Amplitude Tests - HP 3580A Operating And Service Manual

Section V PERFORMANCE TESTS Model 3580A
j. Continue this procedure for the remammg FREQ.
SPAN/DIV settings. Refer to Table 5-2 for the proper
tolerances.
Table 5-2. Frequency Span Test.
COUNTER READING
FREQ. SPAN/DIV MANUAL VERNIER MANUAL VERNIER
FULLCCW FULL CW
5
Hz 1000.00 kHz 1000 .50 kHz ± .01 kHz
10 Hz 1000.00 kHz 1001.00 kHz ± .02 kHz
20 Hz 1000.00 kHz 1002 .00 kHz ± .04 kHz
50
Hz
1000.00 kHz 1005.00 kHz ±
.10 kHz
.1 kHz 1000.00 kHz
1010.00 kHz ± .20 kHz
.2 kHz 1000.00 kHz 1020.00 kHz ± .40 kHz
.5 kHz 1000.00 kHz 1050.00 kHz ± 1.00 kHz
1 kHz 1000.00 kHz 1100.00 kHz± 2.00 kHz
2
kHz
1000.00 kHz 1200.00 kHz ± 4.00 kHz
5 kHz - - - - -
-----
(checked in
Para 5-16)
5-16. Log Sweep Test.
a. Reposition the controls as follows:
INPUT SENSITIVITY ............... CAL
RESOLUTION BANDWIDTH . . . . . . . 30 Hz
SWEEP MODE ............... LOG ZERO
b. Momentarily press DISPLAY - CLEAR WRITE.
c. Adjust the ZERO CAL control for a maximum
indication on the leftmost display graticule.
d. Reposition the controls as follows:
RESOLUTION BANDWIDTH . . . . . . 300 Hz
SWEEP MODE ..................... LOG
Allow time for three complete sweeps.
e. Verify that the 20 kHz harmonic of the internal CAL
signal falls on the proper graticule ( ± 1 minor division). If
the instrument will not pass this test, but passes all previous
tests, perform only the Log Sweep Adjustments (Paragraph
5-67) of the Adjustment Procedures.
5-17. Sweep Time Tests.
a. Reposition the controls as follows:
SWEEP TIME/DIV ............. 0.01 SEC
SWEEP MODE .................... SING
Momentarily press:
DISPLAY ............... CLEAR WRITE
b. The display should be erased, and then swept once.
Remembering the sweep time, reposition the controls as
follows:
SWEEP TIME/DIV ............. 0.02 SEC
5-4
c. Again, press:
DISPLAY ............... CLEAR WRITE
The sweep time should appear slower.
d. Repeat this procedure for all sweep times, always
looking for progressively slower sweep rates. On the slowest
sweep rates, it will not be necessary to complete a full
sweep before switching to the next SWEEP TIME/DIV. Let
the instrument sweep only as long as is necessary to
monitor the rate. A more accurate method for measuring
sweep time is given in Paragraph 7-39.
5-18. Amplitude Tests.
5-19. These tests verify the Amplitude Specifications given
in Table 1-1. Amplitude accuracy must be determined
before the Bandwidth Specifications can be tested. Since
the IF Filter Alignment (Paragraph 5-70) interacts with the
Amplitude Accuracy, it is important that the IF Filter
Alignment be performed first if the instrument will not pass
any of the Amplitude Accuracy Tests. The Amplitude Tests
should then be repeated, and if the instrument still fails
these tests, then perform the Amplitude Adjustments
(Paragraph 5-74) of the Adjustment Procedures.
NOTE
There are no adjustments for Amplitude Refer-
ence Level Tests (Linear and Log Mode). If the
instrument passes all Amplitude Tests except
one or both of these, refer to Section VII for
troubleshooting information.
Equipment Required:
Frequency Synthesizer (-hp- Model 3320B, 50 ohms)
50 Ohm Termination (-hp- 11048C)
Digital Multimeter (-hp- Model 34740/34702)
5-20. Bandwidth Switching Accuracy Tests.
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 ...... . WG 1 dBv/DIV
AMPLITUDE REF LEVEL ....... NORMAL
dBv/LIN - dBm 600
n ............
dBv/LIN
INPUT SENSITIVITY . . . . . . . . . . . . . 0 dBV
VERNIER (Amplitude) ............ CAL
(Fully CW)
FREQUENCY ................. 10.0 kHz
ST ART - CTR ..................... CTR
RESOLUTION BANDWIDTH . . . . . . 300 Hz
DISPLAY SMOOTHING ........... MIN
FREQUENCY SPAN/DIV ........... 5 Hz
SWEEP TIME/DIV . . . . . . . . . . . . . 0.1 SEC
SWEEP MODE ................. MANUAL