HP 3575A - 5-13. High Level Accuracy Checks; 5-15. Shunt Capacitance Check

Section V
a. Connect test
equipment as shown
in
Figurc 5-2.
Note
that the
cable lengths
are critical and
must be as
specificd in
Figure
5-2.
b. Turn
on all equipment and
allow a warmup
period of
at least I hour before
proceeding.
c. Set the
3575 A cotrtrols as
follows:
DISPLAY*
. .
, AMPLITUDE
AMPLITUDE
FUNCTION.
.... ... ..
B
Voltage Range . 0.2 mV
-
2
V
(both
channels)
FREQUENCY RANGE .. .,1
tLz
-
t
kllz
PHASE REFERENCE ...... .. ... .. A
*
Options
001 003: Set the
AMPLI-
TUDE
B/PHASE switch to
PHASE so
that amplitude
and
phase
can be
observed
simultaneously.
Disregard any further
ref-
erences to the DISPLAY switch
in the
following steps.
d. Set the
Frequency Synthesizer
amplitude to
+
25.05 dBm
(2
V rms
at
outputs ofPower Splitter)
and
frequency to I Hz wirh Leveling switch
to
OFF'.
e. Set the
Variable
Attenuator to 0
dB.
f.
Allow tine
for
the 3575A reading to stabilize.
g.
The channel
B amplitude reading
(B
dBV) should be
within the
tolerances
listed in Table
5-2 for the corre-
sponding input
frequency
and attenuator
setting.
h.
set the AMPLITUDE FUNCTION
switch to B/A and
allow
time
for
the reading to stabilize.
i. The ts/A reading should be
within
the tolerances
listed in Table 5-2 for the corresponding input
frequency
and attenuator
setting.
j.
Reset the AMPLITUDE FUNCTION switch to B. Set
the
DISPLAY
switch to
PHASE
and allow time
for
the
phase
reading
to
stabilize.
k.
The 35754
phase
reading should be 0 degees
I
tolerances listed in Table 5-2 for the coresponding input
frcquency and attenuator sotting.
I. RESCT thE DISPLAY SWitCh tO AMPLITUDE.
rn. Repeat Steps I through I for each input frequency
and attenuator
settin8
listed in Table
5-2.
For frecluencies
greater
than 10 Hz, the 33208 Leveling switch must be set
to ON.
Note
that the 3575A
Voltage
Rarge and
Frequercy
Range switches must be set as indicated in thc table. For
most of
the checks
listed in Table
5-2,
the Voltage Range
switches should be set to the 0.2 mV
-
2
V
position.
At
various
points
in the 1able, however, the 2 mV to 20 V
range is
specified.
The
reason for this is to spot check the
amplitude
readings on the high range. These
particular
54
Model 3575A
checks do not apply to
phase
since
phase
must be measured
on
the
lowcst applicable range.
NOTE
tlhefi
the
point
is
reached
where the input
frequenc!
is
I MHz and above, reverse the Channel A input contlection
so
that both
sigruls
ore
terminated
dt
the
35754 input
connectors.
n.
Again
reyerse the Channel A input connection so the
termination is at the
output of the Power
Splitter
as shown
in Figure
5-2.
Connect
the terminated
output ftom
the
Power Splitter to Channel
B
and the terminated
output
from
the
Variable Attenuator to Channel A.
o.
Set
the 3575A controls as
follows:
DISPLAY
....AMPLITUDE
AMPLITUDEFUNCTION..........
A
Voltage
Range . 0.2
mV
-
2
V
(both
channels)
FREQUENCY
RANGE . . . .! Hz
-
l
kHz
PHASE REFERENCE .,.. .. ,. ., .,.
A
p.
Set the Frequency Synthesizer
amplitude to
+
25.05 dBm,
frequency to
I Hz and Leveling to OFF.
q.
Set the
Variable
Attenuator
to 0
dB.
r.
Allow
time
for
the 3575A
reading to
stabilize.
s. The channel A amplitude
reading
(A
dBV) should be
within
the tolerances
listed in Table 5-2
for
the coues-
ponding
input
frequency
and attenuator setting.
t. Set the
AMPLITUDE FUNCTTON switch
to B/A and
allow time
for
the reading to
stabilize.
u.
The
B/A reading should be
within
the tolerances
listed in Table
5-2 for
the corresponding
irput
frequency
and
attenuator setting.
v. Reset the AMPLITUDE
FUNCTION switch to A and
PHASE
REFERENCE
to
-
A. Set
the DISPLAY switch to
PHASE
and
allow time for the
phase
reading to stabilize.
w. The 3575A
phase
reading
should
be
-
180 degrees or
+180
degrees
1
tolerances listed in Table
5-2 for
the
coffesponding input frequency
and attenuator setting.
X,
RESCT thc DISPLAY
SWitCh tO AMPLITUDE.
y.
Repeat Steps r through x for each input frequency
and attcnuator setting listed in Table 5-2. For frecluencies
greater
than 10
Hz,
the
33208
Leveling switch must be set
to ON. Use the Voltage Range and Frequency Range
settings
indicated in the table.
NOTE
llhen the
point
is reached where the input
ftequency
is
I MHz and above, reverse the Channel B input connection
so
that both signals are terminated at the 3575A input
connectots.
PEBFOBMANCE CHECKS