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Switch between 50
S
DC and
GND, and
1
MS
DC and GND.
Check:
-
the trace
should
not move more than a
minor division
or
1
mV
Repeat
the
same
test for CH2.
5
Input Impedance
Set the
DSO CHI input
to
1
MS
DC with any time base and gain.
Check with
an ohmmeter:
-
input impedance must be
1
MS
±
2
Set
DSO CHI input
to
50
S,
20
mV/div with any time
base.
Check:
-
input impedance must be 50
S
±
2%
Repeat
50 S test for
50,
100, 200,
500 and 1000 mV/div.
Repeat all impedance checks
for CH2.
6
Front-End
Set the
DSO
as follows:
-
turn on the trace for CHI
-
Grid normal
-
Input 50
S,
gain
100 mV/div, offset zero
-
Trigger:
SMART (COMPLEX) Trigger: OFF
Source:
CHI
Coupling:
DC
Mode:
NORM
Delay:
50%
Level:
zero
-
Time/div
=
.1
psec/div
-
BWL OFF
Apply
a
600 mV peak-to-peak
1
MHz square wave from a fast (less than
1
nsec) risetime function generator (for example
TEK
PG502)
to
CHI input.
Press
the
Interleaved Sampling button
on the
oscilloscope
to
turn on
the
RIS
mode.
3
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