HP 7044B Service manual

045B
HP
7044B/
7045B

General Definitions of Safety Symbols Used On Equipment
rh ° b X
WARNING
International caution symbol (refer to manual): the product will be
marked with this symbol when it is necessary for the user to refer to
the instruction manual in order to protect against damage to the
instrument.
Indicates dangerous voltage (terminals fed from the interior by
voltage exceeding 1000 volts must be so marked).
Protective conductor terminal. For protection against electrical
shock in case of a fault. Used with field wiring terminals to indi¬
cate the terminal which must be connected to ground before
operating equipment.
Low-noise or noiseless, clean ground (earth) terminal. Used for a
signal common, as well as providing protection against electrical
shock in case of a fault. A terminal marked with this symbol must
be connected to ground in the manner described in the installation
(operating) manual, and before operating the equipment.
Frame or chassis terminal. A connection to the frame (chassis) of
the equipment which normally includes all exposed metal struc¬
tures.
Alternating current
Direct current
Alternating or direct current
The WARNING sign denotes a hazard. It calls attention to a pro¬
cedure, practice, or the like, which, if not correctly performed or
adhered to, could result in personal injury.
E
CAUTION
The CAUTION sign denotes a hazard. It calls attention to an op¬
erating procedure, practice, or the like, which if not correctly
performed or adhered to, could result in damage to or destruction
of part or all of the product.

HEWLETT
PACKARD
OPERATING AND SERVICE MANUAL
7044B/7045B
X-Y RECORDER
SERIAL NUMBERS
This manual applies directly to recorders with
serial numbers prefixed 2047A.
For additional important information about serial
numbers, see Recorders Covered by Manual in
Section I.
©Copyright HEWLETT-PACKARD 1980
16399 W. BERNARDO DRIVE, SAN DIEGO, CALIFORNIA92127
MANUAL PART NO. 07044-90006
Microfiche Part No. 07044-90056
Printed: NOVEMBER 1980

Model 7044B/7045B
Section I
SECTION I
INTRODUCTION
1.1 DESCRIPTION.
1-2. BASIC FRAME,
1*3. The Hewlett-Packard Models 7044B and 7045B X-Y
Recorders are designed for the laboratory user to plot
cartesian coordinate graphs from do electrical information.
The 7044B or 7045B will satisfy the needs of the user
seeking reliability and dependability. The 7045B recorder
features high speed capability and rapid acceleration to
accurately record high-frequency and fast-moving input
signals. It also offers a RESPONSE switch which allows
the user the choice of a fast or slow response. Both models
are equipped with the newly designed, continuous duty,
aluminum framed dc servo motor; the X-axis of the 7045B
contains the larger, faster motor. This design concept ends
overheating or wear if the pen is driven offscale for an in¬
definite time. Other features found on the 7044B and
7045B include 14 calibrated dc input ranges in each axis
from 0,5 mV/in. (0.25 mV/cm) to 10 V/in. (5 V/cm), TTL
Remote Control, and a Rear Connector. Arbitrary full
scale voltage ranges may be established with a variable input
vernier in conjunction with the calibrated dc ranges. A.
trouble-free electrostatic hold-down platen capable of hold¬
ing chart paper up to 11 x 17 inches and the standard
European A3 size, a disposable pen with four color choices,
and plastic coated wirewound balance potentiometer are
also provided on both models. Latest circuitry design and
assembly techniques have also been incorporated into both
models, thereby reducing failure and maintenance time.
Additionally, both recorders can be equipped with such
options as Time Base, Event Marker, or Metric Scaling.
See Figures 1-1 and 1*2 depicting the standard 7044B and
7045B models.
1-4. MODEL - MANUAL INFORMATION,
1-5. The contens of this manual apply to recorders with
the serial number prefix(e$) listed under SERIAL NUMBERS
on the title page. The serial prefix is the first four digits
and a letter of a two-part, ten-item serial number (0000A-
00000) used to identify each Hewlett-Packard instrument
(see Figure 1-3). Should any change to this manual be'nec¬
essary, a new serial prefix will be assigned to the changed
model and a change sheet (Manual Change) will be supplied
defining the differences between the changed model and
the one described within this manual. Other corrections
due to any errors that existed when this manual was printed
will be provided. This type of change, called Errata, also
appears on the change sheet (Manual Change). For addi¬
tional information pertaining to these recorders, or other
SERIAL
NUMBER PREFIX SERIAL NUMBER
7044-R-2-I
Figure 1-3. Instrument Identification
Hewlett-Packard instruments, contact the nearest Hewlett-
Packard Sales/Service Office.
1-6. SPECIFICATIONS.
1 -7. Table 1-1 lists the specifications and accessories sup¬
plied or available with the 7044B and 7045B models. Fig-
gure 14 illustrates the outside dimensions. Option specifi¬
cations are also defined in this section.
1-8. SAFETY SYMBOLS.
1-9. The following safety symbols are used with this Oper¬
ating and Service Manual.
The WARNING sign denotes a hazard.
It calls attention to a procedure, prac¬
tice, or the like, which, if not correctly
performed or adhered to, could result
in injury or loss of life. Do not proceed
beyond a WARNING sign until the in¬
dicated conditions are fully understood
and met.
The CAUTION sign denotes a hazard.
It calls attention to an operating pro¬
cedure, practice, or the like, which, if
not correctly performed or adhered to,
could result in damage to or desctruc¬
tion of part or all of the equipment.
Do not proceed beyond a CAUTION
sign until the indicated conditions are
fully understood and met.
1-1

Section I
Model 7044B/7045B
TABLE 1-1. SPECIFICATIONS
PERFORMANCE SPECIFICATIONS.
Input Ranges:
Type of Input:
Input Resistance:
Common Mode:
Rejection
Slewing Speed:
Acceleration:
0.5,1,2, 5, 10, 20, 50, 100, 200, 500 mV/in., 1,2,5,10 V/in. (metric capability available in
0.25,0.5,1, 2.5, 5,10, 25, 50, 100, 250, 500 mV/cm, 1,2.5 5 V/cm).
Continuous vernier between ranges.
Floating 30 Vdc or peak ac maximum. Polarity reversal switch located on front panel, guard
internally connected. Inputs through front panel 5-way binding posts or optional rear con¬
nector. Pen lift control is also available through rear-mounted banana jack connectors, or a
37-pin rear connector.
1 megohm constant on all ranges.
110 dB dc and 90 dB ac at 50 Hz and above with 1 K ohm between HI and LO terminals,
CMR voltage applied between ground and LO, and attenuator on most sensitive range. On
other ranges CMR decreases 20 dB per decade step in attenuation.
7044B
7045B
7044B
7045B
20 in/sec (50 cm/sec) minimum
(Fast Response) 30 in/sec (76 cm/sec) minimum;
(Slow Response) 15 in/sec (36 cm/sec) typical.
Y-axis, lOOOin/sec 2. (2540 cm/sec 2 . )
X-axis, 500 in/sec 2 . (1270 cm/sec 2 . )
(Fast Response) Y-axis 3000 in/sec 2 . (7620 cm/$ec 2 . )
X-axis 2000 in/sec 2 . (5080 cm/sec 2 . )
(Slow Response) Y-axis 2500 in/sec 2 . (6350 cm/sec 2 . )
X-axis 1500 in/sec 2 . (3800 cm/sec 2 . )
TYPICAL PERFORMANCE LIMITS
Frequency (Hz)
Accuracy:
Range Accurary:
±0.2% of full scale (includes linearity and deadband) at 25°C. Temperature Coefficient
±0.01% per °C.
±0.2% of full scale ±0.2% deflection (includes linearity and deadband) at 25°C. Temperature
Coefficient ±0.01% per °C.
Deadband:
0.1% of full scale.

Model 7044B/7045B
Section I
_ TABLE 1-1. SPECIFICATIONS (Continued) _
Overshoot: 7044B - 2% of full scale (maximum).
7045B - 1% of full scale (maximum).
Zero Offset: Zero may be placed anywhere on writing area or electrically off scale up to one full scale from
zero index.
Relative Humidity: 5% to 95% (below 40°C).
TTL REMOTE CONTROL.
Operating Levels: Contact closure (0.2 mA) to ground or TTL levels.
Logic (0): Between -0.5 Vdc and +0.4 Vdc.
Logic (1): Between +2.4 Vdc and 5.5 Vdc.
REAR CONNECTOR.
Connects Event Marker and TTL.
Provides X and Y inputs and pen lift TTL controls.
Supplies START and RESET remote capability.
TTL and Rear Connector provide Electrostatic Holddown and Servo Standby capability on Model 7044B. Additionally
X and Y Response on Model 7045B.
REMOTE PEN LIFT.
Banana Jacks provide remote control of pen lift.
GENERAL SPECIFICATIONS.
Writing Mechanism: Servo actuated ink pen.
Writing Area: . 10 in. x 15 in. (25 cm x 38 cm).
Paper Holddown: Electrostatic paper holddown grips charts 11 in. x 16.5 in. and standard European size A3
(29,7 cm x 42 cm) or smaller. Special paper not required.
Pen Lift: Electric (Remote, via contact closure or TTL level).
Power: 100,120, 220, or 240 volts ac +5 -10%, 48 to 440 Hz; 7044B, 135 VA; 7045B, 175 VA
Weight: 7044B: Net, 30 lb (13,7 kg); shipping 42 lb (19,1 kg).
7045B: Net, 30 lb (13,7 kg); shipping 44 lb (20 kg).
MO, OPTIONS.
1*11. Optional features available for the two models are
specified in Table 1-2. The following paragraphs describe
these features which may be built into or combined with
these recorders. Table 1-3 contains the specifications of
the options.
1-12. TIME BASE - OPTION 001.
1-13. Eight speeds from 0.5 sec/in. to 100 sec/in. are avail¬
able for both models in either the X or Y-axis. In the 7045B
model, however, with the addition of the RESPONSE
switch, the selection of the X or Y-axis time base sweep
speed automatically results in the SLOW response of that
selected axis; the other axis is not affected and operates
normally. (May be ordered only at time of recorder
purchase.) See Figure 1-5.
1-14. EVENT MARKER - ELECTRIC - OPTION 002.
1-15. A remotely controlled event marker, installed at the
top of the Y arm, identifies significant events in a recording
sequence by making an upward deflection in the margin at
the top of the chart paper. See Figure 1-6. The cartridge-
type pen is actuated by a remote contact closure. This
option may be field installed.
1-3

Section I Model 7G44B/7045B
1-16. METRIC SCALING - OPTION 006.
1-17, Metrically scaled and calibrated version of either
recorder is provided. (May be ordered only at time of
recorder purchase,)
1-18. ACCESSORIES.
1-19. Included in the standard Accessory Kit are a package
of red and blue disposable pens, slidewire cleaner, and a
mating connector. Additional accessories are added when
certain options are added.
TABLE 1-2. OPTIONS
OPTION
DESCRIPTION
001
Time Base X or Y
002
Event Marker (Electric)
006
Metric
7044-B-3-2
Figure 14. Model 7044B / 7045B Dimension Drawing

Model 7044B/7045B
Section 1
TABLE 1-3. OPTION SPECIFICATIONS
TIME BASE -
OPTION 001
Sweep Rates:
Eight selectable rates: 0.25, 0.5, 1, 2, 5, 10, 25, 50 sec/cm (0.5, 1,2, 5, 10, 20, 50, 100 sec/in)
X or Y axis. XXL sweep indication is provided.
Accurary: ±1% full scale at 25°C (±0.1% °C maximum).
Linearity:
±0.5% full scale at 25°C (to 0.04% / °C maximum).
EVENT MARKER - ELECTRIC - OPTION 002
Marking Area:
Upper margin aligned with X-axis position.
Excursion:
Approximately 0.05 inch.
Ink Capacity:
0.45 cm^ cartridge, writing distance 500 ft minimum.
Control:
Remotely by contact closure to ground or XXL logic control.
7044-A-4 ; 2
Figure 1-5. Time Base — Option 001
7044-A-S-1 _
Figure 1-6. Event Marker - Option 002
1-5

Model 7044B/7045B
Section II
SECTION II
INSPECTION AND INSTALLATION
2-1. INTRODUCTION.
2-2. This section provides information for incoming inspec¬
tion, installation, storage, and shipping of the 7044B and
7045B X-Y Recorders. Also included is the information
required to field install and/or modify options for the two
models.
2-1 INCOMING INSPECTION,
2-4. MECHANICAL CHECKS.
2-5. Inspect the recorder for mechanical damage,
scratches, dents, or other defects. Also check the cushion¬
ing materials for signs of severe stress.
2-6. ELECTRICAL CHECKS.
2-7. The electrical performance of the recorder should
be verified upon receipt. Performance checks, suitable for
incoming inspection as well, are presented in Section V.
2-8. DAMAGE CLAIMS.
2-9. If the recorder is damaged in transit, or fails to
meet specifications upon receipt, notify the carrier and
the nearest Hewlett-Packard office immediately. A list of
field offices is conveniently located in the back of this
manual Retain the shipping carton and padding material
for the carrier’s inspection. The field office will arrange
for replacement or repair of your recorder without
waiting for claim settlement against the carrier.
2-10. STORAGE.
2-11, When the recorder is to be stored for a period of
time, the disposable pen and the event marker cartridge
(if Option 002 is installed) should be removed and the
upper part of the carriage arm clamped to the right side
of the recorder to prevent damage during handling.
Flush event marker ink lines out with water. Seal the
recorder in moisture-proof covering with desiccant and
repackage in a container similar to the original factory *
carton.
2-12. SHIPPING.
2-13. Before returning the recorder for any reason,
notify the local field sales office of the difficulty encoun¬
tered giving the model and serial number of the recorder.
They will furnish shipping instructions. The following
precautions should be taken when repackaging the
recorder:
a. Remove disposable pen and event marker assembly
(Option 002 if installed).
b. Clamp the upper end of carriage arm and pen carriage
to the right side of recorder with shipping clamp (HP Part
No. 07040-60921) to prevent movement while in transit.
c. Wrap recorder in heavy paper or plastic and surround
with three to four inches of shock-absorbing material to
cushion and prevent movement inside shipping container.
Container should be sufficiently durable to prevent dam¬
age to recorder during handling. If in doubt, request
a shipping carton from the nearest Hewlett-Packard Sales/
Service Office.
2-14. RECORDER INSTALLATION.
2-15. MECHANICAL INSTALLATION.
2-16. The recorder is equipped with built-in rack
mounting brackets for placing in a standard 19-inch cab¬
inet. Four screws (two on each side) are used for easy
installation. Feet and side trim panels are provided for
bench type operation. Remove side trim panels before
rack mounting. See Figure 2-1.
7045-A-14-1
Figure 2-1. Side Trim Panel Removal
2-1

Section II
Model 7044B/7045B
2-17. COOLING. operating requirements. The following paragraphs describe
those options that can be installed in the field.
248. Cooling is provided by convection. The location of
mounting of the recorder must ensure adequate air
circulation. 241. EVENT MARKER - OPTION 002.
2-22. Installation is accomplished for either model per the
instructions accompanying Event Marker Kit, Part Number
07044-60001.
2-19. OPTION INSTALLATION/CONVERSION.
2-20. These two models may be equipped with options
which can increase the versatility and application to special
2-2

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

Section III
Model 7044B/7045B
1 2 3 5 1 2 3 5 7 8
7044-A-8-2
L POLARITY SWITCHES (~RT +RT, -UP, +UP). Two toggle switches; one for the X-axis and the other for
the Y-axis; provide polarity reversal.
2. RESPONSE SWITCH (7045B ONLY). A two-position toggle switch labeled SLOW and FAST. Use SLOW
position for making prerecording adjustments, and also, if desired, record slow incoming signals or reduce speed
of instrument.
3. ZERO CONTROLS. A control in each axis for adjusting the pen’s zero position on the chart.
4. ZERO CHECK SWITCHES. A pushbutton switch to verify the zero setting of either the X or Y axis. When
actuated, the input signal is disconnected and the pen returns to its zero position.
5. RANGE SWITCHES. A selector switch for each axis allowing the selection of 14 calibrated positions.
6. ' VERNIER CONTROL. A vernier control in each axis for multiplication of input range setting; overlaps two
adjacent calibrated ranges.
7. LINE SWITCH. A two-position toggle switch; OFF and ON; that controls the application of the ac line voltage
to the recorder.
8. CHART SWITCH. A two-position toggle switch; RELEASE and HOLD; that controls the chart holding func¬
tion of the Autogrip table.
9. SERVO SWITCH. A two-position toggle switch; STANDBY and ON; that controls servo actuation for both
axes.
10. P EN SWITCH. A two-position toggle switch; LIFT and RECORD; that controls the lowering and raising of
the pen.
IL INPUT TERMINALS. Two input terminals are available for each axis. They are labeled HI and LO and will
accept either open wire or banana plug connectors.
12. TIME BASE - OPTION 001. One control knob for the selection of eight sweep speeds in either axis. To
determine the axis, place toggle switch from OFF to X or Y, then select sweep using sweep rate knob. RESET/
' START toggle switch stops sweep cycle, lifts pen, and resets pen to original starting position when placed in
RESET; in START position, drops pen, sweeps pen across chart at selected rate,
13. VERNIER SWITCH: A selector switch for each axis which allows the vernier control to be switched ON or
OFF,
Disconnect input signal from axis, which has been
placed in Time Base Mode, before starting sweep cycle.
Figure 3-1. Control Panel — 7044B and 7045B
CAUTION
rf-tur
3-2

Model 7044B/7045B
CEE 7-VM
NEMA 6 15P
c=u cm
~\®r
SEV 1011
HP Part Number 8120435 j; 250V, 13A, 10 plug rating.
(For use in United Kingdom, Cyprus, Nigeria, Rhodesia,
Singapore)
HP Part Number 81204369; 250V, 10A, 10 plug rating.
(For use in Australia, New Zealand)
HP'Part Number 8120-2857; 250V, J0/16A, 10 plug
rating. (For use in East and West Europe, Saudi Arabia,
Egypt)
HP Part Number 8120-1378; 125V, 15A, 10 plug rating.
(UL approved; for use in United States, Canada, Japan,
Mexico, Philippines, Taiwan)
HP Part Number 8120-0698; 250V, 15A, 10p)ug rating.
(UL approved; for use in United States)
HP Part Number 8120-2104; 250V, 10A, 10 plug rating.
(For use in Switzerland)
HP Part Number 8120-2956; 250V, 10A, 10 plug rating.
(For use in Denmark)
NOTE: All plugs are viewed from connector end.
• L ~ Line or Active Conductor (also called “live” or “hot”)
• N = Neutral or Identified Conductor
• E ~ Earth or Safety Ground
Figure 3-2. Power Cord Configurations
Section III
Option Number
900
901
902
903
904
906
912
3-3

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.
34

Model 7044B/7045B
Section III
7044-A-10-2
Figure 34. Rear Connector
3-5