ORTEC 473 - Calibration; Equipment Required.Jg; Preliminary Procedure; Leading Edge Discriminator Test

! ! ■ 1
15
7. CALIBRATION
7.1. EQUIPMENT REQUIRED
The following test equipment, or equal, is required to calibrate the 473 circuits:
1. ORTEC 401A/402A Bin and Power Supply
2. Hewlett-Packard 8004A Pulse Generator
3. Tektronix 485 Oscilloscope
4. Tektronix 10X Probe
5. Tektronix 50 Ohm Step Attenuator
6. Tektronix CT-3 Time Pickoff
7. EH 971-5 Risetime Integrator
8. Fluke 8000A Digital Multimeter
9. ORTEC 425 Delay
10. ORTEC 457 Biased Time to Pulse Height Converter
11. ORTEC 448 Research Pulser
12. ORTEC 454 Timing Filter Amplifier
13. ORTEC 276 Photomultiplier Tube Base and Preamplifier
7.2. PRELIMINARY PROCEDURE
Install the 473 in the Bin and Power Supply and turn on the power. Allow the instrument to warm up for at least ten minutes
before Cdlibrating any of its circuits.
7.3. LEADING EDGE DISCRIMINATOR TEST
I. Set up the system as shown in Fig. 7.1.
2 Monitor -st point TP5 at the base of 010 with a dc voltmeter. Adjust R32 as necessary to read -1.23 V at TPS.
3. Turn front panel Disc Level control fully counterclockwise to its minimum reading of 50 dial divisions, for 50 mV.
4. Turn ULLE Adjust, R66, fully clockwise.
5. Monitor IC4(14) with the 10X oscilloscope probe.
6. Adjust R66 counterclockwise until the amplitude at IC4(14) is about 650 mV.
7. Turn HP8004A amplitude switch to 2.5 V.
8. Turn LLLE Adjust, R65, fully clockwise.
9. Monitor IC2(15) with the 10X oscilloscope probe.
10. Adjust R65 counterclockwise carefully until the signal at IC2(15) reaches about 800 mV.
II. Turn HP8004A amplitude switch to 5 V.