Help
4-5
Error
Time Base
A
time base input
is
provided on the rear panel of the
HP
8901B.
This
input allows you to connect the
HP
8901B
to
an external
10
MHz
time base reference. The time base
circuitry
within the
HP
8901B
automatically switches to the external time base and
turns
off
its time
base output when an external time base of sufficient amplitude
(0.5
Vpp)
is applied at the input. To verify that an external time base is being
used, key in
15.1
SPCL.
The instrument
will
display a
1
if
the external
time base
is
being used or a
0
if
the internal time base
is
being used.
Input
Operating
Problem Problem
08,
10, 13,
34
or
35
01,
09,
12, 14, 15,
18,
20
thru
24,
or
26
Solving Measurement
Problems
The
HP
8901B has been designed to feed back information about its
operating status. When the
HP
8901B detects that the input signal
or operating conditions are preventing it from making an accurate,
reliable measurement, it alerts you by placing an error or dash
code in its display. The circumstances that can cause the
HP
8901B
to display an error code are classified into one of
two
categories:
0
Input Problem
-
caused by input signal conditions, or
0
Operating Problem
-
caused by the selection of incompatible
operating functions.
Certain errors are caused
only
by
an input problem,
other errors are caused
only
by
an operating problem,
and some errors can be caused by either.
The errors that can be caused
only
by
an input problem
and the errors that
can be caused
only
by
an operating problem
are listed in
the
following chart.
If
your instrument
is
displaying one of these errors, proceed directly to
Table
4-3.
RF
Power Error Codes and take the recovery
action recommended.
If
you
did
not find your error listed in the chart, or
if
your instrument
is displaying dashes or a questionable measurement, perform the
following procedure.
function settings that can cause the
HP
8901B to display an error code.
the
AUTOMATIC OPERATION
key with the conditions described
below. After you have identified the description that best fits your
instrument’s condition, take the action recommended for that condition.
1.
Press the green
AUTOMATIC OPERATION
key.
This
cancels all
2.
Compare the operating status
of
your
HP
8901B
after pressing
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