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BNC Model BH-1 Tail Pulse Generator
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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 - 1000 /°s
- Integral linearity of amplitude ±0.1%
- Output amplitude: to 9.99 volts from 50 ohms
- Amplitude jitter: less than 0.002% rms
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. Thisfeature
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 andaccurate ways of testing
the differential linearity of a pulse height analyzer.
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. |
