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474 timing filter amplifier

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Brief description:Timing with germanium detector Spectral measurements at ultra-high count rates Optional filters for pulse shaping Optimization of signal-to-noise ratio Continuously adjustable gain, X2 to

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Detailed introduction

Timing using a germanium detector
Energy spectrum measurements at ultra-high count rates
Optional filters for pulse shaping
Signal-to-noise ratio optimization
Continuously adjustable gain, X2 to X250
extreme zero cancellation
DC coupled

The ORTEC Model 474 Timing Filter Amplifier is designed to shape pulses and also optimize the signal-to-noise ratio of timing measurements. The Model 474 is particularly suitable for use with ORTEC constant fraction timing discriminators in timing applications with germanium or silicon charged particle detectors. It derives the input signal directly from the preamp output.

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- 474 Brochure
- 474 Brochure (A4)
- 474 Manual
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The Model 474's fast rise time, high output drive, and high gain capabilities make it suitable for other applications such as system timing using low-gain photomultiplier tubes. In addition, pole-zero cancellation circuits, DC coupling, and time-invariant baseline restorers allow for energy spectrum analysis at ultra-high count rates using scintillation detectors and Si charged particle detectors.

Various input pulse shapes can be filtered as needed for signal processing. The Type 474 combines continuously adjustable gain (X2 to X250) with individually selectable integral (τi) and derivative (τd) time constants for proper pulse shaping, making it ideal for time measurements.

Specifications +

Performance

Input amplitude range	0to±1 Vsignal,0to±5 VDC offset; input total ±5 V。
Output amplitude range	The load is50 When Ω,0to±5 V。
noise	For gain, the input-referred rms noise is ≤10 μV, where τ_i= τ_d= 200 nsor ≤50 μV(filterout); useHewlett-Packard 3400ATrue RMS instrument measurement.
rise time	For filtersOut，≤10ns, other options are~2.2 τ_i。
nonlinear	in ±5 VMid-band within the range ≤±0.05％。
temperature instability	The DC level is referred to the output terminal ≤±25 μV/°C。 Gain≤±0.06％/°C。 0to50°CRange specifications.

control

Coarse gain adjustment	front panel6Bit switches are used to selectX1、X2、X4、X6、X10orX20。
Fine-tune gain	Front panel single turn potentiometer fromX2ArriveX12.5Continuous adjustment.
Extreme zero adjustment	Front panel screwdriver adjustment to compensate for preamp decay time constant.
time constant	The two on the front panel6Bit switch: • PointsRCTime constant:Out(equivalent to4 ns）、20、50、100、200and500 ns。 • DifferentialRCTime constant:Out(equivalent to0.2 ms）、20、50、100、200and500 ns。 NOTE: ByOutThe position is differentiated and integrated, and the passband is1 kHzto35 MHz。
NotINV/INV	Selects inverted or non-inverted input signal.

Input

Positive or negative polarity selectable via front panel switch; amplitude0to±1 V; in1 sinternally integrated10% duty cycle, is protected to ±6 V dcand±100 V;Impedance100Ω, DC coupled; front panelBNCconnector. Accept ±5 VDC offset, input (signal plus offset) limited to ±5 V。

Output

Output	front panelBNCconnector. Amplitude0to±5 V;For filterout, rise time ≤10 ns(For other filter selections, this is2.2 τ_i). impedance<1 Ω, DC coupled.
Preamp power supply	rear panel standardORTECpower connector,Amphenol 17-10090。

electrical and mechanical

Required power supply	+24 V, 65 mA; –24 V, 45 mA; +12 V, 160 mA; –12 V, 180 mA。
weight	Net weight 1.0Kilogram (2.4pounds). Shipping weight 2.5Kilogram (5.4pounds).
Size	NIMStandard single width module,3.43 x 22.13cm (1.35 x 8.714inches), consistent withDOE/ER-0457Trequirements.

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Model

Description

474

Timing filter amplifier

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474 timing filter amplifier

474 timing filter amplifier

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