Rms Voltage - Tektronix 7D12 Operator's Instruction Manual

13. Set the M3 VERTICAL DISPLAY ATTEN to lX.
14. The vertical sensitivity should read 1 V.
15. Set the RANG E switch to 200 V.
16. The readout should read within the limitsof 00.0 V
to 00.1 V, and the vertical sensitivity should read 10 V.
17. Set the M3 VERTICAL DISPLAY ATTEN to lOX.
18. The vertical sensitivity should read 100 V.
19. Set the RANGE switch to 0.5 kV.
20. The readout should read within the limits of
.000 kV to .001 kV, and the vertical sensitivity should read
1000 V.
21. SettheM3VERTICAL DISPLAY ATTEN to lX.
22. The vertical sensitivity should read 100 V.
23. Set the 7D12 VERTICAL DISPLAY ATTEN to 2X.
24. The vertical sensitivity should read 200 V.
25. Set the 7D12 VERTICAL DISPLAY ATTEN to 5X.
26. The vertical sensitivity should read 500 V.
27. Rotate the 7D12 VERTICAL DISPLAY POSITION
control full clockwise and full counterclockwise. Check
that the horizontal trace can be positioned off the graticule
area in both directions. Position the trace to the center
horizontal graticule line.
28. Remove the banana-plug jumper connecting the
I NPUT connectors together.
This concludes the operational check procedure.
RMS Voltage
29. Connect the supplied test lead set to the INPUT
connectors.
®
30. Set the controls as follows:
VERTICAL DISPLAY
ATTEN
7012
lX
M3 Operating Instructions-7012 Operators
RANGE
VERTICAL DISPLAY
ATTEN
Coupling
M3
20V
OUT1X
OUT AC+DC
31. Connect a 4 volt calibrator signal from the
oscilloscope to the INPUT connectors.
32. Set the time-base controls to obtain a triggered
calibrator waveform display.
33. Check the amplitude of the calibrator waveform
display for approximately four divisions. (Note that the
calibrator waveform baseline is referenced to zero volts.)
See Fig. 4-2A.
34. Check that the readout display is the RMS value of
the input signal. (0.707 X Epk
=
RMS).
35. Set the M3 Coupling switch to AC.
36. The display should center itself on the CRT, and the
loss of the DC factor should change the RMS readout
display. (1/2 Epk to Epk
=
RMS) See Fig. 4-2B.
RMS
I~~.l\'-
READOUT
.
-
I
.....................................
."
...
I
SENSITIVITY
~ V
(VO L TS/DIVISION -
1,-- --+-_.L....--'-_-'----'-_.l..-~_.l...___'___l
(AI AC + DC COUPLING
I
•.....
-
-
.,
...
I
v
(BI AC COUPLING
Fig. 4-2. Analog Waveform and Digital Displays.
4-3