EG&G ORTEC 427 Manuel d'instruction - Page 17

Parcourez en ligne ou téléchargez le pdf Manuel d'instruction pour {nom_de_la_catégorie} EG&G ORTEC 427. EG&G ORTEC 427 20 pages. Delay amplifier

6-2

(3) Connect the bipolar output of the 410 to the INPUT of the 427

through RG-62/U coble and terminate the cable at the input of

the 427 with a 100-ohm terminator. Ensure that all DELAY

switches are in the OUT position.

(4) Vary the amplitude of the 427 OUTPUT by adjusting the 419

Pulser; there should be no distortion of the signal as it is varied

from 0 to 10 volts.

(5) Raise the output amplitude of the 419 until the 427 saturates; the

saturation level should not be less than 1 1 volts.

(6) Adjust the 419 for a 10-volt output signal from the 410 and leave

it at this setting for the remainder of the test.

(7) The output of the 427 should be 10 volts and should come promptly

with respect to the input signal.

(8) Switch each individual delay line into the circuit and ensure that

the 427 output remains at 10 volts and is delayed the appropriate

amount.

(9) Switch al l delay lines into the circuit. The 427 output should be

approximately 11 volts and delayed 4.75 microseconds from the

input signal.

6.2 Changing Amplifier Gain

R22

The gain of the output coble driver loop is given by the ratio of

gain of this loop can be changed as much as 10% by increasing or decreasing the

value of Rll and R12 without any adverse effect. Since these resistors are used to

terminate the delay lines, it is not recommended that their values be changed by more

than 10%.

6.3 Suggestions for Troubleshooting

In situations where the 427 is suspected of malfunction, it is essential to

verify such malfunction in terms of simple pulse generator impulses at the input

and output. In consideration of this, the 427 must be disconnected from its

position in any system, and routine diagnostic analysis be performed with a test

pulse generator and an osci l loscope. It is imperative that testing not be per

formed with a source and detector until the Delay Amplifier performs satisfact

orily with the test pulse generator.

The testing instructions in Section 6. 1 of this manual, and the circuit descriptions

in Section 5 should provide assistance in locating the region of trouble and repairing