HP HP-7035B User manual

TECHNICAL MANUAL
HEWLETT-PACKARD MODEL HP-7035B

Section Page
IINTRODUCTION ......................................... 1-1
Description .................................................. 1-1
1-2 Basic Frame ..................................... 1-1
1-4 Model-Manual Information.................. 1-1
1-6 Specifications ................................... 1-1
1-8 Options ............................................. 1-1
1-9 Metric Calibration (Option
001) ................................................ 1-1
1-11 X-Axis Retransmitting
Potentiometer (Option 003) .............. 1-1
1-13 Accessories ...................................... 1-1
1-15 Model 7562A Logarithmic
Converter ........................................ 1-1
1-17 Model 7563A Log Voltmeter/
Amplifier ......................................... 1-4
1-19 Model 17108A Time Base.................. 1-4
1-21 Model 10025A Straight-
through Voltage Probe .................... 1-4
1-23 Model 10111A Adapter ...................... 1-4
1-25 Model 10002A/B/C/D
Voltage Divider Probe ..................... 1-4
1-27 Model 11000A Cable
Assembly ........................................ 1-4
1-29 Typical Performance ......................... 1-4
1-30 Input Resistance vs Off
Balance Characteristics ................... 1-4
1-32 Normal Mode Noise .......................... 1-4
1-34 Dynamic Response............................ 1-5
II INSPECTION AND INSTALLATION
2-1 Introduction ....................................... 2-1
2-3 Incoming Inspection .......................... 2-1
2-4 Mechanical Checks ........................... 2-1
2-6 Electrical Checks............................... 2-1
2-8 Damage Claims................................. 2-1
2-10 Storage ............................................. 2-1
2-12 Shipping............................................ 2-1
2-14 Recorder Installation ......................... 2-1
2-16 Cooling ............................................. 2-1
2-18 Stacking H-P Instruments .................. 2-1
III OPERATING INSTRUCTIONS
3-1 Operating Requirements.................... 3-1
3-2 General ............................................ 3-1
3-4 Controls, Connectors, and.................. 3-1
Indicators
3-6 Electrical Requirements ..................... 3-1
3-7 Operating Power ............................... 3-1
3-9 Input Signals ..................................... 3-1
3-11 Grounding ........................................ 3-1
3-13 Recording Input Connections ............. 3-1
3-15 Connection Techniques for
the Guard Shield ............................. 3-1
3-17 Maximum Allowable Source
Impedance ...................................... 3-1
3-19 Operating Precautions ....................... 3-3
3-23 Operating Instructions ....................... 3-3
3-24 Operational Conditions....................... 3-3
3-26 Connect Power ................................. 3-3
3-28 Connect Inputs ................................. 3-3
3-30 Energize Recorder ............................ 3-3
Section Page
3-32 Install Paper ...................................... 3-4
3-34 Install Pen ......................................... 3-4
3-36 Zero Set ........................................... 3-4
3-38 Lower Pen......................................... 3-4
IV THEORY OF OPERATION
4-1 General Operation
Description ..................................... 4-1
4-7 Circuit Description ............................. 4-1
VMAINTENANCE, PERFORMANCE,
CHECKS AND ADJUSTMENTS
5-1 Introduction ....................................... 5-1
5-3 Preventive Maintenance .................... 5-1
5-4 General............................................. 5-1
5-6 Environmental Operation.................... 5-1
5-8 Cleaning ........................................... 5-1
5-10 Potentiometer Cleaning ..................... 5-2
5-12 Lubrication ........................................ 5-2
5-14 Visual Lubrication ............................. 5-2
5-16 Mechanical Maintenance.................... 5-2
5-17 Disassembly/Assembly...................... 5-2
5-19 Carriage Arm Removal ...................... 5-3
5-21 Pen Carriage Removal ...................... 5-3
5-23 Potentiometer Replacement -
X-Axis ............................................. 5-4
5-25 Wiper Replacement - X-Axis .............. 5-4
5-27 Potentiometer Replacement -
Y-Axis ............................................. 5-5
5-29 Wiper Replacement - Y-Axis .............. 5-5
5-31 Servo Motor Maintenance ................. 5-5
5-33 X-Axis Servo Motor
Replacement .................................. 5-5
5-35 Y-Axis Servo Motor
Replacement .................................. 5-5
5-37 Brush Replacement .......................... 5-6
5-39 Correction of Sticking
Motor Brushes ................................ 5-6
5-41 Y-Axis Restringing ............................ 5-6
5-43 X-Axis Restringing ............................ 5-6
5-45 Electrical Maintenance ...................... 5-7
5-46 Requirements ................................... 5-7
5-48 Performance Tests ............................ 5-7
5-49 Criteria ............................................. 5-7
5-51 Test Equipment ................................ 5-7
5-53 Initial Checks..................................... 5-8
5-55 Y-Axis Accuracy and
Linearity .......................................... 5-8
5-56 X-Axis Accuracy and
Linearity .......................................... 5-8
5-57 Y-Axis Slewing Speed........................ 5-8
5-58 X-Axis Slewing Speed........................ 5-8
5-59 Common Mode Rejection .................. 5-9
5-60 DC Rejection .................................... 5-9
5-61 AC Rejection .................................... 5-9
5-62 Mechanical Adjustments ................... 5-9
5-63 Procedure ......................................... 5-9
5-65 Y-Axis Drive String Tension
Check/Adjustment ........................... 5-9
iii

TABLE OF CONTENTS (CONTINUED)
Section Page
5-68 Y Gear Train Backlash
Adjustment ..................................... 5-10
5-70 Y-Axis Pen Carriage
Adjustment ..................................... 5-10
5-72 Y-Axis Alignment ............................... 5-11
5-74 X-Axis Cable Tension Check/
Adjustment ..................................... 5-11
5-77 X-Axis Drive Belt Tension
Check/Adjustment .......................... 5-11
5-80 X-Axis Drive Belt Replacement........... 5-11
5-82 X Gear Train Backlash
Adjustment ..................................... 5-13
5-84 X-Axis Track Bearing
Adjustment ..................................... 5-13
5-86 X-Axis Drive Train Bearing
Replacement ................................. 5-13
5-91 Electrical Adjustments........................ 5-14
5-92 Gain Adjustment ............................... 5-14
5-94 Calibration Adjustment....................... 5-14
5-96 Phase Shift Adjustment ..................... 5-15
VI PARTS LIST
6-1 Introduction ....................................... 6-1
6-3 Parts List........................................... 6-1
Section Page
6-4 Alphanumerical Table ....................... 6-1
6-6 Miscellaneous Parts .......................... 6-1
6-8 Recommended Spares ..................... 6-1
6-10 Code List of Manufacturers ............... 6-1
6-12 Illustrated Parts Breakdown................ 6-1
VII TROUBLESHOOTING
7-1 Introduction ....................................... 7-1
7-2 Content ............................................ 7-1
7-4 Troubleshooting ................................ 7-1
7-5 Requirements.................................... 7-1
7-7 Troubleshooting Index........................ 7-1
VIII BACKDATING
8-1 Requirements ................................... 8-1
8-2 Definitions ........................................ 8-1
8-4 Change I .......................................... 8-1
8-6 Change II .......................................... 8-3
8-8 Change III ......................................... 8-3
8-10 Change IV......................................... 8-4
8-12 Change V ......................................... 8-4
8-14 Change VI ........................................ 8-7
8-16 Change VII ....................................... 8-7
APPENDIX A REFERENCES ................................. A-1
B MAINTENANCE ALLOCATION.......... B-1
iv

LIST OF ILLUSTRATIONS
Figure Page
1-1 Model 7035B X-Y Recorder.......................... 1-0
1-2 Model 7035B X-Y Recorder- Opt. 001
(With Wing Brackets) ................................. 1-0
1-3 Instrument Identification .............................. 1-1
1-4 Dimension Drawing ..................................... 1-3
1-5 Accessories ................................................ 1-3
1-6 Input Resistance Characteristics .................. 1-5
1-7 Typical Frequency Response
(Input Filter) .............................................. 1-6
1-8 Typical Dynamic Response ......................... 1-6
2-1 Wing Bracket Installation ............................. 2-2
2-2 Stacked Configuration ................................. 2-2
3-1 Front Panel Controls (7035B and
7035B-001) Models ................................... 3-2
3-2 Rear Panel .................................................. 3-3
3-3 Disposable Pen Installation ......................... 3-4
4-1 Block Diagram............................................. 4-2
4-2 Detailed Block Diagram................................ 4-2
4-3 Range Selector ........................................... 4-3
4-4 Input Filter .................................................. 4-3
4-5 Zero Circuit ................................................. 4-3
4-6 Slidewire and Damping Circuit...................... 4-3
4-7 Photochopper and Balance Circuit................ 4-4
4-8 Differential Amplifier..................................... 4-4
4-9 Voltage Amplifier ......................................... 4-5
4-10 Amplifier/Demodulator ................................. 4-5
4-11 Motor Control and Demodulator ................... 4-5
4-12 Power and Reference Supply ...................... 4-6
4-13 Neon Driver. ............................................... 4-6
4-14 Autogrip Power Supply ................................ 4-6
4-15 Pen Drop Supply ......................................... 4-6
5-1 Potentiometer Cleaning ............................... 5-2
5-2 Potentiometer Lubrication............................. 5-2
5-3 Tilting Out Entire Circuit Board
Assembly................................................... 5-3
5-4 Side Panel Removal .................................... 5-3
Figure Page
5-5 Pen Scale Removal ..................................... 5-4
5-6 Carriage Arm Removal ................................ 5-4
5-7 Removal of X-Axis Rebalance
Potentiometer ........................................... 5-4
5-8 X-Axis Wiper Protection ............................... 5-4
5-9 Servo Motor Maintenance and
Backlash Adjustments ............................... 5-5
5-10 Nylon Cable (Attachment to Pen
Block)........................................................ 5-6
5-11 Restringing Diagram.................................... 5-7
5-12 Y-Axis Slewing Speed Test Setup................. 5-8
5-13 Slewing Speed Determination....................... 5-9
5-14 X-Axis Slewing Speed Test Setup................. 5-9
5-15 Y-Axis Drive String Tension Check............... 5-10
5-16 Y-Axis Backlash Adjustment
(Gear Adjusting Screw) ............................. 5-10
5-17 Y-Axis Backlash Adjustment
(Gear Locking Screw) ................................ 5-10
5-18 Y-Axis Pen Carriage Adjustment................... 5-11
5-19 Y-Axis Alignment ......................................... 5-12
5-20 X-Axis Cable Tension Check ....................... 5-12
5-21 X-Axis Drive Belt Tension Check ................. 5-12
5-22 Drive Train Adjustments .............................. 5-13
5-23 X-Axis Gear Train Bearings ......................... 5-14
5-24 Circuit Board Adjustment ............................. 5-15
6-1 Exploded View - Cabinet ............................. 6-9
6-2 Exploded View - Carriage Arm
(Sheet 1 of 2) ............................................ 6-10
6-2 Exploded View - Carriage Arm
(Sheet 2 of 2) ............................................ 6-11
7-1 Component Identification -
Frame ....................................................... 7- 8
7-2 Component Identification -
Circuit Board ............................................. 7-9
7-3 Schematic Model 7035B
(D-07035-92550) ....................................... 7-10
8-1 Component Identification - Circuit.................
Board ........................................................ 8-2
8-2 Control Panels - Model S 0735B
and 7035B-001 ......................................... 8-3
8-3 IEC Power Connection ................................ 8-4
8-4 Filling Ink Pen ............................................. 8-4
8-5 Exploded View - Carriage Arm ..................... 8-6
LIST OF TABLES
Table Page
1-1 Model 7035B Specifications ......................... 1-2
1-2 Accessory Supplies ..................................... 1-4
5-1 Recommended Test Equipment ................... 5-8
6-1 Parts List .................................................... 6-2
6-2 Miscellaneous Parts .................................... 6-6
Table Page
6-3 Recommended One Year
Isolated Spare Parts List ........................... 6-7
6-4 Manufacturer's Code List ............................. 6-8
7-1 7035B Troubleshooting Index ...................... 7-2
v

SECTION O
INTRODUCTION
O-1. Scope
This manual contains the general description, installation,
operation, principles of operation, and maintenance of the test
instrument, which is known as the Recorder RO-458(V)1/U
(HP-7035B).
O-2. Index of Technical Publications
Refer to the latest issue of DA Pam 310-4 to determine
whether there are new editions, changes, or additional
publications pertaining to the equipment.
O-3. Maintenance Forms, Records and Reports
a. Reports of Maintenance and Unsatisfactory
Equipment. Department of the Army forms and procedures
used for equipment maintenance will be those prescribed by
TM 38-750, The Army Maintenance Management System.
b. Report of Packaging and Handling Discrepancies. Fill
out and forward SF 364 (Report of Discrepancy (ROD)) as
prescribed in AR 735-11-2/DLAR 414.55/NAVMATINST
4355.73/AFR 400.54/MCO 30.3E.
c. Discrepancy in Shipment Report (DISREP) (SF 361).
Fill out and forward Discrepancy in Shipment Report (DISREP)
(SF 361) as prescribed in AR 55-38/NAVSUPINST
4610.33B/AFR 75-18/MCOP4610.19C/DLAR 4500.15.
O-4. Reporting Equipment Improvement
Recommendations (EIR)
If your Recorder RO-458(V)1/U needs improvement, let us
know. Send us an EIR. You, the user, are the only one who
can tell us what you don't like about your equipment. Let us
know why you don't like the design. Tell us why a procedure is
hard to perform. Put it on an SF 368 (Quality Deficiency
Report). Mail it to Commander, US Army Communications-
Electronics Command, ATTN: DRSEL-ME-MQ, Fort
Monmouth, NJ 07703. We'll send you a reply.
O-5. Administrative Storage
For administrative storage of your transmission level and return
loss measuring set, wrap set in heavy kraft paper and tape
securely with packaging tape.
O-6. Destruction of Army Electronics Materiel
Destruction of Army electronics materiel to prevent enemy use
shall be in accordance with TM 750-244-2.
O-7. Warranty Information
The R0-458(V)1/U (Model HP-7035B) X-Y Recorder is
warranted by the HEWLETT-PACKARD company for one year
from the date of shipment. Warranty period starts on the date
found in block 23 of DA Form 2408-9 in the logbook. Report all
defects in material or workmanship to your supervisor, who will
take appropriate action through your organizational
maintenance shop.
O-1

FIGURE 1-1. MODEL 7035B X-Y RECORDER
FIGURE 1-2. MODEL 7035B X-Y RECORDER - OPTION 001 (WITH WING BRACKETS)
1-0

SECTION I
INTRODUCTION
1-1. DESCRIPTION
1-2. BASIC FRAME
1-3. The Hewlett-Packard Model 7035B X-Y Recorder is a
general purpose laboratory instrument designed for plotting
cartesian coordinate graphs from dc electrical sources.
Specially guarded and shielded circuitry provides one megohm
input resistance at null on all fixed and variable ranges from
100 mV/in. (40 mV/cm) and above. Five calibrated dc input
ranges in each axis, the most sensitive is used
potentiometrically, are standard features. Arbitrary full scale
voltage ranges may be used with calibrated de ranges by using
a variable input attenuator. The Autogrip holddown platen
accepts standard 8-1/2 x 11 inches or smaller graph paper.
The instrument is readily adaptable from bench to rack
mounting by installing the wing brackets provided. See
Figures 1-1 and 1-2 for general configuration.
1-4. MODEL-MANUAL INFORMATION
1-5. This manual is applicable to the Model 7035B with a
serial prefix of 1114A. 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 necessary,
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.
FIGURE 1-3. INSTRUMENT IDENTIFICATION
1-6. SPECIFICATIONS
1-7. Table 1-1 lists the specifications available with this
recorder. Figure 1-4 illustrates the outside dimensions.
1-8. OPTIONS
1-9. METRIC CALIBRATION (OPTION 001)
1-10. Ordering this option will provide a metrically scaled and
calibrated version of this instrument. (HP Service Center
installation only.)
1-11. X-AXIS RETRANSMITTING POTENTIOMETER
(OPTION 003)
1-12. This option provides a potentiometer that is coupled to
the X-axis drive system. The potentiometer is 5K ±3% with
±0.1% linearity, and 0.04% resolution.
1-13. ACCESSORIES
1-14. Accessories supplied with each instrument depend on
the configuration of the instrument, and are listed in Table 1-2.
Other accessories for special applications may be ordered.
These accessories which do not require modification of the
recorder are described in the following paragraphs.
1-15. MODEL 7562A LOGARITHMIC CONVERTER
1-16. The Model 7562A Logarithmic Converter produces de
output voltages in logarithmic relationship to other dc input
voltages, or true amplitude RMS of ac input voltages, in a 10,
000 to 1 (80 dB) amplitude range. The all solid state, single
channel converter allows semilog plotting with X-Y and strip
chart recorders. Two converters may be used for log-log
records. An oscilloscope output is also provided for waveform
monitoring using oscilloscopes. A broad frequency range, 100
kHz to 0.5 Hz, increases its usefulness.
1-1

TABLE 1-1. MODEL 7035B SPECIFICATIONS
PERFORMANCE
Input Range: 1, 10, 100 mV/in.; 1 and 10 V/in. (Option 001,
Metric calibration: 0.4, 4, 40, 400 mV/cm and
4 V/cm). Continuous vernier between ranges.
Type of Input: Floated and guarded signal pair. Input may be
operated up to ±500 Vdc with respect to chassis ground.
Signal and guard terminals are available at the front panel
or at a rear connector. Mating rear connector supplied.
Input Resistance:
Range Input Resistance:
1 mV/in. (0.4 mV/cm) Potentiometric.
(essentially in-
finite at null)
Variable 11k
10 mV/in. (4 mV/cm) 100k
Variable 100k
100 mV/in. (40 mV/cm) 1 meg
Variable 1 meg
1 V/in. (400 mV/cm) 1 meg
Variable 1 meg
10V/in. (4 V/cm) 1 meg
Variable 1 meg
Maximum Allowable Source Resistance: 20k ohm on most
sensitive range, no restriction on other ranges.
Normal Mode Rejection (at line frequency): > 30 dB (18
dB/octave roll-off above 60 Hz).
Common Mode Rejection: Conditions for the following data are
DC or line frequency AC with up to 1K ohm between the
positive input and negative input, and the negative input
connected to the guard terminal. Maximum allowable DC
or DC plus peak AC common mode voltage is 500V.
Range
Standard Metric DC (CMR) AC (CMR)
1 mV/in. 0.4 mV/cm 130 dB 100 dB
10 mV/in. 4 mV/cm 110 dB 80 dB
100 mV/in. 40 mV/cm 90 dB 60 dB
1V/in. 400 mV/cm 70 dB 40 dB
10 V/in. 4 V/cm 50 dB 20 dB
Slewing Speed 20 in/s, 50 cm/, nominal at 115V line.
Accuracy: ±0.2% of full scale.
Linearity: ±0.1% of full scale.
Resettability: ±0.1% of full scale
Reference Stability: Continuous electronic zener reference with
temperature stability better than 0.002%/degrees C.
Zero Set: Zero may be placed anywhere on the writing area or
electrically off scale up to one full scale from zero index.
Adjustable by a locking ten-turn, high resolution control.
GENERAL
Writing Mechanism: Servo actuated ink pen.
Writing Area: 7 in. X 10 in. (18 cm X 25 cm).
Paper Holddown: Autogrip electric paper hold-down grips
charts 8-1/2 in. X 11 in. or smaller. Special paper is not
required.
Pen Lift: Electric pen lift with provision for remote control.
Power: 115 or 230 V ± 10%, 50 to 60 Hz, approximately 45 W.
Weight: Net, 18 lb (8 kg; shipping, 24 lb (10.9 kg)
1-2

FIGURE 1-4. DIMENSION DRAWING
FIGURE 1-5. ACCESSORIES 1-3

TABLE 1-2. ACCESSORY SUPPLIES
1251-0293 Connector, Male, 24 pin 2110-0063 Fuse, 3/4 Amp (1)
(Mate to J-602)(1)
5080-7979 Pen, Disposable, Red Pack of 3 (1) 2110-0065 Fuse, 3/8 Amp (1)
5080-7980 Pen, Disposable, Blue Pack of 3 (1) 9270-1006 Graph Paper, English Calibrated
(Heavy) (10)
1540-0149 Plastic Box (1) 9270-1007 Graph Paper, English Calibrated
9220-1519 Filler Pad (1) (Light) (10)
5080-3635 Slidewire Lubricant (1) 9270-1023 Graph Paper, Metric Caption-001,
Calibrated (Heavy) (10)
5080-3605 Slidewire Cleaner (1) 9270-1027 Graph Paper, Metric Caption-001,
8120-1378 Power Cord (1) Calibrated (Light) (10)
1-17. MODEL 7563A LOG VOLTMETER/ AMPLIFIER
1-18. The Model 7563A DC Log Voltmeter/Amplifier is
designed to perform two independent operations. As a
voltmeter, usable over a 110 dB input amplitude range,
accurate readings within 1.5 dB over an 80 dB dynamic range
are achieved, and the need for range switching is
unnecessary. As a log amplifier, output signals are
logarithmically related to applied input signals; this solid-state
amplifier permits semilogplotting operations with HP X-Y and
strip-chart recorders, and will operate with most other
recorders and oscilloscopes. Two amplifiers may be used for
log-log records.
1-19. MODEL 17108A TIME BASE
1-20. The 17108A is a self-contained external time base which
will operate on either axis of the 7035B. Any number of
recorders may be driven simultaneously providing the
combined parallel input impedance is 20, 000 ohms or more.
Five sweep speeds are provided from 0.5 to 50 seconds/inch.
1-21. MODEL 10025A STRAIGHT-THROUGH VOLTAGE
PROBE
1-22. The 10025A is a flexible probe with small, pushbutton
pincer jaws which provide a straight-through connection to the
7035B. Maximum input voltage is 600 volts peak. The cable is
terminated in a shielded dual banana plug.
1-23. MODEL 10111A ADAPTER
1-24. The 10111A (shielded banana-post-to-female-BNC)
converts banana post inputs on 7035B to shielded BNC inputs
for low-level signal work. This adapter may be used in pairs for
balanced input characteristics.
1-25. MODEL 10002A/B/C/D VOLTAGE DIVIDER PROBE.
1-26. The Voltage Divider Probe (50:1) extends the voltage
range of the 7035B to 1000 volts full scale. The high input
impedance (9 meg of this probe also reduces the loading of the
7035B on the system under test. Accuracy is ± 3%, requires
10111 Adapter, and not usable on the 1 mV/in. and 10 mV/in.
(0.4 mV/cm and 4 mV/cm) ranges. The length of the 10002A
is 5 feet, 10002B is 10 feet, 10002C is 5 feet with a black
identification boot, and the 10002C is 10 feet with a black
identification boot.
1-27. MODEL 11000A CABLE ASSEMBLY
1-28. Dual banana plugs terminate a section of 50-ohm cable,
44 inches overall, plugs for binding posts spaced 3/4 inch.
1-29. TYPICAL PERFORMANCE
1-30. INPUT RESISTANCE VS OFF BALANCE
CHARACTERISTICS
1-31. The input resistance is constant, regardless of off
balance condition except for the 1 mV/in. (0.4 mV/cm) range.
This range, operating in potentiometric mode, draws all the
current flowing in the balance loop through the input circuit.
Referring to Figure 1-6, observe that a linear relationship exists
between the distance off balance and the input resistance, and
because the input resistance at 1% of full scale off balance is
approximately 10 meg ohms, a small off balance condition is
noticeable.
1-32. NORMAL MODE NOISE
1-33. This instrument is designed to record dc signals.
Normal mode noise (like frequency) is often superimposed on
the low frequency, which if not eliminated, may produce
unsatisfactory recordings. An excessive amount of noise can
1-4