EG&G ORTEC 553 Operating And Service Manual - Page 7

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2. SPECIFICATIONS

2.1.

PERFORMANCE

Dynamic Range 100:1.

Pulse-Pair Resolving Time Output pulse width plus

Delay (as selected by the front panel Delay control), plus

100 ns for negative NIM output or plus 200 ns for positive

NIM output. Minimum resolving time for negative output,

220 ns; for positive output, 800 ns.

Threshold Temperature instability <0.015%/° C of full

scale, 0 to 50°C using a NIM class A power supply

(referenced to -12 V).

Discriminator Noniinearity <±0.25% of full scale (inte

gral) for LL discriminator.

Delay Temperature instability <0.04%/°C of full scale,

0 to 50° C.

Delay Noniinearity <±2%.

Window Width Constancy <0.1% variation of full-scale

window width over the linear 0- to 10-V range.

Minimum input Threshold 50 mV for Lower Level dis

criminator.

Time Shift vs Pulse Height (Walk)

Walk (ns)

Dynamic

Range

10:1

50:1

100:1

System

±1.0

±2.5

±3.0

±2.0

±4.0

±8.0

System A: Using an ORTEC 460 Amplifier, single delay-line mode,

integrate ^0.1 ms with delay line 1 mS-

System B: Using an ORTEC 471 or 472A Amplifier, unipolar output with

0.5 fiS shaping time, input from ORTEC 419 Pulser.

2.2.

CONTROLS

Lower Level

Front panel 10-turn potentiometer adjust

able from 0 to 10 V; when the rear panel LL Ref mode

switch is set on Int, determines the threshold setting for

the Lower Level discriminator. When the LL Ref mode

switch on the rear panel is in the Ext position, this control

is ineffective.

Window or Upper Level

Front panel 1-turn potenti

ometer determines the window width (0 to +1 V) in the

Window mode or the Upper Level (0 to +10 V) threshold

in the Normal mode. This control is disabled in the

Integral mode.

Int/Nor/Win

Front panel 3-position locking toggle

switch selects one of three operating modes.

Integral LL sets a single-discriminator threshold (0

to +10 V) and UL response is ignored for SCA outputs.

Normal UL and LL are independently adjustable lev

els (0 to +10 V); differential mode operation.

Window

LL sets the baseline level (0 to +10 V) and UL

sets the window width (0 to +1 V); differential mode

operation.

Delay

Front panel 1-turn potentiometer for continuous

adjustment of output delay over a 0.1 to 1.1 fis range.

Walk Adjust Front panel screwdriver adjustment for

precise setting of walk compensation.

LL Ref Mode

Rear panel two-position locking toggle

switch selects either the front panel LL potentiometer or

the voltage signal applied to the rear panel LL Ref Ext

connector as the LL discriminator reference threshold.

2.3.

INPUTS

Signal Input Front panel dc-coupled BNC connector

accepts positive unipolar or bipolar signal, 0 to +10 V

linear range, ±12 V maximum; width, ^100 ns; lOOOfl

input impedance.

LL Ref Ext When the rear panel LL Ref mode switch is

on Ext, the rear panel LL Ref Ext BNC connector accepts

the Lower Level biasing (an input of 0 to -10 V on this

connector corresponds to a range of 0 to 10 V for the

Lower Level discriminator setting). Input protected to

±24 V.

2.4.

OUTPUTS

Pos Out Front panel BNC connector provides positive

NIM-standard output, nominally +5 V; <20 ns rise time,

500 ns wide; <10n output impedance. Output occurs at

the mid-point of the linear input trailing edge plus the

output Delay as selected by the front panel control.

Neg Out Front panel BNC connector provides negative

NIM-standard output, nominally -16 mA (800 mV on 50fi

load); width, <20 ns; rise time, <5 ns. Output occurs at

the mid-point of the linear input trailing edge plus the

output Delay as selected by the front panel control.

UL Out Rear panel BNC connector provides NIM-

standard output, nominally +5 V, 500 ns wide; <10n

output impedance. Output occurs as leading edge of

linear input crosses the UL threshold.

2.5.

RELATED EQUIPMENT

The 553 is compatible with all ORTEC amplifiers and

other amplifiers having a 0- to 10-V positive, linear output

range.

2.6.

ELECTRICAL AND MECHANICAL

Power Required

+24 V, 82 mA; +12 V, 160 mA;

-24 V, 50 mA; -12 V, 120 mA.

Dimensions NIM-standard single-width module (1.35

by 8.714 in.) per TID-20893 (Rev).