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5
Section V
Model
654A
5-18. 135 SAL FLATNESS CHECK.
5-21
.
METER TRACKING ACCURACY CHECK,
a.
Perform the procedure of Paragraph 5-16
steps a
through
g with
the following
changes:
In
step a. Set
[MPEDANCE to 135 BAL;
In
step
b.
Use the 135
ohm
thermal
converter
(Table
5-3)
which should
be connected
directly
to both
output connectors of
the
654A;
In
step
r
Sweep
the 654A
over
the frequency
range
of
10Hz to 5MHz.
b.
If the tolerances are not met, first
assure
that the
75
UNBAL
flatness
is within tolerance before
troubleshooting the 654A.
5-19. 150 SAL FLATNESS CHECK.
a.
Perform the
procedure of
Paragraph
5-16 steps a
through
g
with the following changes:
In
step
a.
Set IMPEDANCE to 150 BAL;
In
step
b.
Use
the 150
ohm
thermal
converter
Crable
5-3) which
should
be connected
directly
to both output
connectors of
the 654A;
In
step
f. Sweep the 654A
over
the frequency
range
of
10Hz to 5 MHz.
b.
If the tolerances are not met, first
assure
that the
75
UNBAL natness is
within
tolerance before
troubleshooting
the 654A.
5-20. 600 BAL FLATNESS CHECK.
a.
Perform
the
procedure
of
Paragraph
5-16 steps a
through
g
with the following
changes:
In
step
a.
Set
IMPEDANCE to 600 BAL;
In
step
b.
Use the 600
ohm
thermal
converter
(Table
5-3) which
should
be
connected directly
to both output
connectors of
the 654A
.
In
step
f. Sweep the 654A
over
the frequency
rangeoflOHzto
IMHz.
b. If the tolerances are not met, first assure that the
75
UNBAL
flatness
is
within
tolerance before
troubleshooting the
654A.
a.
Connect the
equipment
as
shown
in Figure
5-5.
Use
an attenuator
with
known
accuracy
at
10kHz,
;
and
JOMHz.
b.
Set
the 654A
controls
as follows:
FREQUENCY RANGE
...
.
...
.....
.
.
... Xl K
FREQUENCY dial
..............
.
.
.
......
10
OUTPUT LEVEL dBm
..
..........
. . .
+10,0
IMPEDANCE
...................
.
50
UNBAL
AMPLITUDE
.
. . . . .
.
... Adjust for
OdSm
on
654A
meter
c. On th
e
rear
panels
of
the instruments,
connect
the
312A Wave Analyzer RECORDER OUTPUT to
the
313A
Tracking
Oscillator
RECORDER
INPUT. Set the tracking
oscillator METER
MODE
switch
to
EXPAND
312A
.
d.
Set the external
attenuator
to
-ldB
position
.
e.
Adjust
the
wave analyzer
to the
same
frequency
as
the
654A and
for
a
meter indication
of
between
-7dB and
+3dB.
f.
Adjust the tracking
oscillator
SCALE
OFFSET
control
for
a
OdB reference
indication on
the
oscillator meter.
g.
Set
the
external attenuator
for
OdB
attenuation.
h. Adjust the
654A
AMPLITUDE
control
to return
the tracking
oscillator
meter
indication
to OdB
refere
nce;
654A
meter
should
indicate ·JdBm
,
+/-0.05dSm.
I
Set the
external attenuator
to ·2dB position.
j. Adjust the 654A AMPLITUDE
control
to
return
the tracking
oscillator
meter indication to OdB
reference; 654A meter
should
indicate +
I
dBm,
+/-0.0
5dBm.
TRACKING OSCILLATOR
hp313A
TEST OSCILLATOR
WAvE ANALYZER
hp654A
hp312A
lOB
/S
TEP
ATTENUATOR
hp355C
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Figure
5-5. Meter Tracking Accuracy Check
5-6
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