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\-
Models
423A/8410A
Figure
2.
Peak
Power
Measurement
c.
Replace the pulse source
with
a CW
generator
(step
2).
While
observing the
oscilloscope
trace,
ad-
just
amplihrde
of CWgenerator
output
tomake crystal
ouQut equal
to that
of
pulse generator
as indicated by
markings
on
graticule
(step
b).
d.
While performing
the
next step,
leave
CW
gen-
eratorat
settingobtainedin
step
c.
Disconnect
Detec-
tor
from CW generator.
Connect output
of
CW
gen-
eratorto atlermistor
and
power
meter.
Measure ad-
justed level
(step
c) of
CW
generator
output.
e.
The
peal
power
of
the
pulse
envelope observed
in
step
b is
equal
to
the output
power
of
the
CW
generator.
16.
REFLECTOMETER APPLICATION.
1?.
For information
about
reflectometer
systems
and
measrrements, see HP Application Notes b4
and
61
and
Ilewlett-Packard Journal
VoI.
12,
No.
4,
copies
of which
are available
upon request.
It.
HARMONIG
]REQUENCY-CONPARISON
NEASURENENTS.
19.
TheDetector
canbe
usedas
a
mixer inharmonic-
frequency comparison measurements.
See
Hp
Appli-
cation Note
2.
20.
REP1ACEMENT
OF
PARTS.
2
1.
Succeedingparagraphs
give
instructions for repair
of
the
Detector,
and
the
Option 02
Load
Resistor,
Model
11523A. Additional
maintenance
irdormation can
be
01613-8
Page
3
obtained
from your local Hewlett-Packard field office.
Stock numbers
for
replaceable
parts are
given
in
Table
2.
22.
The
detector
element assembly
includes
a
detec-
tor
element,
an
Option 02
load
resistor
for
the
11523.4,,
capacitivewasher
and
a
capsule
spacer. The resistor
is
to
load the diode
for
square-law operation,
the
ca-
pacitive washer
is
to
match the
diodefor
VSWR,
while
the
capzule spacer
is
mainly
for flatness
of
sensitivity.
AII
should
be
replaced
as
a unit
when
the
diode is
replaced.
23.
DETECTOR
ELEMEMT
REPLACEMEN'T.
WARNING
The special
detector element
(see
Figure
3)
contained
ia
the
Detector
can
be
damaged
in
handling, removal,
or
installation
if
certain
precautions are
not
taken. Thehandling
pre-
cautions
which follow should
be
read
before
performance
of any
operation with
the
detector
element when
it is
out
of either
the
housing
or
the
detector element shipping container.
24.
DETECTOR
ELEMENT
HANDLING
a.
Before instalting detector into mount,
touch
ex-
posed
metal
on mount
with your
hand
to
discharge
static
electricity.
Then
insert detector into
mount.
b.
When handing
crystal
to another person,
touch
hands
first
to
ensure
there
is
no
difference
in
static
electricity
potential
between you.
c.
Ohmmeters
should NOT
be
used
tomeasurefor-
ward-
and
back-resistance since
it is
rather
easy
to
damage
these
diodes.
(The
difficulty arises
because
of the
ohmmeter open-circuit voltages
and
short-
circuit currents.
It
is easy for
these currents
or
voltages
to
damage
the
diode.)
25.
REPLACING DETECTOR
ELEMENT.
26. Parts
mentioned
in
the following procedure
are
identified in Figure
3.
a.
Remove
connector cap from
body. To
remove
connector cap, use
a
pair of
gas
pliers
with plastic
teeth
or protect
body
with
heavy
paper
or
tape.
b.
Remove
old detector
element, eapsule
spacer,
and
capacitive washer,
and
discard
them.
c.
Install the new
capacitive
washer,
capsule
spacer,
and
detector element. Install
the
washer
first,
the spacer with
its
polyiron
side
against
the washer.
Finally, install
the
detector element by inserting
the
resistive
end
into
the
center
contact
inside
the
Detector
body.
cAuftoll
When
inserting the detector element, do
not
force the tip (resistive
end)
into the
center
conductor
in
the body as the fingers
of
the
center
conductor
might
be damaged.
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