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d.
Press the
RESOLUTION
f
key
five
times, verifying that the display
resolution
decrements
by
one
digit
each key
press
e.
Press the
RESOLUTION
t
key
to
increase the resolution
to
nine display
digits
2. 9.
1.3
As
required, the following additional
tests
may
be
performed
using the
1994's special functions.
Make
sure the
1994
is
in
the
Check mode
before executing
these
tests.
a.
Press
key sequence
<71>
SHIFT
STORE
SF SHIFT
SF.
Verify that
all
LEDs,
except
those
for
TRIG
A,
TRIG
B,
GATE,
and
STBY,
flash
on
and
off
every
two
seconds.
b.
Press
key sequence
SHIFT
SF. Verify that
SF
LED
is
not
lit
c.
Provide
a
500
coaxial
test
lead
fitted
with
BNC
connectors.
The
lead
should be 60
cm
to
lm
long,
d.
Using
the coaxial
test lead,
connect
the 10
MHz
STD.
OUTPUT BNC
(see
Figure
3.2)
on the
rear
panel
to
the front-panel Input
A
connector
e.
Press
key sequence
<77>
SHIFT
STORE
SF SHIFT
SF.
This
test
verifies the
proper operation of
Input
A's
input
relays.
Confirm
that
the display
shows
*0.
*******
q
W
here
*
is
a
blanked
digit.
The
XI
0,
500,
DC, FILTER,
and
COM
A
LEDs
for Input
A
should
light in
turn
f.
Disconnect
the coaxial lead
from
Input A.
The
display
should
show
an
error
number
after a
few
seconds.
See
Table
3.14 for error
codes
g.
Press
key sequence
SHIFT
SF.
Verify that
SF
LED
is
not
lit
h.
Using
the
same
test lead,
connect
the 10
MHz
STD.
OUTPUT BNC
to
the front-panel
Input
B
connector
i.
Press
key
sequence
< 78 >
SHIFT
STORE
SF
SHIFT
SF.
This
test
verifies
the
proper operation
of Input
B's
input relays.
Confirm
that
the display
shows
*Q.
*******
q
hz
as
i
n
s
tep
d.
The XI
0,
5Q£1,
and
DC
LEDs
for Input
B
should
light in
turn
j.
Disconnect
the
coaxial lead
from
Input
B and
the
10
MHz
STD.
OUTPUT
BNC.
The
display
should
show
Er
56
k.
Press
key
sequence
SHIFT
SF.
Verify that
SF
LED
is
not
lit
l.
Turn
the
1994
off
2-18
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