1502: Difference between revisions

From TekWiki
Jump to navigation Jump to search
No edit summary
No edit summary
 
(58 intermediate revisions by 8 users not shown)
Line 1: Line 1:
* [http://w140.com/tek_1502c_service.pdf Tektronix 1502C Service Manual (PDF)]
{{Instrument Sidebar
* [http://w140.com/TEK-1502-OM-SM.pdf Tektronix 1502 Service Manual (PDF)]
|manufacturer=Tektronix
* [http://w140.com/tek_1502b_service.pdf Tektronix 1502B Service Manual (PDF)]
|model=1502
|class=Reflectometer
|series=1500
|summary=Time Domain Reflectometer
|image=Tek1502-front.JPG
|caption=Tektronix 1502 Time Domain Reflectometer
|introduced=1975
|discontinued=(?)
|designers=Hans Geerling
|manuals=
* [[Media:070-1790-00.pdf|Tektronix 1502 Operators Manual]]
* [[Media:070-1792-01.pdf|Tektronix 1502 Service Manual -01]]
* [[Media:070-1792-02.pdf|Tektronix 1502 Service Manual -02]]
* High-res 1502 schematics:
** [[Media:1502_Vertical_Amp.pdf|Vertical amp board]]
** [[Media:1502_Schematic_Mainborad_Components.pdf|Main board]]
** [[Media:1502_SCHEMATIC-Output_Amp.png|Output amplifier]]
* [[Media:Tek_1502_Wizard_Workshop.pdf|Tektronix 1502 Wizard Workshop Articles]]
* [[Media:Tek_1502_mods.pdf|Tektronix 1502 Modifications]]
 
'''Other'''
* [[Media:Tektronix_Y-T_chart_recorder.pdf|Tektronix Chart Recorder User/Service Manual]]
* [[Media:070-2178-00.pdf|Watertight Sealing Procedures for 1502/1503 TDRs]]
* [[Media:Optimize falltime and aberrations 1502.pdf|Guide to Optimizing Falltime and Aberrations in the 1502]]
 
}}
The '''Tektronix 1502''' is a series of Time Domain Reflectometers which replaced the [[1501]] in 1975.  The 1502 is for high resolution, sister model [[1503]] for long range.
 
They are commonly used to test coaxial cables, although they have many other uses.
The US military was a major purchaser, therefore most of the first series (the 1502, no letter) will be found surplus with some sort of US military property ID tag and an NSN sticker.
 
[[Hans Geerling]] did most of the circuit design on the 1502.
 
{{MissingSpecs}}
 
==Internals and version differences==
The 1502 used a CRT and is an almost completely analog design except for some discrete digital logic used to pre-fire and fire the [[tunnel diodes|tunnel diode]] pulser. 
The later models ([[1502B]], [[1502C]]) used a liquid-crystal display and a Z80 microprocessor. 
 
The other major difference between versions is the line charging method.
The 1502 uses a fast (36 ps) tunnel diode pulser, the later models used a half sine wave to charge the line. 
The TD pulser, with its Dirac delta edge, gives much better short range sensitivity, although it is much easier to destroy.
 
==Repair issues==
→ see [[1502/Repairs]]
 
==Links==
{{Documents|Link=1502}}
{{PatentLinks|1502}}
 
==Prices==
1979: $3,750 (~$16,200 in 2024 dollars)
 
According to an [[Media:Tek Schottky Diodes Memo rot.pdf|internal memo]], in 1979 annual sales were estimated at 543 units.
 
==Pictures==
<gallery>
Tek1502-top.JPG|Top boards of the 1502
Tek1502-bottom.JPG|Underside of 1502 with stripline sampler and pulser exposed
Tek1502-samplinggate.JPG|Sampling gate near the BNC end of stripline
Tek1502-pulser.JPG|Pulser end of the stripline
Tek1502-td.JPG|Pulser TD removed from stripline
Tek1502-tdcurve.JPG|Pulser TD curve traced with a 576
TEK1502-HV-board-top.jpg|HV board top view
TEK1502-HV-board-bottom.jpg|HV board bottom view
Tek 1502 with printer.jpg|Tek 1502 with printer
Tek 1502 trace no connection.jpg
1502_Front_metric_version.jpg|Tek 1502 Metric Version (Option 5)
</gallery>
==Components==
{{Parts|1502}}
 
[[Category:Time-domain reflectometers]]

Latest revision as of 03:52, 24 September 2024

Tektronix 1502
Time Domain Reflectometer
Tektronix 1502 Time Domain Reflectometer

Produced from 1975 to (?)

Manuals
Manuals – Specifications – Links – Pictures

The Tektronix 1502 is a series of Time Domain Reflectometers which replaced the 1501 in 1975. The 1502 is for high resolution, sister model 1503 for long range.

They are commonly used to test coaxial cables, although they have many other uses. The US military was a major purchaser, therefore most of the first series (the 1502, no letter) will be found surplus with some sort of US military property ID tag and an NSN sticker.

Hans Geerling did most of the circuit design on the 1502.

Key Specifications

  • please add

Internals and version differences

The 1502 used a CRT and is an almost completely analog design except for some discrete digital logic used to pre-fire and fire the tunnel diode pulser. The later models (1502B, 1502C) used a liquid-crystal display and a Z80 microprocessor.

The other major difference between versions is the line charging method. The 1502 uses a fast (36 ps) tunnel diode pulser, the later models used a half sine wave to charge the line. The TD pulser, with its Dirac delta edge, gives much better short range sensitivity, although it is much easier to destroy.

Repair issues

→ see 1502/Repairs

Links

Documents Referencing 1502

Document Class Title Authors Year Links
Tekscope 1975 V7 N2.pdf Article Two Weatherproof TDR Cable Testers for Field Use Ivan Ivanov 1975 1502 • 1503
Tekscope 1975 V7 N3.pdf Article New Products 1975 5444 • 1502 • 1503 • 455 • E4010 • E4010-1 • 4923 • 2701 • 2703 • J6523 • WP1205
TekWeek (partial) October 10, 1975.pdf Article Spectrum analyzers require high technology Thor Hallen • Dave Friedley 1975 Spectrum Analyzers • Pentrix • 7L5 • 5L4 • 7L12 • 7L13 • 1401 • 491 • 1405 • 1502 • 1503

Prices

1979: $3,750 (~$16,200 in 2024 dollars)

According to an internal memo, in 1979 annual sales were estimated at 543 units.

Pictures

  • Top boards of the 1502

    Top boards of the 1502

  • Underside of 1502 with stripline sampler and pulser exposed

    Underside of 1502 with stripline sampler and pulser exposed

  • Sampling gate near the BNC end of stripline

    Sampling gate near the BNC end of stripline

  • Pulser end of the stripline

    Pulser end of the stripline

  • Pulser TD removed from stripline

    Pulser TD removed from stripline

  • Pulser TD curve traced with a 576

    Pulser TD curve traced with a 576

  • HV board top view

    HV board top view

  • HV board bottom view

    HV board bottom view

  • Tek 1502 with printer

    Tek 1502 with printer

  • Tek 1502 Metric Version (Option 5)

    Tek 1502 Metric Version (Option 5)

Components

Some Parts Used in the 1502

Part Part Number(s) Class Description Used in
152-0335-01 152-0335-01 Discrete component 150 ps step recovery diode 1502 • S-2 • S-4 • S-6
154-0667-00 154-0667-00 • 154-0667-01 • 154-0667-02 • 154-0667-03 CRT CRT 1502 • 1503 • 305 • 326
2N3958 151-1054-00 • 151-1054-01 • 151-1054-02 Discrete component dual n-channel JFET FG503 • MR501 • M3 • PG505 • SC501 • SC502 • SC503 • SG502 • 1450 • 1501 • 1502 • 1503 • 221 • 5A23N • 5CT1N • 577 • 603 • 603A • 604 • 604A • 605 • 606 • 606A • 606B • 607 • 607A • 620 • 624 • 7CT1N • 7D15 • 7D20 • 851
SMTD995 152-0140-01 Discrete component 10 mA, 8 pF tunnel diode 1S1 • 1S2 • 1502 • 21A • 22A • 3T5 • 3T6 • 475 • 475A • 475M • 544 • R544 • 546 • RM546 • 547 • RM547 • 556 • R556 • 581A • 585A • RM585 • 7B52 • 7B53N • 7B70 • 7B71 • 7D10 • 7D11 • 7T11 • 7T11A • R7912 • S-51 • S-52 • TU-5 • 067-0572-00 • 067-0572-01 • 067-0681-00
Retrieved from "https://w140.com/tekwiki/index.php?title=1502&oldid=97444"