XPIN -BT X-ray Detector Operation Manual Detectors

Detectors
®
XPIN -BT X-ray Detector
Operation Manual
XPIN-BT
DET-MAN-MED00014, Rev C, Page 1
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XPIN®-BT X-Ray Detector
Operation Manual
Contents
XPIN-BT X-ray Detector .............................................................................................................................. 3
Initial Inspection ........................................................................................................................................... 3
Accessories ................................................................................................................................................... 4
Detector Handling and Operating Precautions.............................................................................................. 4
Detector Setup............................................................................................................................................... 5
Mechanical ................................................................................................................................................ 5
Cable Connections of XPIN-BT Detector................................................................................................. 6
Electrical ................................................................................................................................................... 6
Detector Temperature Control Operation ................................................................................................. 7
Operating the XPIN-BT Detector ................................................................................................................. 8
Technical Support ....................................................................................................................................... 10
Warranty ..................................................................................................................................................... 10
Appendix ..................................................................................................................................................... 11
Preamp Connector Pin-outs .................................................................................................................... 11
Thermistor Temperature Sensor.............................................................................................................. 12
Table 1 Temperature vs. Thermistor Voltage (Pin 1) ............................................................................ 13
Mechanical Drawing of XPIN-BT Detector ........................................................................................... 14
Mechanical Drawing of Adapter Plate .................................................................................................... 15
Mechanical Drawing of XPIN-BT and Adapter Plate ............................................................................ 16
Internal Temperature Controller Block Diagram .................................................................................... 17
External Temperature Controller Block Diagram ................................................................................... 18
DET-MAN-MED00014, Rev C Page 2
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XPIN®-BT X-Ray Detector
Operation Manual
XPIN-BT X-ray Detector
The XPIN-BT detector is a compact, low-cost Energy Dispersive X-Ray Florescence
(EDXRF) detector. The XPIN-BT combines a silicon PIN diode, a Moxtek ultra-low-noise JFET,
and a high performance two-stage thermoelectric cooler (TEC) achieving great resolution and x-ray
sensitivity. The XPIN preamp provides a low-noise signal output to an analog or digital pulse
shaping amplifier. This detector does not require any external cooling. The XPIN-BT package is ideal
for benchtop and portable applications requiring simple mounting, automatic temperature control,
and metal preamp shielding
Initial Inspection
When the XPIN-BT detector is received, it should be unpacked and inspected as soon as possible.
Inspect the detector and DuraBeryllium® window for any damage that may have resulted during shipping.
If the detector has been damaged, please contact Moxtek immediately (see Figure 1). A serial number for
identifying each detector is located on the preamp detector case.
Detector Signal
Connector (BNC)
Detector Power
Connector
Snout
Mounting Hole
(x4)
Beryllium
Window
Case
Figure 1 XPIN-BT X-Ray Detector
DET-MAN-MED00014, Rev C Page 3
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XPIN®-BT X-Ray Detector
Operation Manual
Accessories
(Ordered separately)
• Mechanical Adapter Plate (see Figure 2)
• Signal BNC Cable (see Figure 3)
• Power Lemo Cable (see Figure 4)
Figure 2 Adapter Plate
Figure 3 Signal BNC Cable
Figure 4 Power Lemo Cable
Detector Handling and Operating Precautions
Care must be taken not to damage the beryllium window. Excessive shock can damage both the
detector and the thermoelectric cooler. Do not drop or allow the detector to strike any surface.
CAUTION: Moxtek detectors contain beryllium. Inhaling beryllium dust causes lung disease. Refer to
the Beryllium Material Safety Data Sheet (MSDS).
CAUTION: The beryllium window can be easily damaged by improper treatment. Do NOT touch the
beryllium window surface with anything, including a cotton swab or soft brush. Sudden impacts can
damage the window.
CAUTION: Do not remove the lid from the case. If problems occur, contact Moxtek. The warranty will
be voided if the lid is removed.
CAUTION: When supplying the detector with high voltage (HV), take precautions to avoid electric
shock.
CAUTION: Check local, state, and/or federal regulations before disposing of the detector.
DET-MAN-MED00014, Rev C Page 4
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XPIN®-BT X-Ray Detector
Operation Manual
Detector Setup
Mechanical
The XPIN-BT detector is equipped with mounting holes so it can be mounted to a fixture.
Mounting the detector to a metal fixture will help keep the detector cool in ambient temperatures
greater than 40°C. It may be necessary to use a fan to cool the detector if the heat sinking is not
adequate. Mechanical drawings for mounting are included in the Appendix.
An optional adapter plate is available for detector use in a customer’s existing mounting
block. To attach the adapter to the detector, slide the adapter under the connectors in the back of the
detector, align the adapter’s two mounting screw holes with those on the detector and then secure the
adapter with the two mounting screws (see Figure 5).
Figure 5 Adapter Plate Attached to Detector
DET-MAN-MED00014, Rev C Page 5
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XPIN®-BT X-Ray Detector
Operation Manual
Cable Connections of XPIN-BT Detector
Refer to Figure 6
•
•
•
Connect one end of the power cable to the power connector of the detector, and the other end
to the detector power supply.
Connect one end of the BNC cable to the signal connector of the detector, and the other end
to digital pulse processor or an analog pulse shaping amplifier.
Ensure there are no ground loops between the detector, x-ray source, power supply, or other
supporting electronics which could result in unwanted noise in the system.
Figure 6 Power and Signal Cable Attached
Electrical
Four voltages are required to operate the XPIN detector:
(See Appendix, Preamp Connector Pinouts)
•
•
•
•
-9V (± 5%) @35mA for preamplifier power (Pin 3)
+9V (± 5%) @ 55mA for preamplifier power (Pin 4)
+170VDC for PIN Diode bias (Pin 2)
TE Cooler voltage (Pin 6,5) (See Appendix, Temperature Control Operation)
DET-MAN-MED00014, Rev C Page 6
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XPIN®-BT X-Ray Detector
Operation Manual
Detector Temperature Control Operation
There are two methods of operation for controlling the detectors internal temperature. The first
method is using the internal temperature controller built into the preamplifier. This internal temperature
controller is the standard configuration. To operate the internal temperature controller 5V @ 1A is
applied to the TE cooler power pin 6. Pin 5 is the return ground. When the preamplifier is configured
with internal temperature controller, Pin 1 is an open collector output that can be used to determine if the
detector is at temperature. When the detector is at temperature, Pin 1 is shorted to ground. When the
detector is not at temperature this Pin 1 is floating.
If operating the detector with an external temperature controller, the preamplifier needs to be reconfigured. This method of temperature control is not standard. The voltage on Pin 1 becomes
proportional to the temperature of the detector (see the Appendix for the Voltage to Temperature Chart).
Pin 6 is the control voltage which ranges from 0 to 3.5V at 0.56A max. Pin 5 remains the return ground
for the TE cooler. Increasing the voltage on Pin 6 will cool the detector and decreasing the voltage will
allow the detector to warm up.
DET-MAN-MED00014, Rev C Page 7
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XPIN®-BT X-Ray Detector
Operation Manual
Operating the XPIN-BT Detector
When operating the XPIN-BT X-ray Detector, adhere to the maximum input specifications listed
in the product datasheet. This document can be downloaded at our company website: www.moxtek.com.
Attach the detector to a power supply using the power cable and attach the BNC signal cable to a
digital pulse processor or to an analog pulse shaping amplifier. Turn on the power to the preamplifier and
then wait until the temperature controller has stabilized to the operating temperature before collecting
spectrum. The resolution of the detector is not stable until the temperature is at the operating temperature.
The standard internal temperature controller is setup to operate the detector at -35°C. When operating the
detector manually you can operate the detector at any desired temperature, however it is recommended
that the detector be operated colder than -25°C. Operating the detector at temperatures warmer than
-25°C will significantly reduce the resolution of the detector.
When the detector is operating, the signal out will look like a saw tooth ramp (shown in
Figure 7.) The x-ray events are contained on the slope of the ramp. The detector will rail if a reset
pulse is not set to bring the ramp back to the top. This is called a Reset Event. During the Reset
Event there is no signal.
Figure 7 Ramp Signal
DET-MAN-MED00014, Rev C Page 8
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XPIN®-BT X-Ray Detector
Operation Manual
Figure 8 shows a typical reset. The Reset Event is typically less then 20µS and goes from
-2V to +2V.
Figure 8 Reset Event
When the detector senses an x-ray, a step is created during the live signal area of the ramp. The
height of the step corresponds to the energy of the x-ray, with larger steps meaning higher energy (see
Figure 9).
Figure 9 X-Ray Events
The Detector Ramp signal is typically connected to a pulse shaping amplifier (PSA) or digital
pulse processor (DPP) which converts the steps into pulses. The output of the PSA or DPP is connected
to a Multi-Channel Analyzer (MCA) where the data is stored and downloaded to a computer for analysis.
DET-MAN-MED00014, Rev C Page 9
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XPIN®-BT X-Ray Detector
Operation Manual
Technical Support
For product technical support, please contact Moxtek at 801-225-0930 or at www.moxtek.com.
Warranty
Please contact Moxtek for product warranty information (801) 225-0930. Failure to adhere to the
specifications listed in the product datasheet and this operation manual may damage the detector and void
the detector warranty.
DET-MAN-MED00014, Rev C Page 10
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XPIN®-BT X-Ray Detector
Operation Manual
Appendix
Preamp Connector Pin-outs
Figure 10 Preamp Connector Pin-outs
Power Connector Standard
Internal Temperature Control
Pin
Description
Set
1
Ready Signal
Open Collector
2
High Voltage
+170 VDC
3
Detector Power
- 9 VDC
4
Detector Power
+9 VDC
5
Temperature GND
GND
6
Temp Control Power
+5 VDC
Shield
Detector Ground
GND
Power Connector
External Temperature Control
Pin
Description
Set
1
Temperature Out
(see Appendix)
2
High Voltage
+170 VDC
3
Detector Power
- 9 VDC
4
Detector Power
+9 VDC
5
Temperature GND
GND
6
TEC Control Voltage
0 to 3.5 VDC
Shield
Detector Ground
GND
Signal Connector (BNC)
Contact
Description
Pin
Detector Signal
shield
Signal GND
Preamplifier Power connector part number:
Manufacture: Lemo
Part #: EPL.1S.306.HLN
Mating connector:
Manufacture: Lemo
Part #: FFA.1S.306.CLA57
DET-MAN-MED00014, Rev C Page 11
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XPIN®-BT X-Ray Detector
Operation Manual
Thermistor Temperature Sensor
The thermistor is a temperature sensitive resistor. The output of the thermistor is buffered to
create feedback voltage on Pin 1 of the power connector. Refer to Table 3 and equation below for
thermistor temperature vs. Pin 1 feedback voltage.
Thermistor: Betatherm 0.3K1CG2
Thermistor Equation:
T=
1
− 273.15
A + B * LN ( R) + C * LN ( R) 3
Where:
T = Temperature °C
R = Thermistor Resistance Ω
A = 0.0018590668
B = 0.0002367000
C = 0.0000007811
R is the resistance of the thermistor. The resistance of the thermistor can be calculated from the voltage
on pin 1 using the following equation.
DET-MAN-MED00014, Rev C Page 12
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XPIN®-BT X-Ray Detector
Operation Manual
Table 1 Temperature vs. Thermistor Voltage (Pin 1)
Temp °C
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
Volts
0.184
0.190
0.196
0.203
0.209
0.216
0.223
0.230
0.238
0.246
0.254
0.262
0.271
0.280
0.289
0.298
0.308
0.319
0.329
0.340
0.351
0.363
0.375
0.388
0.401
0.414
0.428
0.443
0.457
0.473
0.489
0.505
0.522
0.540
0.558
0.576
0.596
0.616
0.636
0.657
0.679
0.702
Temp °C
8
7
6
5
4
3
2
1
0
-1
-2
-3
-4
-5
-6
-7
-8
-9
-10
-11
-12
-13
-14
-15
-16
-17
-18
-19
-20
-21
-22
-23
-24
-25
-26
-27
-28
-29
-30
-31
-32
-33
Volts
0.725
0.750
0.774
0.800
0.826
0.854
0.881
0.910
0.940
0.970
1.002
1.034
1.067
1.101
1.136
1.172
1.209
1.246
1.285
1.324
1.365
1.406
1.449
1.492
1.536
1.581
1.627
1.673
1.721
1.769
1.818
1.868
1.919
1.970
2.022
2.075
2.128
2.182
2.237
2.292
2.347
2.402
Temp °C
-34
-35
-36
-37
-38
-39
-40
-41
-42
-43
-44
-45
-46
-47
-48
-49
-50
-51
-52
-53
-54
-55
-56
-57
-58
-59
-60
-61
-62
-63
-64
-65
-66
-67
-68
-69
-70
Volts
2.458
2.515
2.571
2.628
2.684
2.741
2.798
2.854
2.911
2.967
3.023
3.079
3.134
3.189
3.244
3.298
3.351
3.403
3.455
3.507
3.557
3.607
3.656
3.704
3.750
3.797
3.842
3.886
3.929
3.971
4.012
4.051
4.090
4.128
4.165
4.200
4.235
DET-MAN-MED00014, Rev C Page 13
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XPIN®-BT X-Ray Detector
Operation Manual
Mechanical Drawing of XPIN-BT Detector
DET-MAN-MED00014, Rev C Page 14
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XPIN®-BT X-Ray Detector
Operation Manual
Mechanical Drawing of Adapter Plate
DET-MAN-MED00014, Rev C Page 15
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XPIN®-BT X-Ray Detector
Operation Manual
Mechanical Drawing of XPIN-BT and Adapter Plate
DET-MAN-MED00014, Rev C Page 16
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XPIN®-BT X-Ray Detector
Operation Manual
Internal Temperature Controller Block Diagram
DET-MAN-MED00014, Rev C Page 17
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XPIN®-BT X-Ray Detector
Operation Manual
External Temperature Controller Block Diagram
DET-MAN-MED00014, Rev C Page 18
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