Section V
PERFORMANCE
TESTS
Model
3580A
Step e and f· 1000.48 kHz to 1000.52 kHz
Step e and f· 1000.98 kHz to 1001.02 kHz
Step e and f· 1001.48 kHz
to
1001.52 kHz
e. With the FREQUENCY control pulled
out
for fine
tuning, tune the 3580A frequency for a Counter reading
between 1000.58 kHz and 1000.62 kHz.
f.
Press CLEAR WRITE, then slowly turn the
MANUAL VERNIER
to
obtain a peak reading. The peak
should be more than 70 dB below full scale (- 140 dBV).
g.
Repeat Steps e and f substituting 1001.18 kHz to
1001.22 kHz, and 1001.78 kHz
to
1001.82 kHz for the
Counter readings.
DISPLAY SMOOTHING
...........
MIN
FREQ.SPAN/DIV
................
20
Hz
NOTE
If
the instrument fails this test double check
that the input short
is
as
small
as
possible; that
all
power line
cu"ent
is
kept at a minimum,
and that all covers
are
tightly secured on the
3580A.
5-36.
IF
Feedthru
and
Zero
Beat
Response
Tests.
5-3
7. These tests verify
the
ability
of
the instrument
to
reject a
100
kHz signal
at
the
input and also
how
well
the
Zero Beat Response
is
suppressed. Proceed to the Mixer
Balance Adjustments (Paragraph 5-81)
of
the Adjustment
Procedures
if
the
Zero Beat Response
is
too
large. Proceed
to
Section VII for troubleshooting information
if
there is
too
much
IF
Feedthru.
Equipment Required:
Frequency Synthesizer (-hp- Model 3320B,
50
ohm)
a. Reconnect
the
synthesizer
to
the 3580A. Do
not
terminate. Adjust
the
source for a 10 volt 100 kHz
output
(+
26.99 dBm
50
ohms setting on 3320B and untermina-
ted).
b.
Position the following front panel controls: (Only
those controls printed in BOLD require a change from the
previous test).
ADAPTIVE SWEEP
.................
OFF
DISPLAY . . . . . . . .
All
pushbuttons released
AMPLITUDE MODE
......
LOG 10 dBv/DIV
AMPLITUDE
REF
LEVEL
.......
NORMAL
dBv/LIN - dBm
600
n
............
dBv/LIN
INPUT SENSITIVITY
.............
+
20
dB
VERNIER (Amplitude) . . . . . . . . . . . CAL
(Fully
CW)
FREQUENCY
.................
00.0 kHz
START-CTR
...................
START
RESOLUTION BANDWIDTH . . . . . . . . 3 Hz
DISPLAY SMOOTHING
...........
MIN
5-12
FREQ. SPAN/DIV . . . . . . . . . . . . . . . .
20
Hz
SWEEP TIME/DIV . . . . . . . . . . . . . . . 5 SEC
SWEEP MODE
.................
MANUAL
Option
002:
Set
dBm
900
Q/LIN
-
dllm
600
n switch
to
dBm
900
n;
set INPUT
MODE switch
to
UNBAL.
c. Adjust MANUAL VERNIER for a response in the
center
of
the screen. The display indication should be at
least
70
dB below full scale
to
verify the IF Feedthru
specification
of
Table 1-1.
If
the instrument fails this test,
see Section VII for troubleshooting information.
d. Disconnect the synthesizer. Reposition the following
front panel controls:
RESOLUTION BANDWIDTH . . . . . .
300
Hz
FREQ. SPAN/DIV
................
5
KHz
SWEEP MODE
...................
RESET
e. Momentarily press the following front panel control:
DISPLAY
...............
CLEAR WRITE
f.
Adjust ZERO CAL for a maximum display indication
on the left graticule. This display should be
at
least
30
dB
(3 major divisions) below full scale
to
verify the Zero Beat
Response specification
of
Table 1-1.
If
the instrument fails
this test, go to
the
Mixer Balance Adjustments (Paragraph
5-81)
of
the Adjustment Procedures.
5-38.
Input
Impedance
Tests.
5-~.
These tests verify
the
Input Impedance characteris-
tics
of
Table 1-2. Since there
is
no
adjustment for this
parameter,
see
Section VII for troubleshootinginfcmnation
if
the instrument fails this test.
Equipment required:
1
Mn
± 1 % film resistor (-hp- Part No. 0757-0344)
a. Position
the
following front panel controls. (Only
those controls printed
in
BOLD require a change from
the
previous tests.)
ADAPTIVE SWEEP
.................
OFF
DISPLAY
........
All
pushbuttons released
AMPLITUDE MODE
......
LOG 10 dBv/DIV
AMPLITUDE REF LEVEL
.......
NORMAL
dBv/LIN - dBm
600
n
............
dBv/LIN
INPUT SENSITIVITY
..
.
..
.
..
..
.
..
. 0 dB
VERNIER (Amplitude . . . . . . . . . . . . CAL
(Fully
CW)
FREQUENCY
.................
00.0 kHz
START-CTR
...................
START
DISPLAY SMOOTHING
.............
MIN
RESOLUTION BANDWIDIB . . . . . . . 10 Hz
FREQ. SPAN/DIV
................
1 KHz
SWEEP TIME/DIV . . . . . . . . . . . . . . . 5 SEC
SWEEP
MODE
...................
RESET
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