generated: '2026-08-01'
method: searched
source: https://www.hyperlabs.com/api/v1/software (resources[] -> published *_changelog.txt)
notes: >-
  HYPERLABS publishes no changelog for its web API. It does publish a dated, per-release changelog as a
  plain-text file attached to each instrument-software product, reachable from the software pages and
  from the public software catalog endpoint. Scheme is semantic-ish MAJOR.MINOR.PATCH with US-format
  dates, and entries are classed with explicit FEATURE / IMPROVEMENT / CHANGE / BUGFIX / INTERFACE /
  TUNING / DEPRECATION prefixes. Recent window only — the published files are the source of truth.
scheme: semver-like
date_format: MM/DD/YY
entry_classes: [FEATURE, IMPROVEMENT, CHANGE, INTERFACE, TUNING, BUGFIX, DEPRECATION]
products:
- product: XTDR
  docs: https://www.hyperlabs.com/software/
  changelog: https://hyperlabsstprodcus.blob.core.windows.net/hyperlabs/08deec8d-f3a7-4ceb-8898-4303e4d7eae1/XTDR_changelog.txt
  current_version: 2.8.0
  entries:
  - version: 2.8.0
    date: '2020-09-03'
    breaking: false
    highlights: [BUGFIX amplitude calibration distortion on channel pairs with divergent steps]
  - version: 2.7.0
    date: '2019-05-20'
    breaking: false
    highlights: [BUGFIX prevent software from loading settings for a different instrument model]
  - version: 2.6.0
    date: '2016-06-09'
    breaking: false
    highlights: [BUGFIX eliminated dribble-up of first points during TDR waveform averaging]
  - version: 2.5.0
    date: '2015-10-12'
    breaking: true
    highlights:
    - IMPROVEMENT multithreaded acquisition for a more responsive UI
    - FEATURE LED-style indicator for active acquisition/calibration
    - DEPRECATION auto-calibration toggle removed - multithreading removes the need to disable it
  - version: 2.0.5
    date: '2015-07-31'
    breaking: false
    highlights:
    - FEATURE insertion loss (S21) and return loss (S11) measurement modes
    - CHANGE data logging (CSV, PNG, print) moved to the File menu
- product: Zcoupon
  docs: https://www.hyperlabs.com/software/
  changelog: https://hyperlabsstprodcus.blob.core.windows.net/hyperlabs/08deec8e-2811-48b9-8a9a-aa3bdeeee1fa/Zcoupon_changelog.txt
  current_version: 2.7.1
  entries:
  - version: 2.7.0
    date: '2020-03-14'
    breaking: false
    highlights: [IMPROVEMENT external calibration now performed against external load resistors on the HL9600 Calibration Standards Substrate]
  - version: 2.6.0
    date: '2018-12-17'
    breaking: true
    highlights:
    - FEATURE improved external calibration using HL9600 Calibration Standard Substrate coupons
    - DEPRECATION support deprecated for HYPERLABS HL52xx Series instruments
  - version: 2.5.0
    date: '2016-03-25'
    breaking: false
    highlights:
    - FEATURE multiple boards may share the same Session ID
    - FEATURE LOG button auto-saves X/Y points to CSV
    - FEATURE new coupon definition parameters - trace width and spacing
  - version: 2.0.0
    date: '2015-10-23'
    breaking: false
    highlights:
    - FEATURE software multithreading
    - FEATURE external calibration to a calibration standard substrate
    - FEATURE automatic Word session report on session close
- product: ZTDR
  docs: https://www.hyperlabs.com/software/ztdr/
  changelog: https://hyperlabsstprodcus.blob.core.windows.net/hyperlabs/08deec8e-8088-49e7-812e-cf763321ea5b/ZTDR_changelog.txt
  current_version: 2.1.0
  changelog_covers_through: 2.0.5
  entries:
  - version: 2.0.5
    date: '2016-07-11'
    breaking: false
    highlights:
    - CHANGE improved debug and error codes for startup errors
    - BUGFIX intermittent error initializing device at startup
  - version: 2.0.1
    date: '2015-10-28'
    breaking: true
    highlights:
    - FEATURE multithreading support for acquisition and UI
    - CHANGE option to disable auto-calibration removed
    - CHANGE CLEAR button for stored waveform removed - now File menu only
    - CHANGE Data menu consolidated into File menu
  - version: 1.1.0
    date: '2014-09-30'
    breaking: false
    highlights:
    - FEATURE set horizontal reference (zero) on demand
    - FEATURE save/load program settings, remember environment across restarts
- product: TDR11100
  docs: https://www.hyperlabs.com/software/tdr11100/
  current_version: 1.0.0
  changelog: null
  notes: Initial release; no changelog file published yet.
x-evidence:
  fetched: '2026-08-01'
  sources:
  - {url: 'https://hyperlabsstprodcus.blob.core.windows.net/hyperlabs/08deec8d-f3a7-4ceb-8898-4303e4d7eae1/XTDR_changelog.txt', http_status: 200}
  - {url: 'https://hyperlabsstprodcus.blob.core.windows.net/hyperlabs/08deec8e-2811-48b9-8a9a-aa3bdeeee1fa/Zcoupon_changelog.txt', http_status: 200}
  - {url: 'https://hyperlabsstprodcus.blob.core.windows.net/hyperlabs/08deec8e-8088-49e7-812e-cf763321ea5b/ZTDR_changelog.txt', http_status: 200}