X-ray System Description
(October 2002)

  • 2.7µs successive approximation ADC (14-bit resolution) - Model 4004X
  • 8.12µs successive approximation ADC (14-bit resolution) - Model 8004X
  • Discriminators (computer-controlled in 0.41% increments):
    • Upper Level 0% to 105% of full scale
    • Lower Level <1% to 105% of full scale
  • Zero adjustment in increments of 0.41% (computer controlled) - Model 4004X
  • Zero adjustment in increments of 0.0005% (computer controlled) - Model 8004X
  • Maximum throughput: 70,000 cps - Model 8004X
  • Maximum throughput: 180,000 cps - Model 4004X

Spectrum memory

  • 250, 1000, 2000, 4000 channels
  • Maximum counts per channel: 231 - 1 (i.e., 2.1E9)

Digital Stabilizer

  • Internal ADC zero and gain stabilization
  • PC-controlled time constants
  • Balanced channel and ROI centroid modes
  • Gain: ±12.5% range - Model 4004X
  • Gain: ±3% range - Model 8004X
  • Zero: ±1.25% range

Amplifier

  • Gaussian or triangular shaping for unipolar pulses
  • Acceptable input: pos./neg. pulses (step or tail) with rise times of 10 ns to 500 ns and decay times from <50 µs to infinity
  • Input (computer selectable): single-ended (BNC) or differential (BNC)
  • Shaping constants (computer selectable):
    • X-ray Systems: 2µs, 12µs or 24µs
  • Pole-zero provided for DCR-type preamplifiers
  • Pole-zero adjustment assistant (eliminates need for oscilloscope)
  • Gain (computer controlled): from 4× to 1300×
  • Coarse gain: 4×, 8×, 32×, 64×, 128×, 256×, 512×
  • Fine gain: 1 to 2.55× in increments of 0.0007×
  • Common mode rejection ratio: 500 (typically 1000)
  • Temperature instability:
    • Gain: guaranteed <±50 ppm/°C, typical <25 ppm/°C, 0 to 50°C
    • Offset: guaranteed ±10 mV/°C
  • Noise: ±0.05%, typical ±0.025%
  • Baseline restorer:
    • Slow channel: rate adaptive with automatic threshold
    • Fast channel with automatic threshold
  • Live-time correction modes: simple busy, Lowes, Gedcke-Hale, external

Non-linearity

  • Differential non-linearity: <±1% over top 99% of range
  • Integral non-linearity: <±0.05% over top 99% of range

Counting presets

  • Real time
  • Live time
  • Integral of all ROIs
  • Integral of selected ROIs
  • Gross ROI statistics
  • Net ROI statistics
  • Total system counts
  • Total SCA counts
  • External events - Model 8004X only

Battery backup for

  • Spectrum
  • Setup parameters
  • Clock memory

Computer control

  • RS-232 baud rates:
    • 2400, 9600, 19200, 38400, 57600, 115200
  • Ethernet 10/100 T-base Model 8004 only
  • Maximum number of units connected to PC: 8

Bias supply

  • 0 to ±1.2 kV 
  • External shutdown capability (positive-true or negative-true polarity)
  • Ripple: 20 mV peak-to-peak
  • Temperature instability: ±0.01%/°C, 0 to 50°C
  • Bias polarity: internally jumper selected

Front panel indicators

  • LEDs for Acquire, Event, Serial Com, AUX I/O in-use, Power, Shaping constant, Bias-on, Polarity, Fault, PUR, Ethernet connection (8004X), 100 Mbps, collision
  • Dead-time meter: 3-color LED array

Rear panel controls and connectors

  • Power switch
  • SHV female connector for detector bias
  • 2.5 mm power jack
  • Fuse housing
  • 9-pin D female preamplifier power connector
  • 9-pin D male RS-232 connector
  • 15-pin D female pulse reset preamplifier interface 
  • 25-pin D female connector for ROI output - Model 8004X
  • 15-pin D auxiliary I/O connector - Model 8004X
  • 44-pin D female pulse reset preamplifier interface connector for multiple ROI output & aux. I/O - Model 4004X
  • Ethernet interface connector (RJ-45) - Model 8004X
  • Ethernet 10/100 T-base - Model 8004X
  • Pole-zero adjustment on/off
  • Pole-zero oscilloscope monitor switch
  • One potentiometer for PZ adjustment of each shaping time (3 total)
  • Input from detector preamplifier (BNC)
  • Differential input from detector preamplifier (BNC)
  • Amplifier output (BNC)
  • ADC input (BNC) 0-10V unipolar or bipolar pulse
  • ADC gate input (BNC) (coin. / anti-coin. / off) CMOS/TTL
  • Pile-up reject input (BNC) CMOS/TTL
  • Amp busy input for ext. amp. live-time corr. (BNC) CMOS/TTL
  • SCA output CMOS/TTL
  • Peak detect output (BNC) CMOS/TTL
  • ADC busy out (BNC) CMOS/TTL

Weight

  • 7.25 lb (3.30 kg)

Dimensions

  • 10.5 in. (26.7 cm) wide
  • 12.5 in. (31.8 cm) deep
  • 4.5 in. (11.5 cm) high

Power requirements

  • 10-18 V DC, 18 watts, external
  • 12 V universal AC supply provided

Software

  • eXcalubur analytical software

Accessories

  • QuantumGold™ software for quantitative analysis
  • High-purity germanium detectors
  • Liquid-nitrogen automatic full system
  • Selection of signal, interface, and detector bias cables

The X-ray systems are covered by a one year return-to-factory limited warranty.