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Input AC power to the PX2CR is provided through a standard IEC 320 plug (110/250 VAC, 50-60 Hz). See Figure 1.
The four (4) DC Voltages needed to operate the XR100CR are supplied through a female 9-Pin D-Connector on the PX2CR. The Pin list to this connector is given below. The multiconductor cable which connects the PX2CR to the XR-100CR is provided with the system.
| Size | 6 x 6 x 3.5 in (15.3 x 15.3 x 8.9 cm) |
| Weight | 2.5 lbs (1.15 kg) |
| Pin 1 | +9 V Preamp power |
| Pin 2 | -9 V Preamp Power |
| Pin 3 | 1-Stage Cooler Power 0 to +2 V @ 700 mA maximum 2-Stage Cooler Power 0 to +3 V @ 350 mA maximum |
| Pin 4 | +9 V Temperature Monitor Power |
| Pin 5 | +H.V. Detector Bias, +100 - 130 V maximum |
| Pin 6 | Ground and case |
| Pin 7 | Cooler power return |
| Pin 8 | Ground and case |
| Pin 9 | Ground and case |
| Polarity | Positive unipolar |
| Shaping Time | Fixed 6 µs, 12 µs, or 20 µs |
| Pulse Width | See Figure 2. |
| Shaping Type | 7 pole "Triangular" with base line restoration, rise time discrimination (RTD), and pileup rejection. |
| Sensitivity | 0 to 1 V/keV (10 turn pot) |
| Gain | 0 to X1000 |
| Gain Shift | See figure 4 |
| Output Impedance | < 1 ohm |
The output pulse produced by the PX2CR Shaping Amplifier is optimum for most applications using the Si-PIN photodiode detectors, and can be connected directly to the input of a Multichannel Analyzer (MCA). For optimum portability and versatility, use the Amptek MCA8000A "Pocket MCA" with 16k data channels.
| Input from XR100CR | Front Panel BNC |
| Output to MCA | Front Panel BNC |
| Pileup Rejection (PU) | Rear Panel BNC, Positive TTL For the duration of this output gate, any detected pulse must be rejected by the MCA |
| Input Count Rate (ICR) | Rear Panel BNC, Positive TTL <2 µs When connected to a counter the ICR countrate corresponds to the total number of X-Ray events that strike the detector. |
This diagram shows the internal connections between the AXRCR hybrid sensor and the electronics within the case, as well as the external connections to the PX2CR.
Figure 1. XR-100CR Connection Diagram
 Figure 2. PX2CR Amplifier Output (12µs shaping time) |
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 Figure 3. Output vs. Input Rate for different Shaping Time Constants |
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 Figure 4. Resolution and Peak Shift vs. Count Rate | |||||||||
Revised January 20, 2005