HP 8510 User Manual

Using the Port 1 and Port 2 Attenuators
The Port 1 and Port 2 step attenuators are used to adjust the signal level into the mixers and
thus protect the mixers from excessively high signal levels. Note that the attenuators do not
change the Port 1 or Port 2 signal levels.
Controlling the Attenuators
Set the step attenuators as follows.
Press 4
STIMULUS MENU
5
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
POWER MENU
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
ATTENUATOR PORT: 1 or
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
ATTENUATOR PORT: 2 .
Use the knob, STEP keys, or numeric entry to set the attenuator from 0 dB to 90 dB in 10
dB steps. Familiarize yourself with op eration of the step attenuators by measuring the user
parameters.
Measure User Parameters and Set Attenuators
In order to maintain specied p erformance, the IF signal levels are less than 0 10 dBm as
measured
b
y
the
user
parameters.
Connect
an
appropriate
device
at
P
ort
1
or
Port
2for
each
measuremen
t,
turn
on
a
measuremen
t
mark
er, then
measure the
user parameters
in order
to
v
erify the
IF signal
levels
as follo
ws.
Press
4
P
ARAMETER
MENU
5
N
N
N
N
N
N
N
N
N
N
NN
NN
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
USER
1
a1
and
observ
e
the
IF
signal
lev
el
in
the
LOG
MA
G
format.
Press
N
N
N
N
N
N
N
NN
N
N
N
N
N
N
N
N
N
N
N
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N
USER
4
b1
and
observ
e
the
IF
signal
lev
el.
If
either
a1
or
b1
is
greater
than
0 10
dBm
at
an
y
p
oin
t
in
the
trace,
increase
the
A
TTENUA
TOR
POR
T:
1
v
alue.
Press
N
N
N
NN
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
USER
3
a2
.
N
N
N
N
N
N
N
N
N
N
N
NN
NN
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
NN
NN
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
REDEFINE PARAMETER
N
N
N
N
N
N
N
N
N
N
N
NN
NN
N
N
DRIVE
N
N
N
N
N
N
N
N
N
N
N
NN
NN
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
NN
NN
N
DRIVE: PORT
2
.
Observ
e
the
IF
signal
lev
el.
Press
N
N
N
N
N
N
N
N
N
N
N
N
N
N
NN
NN
NN
NN
N
N
N
N
N
N
N
USER
2b2
and observ
e the
IF signal
lev
el.
This
sho
ws
the
lev
el
with
the
signal
applied to Port 1. If either a2 or b2 is greater than 0 10 dBm at anypoint in the trace,
increase the
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
ATTENUATOR PORT: 2 value.
In some applications it may be necessary to measure the signal at b2 with the signal applied
to Port 2. For this measurement:
Press
N
N
N
N
N
NN
N
N
N
N
N
N
N
N
N
N
N
NN
N
N
N
N
N
N
N
N
N
USER
2
b2
.
N
N
N
N
N
N
N
N
N
NN
N
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N
N
N
N
N
N
N
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N
NN
N
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N
N
N
N
N
N
N
NN
N
N
N
N
N
N
N
N
N
N
N
NN
N
N
N
N
N
N
N
REDEFINE PARAMETER
N
N
N
N
N
N
N
N
N
NN
N
N
N
N
N
N
DRIVE
N
N
N
N
N
N
N
N
N
NN
N
N
N
N
N
N
N
N
N
N
N
NN
N
N
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N
N
N
N
NN
N
N
N
N
N
DRIVE: PORT 2
.
Observe the IF signal lev
el.
Before calibration, measure these user parameters with the calibration standards, then with
the device under test connected and op
erating.
Generally, set the attenuators to obtain the maximum p ossible mixer input signal level
(less than 0 10 dBm) with the device connected and operating. This will provide the b est
signal-to-noise
ratio
for
the
measuremen
t.
Then
remo
v
e
the device
and
p
erform
measuremen
t
calibration.
F
or
best
accuracy
,
do
not
c
hange
either
atten
uator
b
et
w
een
calibration
and
measuremen
t.
High
P
o
w
er
Measurements
10-5

HP 8510 Specifications

General

Brand	HP
Model	8510
Category	Measuring Instruments
Language	English