919E EtherNIM Multichannel Buffer

Specifications

 PERFORMANCE

ADC  Successive-approximation type with sliding-scale linearization.

Max Resolution  16,384 channels, software selectable as 16,384, 8192, 4096, 2048, and 1024.

Conversion Time Per Event  <7 µs fixed.

Integral Nonlinearity  ≤±0.025% over top 99% of full scale.

Differential Nonlinearity  ≤±1%.

Gain Instability  ≤±50 ppm/°C.

Dead Time Correction  Extended Live Time correction according to Gedcke-Hale method.

Throughput  Average maximum rate 60,000 counts/sec stored in memory.

Data Memory  64k channels of NON-volatile memory; 2³¹–1 counts per channel (2 billion); may be partitioned as up to four segments of equal or unequal size in the range of 1k to 16k channels each.

Presets

Real Time/Live Time  Multiples of 20 ms.

Region of Interest  Peak count/integral count.

Data Overflow  Terminates acquisition when any channel exceeds 2 billion.

MULTIPLEXER/ROUTER

Inputs  One to four; software selectable.

Signal Isolation  Typically >90 db rejection of unselected input.

Input Threshold  Automatically adjusted above noise level for each input to the multiplexer/router.

Gain  Nominally One; segments 2, 3, and 4 are fixed. Segment 1 controlled by internal Digital Gain Stabilizer, ±1%.

DC Level Instability  ≤20 µV/°C.

Integral Linearity  0.05%.

Gain Instability  50 ppm/°C.

DIGITAL SPECTRUM STABILIZER 

Peak centroid stabilization for input 1; either zero, gain, or both. Window width, for both and gain: ±1 to ±256 channels.

Correction Resolution  At 16k ADC resolution: 0.04 channels (for gain); <0.08 channels (for zero).

ADC Word Size  14 bits (16k channels) maximum.

Setup/Enable/Disable  From computer.

FRONT-PANEL INDICATORS

ADC BUSY  Red, busy-rate LED flashes once for each pulse digitized by ADC.

CPU BUSY  Red, busy-rate LED; intensity indicates the relative activity of the microprocessor.

ACTIVE INPUT  Each active segment indicated by green LED.

STAB BUSY  LED indicates when stabilizer is active.

CONTROLS

ADC ZERO  Screwdriver potentiometer adjusts the ADC zero offset ±250 mV.

ADC LLD  Screwdriver potentiometer adjusts the ADC lower level discriminator from 0 to 50% of full scale.

INPUTS

INPUT 1–4  Accepts positive unipolar, positive gated integrator, or positive leading bipolar analog pulses in the dynamic range of 0 to +10 V; +12 V maximum; semi-Gaussian-shaped or gated-integrator-shaped time constants of 0.25 to 30.0 µs, or delay-line-shaped with width ≥0.25 µs. Z_in ~1000 Ω, dc-coupled. No internal delay. INPUT 1: BNC connectors on front and rear panels. INPUT 2, INPUT 3, and INPUT 4: BNC connectors on rear panel only.

ADC GATE  Optional, slow-positive NIM input. Computer-selectable Coincidence or Anticoincidence. Signal must occur prior to and extend 0.5 µs beyond peak detect; front-panel BNC connector. GATE control for all active segments.

PUR 1–4  Pile-up rejection input; accepts slow-positive NIM signal; signal must occur prior to peak detect. Z_in ≥1 kΩ. PUR 1: BNC connector on front panel. PUR 1–4: Rear-panel PUR/ BUSY/IO connector. An optional pigtail cable (919-OPT1) converts rear-panel 15-pin D connector to multiple BNCs.

BUSY 1–4  Busy input used by multiplexer/router and live-time correction circuits. Accepts slow positive NIM signal, Z_in ≥1 kΩ. BUSY 1: BNC connector on front panel. BUSY 1–4: Rear-panel PUR/BUSY/IO connector. An optional pigtail cable (919-OPT1) converts rear-panel 15-pin D connector to multiple BNCs.

SAMPLE READY  TTL input signal, on rear-panel PUR/BUSY/IO connector. An optional pigtail cable (919-OPT1) converts to multiple BNCs.

OUTPUTS

CHANGE SAMPLE  TTL output signal, on rear-panel PUR/BUSY/IO connector, software addressable. An optional pigtail cable (919-OPT1) converts to multiple BNCs.

INTERFACES⁴

Ethernet  Rear-panel BNC connector, accepts IEEE 802.3 10BASE2 (thin-wire coax).

PUR/BUSY/IO  15-pin D male connector. Provides BUSY and PUR inputs for each of four segments. Two sample-changer signals included on this connector are Change Sample output and Sample Ready input.

ELECTRICAL AND MECHANICAL

POWER REQUIREMENTS  +12 V, 370 mA; –12 V, 175 mA; +24 V, 185 mA; –24 V, 150 mA; +6 V, 1.20 A.

DIMENSIONS  NIM-standard two-wide 6.90 X 22.13 cm (2.70 X 8.714 in.) front panel per DOE/ER-0457T.

WEIGHT
Net  2.25 kg (5 lb).
Shipping  3.1 kg (7 lb).

OPTIONS

919-OPT1  Pigtail Cable containing 12 BNC cables to connect up to four amplifiers with pile-up rejector (PUR) and live-time clock to the Model 919E. (ORTEC 671/672 highly recommended.)

⁴The following connectors are also available:
Dual-Port Memory  ORTEC dual-port interface, 37-pin D connector.
RS-232-C  Serial standard RS-232-C 25-pin; male wired as DTE to run at 38.4k baud maximum, with modem control. Software selectable baud rate. (For diagnostics)

ORDERING INFORMATION