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CT Systems Wavetek 2500 - Page 52

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3.4.9
Measuring
Transmitter
Power
and
Frequency
Error
The
built-in
100
watt
power
meter
automatically
switches
the
Model
2500
into
a
monitor
mode
if
approximately
200
roW
or
greater
is
keyed
into
the
RF
In/Out
connector.
This
not
only
protects
against
circuit
damage
from
accidental
keying,
it
also
provides
for
"hands
off"
switching
into
monitor
mode
for
simultaneous
display
of
transmitter
power
and
some
other
selectable
parameter,
i.e.,
frequency
error.
NOTE
The
Model
2500
is
what
is
presented
consideration
the
used
to
hook
up
errors,
use
only
length
required.
designed
to
take
transmitter
measurements
based
on
at
the
RF
IN/OUT
port.
The
user
must
take
i
nto
potential
inaccuracies
introduced
by
the
cables
the
system
under
test.
To
reduce
cable-related
good
quality
50
ohm
coax
cables
of
the
minimum
Refer
to
Figure
3-11
for
the
following
test
procedure.
1)
Connect
RF
output
of
the
transmitter
to
"RF IN/OUT"
of
Model
2500.
2)
Select
REC
mode.
(If
in
GEN
mode,
unit
will
automatically
switch
to
REC
when
power
is
keyed
into
unit.)
3)
Program
transmitter
frequency
on
monitor
in
MHz
using
numerical
keys
followed
by
ENTER
key.
4)
To
prevent
overheating
the
instrument,
see
the
warning
below,
for
applying
power
to
the
wattmeter.
5)
Key
the
transmitter.
The
2500
will
display
power
in
watts
(up
to
100
watts).
6)
Se
l
ect
COUNT
ERROR"
and
read
frequency
error
on
display.
NOTE:
WARNING:
2500-MANUAL
The
Model
2500
switches
to
the
watts
mode
when
power
is
initially
keyed
in.
In
order
to
r·ead
frequency
error,
the
COUNT
ERROR
mode
must
therefore
be
selected
after
the
power
is
keyed
in.
The
power
meter
is
designed
to
dissipate
10
Watts
continuously.
Restrict
application
of
higher
power
<<lOOW>
to
1
minute
after
10
minutes
of
cool
down.
PAGE
40
SECTION-3