Canberra 2015A - Amplifier Performance

DISC A – Jumper plug sets the rear panel DISC BNC connector to OUTPUT the
Lower Level (E) Discriminator or the Upper Level (E + ∆E) discriminator when DISC
B is in the OUT position; factory set to ULD.
LLD – Jumper plug sets the LOWER LEVEL discriminator threshold for INternal or
EXTernal; if EXTernal with DISC B set to IN, the rear panel DISC BNC connector
can be used as the LLD SWEEP input; factory set to IN.
SCA MODE – Jumper plug which allows the SCA to operate in the TSCA or SCA
mode; factory set to TSCA.
Performance
AMPLIFIER
GAIN – Continuously variable from X12 to X1280; product of COARSE and FINE
GAIN controls.
GAIN DRIFT – <±0.0075%/°C.
DC LEVEL DRIFT – <±50 µV/°C.
INTEGRAL NONLINEARITY – ≤±0.05% of full scale.
OVERLOAD RECOVERY – Recovers to ±2% of full scale OUTPUT in two pulse
widths for a X1000 overload with pole/zero cancellation properly set.
NOISE CONTRIBUTION – <7 µV referred to the INPUT for gains ≥100X and 2 µs
SHAPING.
PULSE SHAPING – Near-Gaussian shape; one differentiator, two active integrators
and only one secondary time constant; time to peak ≈ 1.75 X shaping time constant.
RESTORER – Active, gated.
SPECTRUM BROADENING – FWHM of a
60
Co 1.33 MeV gamma peak for an in
-
coming count rate of 2 kcps to 50 kcps and a 9 V pulse height will change less than
16%. These results may not be reproducible if associated detector exhibits an inordi
-
nate amount of long rise time signals.
PEAK STABILITY – The peak position of a
60
Co 1.33 MeV gamma peak for an in
-
coming count rate of 2 kcps to 50 kcps and a 9 V pulse height will shift less than
0.025%.
41
Performance