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Performance veri
fi
cation
Composite offset and gain
test
Perform this procedure to check that Composite signal output offset and gain for
SD signals are adjusted to within speci
fi
cation. This test should be performed in
factory mode. (See page 19,
1.
Connect the BNC-to-Banana-plug adapter to the voltmeter.
2.
Connect the BNC T to the adapter.
3.
Connect a 75
Ω
precision terminator to one end of the BNC T connector.
4.
Connect a 75
Ω
BNC cable to the other end of the BNC T connector.
5.
Connect the other end of the cable to the
CMPST 1
output on the SPG8000.
Figure 19: Setup for Composite offset and gain test
6.
Set the CMPST 1 and CMPST 2 signals to NTSC as follows:
a.
Press the
CMPST
button on the SPG8000 until you see
CMPST 1 : FORMAT
on the menu.
b.
Use the left (
◄
) or right (
►
) arrow button to select
NTSC
.
c.
Press the
ENTER
button.
d.
Repeat the previous substeps for the
CMPST 2
output.
7.
Press the
CMPST
button until you see
CMPST 1
on the menu.
8.
Use the up (
▲
) arrow button to select
CALIBRATION
.
9.
Use the right (
►
) arrow button to select
DAC Offset (0 V DC)
.
10.
Press the
ENTER
button.
11.
Record the voltmeter reading in the test record. This is the offset value.
12.
Use the right (
►
) arrow to select
DAC Gain (700 mV DC)
.
13.
Press the
ENTER
button.
14.
Record the value in the test record.
15.
Calculate the difference between the 700 mV and 0 mV signal levels and
record this in the test record.
16.
Repeat steps 7 through 15 for CMPST 2.
70
SPG8000 Speci
fi
cations and Performance Veri
fi
cation
Содержание Tektronix SPG8000
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Страница 12: ...General safety summary vi SPG8000 Specifications and Performance Verification...
Страница 14: ...Preface viii SPG8000 Specifications and Performance Verification...