Tektronix MSO2000 series Technical Reference

Performance Verification
9. Before you chan
ge the threshold value, push the Fine front-panel button to
turn off the fine adjustment and make adjusting the value quicker. Turn the
Multipurpose b knob and set the value to 0.00 V (0 V/div).
The thresholds are set for the 0 V threshold check. You need to record the test
values in the row for 0 V in the test record for each digital channel.
10. Push the front-panel Trigger Menu button.
11. Push the Source lower-bezel button, and turn Multipurpose a knob to select
the appropriate channel, such as D0.
By default, the Type is set to Edge, Coupling is set to DC, Slope is set to
Rising, Mode is set to Auto, and Level is set to match the threshold of the
channel being tested.
12. Set the DC voltage source (Vs) to -400 mV. Wait 3 seconds. Check the logic
level of the corresponding digital channel in the display.
If the channel is a static logic level high, change the DC voltage source Vs
to -500 mV.
13. Increment Vs by +10 mV. Wait 3 seconds and check the logic level of the
corresponding digital channel in the display. If the channel is at a static logic
level high, record the Vs value as in the 0 V row of the test record.
If the channel is a logic level low or is alternating between high and low,
repeat this step (inc rement Vs by 10 mV, wait 3 seconds, and check for a static
logic high) until a value for V
s-
is found.
14. Push the Slope lower-bezel button to change the slope to Falling.
15. Set the DC voltage source (Vs) to +400 mV. Wait 3 seconds. Check the logic
level of the corresponding digital channel in the display.
If the channel is a static logic level low, change the DC voltage source Vs
to +500 mV.
16. Decre
ment Vs by -10 mV. Wait 3 seconds and check the logic level of the
corresponding digital channel in the display. If the channel is at a static logic
level low, record the Vs value as V
s+
in the 0 V row of the test record.
If the channel is a logic level 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.
17. Find the average, V
sAvg
=(V
s-
+V
s+
)/2. Record the average as the test result
in the test record.
Co
mpare the test 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.
18. The remaining part of this procedure is for the +4 V threshold test. Push the
front-panel D15-D0 button. The Thresholds menu should display.
50 MSO4000 and DPO4000 Series Specifications and Performance Verification

Tektronix MSO2000 series Specifications

General

Brand	Tektronix
Model	MSO2000 series
Category	Test Equipment
Language	English