Model8555A
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G)
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Plus
"+"
lights when logarithmic amplification
(11)
is selected; times
"x"
lights
when
linear
amplification (11)
is
selected.
With
"+"
lighted,
LOG
REF line
is
sum (black numerals)
of
LOG
REF LEVEL controls). With
"x"
lighted, per
division absolute voltage amplitude
is
product
of
blue numeral LINEAR SENSITIVITY control
settings .
Provides a 30-MHz signal at -30
dBm
for amplitude
calibration
of
spectrum analyzer.
Indicates 1
dB
increments for logarithmic ampli-
fication; indicates multiplication factors
up
to
unity for linear amplification.
Provides pen lift operation to
HP
7005, 7035,
7004, 7034
and
all
new
TTL compatible
HP
recorders. Provides input for external blanking
sig-
nal (-1.5V) for external scan mode operation. Pro-
vides input for external positive or negative trigger
pulses
(2-20V), normally negative, polarity selected
by internal switch
in
IF Section) for external scan
trigger operation.
Detected video
output
proportional to vertical
deflection on CRT.
For receiving an external scan ramp or
output
coupling for the internally-generated scan ramp.
Input or
output
function determined by !NT/EXT
positions of
SCAN
MODE switch.
Adjusts vertical position and
gain
of trace.
Adjusts horizontal position and
gain
of
trace.
Selects scan trigger mode.
Selects 10
dB
logarithmic
or
linear display mode
in
8552A plus another 2
dB
log position
in
8552B.
The dB graduation (black numerals), opposite the
lighted index lamp, indicate the power
level
at
the
LOG
REF graticule line on CRT when LOG/
LINEAR (11)
is
set to LOG.
With
LOG/LINEAR
set
to
LINEAR, the voltage graduations (blue
numerals), opposite the lighted index lamp, indi-
cate the per division multiplier for calibrated
voltage amplitude.
Selects scan ramp mode. Ramp
is
internally
generated for
SINGLE/IN'!' positions
but
it must
be externally supplied for EXT position. (Refer
to
Item 7). Model 8552B has
an
added manual scan
mode position. (Refer to Item 34.)
Controls
SCAN
TIME
PER DIVISION.
Press
to initiate scan with
SCAN
MODE
switch set
to
SINGLE. Press during scan to stop and reset
scan.
Selects 100 Hz,
10
kHz or OFF position
of
lowPass filter for detected video
in
8552A plus an
added
10 Hz
in
8552B.
Lights for duration of each scan for single and
internal scan modes.
Operation
4T)
Blanks lower part of trace
to
prevent over·
exposure of photographs due to high intensity of
baseline. Blanking function also prevents blooming
with a variable-persistence storage display section.
Provides
1-
and 10-volt, peak-to-peak, 60
Hz
squarewave outputs. '
These calibrated outputs should never be
used with the spectrum analyzer. (These
outputs are for
use
only with the 1400-
series oscilloscope plug-ins.)
Excessive brightness for a static
or
very
slow-moving trace may burn the
phosphor and permanently damage the
CRT. This caution
is
applicable
to
both
the fixed and variable-persistence/storage
CRT; however, the latter
is
especially
vulnerable
to
operational errors
of
this
type .
Makes base line parallel with the horizontal
grati-
cule line.
Focuses CRT beam .
Used
with FOCUS control (22)
to
obtain smallest
spot with maximum roundness.
Lights when line voltage
is
applied and instrument
is
turned on .
Switches line voltage
to
instrument.
When
used with 1400-series oscilloscope plug-ins,
intensifies and returns beam to CRT, regardless of
deflection potentials. Produces no effect on
analy-
zer displays.
G Display CRT with graticule lines.
e Selects
non-stora§If.~~]
Use
storage function when possible
to
prevent damage
to
the CRT.
6)
Press to ERASE when
in
S'l'D or F AS'!' writing
speed.
I)
Selects writing speed.
0 Varies time the trace
is
visible.
t)
Selects storage time.
G Press to store signal display. Storage time (relative
display
brightne&s)
in
storage mode
is
adjusted
by
(32).
C) Manual scan control positions the electron beam
on CRT when using
MAN
SCAN mode.
Figure 3-2. Typical Display and
IF
Section
Controls, Connectors and Indicators (
cont'd)
3-7
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