HP 3580A Service Manual

Model 3580A
PERFORMANCE TESTS
Section V
Option 002: Set dBm 900 .Q/LIN - dBm
600 .Q switch to dBm 900 .Q; set INPUT
MODE switch to UNBAL.
b. Adjust ZERO CAL for a peak display on the left
graticule.
c. Reposition the following front panel controls:
AMPLITUDE MODE ........ LOG 1 dB/DIV
SWEEP MODE ................. MANUAL
d. Connect the rear panel TRACKING OSC OUT to the
front INPUT terminals of the 3580A. Adjust the rear panel
TRACKING OSC LEVEL control fully CW. Adjust
MANUAL VERNIER for a l kHz display indication (l
major division from left graticule). Readjust the TRACK-
ING OSC LEVEL control for a full scale 0 dB display.
Momentarily press the following control:
DISPLAY ............... CLEAR WRITE
e. Connect the 1 M.Q resistor in series between the
TRACKING OSC OUT and front panel INPUT terminals.
The display indication should drop 6 dB ± .3 dB (6 major
divisions ± .3 major divisions) to verify an input impedance
of I MD.
f. Reposition the following front panel control:
INPUT SENSITIVITY . . . . . . . . . . . . - 10 dB
g. Readjust the rear panel TRACKING OSC LEVEL
control for a full scale display. Adjust MANUAL VERNIER
for a display indication at 10 kHz (far right display
graticule). DO NOT REMOVE 1 MD RESISTOR. Momen-
tarily press the following front panel control:
DISPLAY ............... CLEAR WRITE
h. 1) Std. 3580A: The amplitude should drop 3 dB
± 1 dB, verifying that the input shunt capacitance
is 30 pF, nominal.
2) Option 002: The amplitude should drop 4 dB
± 1 dB, verifying that the input shunt capacitance
is 40 pF, nominal.
i. Disconnect the cable connected between the TRACK-
ING OSC OUT and the front panel INPUT terminals.
5-40. Output Tests.
5-41. These tests verify the Output specifications of the
3580A listed in Table 1-1.
Equipment Required:
Electronic Counter (-hp- Model 5326A)
Digital Multimeter (-hp- Model 34740/34702)
Distortion Analyzer (-hp- Model 333A)
5-42. TRACKING OSC OUTPUT 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 ...... LOG IO dBv/DIV
AMPLITUDE REF LEVEL ....... NORMAL
dBv/LIN - dBm 600 .Q ............ dBv/LIN
INPUT SENSITIVITY ............ + 20 dB
VERNIER (Amplitude) . . . . . . . . . . . CAL
(Fully CW)
FREQUENCY ................. 00.0 kHz
START- CTR ................... START
RESOLUTION BANDWIDTH ....... 10 Hz
DISPLAY SMOOTHING ............. MIN
FREQ. SPAN/DIV ................ 5 KHz
SWEEP TIME/DIV . . . . . . . . . . . . . . . 5 SEC
SWEEP MODE ................... RESET
Option 002: Set dBm 900 .Q/LIN - dBm
600 Q switch to dBm 900 n; set INPUT
MODE switch to UNBAL.
b. Momentarily press DISPLAY - CLEAR WRITE. Ad-
just the ZERO CAL for a peak display (on leftmost display
graticule).
c. Connect the multimeter (AC mode 100 volt range) to
the rear panel TRACKING OSC OUT. Adjust the FRE-
QUENCY dial for 50 Hz (300 Hz for Option 002). Adjust
the rear panel TRACKING OSC LEVEL control for a 2.00
volt reading on the multimeter.*
d. Adjust the FREQUENCY control to 50.0 kHz
(20.0 kHz for Option 002 instruments). Verify that the
multimeter reads 2.00 volts ± .06 volts ( ± .1 volts for
Option 002 instruments).
e. Reposition the following front panel controls:
AMPLITUDE MODE ................ LIN
INPUT SENSITIVITY ............... 2 V
FREQUENCY .................. 00.0 Hz
RESOLUTION BANDWIDTH . . . . . . . 30 Hz
SWEEP MODE ................. MANUAL
f. Connect the rear panel TRACKING OSC OUT to the
front panel INPUT terminals. Momentarily press the follow-
ing control:
DISPLAY ............... CLEAR WRITE
*For measurements below 50 Hz, use a low frequency Digital Voltmeter such as the -hp- Model 3480/3484 with true rms.
5-13

HP 3580A Specifications

General

Brand	HP
Model	3580A
Category	Measuring Instruments
Language	English