Tektronix MSO70000 Series Technical Reference page 259

MSO70000/C, DSA70000B/C, DPO7000B/C, DPO7000, MSO5000, DPO5000 Series
4. Turn on the digital channels and set the thresholds as follows:
a. Push the front-panel D15-D0 button.
b. Select the D7-D0 tab on the left and turn channels D7-D0 On.
c. Select the D15-D8 tab and turn channels D15-D8 On.
d. The instrument will display the 16 digital channels.
e. Click in the Global Threshold box and set the value to 0.00 V.
f. Click Apply.
g. All thresholds are now set for the 0 V threshold check.
5. Set the Horizontal Scale to 5 μs/div.
6. Set the source as follows:
a. Push the front-panel Trigger Menu button.
b. Under Source, click Select.
c. In the Source Selection box, select Ch D0. Click OK.
7. Set the DC voltage source (Vs) to -400 mV. Wait 3 seconds. Check the logic
level of the channel D0 signal display. If it is at a static logic high, change the
DC voltage source Vs to -500 mV.
8. 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 Vs value
as in the 0 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
9. Click the lower Slope button to change the slope to Falling.
10. Set the DC voltage source (Vs) to +400 mV. Wait 3 seconds. Check the logic
level of the channel D0 signal display.
If it is at a static logic low, change the DC voltage source Vs to +500 mV.
11. Reduce 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
0 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
12. Find the average using this formula: V
as the test result in the test record.
Performance Tests (MSO/DPO5000 Series)
is found.
s-
is found.
s+
= (V
sAvg s-
in the
s+
+ V )/2. Record the average
s+
4–45