142IH Preamplifier

Specifications

PERFORMANCE

NOISE  Increases with increasing input capacitance. Typical slope, 0 to 100 pF = 27 eV/pF; 100 pF to 1000 pF = 34 eV/pF. Typical performance values, based on silicon equivalent of e = 3.6 eV at t = 2 µs, are 1.9 keV at 0 pF; these become 4.6 keV at 100 pF and 35 keV at 1000 pF.

RISE TIME  Based on a +0.5 V signal through either output into a 93-W circuit and measured from 10% to 90% of peak amplitude; <20 ns of 0 pF and <50 ns at 100 pF.

SENSITIVITY  Nominal, measured through either output, 45 mV/MeV Si.

ENERGY RANGE  0 to 100 MeV Si.

E²CRP  Maximum energy-squared count-rate product: 7 x 10⁷ MeV²/s.

DYNAMIC INPUT CAPACITANCE  10,000 pF.

INTEGRAL NONLINEARITY  £±0.05% for 0 to ±7 V open circuit or ±3.5 V terminated in 93 W.

TEMPERATURE INSTABILITY  £±100 ppm/°C, 0 to 50°C.

DETECTOR BIAS ISOLATION  ±3000 V.

OPEN LOOP GAIN ³40,000.

INPUTS

INPUT  Accepts input signal from a detector and extends operating bias to the detector.

BIAS  Accepts the bias voltage for the detector from a bias supply.

TEST  Accepts input voltage pulses from a pulse generator for instrument and system check and calibration; R_in = 93 W.

OUTPUTS

E AND T (for Energy and Timing)  2 connectors furnish identical signals through 2 output paths; either or both of these outputs can be used as required, and they are interchangeable. R_o = 93 W through each connector, and the output polarity is opposite from the inut pulse polarity (output pulse polarity is the same as bias polarity).

CONNECTORS

INPUT AND BIAS  SHV.

TEST, E, AND T  BNC.

POWER CABLE  3-m (10-ft) captive power cable, ORTEC 121-C1; longer lengths available on special order.

ELECTRICAL AND MECHANICAL

POWER REQUIRED  +24 V, 30 mA; -24 V, 10 mA; +12 V, 15 mA; -12 V, 15 mA. Furnished from NIM bin and power supply through any ORTEC main amplifier or from an ORTEC Model 4002P Portable Power Supply; built-in captive cable is compatible with either source.

WEIGHT
Net  0.45 kg (1 lb.)
Shipping  1.3 kg (3 lb.)

DIMENSIONS  3.8 x 6.1 x 13.3 cm (1.5 x 2.4 x 5.25 in.) plus 3-m (10-ft) cable.

ORDERING INFORMATION