Performance Tests (MSO/DPO5000 Series)
Compare the tes
t result to the limits. If the result is between the limits,
continue with the procedure to test the channel at the +4 V threshold value.
13. Begin the +4 V t
hreshold test as follows:
a. Push the front-panel D15-D0 button.
b. Set the D0 Threshold value to 4.00 V (+4.0 V/div).
14. Set the DC voltage source (Vs) to +4.4 V. Wait 3 seconds. Check the logic
levelofthechannelD0signaldisplay.
If it is a static logic low, change the DC voltage source Vs to +4.5 V.
15. Decrement Vs by -10 mV. Wait 3 seconds and check the logic level of the
channel D0 signal display. If it is a static logic low, record the Vs value as
V
s+
in the 4 V row of the test record.
If the signal level is a logic high or is alternating between high and low, repeat
this step (decrement Vs by 10 mV, wait 3 seconds, and check for a static logic
low) until a value for V
s+
is found.
16. Push the front-panel Trigger Menu button.
17. Click the lower Slope button to change the slope to Rising.
18. Set the DC voltage source (Vs) to +3.6 V. Wait 3 seconds. Check the logic
levelofthechannelD0signaldisplay.
If the signal level is a static logic high, change the DC voltage source Vs to
+3.5 V.
19. Increment Vs by +10 mV. Wait 3 seconds and check the logic level of the
channel D0 signal display. If it is a static logic high, record the V s value in the
4 V row of the test record.
If the signal level is a logic low or is alternating between high and low, repeat
this step (increment Vs by 10 mV, wait 3 seconds, and check for a static logic
high) until a value for V
s-
is found.
20. Find the average using this formula: V
sAvg
=(V
s-
+V
s+
)/2. Record the average
as the test result in the test record.
Compare the test result to the limits. If the result is between the limits, the
channel passes the test.
4–46 MSO70000/C, DSA70000B/C, DPO7000B/C, DPO7000, MSO5000, DPO5000 Series
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