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9
Bandwidth
at
1
MS
Input Impedance
(at
Probe Tip)
The purpose of this
test
is to
ensure
that the
entire 9450 system
has
a
bandwidth
of at least 200 MHz at
probe
tip at
1
MS
input impedance.
Set
up a
Tektronix
SG 503
Leveled
Sine Wave Generator
or equivalent
(note for the Marconi that the
maximum amplitude
is
smaller
than
5
V):
-
Frequency
.5
MHz
-
Amplitude
5
V p-p
Terminate
the
output of
the SG 503
via
a 50 S
feedthrough and connect
it
to
the CHI input
through
a
300 MHz
10
MS
/10 probe
using
the
probe
tip
-
BCN
jack. Make
sure
the
probe has
a
300
MHz bandwidth
(for
example
our
model
P9020 M15xlOHF),
and
is
perfectly adjusted,
low
frequency and high frequency
(see
brochure enclosed with probe).
Turn off all
the traces
except
CHI.
Trigger:
SMART (COMPLEX)
Source:
Coupl
Mode:
Delay
Level
Set the input of CHI:
-
Coupl:
-
Gain:
-
Var:
-
Offset:
Trigger: OFF
CHI
HF
NORM
zero
zero
1
MS
AC
.1
V/div
Gain
1
zero
Set the
time base:
-
Time/div
-
Interleaved
.5
ysec/div
ON
Bandwidth limit OFF
Adjust
the SG 503
output amplitude
and the CHI offset
to
provide
a
5
division p-p sine wave.
Increase
the SG
503 frequency, while
decreasing
the
Time/div until
the
sine
wave p-p
amplitude
is
.7
*
5
divisions
=
3.5 divisions
(3
dB
point)
12
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