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printed at  25.07.2008
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Tail Pulse Generator BNC Model BH-1

 

 

FEATURES:

  • Repetition rate 10 Hz - 1 MHz
  • Delay adjustable from -50 ns to 10 ms
  • Rise Time 20 ns - 50 µs
  • Fall Time 50 ns - 1 ms
  • Double Pulse Capability
  • Integral linearity of amplitude +/- 0.1%
  • Output amplitude: to 9.99 Volt from 50 ohms
  • Amplitude jitter: less than 0.002% rms
DESCRIPTION
The Model BH-1 is a precision pulse generator which simulates the broad range of tail pulses encountered in the nuclear field. Several Model BH-1's may be synchronized together to provide test pulses of various shapes and amplitudes to check out a system. Typical applications of the Model BH-1 include: determining the proper timing of linear gates and coincidence units, linearity measurements of amplifiers, threshold setting of discriminators and single channel analyzers, and measuring resolution of low noise preamplifiers.
Of particular interest to those that wish to check pulse pair resolution and recovery time tests is that the BH-1 can operate in a double-pulse mode, with a pair of pulses having a separation varied by the delay controls.
Via an External Reference connector a dc or time-varying signal may be connected to the pulse forming circuit. When the highly linear ramp from Berkeley Nucleonics Model LG-1 is connected, the output is a sliding pulse train (linearly increasing and decreasing amplitude pulses) to 11.7 volts amplitude. The differential linearity of the sliding pulses will be better than 0.25% above 100 mV. The sliding pulse train is one of the most convenient and accurate ways of testing the differential linearity of a pulse height analyzer.

 

SPECIFICATIONS 

INPUTS and OUTPUTS
External Trigger:
Requires 1 volt, positive pulse.

External Reference Input:
+/- 15 volts max.

Output Amplitude:
0.0 V to 9.99 volts maximum. Adjustable by ten-turn potentiometer.
Output Polarity:
Positive or negative.

Trigger Out:
Positive 3 volt pulse, 10 ns rise time, 0.2 us width, 50 ohms output impedance.

GENERAL
Amplitude Characteristics:
Temperature Coefficient of Output: less than 0.03%/oC.
Duty Factor Effect: Amplitude shift less than 0.1% below 30% duty factor. Duty factor in percent for tail pulses is defined as: (8 decay time constants / pulse spacing) x 100.
Integral Linearity of Output:

Jitter of Frequency and Delay:
Less than 0.1%.

Power Requirements:
+24V at 50 mA, -24V at 50 mA, +12V at 175mA, -12V at 80 mA.
+/-0.1%.

CONTROLS
Single cycle:
One pulse occurs each time the push button is pressed.

Attenuator:
x1 and x100 provides up to 1000:1.

Rise Time (10-90%):
20 ns to 50 us (in 11 steps), exponential shape and independent of decay time.

Decay Time Constant (100-37%):
5 ns to 1000 us (in 11 steps), exponential shape and independent of rise time for decay / rise time >10.

Frequency:
A: 10 Hz to 1 MHz, continuously adjustable.
B: External trigger

Delay: -50 ns advance to 10 ms delay (between Trigger Out and leading edge of output pulse).

Single/Double Pulse: This toggle provides for a pulse pair whose separation is varied by the delay controls. Minimum separation is 50 ns.

PHYSICAL
Size:
Double width AEC module 2.7 inches wide x 8,70 inches high. Conforms to TID-20893 (Rev. 2).

Weight:
3.5 lbs. net; 7lbs. shipping.

 

Overview Nuclear Pulse Generators