HP 3580A - Page 18

Model 3580A
GENERAL OPERATING INFORMATION
Section III
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LINEAR Button: (push to set; push LOG 1 dB or LOG 10 dB
to release) Selects Linear amplitude mode for absolute mea-
surements in rms volts or relative measurements in percent of
full scale. (Paragraph 3-51)
POWER Switch: Applies line voltage to i nstrument when set
to ON (AC) position; applies battery power to Option 001
instruments when set to ON (BAT) position; applies line
voltage to Option 001 instruments to recharge batteries when
set to CHARGE position. (Paragraph 3-192)
@ POWER Light: Lights when POWER switch is set to ON (AC),
ON (BAT) or CHARGE.
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STORE Button: (push to set; push to release) When initially
pressed, t race currently being displayed is permanently stored
in memory. When released, permanently stored trace is cleared
from memory. (Paragraph 3-160)
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BLANK STORE Button: (push to set; push to release) When
pressed, permanently stored trace is blanked from the display.
When released, stored trace returns to display . (Paragraph
3-160)
CLEAR WRITE Button: (momentary pushbutton) Clears dis -
play and resets sweep.
FOCUS Control: Focuses CRT trace. (Paragraph 3-158)
ADAPTIVE SWEEP Control: Turns Adaptive Sweep on or off;
is used to set baseline threshold on CRT display. (Paragraph
3-147)
INTENSITY Control: Adjusts brightness of CRT trace. Inten -
sity can be set to any level without danger of burning the CRT
face. (Paragraph 3-158)
Figure 3-1_ Front Panel (Cont'd).
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TRACKING OSC
OU T
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X-AXIS Output : Female BNC connector supplies de voltage
correspon ding to position of frequency sweep on CRT. Output
voltage ranges from O V (left-hand edge) to + 5 V (right -han d
edge). Output resistance is 1 kilohm, nominal . (Paragraph
3-165)
Y-AXIS Output: Female BNC connec tor supplies de voltage
proportional to amplitude. Output voltage ranges from 0 V
(bottom of screen) to + 5 V (top of screen). Output resistance
is 1 kilohm, nominal. (Paragraph 3-168)
PEN LI FT Output: A contact closure is present across these
terminals during single sweeps. If Adaptive Sweep is used, the
closure is present only when the instrument is sweeping slowly
o ver a response. (Paragraph 3-1 70)
Power Input Module : Accepts p ower cord supplied with
instrument. Contains line fuse and PC board for selecting line
voltage. (Paragraph 3-193)
EXT TRIG IN Connector: Female BNC connector accepts
contact closure or TTL logic levels to remotely trigger the
frequency sweep. (Paragraph 3-143)
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LO. OUTPUT: Female BNC connector supplies a 100 mV rms
signal whose frequency varies from 1 MHz to 1.5 MHz as the
analyzer frequency is tui;ied from O Hz to 50 kHz. Output
impedance is approximately 1 ki lohm. (Paragraph 3-178)
EXT REF/NORMAL Switch: In the NORMAL position, the
tracking oscillator receives its reference from an internal
100 kHz crystal oscillator. In the EXT REF position, the
tracking oscillator reference is an external signal applied to the
TRACKING OSC IN connector. With the switch in the EXT
REF position, the tracking oscillator will be inoperative unless
an external reference signal is applied. (Paragraph 3-176)
LEVEL Control: Sets the amplitude of the Tracking Oscillator
Output signal (0 V to 2 V rms).
TRACKING OSC IN: Female BNC connector . An external
reference signal can be applied to this connector to offset or
frequency-modulate the Tracking Oscillator Output signal.
(Paragraph 3-1 75)
TRACKING OSC OUT : Female BNC connector supplies O Hz
to 50 kHz signal that tracks the tuned or swept frequency of
the instrument. Output level can be adjusted from O V to 2 V
rms using the rear panel LEVEL control. Output impedance is
600 ohms, nominal. (Paragraph 3-171)
Figure 3-2. Rear Panel.
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