HP 8508A - Page 36

Operation
the
B
channel
residual
noise
level
of
around
10uV
when
the
probe
is
not
connected.
7.
DUAL-CHANNEL
MEASUREMENT
. |
The
HP
8508A
can
display
the
ratio
of
the
signals
in
its
two
channels,
making
it
unnecessary
to
calculate
the
results
of
ratio
measurements.
;
Connect
the
two
probes
to
the
source
output
using
a
tee,
as
shown
in
the
following
diagram.
Source | HP8508A
*A’ input .“B" Input
Cable (step 9)
Figure 3-5. Two Probe Connection
Select
[DISPLAY]
UNITS
to
display
the
levels
as
voltages.
(The
A
and
B
voltages
in
Displays
1
and
2
respectively
should
read
approximately
the
same
value.)
Press
[B/A
MAG]
to
show
the
voltage
ratio
of
B
to
A
in
Display
1.
The
reading
should
be
approximately
1.0.
Display
2
should
be
off.
Press
[B-A
PHASE]
to
display
the
input
phase
difference
in
Display
2.
The
reading
should
be
approximately
0
deg.
8.
SET
A
REFERENCE
Press
[SHIFT]
then
[SAVE
REF]
to
store
the
current
measurement
as
a
refererice
and
normalize
readings
to
the
saved
reference
value.
The
displays
should
now
read
exactly
1.0
magnitude,
and
0.0
deg
phase.
NOTE: DISPLAY 1 reads 1.0 [REL] and
DISPLAY 2 reads 0.0 [DEG] [REL]
3-12
|
E1089
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