Performance Verification
12. Set the channel
threshold to +4 V as follows:
a. Push the front-panel D15-D0 button.
b. Push the Thresholds lower-bezel button.
c. Turn the Multipurpose a knob to select channel D0.
d. Push the Fine front-panelbuttontoturnoffthefine adjustment.
e. Turn the Multipurpose b knob and set the value near 4.00 V (4 V/div).
f. Push the Fi
ne buttontoturnthefine adjus tment on again.
g. Turn the Multipurpose b knob and set the value to exactly 4.00 V
(4 V/div)
.
13. Set the DC voltage source (Vs) to +4.4 V. Wait 3 seconds. Check the logic
level of
the channel D0 signal display.
14. Decrement Vs by -10 mV. Wait 3 seconds and check the logic level of the
channe
l 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.
15. Push the front-panel Trigger Menu button.
16. Clic
kthelower-bezelSlope button to change the slope to Rising.
17. Set the DC voltage source (Vs) to +3.6 V. Wait 3 seconds. Check the logic
lev
el of the channel D0 signal display.
If the signal level is a static logic high, change the DC voltage source Vs to
+3
.5 V.
18. Increment Vs by + 10 mV. Wait 3 seconds and check the logic level of the
c
hannel D0 signal display. If it is a static logic high, record the Vs value as
V
s-
in the 4 V row of the test record.
If the signal level is a logic low or is alternating betwe en 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.
19. Find the average using this formula: V
sAvg
=(V
s-
+V
s+
)/2. Record the average
as the test result in the test record.
MSO4000B and DPO4000B Series Specifications and Performance Verification 77
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