312 Plugin Units

3-13. INSTALLATION. Insert vertical amplifier (or other unit desired to produce vertical deflection) into the lower compartment, and lock in place. Insert a time base plug-in (or amplifier) into upper compartment, and lock in place. For double-sized plug-ins, remove the dividing shield, insert plug-in, and lock.

NOTE

For proper operation, make sure that the shield is in place when using standard size plug-ins.

3-14. GAIN. Because of differences in cathode-ray tube sensitivities, it will usually be necessary to readjust plug-in gain when units are interchanged or moved from one Model 140A to another.

1. Applies AC line power to the instrument.

2. Indicates that the instrument is on.

3. Returns beam to CRT screen.

4. Aligns trace with graticule.

5. 10-volt peak-to-peak calibrating signal (line frequency square wave).

6. 1-volt peak-to-peak calibrating signal (line frequency square wave).

7. Controls intensity of CRT display.

8. Controls roundness of spot.

9. Adjusts focus of trace.

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