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Performance Veri
fi
cation
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-panel button to turn off the
fi
ne adjustment.
e.
Turn the
Multipurpose b
knob and set the value near
4.00 V
(4 V/div).
f.
Push the
Fine
button to turn the
fi
ne adjustment 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
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.
15.
Push the front-panel
Trigger Menu
button.
16.
Click the lower-bezel
Slope
button to change the slope to
Rising
.
17.
Set the DC voltage source (Vs) to +3.6 V. Wait 3 seconds. Check the logic
level 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
channel 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 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.
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 Speci
fi
cations and Performance Veri
fi
cation
77
Содержание DPO4000B Series
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