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3-7
Testing Performance
To verify digital channel threshold accuracy
1
Turn on the test equipment and the oscilloscope. Let them warm up for
30 minutes before starting the test.
2 Set up the oscilloscope calibrator.
a Set the oscilloscope calibrator to provide a DC offset voltage at the
Channel 1 output.
b Use the multimeter to monitor the oscilloscope calibrator DC output
voltage.
3
Use either method 1 or method 2, described in the following, to connect
the digital channels for testing.
a Method 1 — Using the Test Connector
Use the 8-by-2 test connector and the BNC cable assembly to connect digital
channels D0-D7 to one side of the BNC Tee. Then connect the D0-D7 ground
lead to the ground side of the 8-by-2 connector. See figure 3-2.
Figure 3-2
Setting Up Equipment and Test Connector for the Threshold Test
Measure time
Save/Recall
Entry
Mixed Signal Oscilloscope
54620A
16 CHANNEL 500 MSa/s
STORAGE
TRIGGERHORIZONTAL
CHANNEL
IN PU TS
Line
Time/D iv
Select
Trig ger out
!
Delay
Positio n
Ext t rigge r in
!
!
t
hr
es
h.
cd
r
HP 34401A
Test
Connector
BNC-Banana
cable
Channels 8 - 15
Channels 0 - 7
Oscilloscope
Calibrator
Digital
Multimeter
service.book Page 7 Wednesday, December 18, 2002 8:35 AM