Fluke 93 Service Manual page 77

4-8
PERFORMANCE
VERIFICATICMM
PROCEDURE
14/15/16/17. Trigger
sensitivity
channel
A
and
B
The
trigger
sensitivity
depends on
the
amplitude
and frequency
of
the
trigger
signal.
This
test
checks
the trigger sensitivity of the
ScopeMeter. Also
the
•hSLOPE/>SLOPE
furrction
(triggering
on
negative slope)
1$
tested
for
both
channels
A
and
B.
Channel B
is
tested
first.
Test
equipment:
Tektronix
SG
503
Constant Amplitude Sine
Wave
Generator
Test setup:
Procedure/requlrementsfor channel B
trigger seneftivHy
measurement:
A
Apply
3
100
MH
2
sine
wave,
with
an amplitude
of
approximately 500
mV
peak'to-peak
to
channel
B.
Use
a
50Q
termination.
6
Adjust the amplitude
of
the input signal
to
exactly
4
divisions on the
display.
C
Verify that the signal
Is
well triggered.
D
Apply
8
60
MHz
sine
wave,
with
an
amplitude
of approximately
1
00
mV
peaK-io-peak
to
channel
B.
Use
a
500
termination.
£
Adjust the amplitude
of the Input signal to
exactly
1
.5
divisions
on
the display.
F
Verify that
the signal
Is
well triggered.
G
Apply a 10
MHz
sine
wave.
wHh an
amplitude
of
300
mV
peak-to-peak
to
channel
8.
Use
a
500
termination.
H
Adjust the amplitude
of
the Input signal
to
exactly
1
.5
divisions,
on
the display.
I
Verify that the signal
is
well triggered
on
the falling
edge. See
figure 4.5.
Figure 4.5 S/gnai triggered
on
the
failing
(negative)
edge