Tektronix P6248, Руководство по обслуживанию

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Performance Verification
8
P6248 1.7 GHz Differential Probe Service Manual
DC Attenuation Accuracy
1.
Connect the probe input to the Y-lead adapter and then to the DC source.
Monitor the source voltage with the DMM.
2. Set the probe to
÷
10 attenuation.
3. Set the input voltage on the DC source to approximately 5 V. Record the
actual voltage as V
in
1.
4. Record the output voltage as V
out
1.
5. Set the input voltage on the DC source to approximately 1 V. Record the
actual voltage as V
in
2.
6. Record the output voltage as V
out
2.
7. Calculate the attenuation as follows: (V
in
1 -- V
in
2)
÷
(V
out
1 -- V
out
2).
8. Verify that the attenuation is in the range of 9.8 to 10.2.
9. Set input voltage on the DC source to approximately 0.5 V. Record the actual
voltage as V
in
1.
10. Change the attenuation to
÷
1.
11. Record the output voltage as V
out
1.
12. Set input voltage on DC source to approximately 0.1 V. Record the actual
voltage as V
in
2.
13. Record the output voltage as V
out
2.
14. Calculate the attenuation as follows: (V
in
1 -- V
in
2)
÷
(V
out
1 -- V
out
2).
15. Verify that the attenuation is in the range of 0.98 to 1.02.
16. Keep the output connections for the next procedure.