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HP 5335A - Page 22

HP 5335A
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Operation
and
Programming
3-42.
Within
the
FUNCTION
group,
the
rightmost
column
contains
four
keys
assigned
miscellaneous
functions.
3-43.
The
RESET
key
will
reset
the
counter
and
start
a
new
measurement.
When
pressed,
all
segments
and
decimal
points
in
the
display
should
light,
momentarily.
RESET
will
not
affect
any
current
function
selection
or
key
set-ups.
If
you
are
currently
in
GATE
TIME
or
TRIG
LEVELS,
pressing
RESET
returns
you
to
the
function
you
were
previously
in.
3-44.
RANGE
HOLD
can
be
used
to
freeze
the
decimal
point
placement
and
exponent
value
of
the
display.
Least
significant
digits
are
allowed
to
"fall
off”
the
right
of
the
display.
However,
the
display
is
programmed
to
avoid
a
loss
of
the
most
significant
digit.
RANGE
HOLD
is
useful
when
the
value
in
the
display
is
rapidly
changing
in
magnitude.
In
the
PHASE
A
rel
B
mode,
RANGE
HOLD
will
select
and
maintain
the
0°
to
360°
measurement
display
range.
RANGE
HOLD
toggles
on
and
off
with
each
press
of
the
key.
3-45.
The
EXT
ARM
ENABLE
key
is
used
to
enable
or
disable
external
arming
of
measurements.
When
it
is
on,
the
Start
and/or
Stop
of
the
measurement
can
be
armed
via
a
signal
connected
to
the
rear
panel.
When
off,
the
counter
ignores
the
rear
panel
signal.
EXT
ARM
ENABLE
toggles
on
and
off
with
each
press
of
the
key.
3-46.
The
CHECK
key
puts
the
instrument
into
one
of
two
levels
of
self-check
routines.
Pressing
the
key
once
will
enter
a
“lamp
test
loop”
flashing
all
front
panel
annunciators,
key
indicators
and
segments,
checking
the
MRC,
and
memory
circuits.
Pressing
and
holding
the
key
(for
approxi¬
mately
3
seconds)
will
place
the
instrument
into
an
extended
diagnostic
loop
of
several
major
circuits
(i.e.,
amplifiers,
time
base,
counting
circuitry,
and
display).
This
test
requires
that
the
user
connect
the
rear
panel
Time
Base
Out
to
the
Channel
A
input,
put
both
channels
to
500,
and
remove
any
signal
to
Channel
B.
See
Operational
Verification
section
for
further
details.
Any
failures
during
the
diagnostic
loop
will
result
in
the
display
of
either
a
numbered
FAIL
or
ERROR
message.
FAIL
messages
generally
indicate
a
circuit
failure.
ERROR
messages
indicate
the
user
has
attempted
an
improper
operation;
for
example,
a
misspelled
HP-IB
command.
Refer
to
ERROR
MESSAGES,
paragraph
3-229.
To
exit
either
self-check
routine,
press
any
other
function
key.
-6
Model
5335A

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