HP 7044B Operating And Service Manual page 16

Section III
Model 7044B/7045B
1. VOLTAGE SELECTOR SWITCHES: These two switches are positioned to correspond with the AC line input
voltage. Any voltage of 100,120, 220, or 240 volts AC.
2. POWER CORD RECEPTACLE: Use the power cord provided with the recorder.
3. FUSE HOLDER: For line fuse:
7045B: 100 or 120 volts 1.5 AT (P/N 2110-0304)
220 or 240 volts 750 mAT (P/N 2110-0360)
7044B: 100 or 120 volts 1 AT (P/N 2110-0007)
220 or 240 volts 500 mAT (P/N 2110-0202)
4. REAR CONNECTOR: A 37-pin connector for the input of all signals except power. A mating connector is
supplied in the accessory kit.
5. PEN LIFT (TTL): Banana jack connector for remote control of the pen lift and 100 millisecond servo delay.
7G44-A-9-2 . ' ' ----*-----
Figure 3-3. Rear Panel
3-23. ENERGIZE RECORDER.
3-24. Place the LINE toggle switch to the ON position.
This will furnish power to the recorder.
3-25. INSTALL PAPER.
3-26. Place chart paper on the recording platen and align
the left edge with the paper stop. To energize the platen,
place CHART toggle switch to HOLD.
3-27. INSTALL PEN.
3-28. The disposable pen is pushed into the notched
holder located on the scale, and twisted clockwise to lock
in holder.
![ CAUTION
The disposable pen incorporates a preci¬
sion writing tip. Care must be taken not
to damage this tip during pen changing
or other handling. Writing by hand on
any surface may damage pen tip. Use
pen in pen holder on recorder.
3-29. SET VERNIER CONTROL.
3-30. Vernier control enables operator to adjust recorder
sensitivity to any value between fixed ranges. It is often
used to adjust the recorder sensitivity to align with actual
function to be measured — not necessarily voltage (i.e. 100
lbs/in*, 20 dB/in.).
3-31. CONNECT INPUTS.
3-32. Connect the signal inputs to each axis through the
front input terminals using open wires or banana connectors.
3-33. ZERO SET.
3-34. Connect the input signals to the recorder and adjust
the zero position so that the resulting graph will cover the
desired area on the paper.
3-35. LOWER PEN.
3-3'6. Lowering the pen for recording purposes is accom¬
plished by positioning the PEN toggle switch to RECORD.
When TTL is installed, pen lowering is energized by level
changes to less than +0.4 Vdc. Changing level to between
+2.4 and +5.5 volts will raise the pen.
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