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INITIAL
SWITCH-ON
4
Switch on
the
controller
and
other
devices,
including the 2151,
and
proceed
with the
functional
check
as described in Section
3
if
this
has
not
been done
already.
NOTE:
References within the operating
instructions,
i.e.
(Ref.
Al)
or
(Ref.
Bl), refer
to
command
descriptions
in
TABLE
4.13a
to
TABLE
4.13d
or
TABLE
4.14a
to
TABLE
4.14k,
in this
section
of
the
manual.
FREQUENCY
MEASUREMENT
-
INPUT
A
5
(1)
Selectlnput
A
using
the
command
"FRQAx",
(Ref.
Bl).
NOTE:
"x"
is
a
number
entered,
in
the
range
3 to
10, to set
the
reading
resolution.
Gate time
is
related
to
the resolution
selected.
If
omitted the previously
set
resolution
will
be
used.
(2)
If
a
frequency
below
50
kHz
is
to
be
measured
in the
presence
of
HF
noise, select
the
low-pass
input
filter
using
the
command "FILTA
ON". The
command
"FILTA
OFF"
switches the
filter
off,
(Ref.
B9).
CAUTION:
SIGNAL
LEVEL
ENSURE THAT THE INPUT
SIGNAL
LEVEL DOES
NOT
EXCEED THE
DAMAGE
LEVELS
SPECIFIED
IN
SECTION
1
OF
THIS
MANUAL.
(3)
If
the
x20 Attenuator
is
required, use the
command
"ATTENA
ON". The
command
"ATTENA
OFF"
switches the attenuator
off,
(Ref.
B8).
(4)
Connect
the signal
to
be
measured
to
INPUT
A.
(5)
If
HOLD
mode
operation
is
required,
use the
command
"HOLD
ON",
(Ref.
Bll).
To
take
a
measurement,
use
the
"ME
AS?"
or
"*TRG"
(Ref.
A
14)
command.
(a)
"MEAS?"
(Ref.
B12)
automatically places the
result in
the instrument's
output
queue ready
for
reading.
(b)
If
"*TRG"
(Ref.
A14)
is
used, then
send "DISP?"
(Ref.
B13)
to
place the
reading
in
the
output queue.
2151
OPS
A1571/DA
4-3
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