Fluke 8600A - Page 74

8600A
a. With equipment
as shown in
connection“A” ad-
just the
ac
signal
source for
an
output of
3
.000V
rms at 100 kHz
as measured on the DVM.
b. In
connection
“B”
with the
DVM set to measure
V dc, observe
a probe output of 3.15 to 2.85V
dc.
c. Placing cables back in connection
“A”, decrease
the ac signal source
by
10 db (0.95V
rms).
d. Moving back to connection
“B”,
observe
a
volt-
meter
indication of between 1 .00 and 0.90V dc
(10
db
down
from 3.0V dc).
e. In
connection
“A”,
decrease
the
ac signal source
an additional 10 db (to 0.3V
rms) as indicated by
the voltmeter
in its ac
function.
f. Back to
“B”,
observe
a
voltmeter reading
of
.315
to ,285V dc.
g.
Return
the ac
signal source back to 3.000V rms.
h. Repeat steps
a
through
g
with frequencies of
500
kHz, 1 MHz, and 10 MHz.
646
. HIGH
FREQUENCY
RESPONSE
647.
Connect equipment
to the 80RF-1 probe as
shown in
Figure
6-12, and perform
the
following steps:
a.
Set the ac signal
source to 100 MHz with an out-
put level of 10 milliwatts
as indicated on the power
meter. Ensure
that the
ac
signal source
has
stabilized at the 10
milliwatt output.
b.
Observe that
the voltmeter indication
is
between
0.757
and
0.657V
dc, (0.707V dc
corresponds to
10 milliwatts
into
50
ohms.)
c. Repeat the above for
frequencies of 200
MHz,
300 MHz, 400 MHz,
and 480 MHz.
648. CALIBRATION
649. Should
the
80RF— 1
require recalibration,
perform
the following
steps:
a.
Perform steps a and b in paragraph
644,
with a
frequency of 1 MHz.
b.
Observe the dc voltmeter;
a
reading below
3V
dc
calls
for
a
decrease
in the
value of
R3,
a reading
above 3V dc
calls for
an increase
in R3. Resistor
R3 should
be
a
1/8W
metal film type. In a
probe
that
is
working properly,
a
30 kfi
change
in R3
will produce
about a
1%
deviation in the reading.
Figure
6-12.
HIGH
FREQUENCY
RESPONSE CHECK
6-8