Wavetek 3000 - Option 1 B Schematics and Parts Lists; Operation Check

OPTION 1B
A power meter can be used to
check the RF level over a range
of
0 to 30 dB ; whereas, a
spectrumanalyzer is required to
check the entire 0 to 90dB range .
With a power meter
or spectrum
analyzer connected to the instrument RF
OUT connector, set the front-panel
attenuators for a convenientreference
on
the powermeter or analyzerwith
remote programming set for 0 dB ; then
step
through remote programming in 10
dB steps
from
0
to
90
dB . The output
should be
within accuracy
specifications as given for this
option .
The following procedure is recommended
to
insure proper operation of the
Protection Circuit . The top covermust
be removed
from the instrument .
With instrument operatingnormally
at
100 MHz in the CW mode, connect a 50
0
detector to the instrument RF OUT
connector and set output level to +5
dBm . Monitor the detectorDC output on
a suitable oscilloscope .
Circuitry in AttenuatorDriver M42 is
checked by pushing the momentaryswitch
located on top of the module . This
switchlowers the trip level of the
module . While holding the
switch
closed, use the
front-panel OUTPUT
VERNIER
to slowly increase
outputlevel
until the Protection
Circuit

trips
.
This causes the
UNLEVELED lamp to
flash, and the oscilloscope
to go to
zero .
The circuit can be resetby
momentarily
turning the AC
POWER switch off .
Perform
the
same
test
at 500 MHz . At
100 MHz, the protection
circuit should
trip

at
+7
.5 dBm _+1 dB ;

whereas,

at
500 MHz, it should trip at an output
level of +10 .5 dBm
_+2
dB .

Additional
tests can be performedas desired . For
example, VSWR and insertion loss can be
checked in the same manner as any
passive device .
Also, if available, a
high-power RF-signal source, set for an
output

of

slightly over 0 .7 W,, can be
used to
verify Protection Circuit
operation .
SCHEMATIC AND PARTS LIST
The Option
1B Schematic andapplicable
Parts
Lists are
included in this
section .