IEC 61151 1st Edition, August 1992
NUCLEAR INSTRUMENTATION - AMPLIFIERS AND PREAMPLIFIERS USED WITH DETECTORS OF IONIZING RADIATION - TEST PROCEDURES
Additional Comments: BILINGUAL * W/D NO S/S
Published By:International Electrotechnical Commission (IEC)
Scope and object
The test procedures of this International Standard cover amplifier and preamplifier systems with linear pulse shaping networks for use with semiconductor, scintillation and proportional detectors in the spectrometry of ionizing radiation. The object is to provide a common language and methodology for users and manufacturers of pulse-amplifier systems.
Test procedures for associated detectors are described in IEC 333 and IEC 973.
Not all of the tests described in this standard are mandatory, but those that are performed to determine preamplifier and amplifier specifications shall conform to this standard.
The emphasis on the methods of measurement is to enhance sensitivity and improve accuracy by working around the limitations of the test instruments, particularly oscilloscopes which have only a visual display for read-out. A null technique is used where possible, thereby reducing basic errors to the inaccuracy of a pair of precision resistors. When use of a bridge is inappropriate, such as in measurements of pulse height with an oscilloscope, the pulse is made to occupy a fixed amplitude and vertical position on the face of the cathode ray tube. Some measurements require test instruments or fixtures not commercially available at this writing; circuit diagrams for their construction are given in the annexes. The use of a standard nuclear instrument module to test the performance of an amplifier is not acceptable unless the errors introduced by that module can be corrected for or shown to be less than the error caused by the amplifier. Examples are the use of a crossover pickoff module to measure crossover walk in a bipolar amplifier and an MCA to measure nonlinearity and noise.