1502: Difference between revisions

Latest revision as of 03:52, 24 September 2024

Tektronix 1502

Time Domain Reflectometer

Produced from 1975 to (?)

Manuals

Other

(All manuals in PDF format unless noted otherwise)

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
Underside of 1502 with stripline sampler and pulser exposed
Sampling gate near the BNC end of stripline
Pulser end of the stripline
Pulser TD removed from stripline
Pulser TD curve traced with a 576
HV board top view
HV board bottom view
Tek 1502 with printer
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

@@ Line 3: / Line 3: @@
 |model=1502
 |class=Reflectometer
-|series=
+|series=1500
 |summary=Time Domain Reflectometer
 |image=Tek1502-front.JPG
-|caption=Tektronix 1502 Time Domain Reflectometer (CRT version)
+|caption=Tektronix 1502 Time Domain Reflectometer
 |introduced=1975
 |discontinued=(?)
 |designers=Hans Geerling
 |manuals=
-'''1502'''
+* [[Media:070-1790-00.pdf|Tektronix 1502 Operators Manual]]
-* [[Media:070-1790-00.pdf|Tektronix 1502 Operators Manual]] (PDF)
+* [[Media:070-1792-01.pdf|Tektronix 1502 Service Manual -01]]
-* [[Media:070-1792-02.pdf|Tektronix 1502 Service Manual]] (PDF)
+* [[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]]
-'''1502B'''
+* [[Media:Tek_1502_mods.pdf|Tektronix 1502 Modifications]]
-* [[Media:070-6267-04.pdf|Tektronix 1502B Service Manual]] (PDF)
-'''1502C'''
-* [[Media:070-7168-04.pdf|Tektronix 1502C Service Manual]] (PDF)
 '''Other'''
-* [[Media:Tektronix_Y-T_chart_recorder.pdf|Tektronix Chart Recorder User/Service Manual]] (PDF)
+* [[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:070-2178-00.pdf|Watertight Sealing Procedures for 1502/1503 TDRs]] (PDF, needs OCR)
+* [[Media:Optimize falltime and aberrations 1502.pdf|Guide to Optimizing Falltime and Aberrations in the 1502]]
-* [[Media:Optimize falltime and aberrations 1502 no ocr.pdf|Guide to Optimizing Falltime and Aberrations in the 1502]] (PDF, needs OCR)
-:''Note that the manuals for the 1502B and 1503C are still available from Tektronix.''
 }}
 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.
@@ Line 43: / Line 37: @@
 ==Internals and version differences==
-The first version 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 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/C) used a liquid-crystal display and a Z80 microprocessor.
+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.
@@ Line 51: / Line 45: @@
 ==Repair issues==
-&rarr; see [[1502/Repairs]]
+→ see [[1502/Repairs]]
-==Replacement==
-MOHR Test and Measurement manufactures a direct replacement to the 1502B and 1502C using an updated version of the same pulser/sampler.
-Any procedures or recorded waveforms are repeatable using the MOHR TDR.''[http://www.mohr-engineering.com/ct100 CT100B TDR Cable Analyzer]''.
 ==Links==
-* Ivan Ivanov, ''[[Media:Tekscope_1975_V7_N2.pdf|Two weatherproof TDR cable testers for field use]]''. TekScope Vol.7 No.2 1975 p.3+
+{{Documents|Link=1502}}
+{{PatentLinks|1502}}
 ==Prices==
-: $3,750 (~$14,700 in 2022 Dollars)
+: $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==
-'''1502'''
 <gallery>
 Tek1502-top.JPG|Top boards of the 1502
@@ Line 80: / Line 70: @@
 _Front_metric_version.jpg|Tek 1502 Metric Version (Option 5)
 </gallery>
-'''1502B'''
+==Components==
-<gallery>
+{{Parts|1502}}
-Tek 1502b 1.jpg|1502B
-Tek 1502b 2.jpg|1502B
-Tek 1502b 3.jpg|1502B
-Tek 1502b 4.jpg|1502B
-</gallery>
 [[Category:Time-domain reflectometers]]