460 Delay Line Amplifier

Specifications

PERFORMANCE

Gain Range  7-position Coarse Gain selection from 10 through 1000 and single-turn Fine Gain control from 0.3 through 1; total gain is the product of Coarse and Fine Gain settings.

Shaping Filter  Front-panel switch permits selection of integration time constant with t = 0.04, 0.1, or 0.25 ms (40, 100, or 250 ns).

Integral Nonlinearity  £±0.05%.

Noise  £20 mV rms referred to input using 0.25 ms Integrate and maximum Gain of 1000; £25 mV for Gain = 50; £60 mV for Gain = 10.

Crossover Walk  For constant gain, walk <±1 ns for 20:1 dynamic range; <±2 ns for 50:1; <±2.5 ns for 100:1. Crossover shifts <±4 ns for any adjacent Coarse Gain switch settings.

Count Rate Stability   A pulser peak at 85% of analyzer range shifts <0.2% in the presence of 0 to 10⁵ random counts/s from a ¹³⁷Cs source with its peak stored at 75% of the analyzer range.

Temperature Instability
Gain  £±0.01%/°C, 0 to 50°C.
DC Level  £±0.1 mV/°C, 0 to 50°C.

Overload Recovery  Bipolar recovers to within 2% of rated maximum output in <5 nonoverloaded pulse widths from X500 overload; unipolar recovers in same time from X100 overload.

Delay Line Shaping  1-ms. Both delay lines have the same value.

ELECTRICAL AND MECHANICAL

Power Required  +24 V, 90 mA; -24 V, 90 mA; +12 V, 75 mA; -12 V, 60 mA.

Dimensions  Standard single-width NIM module 3.43 x 22.13 cm (1.35 x 8.714 in.) per DOE/ER-0457T.

CONTROLS

FINE GAIN  Front-panel single-turn potentiometer for continuously variable gain factor of X0.3  to X1.

COARSE GAIN  Front-panel seven-position switch selects gain factors of X10, 20, 50, 100, 200, 500, and 1000.

INTEG  Front-panel slide switch selects an integration time constant of 0.04, 0.1, or 0.25 ms. For 0.04-ms setting amplifier rise time is <75 ns.

PZ ADJ  Front-panel potentiometer adjusts pole-zero cancellation for decay times from 25 ms to infinity.

POS/NEG  Front-panel slide switch sets input circuit for either input polarity.

DC ADJ  Front-panel potentiometer adjusts the dc-level for single-delay-line shaped unipolar output pulses.

DELAY IN/OUT  Rear-panel slide switch selects either delayed (In) or prompt (Out) timing for unipolar output pulses. Delay is equal to the width of the unipolar output pulse.

INPUTS

BNC  Connector on front panel accepts either positive or negative inputs with rise time of 10 to 1000 ns and decay time of 25 to 2000 µs; Z_in @ 1000 W, dc-coupled; linear maximum 3.3 V; absolute maximum 20 V.

OUTPUTS

UNIPOLAR  Prompt or delayed with full-scale linear range from 0 to +10 V; single-delay-line shaped; baseline restored level adjustable to ±1 V; Z_o <1 W, dc-coupled through front-panel BNC connector; Z_o = 93 W, dc-coupled through rear-panel BNC connector. Short-circuit protected.

BIPOLAR  Prompt output with positive lobe leading, double-delay-line shaped with full-scale linear range of 0 to 10 V; Z_o <1 W, dc-coupled through front-panel BNC connector; Z_o = 93 W, dc-coupled through rear-panel BNC connector. Short-circuit protected.

Preamp  Standard ORTEC power connector for mating preamplifier; rear-panel Amphenol 17-10090 connector.

ORDERING INFORMATION