Performance Tests
4–42
TDS 500B, 600B and TDS 700A Service Manual
measurement column of Table 4–5. Note that these numbers may be
either positive or negative.
l. Add the first CH1 to CH2 skew measurement to the second CH1 to CH2
skew measurement and divide the result by 2. Use Table 4–5.
m. Add the first CH1 to CH3 (AX1 on the TDS 520B, 620B, 680B, and
724A) skew measurement to the second CH1 to CH3 skew measurement
and divide the result by 2. Use Table 4–5.
n. Add the first CH1 to CH4 (AX2 on the TDS 520B, 620B, 680B, and
724A) skew measurement to the second CH1 to CH4 skew measurement
and divide the result by 2. Use Table 4–5.
o. Check against limits: CHECK that the largest of the three results from
steps l, m, and n is between –100 ps and + 100 ps for the TDS 600B or
between –50 ps and + 50 ps for the TDS 500B/700A.
p. Enter time on the test record.
Table 4–5: Delay Between Channels Worksheet
Coupling
First
Measurement
Second
Measurement
Add First and
Second
Measurements
Divide Sum
by 2
CH1 to CH2
skew
CH1 to CH3
skew
CH1 to CH4
skew
3. Disconnect the hookup: Disconnect the cable from the generator output at
the input connectors of the channels.
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