo 0 0 6 References 1 Introduction This user manual is intended to provide general guidelines for the use of the RadFETR reader RadFETR is an acronym for Radiation Field Effect Transistor Readout See the website http nmrc ie projects radfets tech html for more back information about RadFET RadFETR 15 for measuring radiation damage as observed by the device The RadFETR is able to self trigger or can be externally triggered The RadFETR is powered by either an external 12 volt DC power supply or a standard NIM bin power connection If further technical information is required or a copy of the Schematics 15 needed please contact IDLAB t
3. echnical support at idlab 2 phys hawaii edu 2 Front Panel Inputs Outputs and Displays Figure 2 1 The Front Panel A B C D F G H 1 J RadFET Display displays the voltage of the front panel s selected channel Front Panel Selected Chan displays the channel that is selected in the front panel The coding of the channel displaying are shown in Table 2 1 Trig Sel This toggle switch allows the user to switch between internal and external triggering mode Trigger Source This LED shows whether the RadFETR 15 in external or in internal triggering mode When the LED is green the RadFETR is in internal triggering mode When the LED 1s red the RadFETR 15 in external triggering mode RadFET Readout Chan Sel The RadFET Readout Channel Select shows which channel the RadFETR is sampling on The channels displaying are shown in Table 2 1 FAO This is a LEMO connector that allows Table 2 1 LED Number Coding Actual Channel LED Channel Display o chamei2 1 i chamel3 2 channe 3 i channe 4 channel6 5 channel 6 channel9 8 channel 10 8 i channel B channe D the user to probe the channel that is selected on the front panel selected channel The FAO can be connected to a voltmeter or even an oscilloscope This is a great way to measure the voltage without the RadFET Di
4. hannel The FAO can be connected to a voltmeter or even an oscilloscope This is a great way to measure the voltage without the RadFET Display Remember that when taking readouts with the FAO that you are only measuring one single channel that has been selected 4 2 Logger Output Readout The Logger Output is a 34 pin connector that sends a signal of the voltage of the channel that is being sampled The numbering of this connector is shown on Figure 2 2 A description of the pins is shown in Table 2 4 There is a convenient ground pin next to each signal pin This type of read out only sends a signal of the channel that being triggered 4 3 Serial Readout Figure 4 1 SAO Readout The Serial Readout is a great way of measure all 16 channels quickly and CH 1 CH2 CH3 and so on compactly In Figure 2 2 the pin numbering for this connector is shown The serial pin description 1s ie seen in Table 2 3 SAO pin 1 1s readout of pin An example of this signal is provided in Figure 4 1 The amplitude of the signal 1s the voltage of channel The signal goes in numerical order from channel through channel 16 As seen in Figure 4 2 SAO is the signal of all 16 channels Timing references are provided to aid in using an external ADL SATSI 15 Ground the enable signal which indicates that the serial output is active SATS2 is a sample stroke signal which may be used to initiate an ADL conversion
5. nel Channel 1 Channel 1 Channel 1 Channel 1 Channel 1 ko lt 2g Wl Rel ala UI RadFET Input Logger Output Co Channel 1 Channel 1 No Connect Frt Pan Chan Sel The Front Panel Channel Select allows the user to change the selected front panel channel by the twist of the knob The knob can be twisted to change from one channel to another channel with a small flat head screwdriver pP _ NO NO NWO N lt lt s LB Ext Trigger This LEMO connector allows the user to send an external trigger into the RadFETR TTL level signal between 2 and 3 3 volts 15 required to externally trigger the RadFETR Ext Power This is the external power connector which allows the user to power the RadFETR from the front panel The required DC voltage for the external power is 12 volts Table 2 4 Description of Serial I O Pins is is the serial E Serial I O This is the serial input output Connection to connector In Figure 2 2 the pin numbering for SAO this connector is shown The serial analog SATS1 input out connector allows the user to do two SATS2 things One 15 to program CPLD that is in 75 Vols the board without having to open the casing The program serial pins are pins 5 through 10 The second thing is a quick readout of all 16 ie 7 channels with a signal from SAO pin 1 The 9 Kh read
6. out pins are pins 1 through 4 The serial pin description is seen in Table 2 3 Table 2 4 Description of Logger Output Pins Logger Output The Logger Output is a 34 pin connector that provides readout of all 16 channels The numbing of this connector is shown on Figure 2 2 A description of the pins is provided in Table 24 3 Powering Up The RadFETR is power up by either the DC power connection which is found on the Front panel or by the use of standard NIM bin connection There are only two pins being used to provide corresponding power of 12 volts This is shown in Figure 3 1 Figure 3 1 Description of Nim Bin Pins tii Vals When using the front panel DC to power the RadFETR 12 volts DC 1s required The amount of current to run RadFETR is about 650mA Make sure that the Power Status LED is Green before use of the RadFETR before using either type of power The DC connector is shown in Figure 3 2 The outer shell of the connector is the ground connection The inner shell of the connector is the 12 volts connection Figure 3 2 Description of DC Power Connector Shells The Inner Shell is 12 Volts 4 Types of Readout There are three ways to get readout from the RadFETR One way is done with the FAO Another is using the 34 pin Logger Output The last way is with the Serial I O 4 1 FAO Readout The FAO is a LEMO connector that allows the user to probe the channel that 15 selected on the front panel selected c
7. ov mstc technologies microsensors radiationsensor html NOTE Make sure that you check the IDLAB website for the latest version of the schematics and firmware www phys hawaii edu idlab 11
8. splay Power Status This LED lets the user know if there is a major power problem When the LED is green this means that the power 15 ok When the LED ss red this means that there 15 a power failure Serial Analog Chan Sel The Serial Analog Channel Select shows channel that the Serial I O is outputting When the Serial I O triggers in the current firmware it goes through all 16 channel in a fraction of a sec This means that you will not be able to see which channel the Serial I O is triggering on with the naked eye Read Strobe This LED goes on when internal or external triggering 15 active When the LED is green this means that RadFETR samping 1s active The LED turns off from green after about a second from the trigger of the system If the external trigger is faster than about 1 Hz this LED will look like it is always on RadF et Input This 34 pin connector allows the users to put an external resistance load on any of the 16 channels of the RadFETR To put a load on a channel a resistance must be connected between a channel and 12 volts The pin numbering 15 in Figure 2 2 and the description of each pin is in Table 2 2 Figure 2 2 Table 2 2 Connector Pin Numbering Description of RadFET Input Pins RadFET Connected to Serial 1 0 Channel 1 annel o N O J App CA wl A FZ mg ON pa ala 1 sis MIN Channel Channel Chan
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