TECHNICAL SPECIFICATIONS
400 Series

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Model 407 / 408 Preamplifier

MODEL 407 / 408 PREAMPLIFIER

  • Separate Energy and Timing Outputs
  • Low Noise
  • ±10 volt Dynamic Range
  • Optimized for Low and High Capacitance Detectors

GENERAL DESCRIPTION

The Models 407 and 408 Preamplifiers are recommended for use with charged particle and heavy ion detectors. The Model 407 has been optimized for noise and rise time with detector capacitance of less than 100 pfd. The Model 400 parameters are optimized for greater than 100 pf detector capacitance.

Both Models include a built in protection network to prevent damage to the input FET's from accidental overvoltage.

 

SPECIFICATIONS

 

INPUTS

Preamp Input: Positive or negative charge accepted from detector. SHV connector, (51494-2 AMP)
HV: Positive or negative charge accepted and applied to detector thru preamp input connector. Maximum ±2000V. SHV connector, (51494-2 AMP)
Test: Accepts voltage input from pulse generator for system test and calibration. BNC connector, (UG1094/U)
Power: Power accepted from main amplifier thru 10 foot cable supplied with preamp, (9-pin "D" male connector)

OUTPUTS

Energy: Tail pulse, polarity inverse of input. 50 ohm impedance.
Time: Differentiated tail pulse derived from energy output. Polarity same as input. 50 ohm impedance. 100 nsec decay time constant.
PERFORMANCE
 

Input (pf)

Capacitance

Noise (1)

Rise Time (2)

Typ.

Max.

Typ.

Max.

407 0

100

1.4

3.3

1.6

3.6

7

14

10

17

408 100

1000

3.6

14.0

4.0

16.0

8

22

10

27

Noise (1) KeV FWHM, Silicon equivalent, measured with 2 usec amplifier shaping time constant.
Rise Time: (2) Given in nsec for 0.5V at timing output (terminated in 50 ohms). Rise Time adjustment optimized for input capacitance. FET protection disabled.
Conversion Gain: (Nominal, SI equiv., E out, open circuit.)
407 - 40mV/MeV
408 - 19mV/MeV
Gain Stability: ±50 ppm/°C
Decay Time Constant: (Nominal, Energy output)
407 - 1.1msec
408 - 2.3 msec
Integral Linearity: (Energy out, open circuit)
within 0.05% to ±10V
Dynamic Input Capacitance: 407 > 50,000pF
408 > 100,000pF
Energy Rate: (10V max out, energy and rate constant)
407 > 1 x 105MeV/sec 1-100MeV
408 > 1 x 105MeV/sec 1-200MeV
Detector Load: 100 Megaohm + 10 Megaohm
Input Protection: Protects against 500V transients at input connector.
Power Requirements: +24V @ 60mA; -24 @ 20mA
+12V @ 10mA; -12V @ 10mA
Cables Supplied: 10 foot long power cable #186329-00

Ordering Information: Ordering Stock No.
000407-00 Preamplifier
900407-01 Preamplifier (with BNC input, 1kV max)
900407-02 Preamplifier (with BNC input, 5kV max)
000408-00 Preamplifier
900408-01 Preamplifier (with BNC input, 1kV max)
(All Shipping Weights 5.0 lb.)

(Size = 1¾ x 3 x 4¼)

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