Tektronix 3B5, Instruction Manual

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Calibration — Type 3B5
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1. Adjust Trigger Level Centering (R15). Page 6-5.
+ and — 20 volt sine-wave signal centered within
the LEVEL control range (EXT-AC).
2. Check Trigger Level Control Range. Page 6-6.
EXT-AC Checked as part of step 1
EXT-DC At least + and — 10
volts
3. Adjust Auto Triggering Centering (R35). Page 6-6.
Stable auto triggering on a 0.5-division display
throughout the rotation of the LEVEL control.
4. Check Low-frequency Triggering Operation. Page 6-7.
Correct triggering with minimum deflection or mini ­
mum input voltage in all positions of the Trigger
Function switch.
5.
Check Trigger Slope Operation and Coupling.
Page
6-7.
Stable triggering on correct slope of the input signal
and indication of correct trigger coupling.
6. Check High-Frequency Triggering Operation. Page
6-8.
Correct triggering at 50 kilohertz and 20 megahertz
with minimum deflection or minimum input voltage in
all positions of the Trigger Function switch.
7. Adjust Basic Timing (R515). Page 6-10.
Correct timing is 1 ms/DIV.
8. Check Variable Control Range. Page 6-11.
At least 2.5:1.
9. Check Sweep Length. Page 6-11.
Normal sweep 10.3 to 11.3 divisions
Magnified sweep 12 to 15 divisions
10. Adjust Delay Start and Stop (R330 and R333).
Page 6-12.
Alignment of DELAY dial indication with correspond­
ing markers in CRT display.
11. Check Delay Dial Incremental Linearity and Accuracy
Page 6-12.
Incremental linearity, within ±0.4%. Accuracy,
within ±0.4% of full scale at 1 ms/DIV (with step 10
correctly adjusted and line voltage held constant);
within ±3% of full scale at all other sweep rates
12. Check Delayed Sweep Magnifier Jitter. Page 6-13.
3 parts or less per 10,000.
13. Adjust One-Second Timing (R395). Page 6-13.
Correct timing at 1 s/DIV.
14. Adjust One-Microsecond Timing (C168). Page 6-13.
Correct timing at 1 μ s/DIV.
15. Adjust 10-Microsecond Timing (C315). Page 6-14.
Correct timing at 10 μ s/DIV.
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16. Adjust 0.1-Microsecond Timing (C502). Page 6-15.
Correct timing at 0.1 μ s/DIV.
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17. Adjust High-Frequency Compensation (C547 and
C551). Page 6-17.
Optimum horizontal amplifier response at 50 ns/DIV
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18. Adjust Registration (R505). Page 6-18.
No display shift at first graticule line when changing
from 0.1 μ s/DIV to 50 ns/DIV.
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19. Adjust 50-Nanosecond and 20-Nanosecond Timing
(R508 and C507). Page 6-19.
Correct timing at 50 ns/DIV and 20 ns/DIV.
22 20. Adjust 10-Nanosecond Timing (C547 and C551).
Page 6-19.
Correct timing at 10 ns/DIV.
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21. Check Normal and
Page 6-20.
1s to 10ns
5 s and 2 s
Magnified Timing Accuracy
Within ±3% with correct
readout-panel indication.
Within ±5% with correct
readout-panel indication.
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22. Check Operating Mode. Page 6-23.
Instrument operates correctly in the mode selected
by the EXT, MAN and SEEK buttons.
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23. Check Seek Mono Pulse Width and Seek Cycling
Time. Page 6-23.
Seek mono pulse width
Seek cyling time
One second to 1.8 sec
onds.
One to two seconds.
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24. Adjust Cycles/Sweep (R650). Page 6-24.
Nominal CYCLES/SWEEP setting.
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25. Check Seek Mode Operation. Page 6-24.
Correct operation with seek command from remote ­
seeking probe, amplifier unit program connector,
front-panel SEEK button and the Type 3B5 PROGRAM
connector. Does not seek when amplifier unit seek
button is pressed.
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26. Check Seek Mode Frequency Response. Page 6-25.
Correct Seek Mode operation from 30 hertz to 20
megahertz.
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27. Check Multitrace Sync Pulse. Page 6-25.
About five-volt pulses to amplifier unit.
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28. Check Delayed Sweep Magnifier Intensifier Levels.
Page 6-25.
Following voltage levels to indicator oscilloscope:
DLY'D SWP MAG
switch OFF
DLY'D SWP MAG
switch at X10
DLY'D SWP MAG
switch at XI 00
About —12 volts
About — 6 volts during
magnified sweep time
About zero volts during
magnified sweep time
6-3