EG&G ORTEC 414A Instrukcja obsługi i serwisowania - Strona 10

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6. MAINTENANCE

ai. TESTING PERFORMANCE

The following paragraphs are Intended as aids in the

installation and checkout of the 414A. These instructions

present information on front panel controls, waveforms, at

test points, and output connectors. The following, or

equivalent, test equipment is needed:

ORTEC 419 Precision Pulse Generator

Tektronix Model 580 Oscilloscope

100S2 BNC terminators

Vacuum tube voltmeter

ORTEC 410 Linear Amplifier

Two ORTEC 420A Timing Single Channel Analyzers

Schematic and block diagram for 414A

Preliminary procedures consist of the following:

1. Visually check module for possible damage due to

shipment.

2. Connect ac power to ORTEC 401 /402.

3. Plug module into Bin and check for proper mechanical

alignment.

4. Switch on ac power and check the dc Power Supply

voltages at the test points on the 402 control panel.

Testing the

performance of the 414A

involves the

following:

Feed the output of the 420A into coincidence Input

A. Terminate with lOOfi the RG-62/U connecting cable

feeding Input A.

Set the In/Out control toggle switches as follows: A,

In; B, C, and D, Out.

Set the Resolving Time control to 100.

Observe the Fast Coincidence output pulse; it should

be a positive pulse, 6.5 ± 0.6 V and 0.5 ± 0.1 /isec wide.

Loading the 414A Output with 100J2 should reduce the

output to not less than 5 V and the width to not less than

0.5psec.

Putting In/Out switch B or C to the In position should

inhibit the pulse on the 414A Output. Check that both B

and C inhibit. Connect the input into Input 8 and check

that both A and C inhibit. Connect the input into Input C

and check that both A and B inhibit.

Connect the equipment as shown in Fig. 6.1; Keep all

coaxial cables terminated in their characteristic impedance.

Ensure that a positive logic pulse is being received

from the output of each 420A. Set the output delay

control on the Calibrated 420A to 200 and adjust the

Reference 420A output pulse until the leading edges of the

pulses are approximately in coincidence.

414A

FAST COINCIDENCE

RESOLVING TIME

Referenc«

Out out out out

Calibrated

300673

PRECISION PULSE

GENERATOR

419

LINEAR

AMPLIFIER

410

TIMING

SINGLE CHANNEL

ANALYZER

420A

TIMING

SINGLE CHANNEL

ANALYZER

420A

Channel

Exterior

Trigger

OSCILLOSCOPE

Fig. 6.1. 414A Test and Calibrate Circuit.