MODEL 500 R C AMPLIFIER
* Pole Zero Cancelled
* Crossover Walk +/-2ns 100mv-10v.
* Variable Pulse Shaping
* Double Integration/Differentiation

GENERAL DESCRIPTION

Low-cost - high performance amplifier employing pole-zero
cancelled RC shaping and intended for use with scintillation,
proportional and solid state detectors.

A complete line of matching preamplifiers and probe assemblies
provide "Maximized Value" experimentally tailored systems.

Pulse shaping is accomplished by passive RC networks employing
plug-in components to facilitate altering, shaping time constants
to suit experimental requirements. These shaping networks are:
1. Pole zero cancelled 1st differentiator.
2. Double Integrator with front panel In-Out Selection
and gain normalization.
3. 2nd Differentiator with front panel In-Out Selection.

Maximum Amplifier Gain is 512 with Coarse Gain control in
binary steps from 16 to 512. Fine Gain control provides a
gain control range from 0.4 to 1.



SPECIFICATIONS

Inputs

AC Coupled:

BNC Inputs duplicated front & rear.
  • Impedance:

500 ohm
  • Max. D.C. Voltage Applied:

+/- 25 volts

D.C. Coupled:

BNC inputs duplicated front & rear.
  • Impedance:

1 K ohm to -24 volts supplies power for MTN preamplifiers and probes.
  • Pre-Amp Power:

7 pin hex connector (female) rear panel only provides +/- 24 volt, +/- 12 volt and signal input interconnection for those MTN pre-amps (and others) requiring one or more of these standard voltages.

Outputs:

BNC connectors duplicated front & rear provide dual 93 ohms +/- 1% outputs, D.C. coupled with less than 0.3 ohms common source impedance.

Controls

Coarse Gain:

Front panel rotary switch provides gain factors of 16 thru 512 in 6 steps.

Fine Gain:

Front panel single turn control provides 0.4 to 1.0 continuous control.

Nor-Inv:

Front panel toggle switch provides output polarity selection.

Integ:

Front panel toggle switch provides Gaussian (In) or fast rise (Out).

Clip 2:

Front panel toggle switch provides unipolar or bipolar shaping.

Performance

Gain:

512

Gain Stability:

.01% 1degC

Integ. Lin:

Less than o.1%

Diff. Lin:

Less than 0.2%

Noise Referred Input:

1 5 uv rms at all gain settings from 32 to 51 2;

Overload Recovery
(with 50 usec. +/-5% input TC)
Integration In; 2nd Clip Out; Integration In;

For 500 times overload recovers to within 3% of baseline in 2.5 non-overloaded pulse widths.
For 500 times overload recovers to within 1%of baseline in 1.7 non-overloaded pulse widths.

Rise Time (at all gain settings; Integration Out)

170 nanoseconds

Pulse Shaping:

Plug-in components (4 SM capacitors 1 MF resistor) determine shaping time constants. 1.5 usec. standard.

Crossover Walk: Integration In; 2nd Clip In; (at all gain settings)

2 nano seconds over a 100 mv -10 volts dynamic range.

Cable Supplied:

1-18" Signal Cable (BNC to BNC) Part No. 186300-18.

Power Requirements:

+24 volts @ 50 ma; -24 volts@ 50 ma; +12 volts @ 10 ma and -12 volt @ 10 ma.

Size:

Single width NIM module per TID 20893 (Rev.)

Weight:

5 lbs.

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