Electrical Sampling Modules
3.
Push the
DEFAULT SETUP
front-panel button and click
Yes
.
4.
Set up the main instrument as follows:
a.
In the TDR Setup dialog box click
C1
Preset. This sets up Channel 1 (C1)
positive polarity by default; it will later be manually switched to select
negative polarity and for channel 2, during the test sequence.
b.
In the Acq Setup dialog box set the Acquisition Mode to
Average
,
128 samples
.
c.
In the Horz Setup dialog box:
Set Record Length to
2000 points
.
Set Position to
1
μ
s
.
Set Scale to
50
μ
s/div
.
d.
In the Meas Setup dialog box:
Select
Meas 1
and make sure the
Source1
button is selected.
Make sure the channel under test is selected in the Source tab, click
the
Pulse
Signal Type button, and then choose
Select Meas > Pulse –
Amplitude > Amplitude
, and check the
On
box.
Select the
HiLow
tab and uncheck
Track High
and
Track Low
in
the Tracking Method.
e.
Record for later use the High reference and Low reference measurement
values in m
ρ
, making sure to take down the proper sign. This will be used
as HiRef and LoRef (the high and low reference levels for aberration
measurements).
Test
Follow this procedure to make the aberration checks:
1.
Check aberrations in the range of 10 ns to 20 ps before the edge (aberrations
within ±1%).
a.
Set the Horizontal Position to its minimum setting using the Horizontal
position knob.
b.
Change the Horizontal Scale to
50 ps/div
while adjusting Horizontal
Position, keeping the rising edge of the
fi
rst step waveform on screen.
c.
Push the front panel
FINE
button to turn it on.
d.
Adjust the Horizontal Position knob so the waveform crosses the center
vertical graticule at the 10% (amplitude) point of the rising edge. Since
the waveform is 2 major divisions high at 500 m
ρ
/div, the waveform
should be crossing the center vertical graticule at 9 minor divisions below
the center horizontal graticule. This de
fi
nes the ending reference point for
pre-transition aberration measurements.
212
DSA8300 Performance Veri
fi
cation
Summary of Contents for 80A00
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