Scans by ArtekMedia © 2007
(to display "SHIFT"), then press the
PEN SELECT
push button that corre
sponds to the current pen. The pen holder will put the pen away. The pen
holder also returns the current pen to the carousel when the paper loading
lever is raised for removing paper.
The Pen Cursor Controls
The pen cursor controls are used to manually position the current pen
within the writing area of the paper. Pressing a cursor control moves the
pen
in
the direction of the control arrow; pressing adjacent controls moves
the pen at a 45-degree diagonal between the two arrow directions. When the
central
FAST
pushbutton is pressed in conjunction with any cursor con
trol(s), the pen-positioning speed is increased.
The Pen Up and Pen Down Pushbuttons
The pen may be raised or lowered. by pressing the
PEN UP
or
PEN
ON
push
buttons, respectively. These push buttons can be used to raise or lower pens
during plotting, mark reference points on the medium and, when used in
conjunction with the pen cursor controls, draw lines or accentuate the
X-
or
Y-axes of grids.
Mter performing any front-panel function, the pen is automatically raised
to prevent the bleeding of ink onto paper. In addition, if
PEN
ON
is pressed to
latch the pen in the "down" position and the pen is allowed. to remain
motionless for approximately 65 seconds, the HP
7090
will raise the pen.
Setting the Real-Time Clock
The internal, real-time clock used to time recording functions and annotate
time labels is preset at the factory using Pacific Standard Time. Because
the clock is battery powered, it will maintain correct time even when the
HP
7090
is turned off. However, time-zone changes may necessitatechang
ing the clock settings.
To set the real-time clock:
1.
While holding down the
SHIFT
push button, use the .. setup condition
selector to select the
TIME AND DATE
selection. (The
TIME AND DATE
indicator
will remain lit while the clock-setting function is in effect. The function
is exited whenever the .. selector is pressed.)
The LeD will display a two-digit number representing the current year
selection, along with the word "YEAR."
2. If you need to change the year selection, turn the control wheel until the
desired value is displayed. The selected value is automatically entered.
3.
Press the .. setup condition selector to display the current month selec
tion, along with the word "MONTH." Use the control wheel if you need
to change the month selection.
4. Press the .. selector to display and select values for the day ("DAY" is
displayed), then hours (24-hour notation is used and "HOURS" is
displayed).
5. Press the .
.
selector to display the current minute selection and
"M
h
IN
1
U
t
T
h
ES·"
1
Wh
d
en
�
new mi
l
nu
�
value
ed
is
the co
d
n
�
l
•
w ee , e se ecte mmute va ue
15
enter , t e va ue
secon s
IS
2·18 Instrument Description and General Operation