Tektronix P6248, Руководство по обслуживанию

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Performance Verification
P6248 1.7 GHz Differential Probe Service Manual
9
Differential Signal Range
This procedure directly verifies the differential signal range and indirectly
verifies the common-mode signal range.
1. Connect the probe as shown in Figure 5. Use the adapters and patch cords as
necessary to make the connections. Use square pins to connect the ground
lead and y-lead to the power supplies.
-- +
Digital multimeter
-- +
Digital multimeter
1103
-- +
Calibrated DC
voltage source
(Common-
mode source)
-- +
Calibrated DC
voltage source
(Differential-
mode source)
P6248
CH 1
input CH 1
output
Female BNC-to-male
banana adapter
50
Ω
precision
terminator
50
Ω
BNC cable
Ground lead
Y-lead adapter
Black (--) Red (+)
Figure 5: Setup for differential-mode tests
2. Set the probe to
÷
10 attenuation.
3. Set the common mode source to 7.0 V
±
50 mV.
4.
Set the differential mode source to 8.5 V
±
100 mV. Record the actual voltage
as V
in
.
5. Measure and record the output voltage as V
out
.
6. Calculate attenuation as V
in
÷
V
out
.