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Model 7044B/7045B
Section III
SECTION III
OPERATING INSTRUCTIONS
3-1.
OPERATING REQUIREMENTS.
3-2.
INTRODUCTION.
3-3.
The basic function of the Models 7044B and 7045B
X-Y Recorders is to produce a cartesian coordinate graph
showing the relationship between two variable functions.
Slowly varying dc signals representing these functions are
applied to the input terminals of the respective X and Y
axis of the recorder and its controls adjusted so that, the
res'ilting graph will cover the desired region of the graph.
!; CAUTION
Before attempting to operate the recorder,
the user should become familiar with the
input requirements and various control
functions as outlined in the following
paragraphs.
34.
CONTROLS, CONNECTORS, AND INDICATORS.
3-5.
The front and rear panel controls, connectors and
indicators are depicted and explained in Figures 3-1 and
3-3. The 37-pin rear connector is depicted in Figure 34.
3-6.
ELECTRICAL REQUIREMENTS.
3-7.
OPERATING POWER.
3-8.
The ac power supplied to the models should be
either 100, 120, 220 or 240 Vac, 48 to 440 Hz, single
phase. Two voltage selector switches located on the under¬
side of the recorder on the connector panel must be set to
correspond to the available supply voltage. A 1.5-ampere
time delay fuse is used for 100 or 120V operation and a
3/4-ampere time delay for 220 or 240V.
3-9.
Power plugs used in the United States and other
countries are shown in Figure 3-2. The plug ra
ting
and the
HP Part Number for the plug and power cord are shown be¬
side each plug. If the correct power cable is not available,
notify the nearest Hewlett-Packard Sales and Service Office
and a replacement cable will be provided.
3-10.
INPUT SIGNALS.
3-11.
The recorder's input terminals (HI and LO), located
on the front panel, must be supplied with varying dc signals.
These signals should vary at a rate within the response capa¬
bilities of the recorder and have amplitudes within their
scale ranges ox an erroneous recording may result. It is pos¬
sible to have an excessive amount of ac noise present in the
input signals, thereby resulting in recorder response becom¬
ing oscillatory and inaccurate. It is important that the side
of the signal with the lowest impedance to ground side is
connected to the LO input terminal of the recorder. If this
results in the recorder axis moving in the wrong direction,
reset POLARITY switch to +RT or -RT for X-axis or to
+UP or -UP for the Y-axis. If excessive normal mode noise
is present on the input signals, an external filter(s) may be
necessary.
3-12.
GROUNDING.
3-13.
For optimum performance, the center prong of the
ac power cord must be grounded. When operating from un¬
grounded power sources, a secondary grounding method is
mandatory.
3-14.
OPERATING PRECAUTIONS.
3-15.
SERVO.
3-16.
To avoid unnecessary wear on the balance potentio¬
meters and other mechanical parts, place the SERVO toggle
switch in STANDBY when not recording.
3-17.
If the input voltage exceeds the range setting, the
pen will move quickly to one end of its travel and strike
the drive mechanism stop. The motor will stop, protecting
the recorder against damage
until
the input signal returns
to an onscale value.
3-18.
RESPONSE SWITCH.
3-19.
On the 7045B, position RESPONSE toggle switch
in SLOW position. This permits making prerecording span
and zero adjustments without the pen and arm driving
against the stops at full slewing speed. This position also
enables the user to record slow input signals or reduce the
speed of the recorder.
3-20.
OPERATING INSTRUCTIONS.
3-2L
CONNECT POWER.
3-22.
Set the power voltage selector switch, located on
the underside of the recorder, to either 100,120,220, or
240V +5-10% depending on the available power source.
Connect the power cord between the power receptacle
and the power source.
3-1
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