TECHNICAL SPECIFICATIONS
400 Series
. . . Email us at info@mech-tronics.com
Model 400 / 401 Preamplifier
| MODEL 400 PREAMPLIFIER |  |
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| MODEL 401 PREAMPLIFIER | ||
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GENERAL DESCRIPTION
The Model 400 Preamplifier is a General Purpose instrument intended for use in a wide variety of nuclear measurement systems. It essentially consists of a two transistor bootstrapped charge integrator circuit and a H.V. decoupling network.
The Model 401 Preamplifier features a low-noise FET transistor input circuit and is intended for Proportional Counter, X-Ray Scintillation and Semi-conductor detector applications.
Both preamplifiers are inverting, highly linear and have fast rise time characteristics. Their preamp decay time constant is 50 microseconds, matching the pole-zero cancelled first differentiator in Mech-Tronics' main amplifiers, and derive their operating power from the main amplifier through the single BNC cable interconnection which also transfers the signal.
SPECIFICATIONS
| INPUT | |
| Polarity: | Either positive or negative accepted. |
| Impedance: | Effectively zero ohms. |
| OUTPUT | |
| Polarity: | Inversion of the input. |
| Impedance: | 50 ohms. |
| PERFORMANCE | |
| Conversion Gain: | Model 400: 30
millivolts/picocoulomb. Model 401: 100 millivolts/picocoulomb |
| Noise: | Model 400: 16 x 10-16
coulomb rms., with 50 pf. input capacitance and main amplifier 1st clip and integrate time
constants of 1.5 microseconds. Model 401: 2 x 10-16 coulomb rms., with 10 pf. shunt capacitance and main amplifier 1st clip and integrate time constants of 1.5 microseconds. |
| Saturation Level: | +8 volts; -2.5 volts. Open circuit measurement. |
| Rise Time: | 40 Nanoseconds. |
| Integral Linearity: | Within 0.1% to +4 volts or -1 volt. |
| High Voltage: | 2800 volts d.c. maximum for detector. |
| High Voltage Filter: | Model 400: 100K, 0.005µf. Model 401: 1M, 0.005µf. |
| Blocking Capacitor: | 0.005µf. |
| Test Input: | Accepts output from pulse generator through a 4.7 pf. NPO capacitor (2.2 pf. NPO for Model 401). |
| CONNECTORS | |
| High Voltage Input: | Accepts high voltage to be furnished to PM tube. Gremar No. 7096. (BNC connector available upon request.) |
| Output: | Connects output pulses to main amplifier, and accepts preamplifier operating voltage from amplifier, BNC type UG1094A/U. |
| Test Input: | Pulse generator input connector. BNC type UG1094A/U. |
| Cable Supplied: | 72 inch Signal Cable (BNC to BNC) Part No. 186300-72. |
| Ordering Information: | Ordering Stock No. | ||
| 000400-00 | Model 400 Preamp | ||
| 900400-01 | Model 400 Preamp with BNC input. | ||
| 000401-00 | Model 401 Preamp | ||
| 900401-01 | Model 401 Preamp with BNC input. | ||
| (All Shipping Weights 5.0 lb.) |
LINKS . . .
| Mech-Tronics | Nuclear Division | |
| 1635 N. 25th Avenue | (708) 344-0202 | |
| Melrose Park, IL 60160 | ||
| (708) 344-9823 Fax (708) 344-0067 |
Email us at info@mech-tronics.com
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