Measuring the
invisible.
From analogue bridges to digital impulse and partial-discharge analysis: a documented family tree, not an unqualified claim that nobody else ever built similar instruments.
Pick a measurement tradition.
The positions below reflect source-dated milestones. Where a contemporary product has no reliably established introduction year, it is shown as undated — not guessed.
A microsecond, captured
Voltage impulses have to be recorded faithfully, repeatedly, and compared years later.
early impulse measurement analyser
retrospective brochure visual; model not named · Source S-F2-016
HiAS 740
retrospective brochure diagram · Source S-F2-016
HiAS 742
retrospective brochure diagram · Source S-F2-016
HiAS 743
retrospective brochure diagram · Source S-F2-016
HiAS 744 / 744-REF
undated latest-generation in original brochure · Source S-F2-016
A product-family continuity is not identical to a first-in-world claim.
Measure what escapes
Over half a century of TETTEX bridges and successors for diagnosing dielectric losses.
TETTEX 2801
brochure visual introduction; 1986 history hints earlier 1955 development · Source S-F2-017
TETTEX 2876
brochure visual; NOT model 2820 · Source S-F2-017
TETTEX 2816
brochure visual · Source S-F2-017
TETTEX 2820
brochure visual · Source S-F2-017
TETTEX 2840
brochure visual · Source S-F2-017
IDAS 2823 / REF
undated current generation · Source S-F2-017
The old year-to-model pairs follow the original brochure artwork rather than flattened PDF text.
Listen to a tiny spark
Several historical detector traditions converged into the DDX product families.
Robinson Model 5 (700 series)
retrospective HAEFELY Hipotronics brochure · Source S-F2-020
HAEFELY TE 560
retrospective brochure; attached slide 2 corroborates year · Source S-F2-020
Robinson 800 series / pulse discrimination
retrospective original brochure · Source S-F2-020
TETTEX 9120
retrospective original brochure · Source S-F2-020
HAEFELY TE 571 digital PD
retrospective brochure; not definitive delivery date · Source S-F2-020
Hipotronics/Robinson DDX digital
independent historical thesis says 1998; precise model unresolved · Source S-F2-028
DDX 9101
commercial release in maker retrospective chart · Source S-F2-020
DDX 9121b
initial DDX9121b family, suffix revision date may differ · Source S-F2-020
DDX 9121b site-location feature
feature release, not new original instrument · Source S-F2-020
DDX 9160 / 9161
undated official 11p brochure, publication date not same as first release · Source S-F2-018
Signed technical papers identify researchers, not exclusive inventors of each model.
Not just boxes.
Methods, papers,
engineers.
Independent research groups and R&D teams appear throughout this history. Signed publications verify scientific contributions — but not necessarily who designed every instrument or owned the original patent.
Meet the PD branches ↗