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DA18000AC Differential Amplifier
PRELIMINARY PROCEDURE
1.
Allow at least 20 minutes warm-up time for the DA18000AC Differential Amplifier and
test equipment before performing the Verification Procedure.
2.
Turn on the other test equipment and allow these to warm up for the time recom-
mended by the manufacturer.
3.
While the instruments are reaching operating temperature, make a photocopy of the
Performance Verification Test Record (located in Appendix A), and fill in the necessary
data.
The warranted characteristics of the DA18000AC Differential Amplifier are valid at any tem-
perature within the Environmental Characteristics listed in "Specifications." However, some
of the other test equipment used to verify the performance may have environmental limita-
tions required to meet the accuracy requirements needed for the procedure. Be sure that the
ambient conditions meet the requirements of all the test instruments used in the procedure.
VERIFICATION PROCEDURE
Rise Time (20-80%)
Measuring the amplifier's rise time cannot be done directly, it has to be performed in an indi-
rect way. First you have to measure the rise time of the source, i.e., the rise time of the pulse
generator (TDRs) and the oscilloscope. Second, measure the rise time of the system: pulse
generator, amplifier, and oscilloscope. The rise time of the amplifier alone can then be deter-
mined from these two measurements.
ESD Sensitive: The inputs of the DA18000AC amplifier as well as
those of the oscilloscopes are sensitive to Electrostatic Discharge
(ESD). To avoid causing damage to the equipment, always follow anti-
static procedures (wear wrist strap, etc.) when working with these
CAUTION
instruments.
a.
Install the two ST-20 TDRs in Ch 1 and Ch 2 of the WE 9000 oscilloscope.
b.
To prevent accidental discharge of any accumulated charge in the coaxial cables,
attach a ÷2 attenuator to one end of each of the two type K coaxial cables before con-
necting the cables to the oscilloscope. This will provide a discharge path.
c.
Then connect the other end of each cable to the connector saver at the outputs of the
ST-20 TDRs.
When fastening a SMA or type K connector, always use the torque
wrench to tighten the connector.
CAUTION
Remove the ÷2 attenuator from the coaxial cables.
d.
e.
From the menu bar, select Timebase (Figure 7-1).
f.
Set the WE 9000 to output a differential step. This sampling oscilloscope is only used
to provide power to the ST-20 TDR pulse generators
g.
Initialize the TDR by touching the TDR Main tab.
7-2
DA18000AC-OM-E Rev A
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