Mohr CT100 User manual

Operator's Manual
CT100 and CT100HF
Automated Metallic Time-Domain Reflectometers
Part No.: CT100-M-OM-004
CAGE Code: 4JEE1
Revised: August 12, 201

Copyright Notice
Copyright Notice
Copyright © 2013 MOHR Test and Measurement LLC (MOHR). ll rights reserved.
Reproduction of this manual in print and electronic form is authorized for U.S. Government purposes only. This
manual may not be reproduced, distributed, transmitted, displayed, published or broadcast in any form or medium by
any other party without written permission from MOHR.
MOHR products are covered by U.S. and foreign patents, issued and pending. Information in this publication
supersedes all previously published material. MOHR reserves the right to change product specifications or pricing at
any time without notice.
MOHR Test and Measurement, 1440 gnes Street, Richland, W 99352 US
ii

Warranty
Warranty
Purchase and/or use of this product signifies your agreement to the terms of this Warranty. MOHR Test and
Measurement LLC (MOHR) warrants that this product will be free from defects in materials and workmanship for a
period of one (1) year from the date of shipment. If any such product proves defective during this warranty period,
MOHR, at its option, either will repair the defective product without charge for parts and labor, or will provide a
replacement in exchange for the defective product.
In order to obtain service under this Warranty, customers must notify MOHR of the defect before the expiration of the
warranty period and make suitable arrangements for the performance of service. Customers shall be responsible for
packaging and shipping the defective product to MOHR with shipping charges prepaid. Customer shall be
responsible for paying all return shipping charges, duties, taxes, and other charges for units returned to any location.
This Warranty is given by MOHR with respect to this product in lieu of any other warranties expressed or implied.
MOHR and its vendors disclaim any implied warranties of merchantability or fitness for a particular purpose. MOHR’s
responsibility to repair or replace defective units is the sole and exclusive remedy provided to the customer for breach
of the Warranty. MOHR and its vendors will not be liable for any indirect, special, incidental, or consequential
damages irrespective of whether MOHR or the vendor has advance notice of the possibility of such damages.
Specific limitations of this Warranty:
This Warranty only applies to normal and reasonable use of this product. Damage to this product resulting
from improper use, the determination of which is solely at the discretion of MOHR, is specifically excluded
from this Warranty.
Electrical damage to this product resulting from connection of a cable or device carrying a static electrical
charge to the front panel BNC connector or SMA connector without first properly grounding the conducting
elements of the cable or device is specifically excluded from this Warranty.
Electrical damage to this product resulting from connection of a cable or device carrying an electrical signal
or other non-zero electrical potential relative to earth ground to the front panel BNC connector or SMA
connector is specifically excluded from this Warranty.
iii

Contacting
Contacting MOHR Test and Measurement MOHR Test and Measurement
Phone
Phone
Sales 1-509-946-0941
Technical Support 1-509-946-2240
Toll-free 1-888-852-0408
Mail
Mail
MOHR Test and Measurement
1440 gnes Street
Richland, W 99352
US
E-mail
E-mail
[email protected]
Web
Web
www.mohr-engineering.com
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Table o Contents
Table o Contents
Copyright Notice.................................................................................................................................ii
Warranty.............................................................................................................................................iii
Contacting MOHR Test and Measurement.......................................................................................iv
Phone............................................................................................................................................iv
Mail................................................................................................................................................iv
E-mail............................................................................................................................................iv
Web...............................................................................................................................................iv
General Information............................................................................................................................1
Product description........................................................................................................................1
Battery pack and C power requirements.....................................................................................2
Options and accessories................................................................................................................2
Unpacking and initial inspection....................................................................................................2
Repacking for shipment.................................................................................................................2
Safety Summary.................................................................................................................................5
Terms in the manual......................................................................................................................5
Terms on the product.....................................................................................................................5
D NGER....................................................................................................................................5
W RNING ................................................................................................................................5
C UTION...................................................................................................................................5
Symbols in the manual...................................................................................................................6
Symbols on the product.................................................................................................................6
Static charge..................................................................................................................................6
Fuses.............................................................................................................................................6
C power source...........................................................................................................................6
Grounding the CT100....................................................................................................................7
Danger arising from loss of ground................................................................................................7
Explosive atmospheres..................................................................................................................8
Do not remove covers or panels....................................................................................................8
Connecting cables to the front panel BNC....................................................................................8
Battery replacement and disposal.................................................................................................8
Operating Instructions........................................................................................................................9
Overview........................................................................................................................................9
Handling.....................................................................................................................................9
Powering the CT100..................................................................................................................9
Caring for the battery...............................................................................................................10
Charging and power status......................................................................................................10
Batteries and long-term storage..............................................................................................11
Low battery..............................................................................................................................11
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Preparing to use the CT100.........................................................................................................12
Front panel controls and connectors...........................................................................................12
Rear panel connectors and switches...........................................................................................15
Setting up the CT100...................................................................................................................16
Setting date and time...............................................................................................................16
Navigating dialog boxes..........................................................................................................16
Display features...........................................................................................................................17
License codes..............................................................................................................................17
Menu selections and function buttons.........................................................................................18
M-FUNC button........................................................................................................................18
SC N button and menu...........................................................................................................18
SELECT button........................................................................................................................20
UTOFIT..................................................................................................................................20
CURSOR.................................................................................................................................20
LIBR RY button and menu.....................................................................................................20
MENU button and top-level menu selections..........................................................................21
Test preparations.........................................................................................................................32
Velocity of propagation............................................................................................................32
Change Vp...............................................................................................................................32
Find an unknown Vp................................................................................................................33
Temperature correction...........................................................................................................34
Cable test procedures..................................................................................................................34
Distance to fault.......................................................................................................................34
Common types of cable faults.................................................................................................37
Reflection coefficient measurements......................................................................................39
Return loss measurements......................................................................................................39
Ohms-at-cursor........................................................................................................................40
VSWR......................................................................................................................................40
Relative distance measurements............................................................................................40
Scan a trace.............................................................................................................................41
Select a trace...........................................................................................................................41
Store a trace............................................................................................................................43
Load a trace (cable records)....................................................................................................44
Storage space..........................................................................................................................45
View the difference between traces........................................................................................46
View a first derivative of a trace...............................................................................................47
View a Fast Fourier Transform of a trace................................................................................47
View S-Param trace.................................................................................................................48
Calibrated S-Param trace........................................................................................................48
Remote control........................................................................................................................48
Cable type................................................................................................................................49
Measurement...........................................................................................................................49
Configurations..........................................................................................................................52
CT Viewer™.....................................................................................................................................53
Options and ccessories.................................................................................................................55
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Options ........................................................................................................................................55
ccessories .................................................................................................................................55
Standard accessories (CT100)................................................................................................55
Standard high-frequency accessories (CT100HF)..................................................................55
Optional accessories (CT100 / CT100HF)..............................................................................56
Service accessories (CT100 / CT100HF)................................................................................56
ppendix : Specifications..............................................................................................................57
Electrical specifications................................................................................................................57
Mechanical specifications............................................................................................................59
Weight......................................................................................................................................59
Dimensions..............................................................................................................................59
Environmental specifications.......................................................................................................59
Temperature............................................................................................................................59
Certifications and Compliances...................................................................................................60
EC............................................................................................................................................60
FCC Compliance.....................................................................................................................60
ppendix B: Subassembly Drawings and Parts List.......................................................................61
Subassembly drawings................................................................................................................61
Parts list.......................................................................................................................................68
ppendix C: Operator Performance Check....................................................................................71
General information.....................................................................................................................71
Required equipment.....................................................................................................................71
Getting ready................................................................................................................................71
Reflected Rise Time Check (10-90%).........................................................................................72
Reflected Rise Time Check (20-80%).........................................................................................73
Jitter, Noise, and Sampling Efficiency Check..............................................................................73
Output Impedance Check............................................................................................................73
Pulse mplitude Check................................................................................................................74
Pulse Width Check.......................................................................................................................74
Pulse Repetition Rate Check.......................................................................................................74
Sequential Sampling Rate Check................................................................................................75
Vertical Scale Check....................................................................................................................75
Vertical ccuracy Check..............................................................................................................75
Vertical Position Check................................................................................................................75
Input Susceptibility Check............................................................................................................75
Distance Cursor Resolution Check..............................................................................................75
Cursor Readout Range Check.....................................................................................................75
Cursor Readout Resolution Check..............................................................................................76
Distance Measurement ccuracy Check.....................................................................................76
Ohm Readout Range Check........................................................................................................76
Resolution Check.........................................................................................................................76
Vertical ccuracy Check..............................................................................................................77
Horizontal Scale Check................................................................................................................77
Horizontal Range Check..............................................................................................................77
Horizontal Position Check............................................................................................................77
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Pulse Frequency Check...............................................................................................................77
ppendix D: Calibration Procedures...............................................................................................79
General information.....................................................................................................................79
Calibration interval.......................................................................................................................79
Required equipment.....................................................................................................................79
Getting ready................................................................................................................................79
Pulse measurement checks (optional).........................................................................................80
Turn off temperature adjustment.................................................................................................80
Set manual calibration values......................................................................................................81
Capacitive load calibration...........................................................................................................81
Driver start calibration..................................................................................................................82
Resistive load calibration.............................................................................................................82
Vertical calibration........................................................................................................................82
Manually verify calibration values................................................................................................82
Manually verify capacitive calibration......................................................................................82
Manually verify resistive load calibration.................................................................................84
Enable temperature adjustment...................................................................................................87
Horizontal calibration...................................................................................................................87
Clear temperature lookup table...................................................................................................89
ppendix E: Operator Troubleshooting...........................................................................................91
General information.....................................................................................................................91
Power on test...............................................................................................................................91
Functional block diagram and troubleshooting flowcharts...........................................................91
ppendix F: Vp of Common Cables..............................................................................................103
Cable types................................................................................................................................103
Dielectric material..................................................................................................................103
RG standards.........................................................................................................................103
MIL-C-17 standards...............................................................................................................104
Commercial designations......................................................................................................105
Twisted pair...........................................................................................................................105
ppendix G: Maintenance and Service Instructions.....................................................................107
Cleaning and lubrication............................................................................................................107
Cleaning and lubrication interval................................................................................................107
Battery removal..........................................................................................................................107
Inspection...................................................................................................................................108
Inspection interval......................................................................................................................108
Calibration and calibration interval.............................................................................................108
Glossary.........................................................................................................................................109
Index...............................................................................................................................................115
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List o Figures
List o Figures
Figure 1: Diagram of the front panel of the CT100 / CT100HF......................................................12
Figure 2: Diagram of the rear panel of the CT100 / CT100HF.......................................................15
Figure 3: Screenshot showing typical features of the CT100 display.............................................17
Figure 4: Screenshot showing UTOFIT result..............................................................................33
Figure 5: Screenshot showing Vp determination............................................................................34
Figure 6: UTOFIT cable................................................................................................................35
Figure 7: fter adjusting the vertical scale......................................................................................36
Figure 8: zoomed-in view of the cable fault.................................................................................36
Figure 9: n open cable fault..........................................................................................................37
Figure 10: short cable fault..........................................................................................................37
Figure 11: n open cable fault at 1000 ft........................................................................................38
Figure 12: 50 Ω to 75 Ω BNC to SM interconnect.....................................................................41
Figure 13: Screenshots showing selection of a live trace...............................................................42
Figure 14: Saving a trace................................................................................................................43
Figure 15: Loading a trace..............................................................................................................44
Figure 16: Difference trace..............................................................................................................46
Figure 17: First-derivative plot.........................................................................................................47
Figure 18: CT100 complete mechanical and electrical assembly..................................................62
Figure 19: CT207 (power) subassembly.........................................................................................63
Figure 20: CT208 (analog) subassembly........................................................................................64
Figure 21: CT209 (back panel) subassembly.................................................................................65
Figure 22: CT290 (front panel) subassembly.................................................................................66
Figure 23: CT290HF (front panel) subassembly.............................................................................67
Figure 24: Trace preparation for rise time measurement...............................................................72
Figure 25: Cursor placement for determination of 10-90% rise time..............................................73
Figure 26: Example of an incomplete capacitive calibration...........................................................83
Figure 27: Example of a correctly set capacitive calibration...........................................................84
Figure 28: Typical trace from a CT100 with a shorting terminator applied to the test port.............85
Figure 29: Hybrid Comp adjustment with open BNC and cursor at the reflected rise....................85
Figure 30: Hybrid Comp adjustment with open terminator, detail...................................................86
Figure 31: Hybrid Comp adjustment with the shorting terminator..................................................86
Figure 32: Hybrid Comp adjustment with the shorting terminator, detail........................................87
Figure 33: Identification of cable start position...............................................................................88
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List o Tables
List o Tables
Electrical specifications....................................................................................................................57
Mechanical specifications: weight....................................................................................................59
Mechanical specifications: dimensions............................................................................................59
Environmental specifications............................................................................................................59
Subassemblies and parts list...........................................................................................................68
Cable types: Dielectric materials....................................................................................................103
Cable types: RG standards............................................................................................................103
Cable types: MIL-C-17 standards..................................................................................................104
Cable types: Commercial designations..........................................................................................105
Cable types: Twisted pair...............................................................................................................105
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