142A/B/C preamplifier

noise

integral nonlinearity

≤0.03％，0to±7 Vopen circuit or ±3.5 VTermination93Ω。

temperature
instability

142A from0Arrive50℃ <±50 ppm/℃。
142B from0Arrive50℃ <±100 ppm/℃。
142C from0Arrive50℃ <±100 ppm/℃。

open loop gain

142A >40,000。
142B >80,000。
142C >80,000。

charge sensitivity
（Siequivalent)

142A The nominal value is 45 mV/MeV。
142B The nominal value is 20 mV/MeV。
142C The nominal value is 20 mV/MeV。

energy range

142A 0–200 MeV。
142B 0–400 MeV。
142C 0–400 MeV。

E²CRP

Energy squared count rate products:
142A 2 X 10⁷MeV²/s。
142B 5 X 10⁷MeV²/s。
142C 5 X 10⁷MeV²/s。

rise time (93Ω load
Eoutput side
0to0.5 Vpulse)

142A in0pFtime<5ns; in100 pFtime<12 ns。
142B in100pFtime<5ns; in1000 pFtime<25 ns。
142C in400pFtime<11ns; in1000 pFtime<20 ns。

decay time

142A The nominal value is500μs。
142B The nominal value is1000μs。
142C The nominal value is1000μs。

Recommended
Input capacitance
range

142A 0to100 pF。
142B 100to400 pF。
142C 400to2000 pF。

Detector bias voltage

±1000 V。

Input

Accepts positive or negative charge input from any type of detector (usually from a semiconductor detector)
BNCconnector.

bias voltage

Accepts the detector bias voltage from the bias supply and passesINPUTconnector applies it to the detector;±1000 V；SHVconnector orORTEC C-38type.

test

input pulse generator to test and calibrate the system;BNCconnector.

power supply

PassORTECmain amplifier orORTEC 4002Pportable power supply10ft. comes with its own power cord for input power.

E

Positive or negative linear tail pulse for energy measurement.BNCconnector.

T

Used for timed negative or positive linear fast clipping pulses. This output is produced using an inverting transformer that can differentiate the energy output. Its rise time ranges from<5 nsArrive<25 nsNo wait.BNCconnector.

required
power supply

142A +24 V, 20 mA; –24 V, 10 mA; +12 V, 15 mA; –12 V, 15 mA。
142B +24 V, 40 mA; –24 V, 10 mA; +12 V, 15 mA; –12 V, 15 mA。
142C +24 V, 40 mA; –24 V, 10 mA; +12 V, 15 mA; –12 V, 15 mA。

weight

Net weight 0.32Kilogram (0.75ounces).Shipping weight 1.25Kilogram (2.75pounds).

Size

3.81 X 6.10 X 13.3 cm (1.5 X 2.4 X 5.25 inches)。

in142A、142Bor142CChoose from models:

1.Find the depletion depth of the detector. if forORTECdetector, then group2Arrive4digits are expressed in μmdepth in units.

2.Find the depletion depth in the graph above and read the capacitance at the top of the graph (pF/mm²）。

3.Multiply by the area of the detector (unit:mm²). This isORTECmiddle of detector3digits. If the capacitance is less than100 pF, then select142Atype; if the capacitance is greater than100 pFbut less than400 pF, then select142Btype; if the capacitance is greater than400 pF, then select142Ctype. For example: for100μmthe exhaustion depth,ORTEC D-025-200-100The detector will have approximately1 pF/mm². This is useful for200 mm²In terms of area, it is200pF, so it should142Btype preamplifier.

Model

Description

142A

preamp (0to100 pF）

142B

preamp (100to400 pF）

142C

preamp (400to2000 pF）