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Model BH1 Tail Pulse Generator |
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- Repetition rate 10 Hz - 1 MHz
- Delay adjustable from -50 ns to 10 ms
- Rise time 20 ns - 50 µs
- Fall time 50 ns - 1000 /°s
- Integral linearity of amplitude ±0.1%
- Output amplitude: to 9.99 volts from 50 ohms
- Amplitude jitter: less than 0.002% rms
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| The Model BH-l 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-l 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.
Double Pulse Generation
A front panel toggle, SNGL/DBL PULSE, provides for the
generation of two identical pulses whose separation is
varied by the delay controls. This feature is useful in
resolution and recovery time tests.
External Reference
A dc or time-varying signal may be connected to the pulse
forming circuit via an external reference connector. 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. |
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Frequency
10 Hz to 1 MHz, continuously adjustable.
External Trigger
Requires 1 volt, positive pulse.
Single Cycle
One pulse occurs each time the push button is pressed.
Single/Double Pulse
This toggle provides for a pulse pair whose separation is
varied by the delay controls.
Minimum separation is 50 ns.
Rise Time of Output (10-90%)
20 ns to 50 us (in 11 steps), exponential shape and
independent of decay time.
Decay Time Constant of Output(100-37%)
50 ns to 1000 us (in 11 steps), exponential shape and
independent of risetime for decay/rise time >10.
Trigger Out
Positive 3 volt pulse, 10 ns rise time, 0.2 us width, 50
ohms output impedance.
Delay
-50 ns advance to 10 ms delay (between Trigger Out and
leading edge of output pulse).
Output Amplitude
Zero to 9.99 volts maximum. Adjustable by ten-turn
potentiometer.
Attenuator
X10 and X100 providing up to 1000: 1.
Integral Linearity of Output
±0.1%.
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) X100.
Output Polarity
Positive or negative.
Output Impedance
50 ohms.
External Reference Input
±15 volts max.
Jitter of Frequency and Delay
Less than 0.1%.
Temperature Coefficient of Output
Less than 0.03%/°C.
Amplitude Jitter (Resolution)
Less than 0.01% peak, 0.002% rms of pulse amplitude.
Power Required
+24 V at 50 mA, -24 V at 50 mA, +12 V at 175 mA, -12 V at 80
mA.
Mechanical Dimensions
Double-width AEC module, 2.70 inches wide by 8.70 inches
high. Conformsto AEC Report TID-20893 (Rev. 2).
Weight
3.5 lbs. net, shipping 7 Ibs. |
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