Electrical Sampling Modules
f.
Select the Measurement tab in the Setup dialog box menu. Set up
Meas4
as follows:
Choose
Select Meas > Pulse-Amplitude > Mean
.
Choose
Source1
and select
M1
in the Source.
g.
Set the time/div to
20
μ
s/div
(use the Horizontal Scale knobs).
h.
Select
Meas3
from the Measurement tab in the setup dialog box menu,
select the
HiLow
tab, and unselect the
Track Hi
and
Track Low
boxes.
i.
Repeat step h for
Meas1
.
j.
Change the Horizontal Scale to
50 ps/div
while adjusting Horizontal
Position, keeping the rising edge of the
fi
rst step waveform on screen.
k.
Push the front panel
FINE
button to turn it on.
l.
Adjust the horizontal position such that the incident edge 50% crossing
occurs one division in from the left edge of the screen.
m.
Push the front panel
FINE
button to turn it off.
n.
In the Horizontal Setup dialog box, set Horizontal Reference to
10%
.
o.
Select the following measurements from the Setup dialog box menu and
set them up as follows:
Meas1.
Select the
Region
tab and set G1 to
10%
(approximately
50% edge crossing threshold),
G2
to
40%
(150 ps), and select the
Gates
On
box.
Meas2.
Select the
Region
tab, select the Gates
On
box, set
G1
to
slightly before the observed location of the maximum overshoot, and
set
G2
to
40%
(150 ps).
NOTE.
Meas1 now reads overshoot directly on-screen. Meas4 now reads
undershoot directly on-screen.
p.
Check that the TDR incident edge aberrations in the range of 14 ps to
150 ps after the edge are within speci
fi
cation:
Aberration Upper Spec limit (USL): Meas1 +Overshoot(C1)
≤
20%.
Aberration Lower Spec limit (LSL): Meas4 Mean(M1)
≥
–2%.
DSA8300 Performance Veri
fi
cation
215
Содержание 80A00
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Страница 213: ...Electrical Sampling Modules Figure 21 Setup to measure Power in DSA8300 Performance Verification 195 ...
