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
µ
V/
°
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
µ
V referred to the INPUT for gains
≥
100X and 2
µ
s
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
Summary of Contents for 2015A
Page 1: ...Model 2015A Spectroscopy Amplifier Timing SCA User s Manual 9231694B 01 05...
Page 6: ...Notes iv...
Page 12: ...Internal Controls 6 Controls and Connectors Figure 4 Internal Controls...
Page 55: ......
Page 56: ......
