Frequency Measurement; Input A; Input B - Racal Instruments 2151 Manual

FREQUENCY MEASUREMENT
-
INPUT B
6
(1)
Select
Input
B
using
the
command
"FRQB
x", (Ref.
B2).
NOTE:
"x"
is
a
number
entered,
between
3
and
10, to set the
reading
resolution.
Gate
time
is
related
to
the resolution
selected.
If
omitted the previously
set
resolution
will be used.
CAUTION: SIGNAL
LEVEL
ENSURE THAT THE INPUT
SIGNAL
LEVEL DOES NOT EXCEED THE DAMAGE
LEVELS
SPECIFIED IN
SECTION
1
OF
THIS
MANUAL.
NOTE: INPUT
B
is
fused, see
SECTION
1 of this
manual.
(2)
Connect
the signal
to
be
measured
to
INPUT
B.
(3)
If
HOLD
mode
operation
is
required,
use the
command
"HOLD
ON",
(Ref. Bll).
To
take a
measurement,
use the
"MEAS?"
or
"*TRG" command.
(a)
"MEAS?"
(Ref.
B12) automatically
places the result
in
the
instruments output
queue.
(b)
If
"*TRG"
(Ref.
A14)
is
used,
then send "DISP?"
(Ref.
B13)
to
place
the reading
in
the output queue.
(4)
To
return
to
continuous measurement
mode
send
"HOLD
OFF".
FREQUENCY
ME ASUREMENT
-
INPUT
C
(2151
ONLY)
Normal
Automatic
Mode
7
(1)
Select
Input C
using
the
command "FRQC
x", (Ref. B3).
NOTE:
"x"
is
a
number
entered, see
Technical
Specification or Ref.
B3,
to set
the
reading
resolution.
Gate
time
is
related
to
the resolution selected
and
the
input
frequency.
If
omitted the previously
set resolution will
be
used.
CAUTION: SIGNAL LEVEL
ENSURE THAT THE
INPUT SIGNAL LEVEL DOES NOT EXCEED THE
DAMAGE
LEVELS
SPECIFIED IN SECTION
1
OF
THIS
MANUAL.
(2)
Connect the
signal
to
be
measured
to
INPUT
C,
(3)
If
HOLD
mode
operation
is
required, use the
command
"HOLD
ON",
(Ref.
Bll).
To
take a
measurement,
use the
"MEAS?"
or
"*TRG" command.
(a)
"MEAS?"
(Ref.
B12) automatically
places the result
in
the instrument's output
queue.
4-4
2151
OPS
A
157
1/DA