Performance Veri
fi
cation
Compare 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.
19.
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.
20.
With the Fine front-panel button turned off, turn Multipurpose knob
a
to set
the D7–D0 threshold value to
4.00 V
(+4.0 V/div).
21.
Turn Multipurpose knob
b
to set the D15–D8 threshold value to
4.00 V
(+4.0 V/div). To remove the menu from the display, push the front-panel
Menu Off
button.
22.
Set the DC voltage source (Vs) to +4.4 V. Wait 1 second. 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
+4.5 V.
23.
Decrement Vs by -10 mV. Wait 1 second 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 4 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 1 second, and check for a static
logic low) until a value for
V
s+
is found.
24.
Push the front-panel Trigger
Menu
button.
25.
Push the
Slope
lower-bezel button to change the slope to
Rising
.
26.
Set the DC voltage source (Vs) to +3.6 V. Wait 1 second. 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
+3.5 V.
27.
Increment Vs by +10 mV. Wait 1 second 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
V
s-
in the 4 V row of the test record.
If the channel is a logic level low or is alternating between high and low,
repeat this step (increment Vs by 10 mV, wait 1 second, and check for a static
logic high) until a value for
V
s-
is found.
28.
Find the average, 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.
29.
Repeat the procedure starting with step 12 for each remaining digital channel,
D1 through D15.
This completes the performance veri
fi
cation procedure.
28
DPO2000 and MSO2000 Series Speci
fi
cations and Performance Veri
fi
cation