EG&G ORTEC 474 Руководство по эксплуатации и обслуживанию - Страница 7

Просмотреть онлайн или скачать pdf Руководство по эксплуатации и обслуживанию для Усилитель EG&G ORTEC 474. EG&G ORTEC 474 13 страниц. Tinning filter amplifier

Печатать страницу

INVERT/NONINVERT Front panel toggle switch selects

inversion or noninversipn of the input signal polarity for

the polarity of the output signal.

2.3.

INPUT

INPUT Front panel BNC connector accepts input pulses

of either polarity; amplitude 0 to ±1 V, protected to ±6 V dc

and to ±100 V at 10% duty cycle integrated over 1 second;

impedance 10011 dc coupled. Accepts a ±5 V dc offset;

maximum input (signal plus offset) limited to ±5 V.

2.4.

OUTPUTS

OUTPUT

Front panel BNC connector furnishes the

shaped and amplified signal through Z.,u. <in, dc cou

pled. Amplitude 0 to ±5 V; risetime and decay time con

trolled by Integrate and Differentiate filter settings.

PREAMP POWER

Rear panel standard ORTEG power

connector, Amphenol type 17-10090.

2.5.

ELECTRICAL AND MECHANICAL

POWER REQUIRED

+24 V, 56 mA; -24 V, 37 mA; +12 V,

102 mA; -12 V, 121 mA.

DIMENSIONS

NIM-standard single-width module (1.35

by 8.714 in.) per TID-28093 (Rev).

INSTALLATION

3.1.

GENERAL

The 474 operates on power that must be furnished from

a nuclear-standard bin and power supply such as the

ORTEG 401/402 Series. The bin and power supply is de

signed for relay rack mounting. If the equipment is to be

rack mounted, be sure that there is adequate ventilation

to prevent any localized heating of the components that

are used in the 474. The temperature of the equipment

mounted in racks can easily exceed the maximum limit of

50° G (323 K) unless precautions are taken.

3.2.

CONNECTION TO POWER

The 474 contains no internal power supply and must

obtain the necessary dc operating power from the bin and

power supply in which it is installed for operation. Always

turn off power for the power supply before inserting or

removing any modules. ORTEG modules are designed

so that a full complement of modules installed in the bin

will not overload the NIM-standard power supply. Since,

however, this may not be true when the bin contains mod

ules other than those of ORTEG design, the dc power

levels should be checked after all of the modules have

been installed. The ORTEG 401/402 Series Bins and

Power Supplies have convenient test points on the power

supply control panel to permit monitoring these dc levels.

3.3.

INPUT/OUTPUT CONNECTIONS

The input impedance of the 474 is about 10011 and pro

vides a suitable termination for cable with a characteristic

impedance of 9311. If the cable that is used for the input

signals has a characteristic impedance of 50fl, use a BNG

Tee at the 474 Input to accommodate the cable and a 10011

terminator; the terminator and the input impedance,

which are in parallel, will then match the 5011 cable im

pedance.

The low output impedance of the 474 requires that the

output cable be terminated by the characteristic imped

ance of the cable at its remote end. This can be accom

plished at the input of a high-input impedance instrument

or by using an instrument with an input impedance equal

to the impedance of the cable. Both driving end and re

ceiving end coaxial line termination is recommended for

long cables, although this reduces the driving amplitude

by 50%.

OPERATING INSTRUCTIONS

Either of two functions, or both, may be furnished by the

ORTEG 474 Timing Filter Amplifier, depending on the

details of the circuit in which it is installed. It may be used

to linearly amplify a small amplitude range into one that is

better suited to the requirements of a subsequent instru

ment in the system; the gain can be set at any level from

X2 through X250 for this purpose. The shaping time con

stants that select integration and differentiation circuits

in the 474 can be set to normalize a pulse rise and decay

time to optimize timing measurements. In addition to

these basic functions, the 474 can also be used to invert

the pulse polarity if desired and to correct for the pole-

zero effect that is prov'ded from the preamplifier in the

system.