ORTEC 420 - Maintenance and Troubleshooting; Performance Testing Procedures

6-1
6. MAINTENANCE INSTRUCTONS
6.1 Testing Performance
6.1.1 Introduction
The following paragraphs are intended as an aid in the installation and
checkout of the Model 420. These instructions present information on front
panel controls, waveforms and test points, and output connectors.
6.1.2 Test Equipment
The following or equivalent test equipment is needed:
(1) ORTEC Model 419 Pulse Generator
(2) Tektronix Model 545 Series Oscilloscope
(3) 100-ohm BNC terminators
(4) ORTEC Model 410 Amplifier
(5) Schematics and Block Diagrams for the Model 420 Timing Single
Channel Analyzer
6.1.3 Preliminary Procedures
(1) Visually check module for possible damage due to shipment.
(2) Connect ac power to Nuclear Standard Bin, e.g., ORTEC Model
401/402.
(3) Plug module into Bin and check for proper mechanical alignment.
(4) Switch on ac power and check the dc power voltages at the test points
on the Model 401 Power Supply control panel.
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6.1.4 Testing the Single Channel Function
(1) Connect the direct output of the pulse generator to the scope trigger.
Connect the attenuated output of the pulse generator to the input of
the Model 410 Amplifier. Place all attenuator switches on the pulse
I generator to the out position except one switch, which should be an
XI0 switch. Set the Model 410 Amplifier DIFFERENTIATION control to
double delay line. Set the INTEGRATION control to the .1 fisec posi-
i tion. Adjust the pulse generator output and/or amplifier gain control
to achieve an amplifier output pulse height of approximately 10 volts.
< ] (2) Connect the amplifier output to the single channel analyzer input. Set
the Model 420 DIFF./INT. switch to the INT. position, and set the
BIPOLAR/UNIPOLAR switch to the BIPOLAR position. Adjust the "AE"
dial to read 500/1000 divisions. There should now be on output from
both fast and slow outputs of the single channel analyzer. Turn the
I "E" dial to read 1000, then adjust the pulse height dial on the pulse