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M
Section
V
Model 654A
TEST
OSCILLATOR
hp654A
MULTI-FUNCTION METER
hp 3450B
SE
E
TE
x
T
FOR
OJAl
UES
OF RI ANO R2
ADAPTER
ADAPTER
hp
10110A
hp
101i0A
Figure 5-2. Amplitude Accuracy Checks - BAL
5-13_ 150 BA L AMPLITUDE
ACCURACY.
d. Add the two
voltages:
the total
voltage should
fall
between
2424V
rms
and 2.474V
fins verifying an
a.
Connect the
equipment
as in Paragraph 5-12a
absolute
accuracy
of+IOdBm
+/-1%.
except
use
75 ohm
resistors in place of the 67.5
e.
If the tolerances are not met troubleshoot the
ohms
.
instrument: the
most
likely
problem would
be
the
600
ohm
impedance
network on
the A4 Board.
b.
Set the
654A controls
as in Paragraph
5-IOb
exccpt set
IMPEDANCE to
ISO
BAL.
5-15. LEVEL FLATNESS CHECKS.
c.
Perform
steps c and
d
of
Paragraph 5-12.
5-16. 50 UNBAL FLATNESS CHECK.
d.
Add
the
two
voltages;
the total
voltage should
faIJ
between
1.213V
rms and
J
.237V rms
verifying
an
absolute
level
of
+
I
OdBm
,
+/-1
%.
3.
Set the
654A controls
as follows
:
e. If the tolerances
are
not met troubleshoot the
FREQUENCY dial
.1
instrument
:
the most likely problem would be the
FREQUENCY RANGE
.. XIK
150
ohm
impedance
network on the A4
Board.
OUTPUT LEVEL dBm
.. .
...
..
.
+10 ,0
5-14. 600 BAL AMPLITUDE ACCURACY.
IMPEDANCE
.
AMPLITUDE.
.
..
..
50 UNBAL
Adjust for OdBm
a.
Connect the
equ.ipment
as in Paragraph 5-12a
on 654A meter.
except
use 300
ohm
resistors in place
of
the
67.5
oh
ms.
b. Connect the
equipment shown
in Figure 5-3
:
use
the
50
ohm thermal
converter
(Table 5-3) which
b. Set the
654A controls
as
in Paragraph 5-IOb
should
be connected directly to the
654A
UNBAL
except
set
IMPEDANCE
to
600 BAL
output
connector.
(The
parts required to
build the
c. Perform
steps c
and d
of
Paragraph 5-]2.
Reference Supply
are
shown in Figure
54).
DC NULL
VOLTMETER
TEST
OSCILLATOR
np
419A
np654A
~
......
,
~
~ ~~l,
___
~li~il
r - - - - - - - '
.
:
REFERENCE
:
- - - - - - - - : - < , 0
SUPPLY
I
°
SEE
I
THERMAL CONVERTER
:
FIGURE 5
-
4
:
SEE
TABLE
5-3
L
_________
-.l
Figure 5-3. Level Flatness Checks
54
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