Detector
Optimum Shaping (
µ
sec)
Scintillation Pholomultiplier
0.5
Gas Proportional Counters
0.5 through 2
Silicon Surface-Barrier
0.5 through 2
Lithium Dialed Germanium [Ge(Li)]
2 through 4
Cooled Silicon
8 through 12
The Model 2015A is factory set for 0.5 or 2
µ
s shaping time constants. However, the
shaping time constants can be changed to 8 and 12
µ
s to be compatible with cooled
Silicon detectors. Change the components as follows:
1.
Change C1 from 560 pF to 9100 pF
2.
Change C2 from 1600 pF to 560 pF
3.
Change R1 from 19.1 k ohms to 226 k ohms
4.
Change R2 from 52.3 k ohms to 11 k ohms
5.
Change C3 from 130 pF to 2000 pF
6.
Change C4 from 360 pF to 1300 pF
7.
Change C5 from 200 pF to 2400 pF
8.
Change C6 from 510 pF to 1600 pF
9.
Change C25 from 47 pF to 1000 pF
10.
Change C26 from 200 pF to 510 pF
11.
Change C76 from 390 pF to 1800 pF
12.
Change R143 from 604 k to 499 k ohms
13.
Change RV12 from 20 k to 50 k ohms
All resistors are RN60Cs and capacitors are 1% silver mica or 1% ceramic NPO. (See
Figure 13)
13
Spectroscopy System Operation
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: ......
