855 dual amplifier

gain range

from5Arrive1250Continuously adjustable.

pulse shape

When the peak time is equal to2.2τ，50% pulse width equals3.3τ，0.1% level when the pulse width is equal to the peak time4.0times, it is semi-Gaussian in all ranges. bipolar crossover = 1.5τ。

integral nonlinearity

for1.5 μsplastic surgery time,<±0.05％。

noise

Use3 μsWhen unipolar shaping is performed, it is referred to the input terminal<5 μV rms;Use1.5 μsDuring plastic surgery,<7μV; Both gains are ≥100。

temperature instability

Gain <±0.0075％/°C，0to50°C. DC level <±30μV/°C，0to
50°C。

bipolar cross swimming

for50:1dynamic range, in0.5 μsDuring plastic surgery<±5 ns, includingORTEC 552single-channel analyzer.

Overload recovery

For unipolar outputs, when using gain, the2.5within a non-overload pulse width fromX300Overload returns to rated output2Within %. For bipolar, fromX500Recovery from overload is the same.

restorer

A gated active baseline restorer with automatic threshold circuitry provides the threshold level as a function of signal noise to the baseline restorer discriminator.

spectrum broadening

for⁶⁰Co 1.33 MeVgamma ray, in1to50,000count/seconds input count rate range, at full scale85Normally at %<10% FWHM. Unipolar output,1.5 μsplastic surgery.

Spectral drift

for⁶⁰Co 1.33-MeVGamma line, at full scale85% (at unipolar output,1.5 μsplastic surgery,1to50,000count/seconds), the peak displacement is usually<0.02％。

Fine-tune gain

Ten-turn precision potentiometer with dial, continuously adjustable direct-reading gain coefficientX2.5toX12.5。

Coarse gain adjustment

The six-position switch selects the gain coefficient as2、4、10、20、40and100feedback resistor.

shaping time

three-position printed circuit board (PWB) jumpers, easily accessible through the side panel, select for the active pulse shaping filter network0.5、1.5or3 μstime constant.

POS/NEG

PWBJumpers optionalPosorNegEnter pulse polarity.

PZ ADJ

Screwdriver adjustable potentiometer for30 μsSet the pole-zero cancellation to ∞ input decay time.

Input

BNCFront and rear panel connectors accept positive or negative pulses with a rise time of10to650 ns, the decay time is30 μsto ∞;Z_in =1000 Ω DC coupling; linear value2 V;value20 V。

UNI

Z_o <1 Ω front panelBNCconnector andZ_o =93 Ω rear panel connector. With short circuit protection function;0to+10 VFull-scale linear range; active filter shaping; DC recovery,
DC level adjustable to ±15 mV。

BI

Z_o <1 Ω front panelBNCconnector andZ_o =93 Ω rear panel connector. With short circuit protection function; mainly positive lobe and0to+10 Vfull-scale linear range; active filter shaping.

Preamp power supply

rear panel standardORTECpower connector (Amphenol 17-10090) with allORTECPairing of onboard and offboard power cords on the preamplifier.

Required power supply

+24 V, 83 mA; –24 V, 70 mA; +12 V, 125 mA; –12 V, 140 mA。

weight

Net weight 1.5Kilogram (3.3pounds).Shipping weight 3.1Kilogram (7.0pounds).

Size

Standard single widthNIMmodule3.43 X 22.13cm (1.35 X 8.714inches), consistent withDOE/ER-0457Trequirements.

Model

Description

855

dual amplifier