419 Precision Pulse Generator

Specifications

PERFORMANCE

PULSE AMPLITUDE Output peak adjustable from 0 to ±1 V. This converts to 0–2 pC, using the charge terminator supplied, and is equivalent to 0–44 MeV referred to a silicon semiconductor detector. Rise time is selected by front-panel switch; fall time is an exponential decay time constant of 200 µs (terminated) or 400 µs (unterminated).

TEMPERATURE INSTABILITY <±0.005%/°C from 0 to 50°C.

LINE VOLTAGE INSTABILITY <±0.001% per 10% change in power line voltage.

RIPPLE AND NOISE £0.003% of pulse amplitude.

PULSE REPETITION RATE Either the ac power line frequency, or 70 ±10 Hz using the internal oscillator.

INTERNAL OSCILLATOR
Temperature Instability <±0.05%/°C, 0 to 50°C.
Time Instability <±1%/day.

INPUT

EXT REF Rear-panel BNC connector accepts an external reference voltage to control the full-scale Pulse Height control range and polarity when the front-panel Ref Voltage switch is set at Ext; maximum, ±20 V; output full-scale range, 50% of reference level with output terminated in 100 W.

OUTPUT

DIRECT Front-panel BNC connector with an adjacent test point furnishes the adjusted and normalized full amplitude output pulses through an output impedance of 100 W.

ATTENUATED Front-panel BNC connector with an adjacent test point furnishes the same output pulses as above, with amplitudes attenuated by the factor selected with the 5 toggle switches.

PULSE HEIGHT VOLTAGE Two test points on the rear panel permit a dc voltmeter or oscilloscope to monitor the voltage level that is applied to the pulse-forming relay.

CONTROLS

PULSE HEIGHT 10-turn potentiometer with a duo-dial adjusts the output pulse amplitude within a total range; the range is a combined function of the reference and the setting of the Normalize control. Linearity ±0.1% of full scale.

NORMALIZE 10-turn potentiometer adjusts the total range for the Pulse Height control when using Ref Voltage Int switch; full-scale range from ±0.5 V to ±1 V; linearity, ±0.1% of full scale.

RELAY 3-position slide switch selects the ac power line frequency or the internal 70-Hz oscillator for the output repetition rate, and includes an Off position to set the pulser at standby.

REF VOLTAGE 2-position slide switch selects either the internal reference voltage for a 100% normalized full-scale range of 0 to ±1 V or the external reference voltage for an output full-scale range and polarity that are determined by the level furnished through the rear-panel BNC connector.

POLARITY 2-position slide switch selects either polarity for the output pulses when using the internal reference.

RISE TIME (nsec) 5-position rotary switch selects the rise-time shaping for the output pulses to simulate various types of detectors; selections are MIN (~5 ns), 20, 50, 100, and 250 ns.

ATTENUATION FACTOR 5 toggle switches select a step attenuation for output pulses furnished through the Attenuated Output connector; the factors are 2, 2, 5, 10, and 10. They may be used in any combination to cover a 2000:1 dynamic range using 0.1% tolerance resistors.

ELECTRICAL AND MECHANICAL

POWER REQUIRED +24 V, 45 mA; –24 V, 25 mA; +12 V, 0 mA; –12 V, 5 mA; 117 V ac, 10 mA.

WEIGHT
Net 2.0 kg (4.5 lb).
Shipping 2.9 kg (6.5 lb).

DIMENSIONS Standard double-width NIM module 6.90 X 22.13 cm (2.70 X 8.714 in.) per DOE/ER-0457T.

INCLUDED ACCESSORIES

VOLTAGE TERMINATOR A standard 100-W resistive terminator is attached to the Direct Output connector on the front panel to terminate the output correctly when only the Attenuated Output is being used.

CHARGE TERMINATOR A specially constructed terminator is mounted in a rear-panel clip and should be used to properly terminate the pulser output and feed a charge signal into the signal input of a charge-sensitive preamplifier when the output pulses are being furnished for this type of test.

ORDERING INFORMATION