LeCroy DA18000AC, Instruction Manual

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Performance Verification
DA18000AC-OM-E Rev A
7-5
l. Record the measured 20-80% rise time as “Source rise time” (t
source
) in the Test
Record (Figure 7-4).
Only the positive edge is measured. The difference in rise time between the positive
edge and the negative edge of the STD-20 TDR is less than 1 ps.
m. To measure the amplifier’s rise time, disconnect the coaxial cable and PLPA-K adapter
from Channel 1 of the SDA 18000 and connect the cable only to the + input of the
DA18000AC amplifier. Connect the cable from Channel 2 TDR to the – input of the
amplifier.
n. Measure the 20-80% rise time and record the measurement as “System rise time”
(t
system
) in the Test Record.
o. Calculate the amplifier’s rise time:
Figure 7-4Rise Time Measurement
p. Record the calculated rise time as “Amplifier Rise Time” in the Test Record.
q. Verify that the calculated rise time for the DA18000AC is less than 19 ps.
This concludes the Performance Verification Procedure.
###
Amplifier Rise Time, t
r
t
system
( )
2
t
source
( )
2
– =