Pressure-Chamber Probing: Plan Wafer-Level Sensor Characterization — working record
Yenra | October 3, 2026
https://yenra.com/pressure-chamber-probe/

Purpose: Specify a wafer-level pressure-sensor test brief with pressure reference, temperature, electrical stimulus and traceable result definitions.

Instructions: Make a working copy. Fill the fields below with actual evidence and units. Record unavailable information as unknown, give it an owner, and resolve it before using the record for acceptance. Keep raw evidence by reference. Use the approved method, equipment limits and acceptance rules for your application. This blank record does not establish qualification.

1. Device/wafer/die map; test purpose; reviewer
   Response / evidence reference: ______________________________

2. Pressure convention and units; sensor sides and reference connection
   Response / evidence reference: ______________________________

3. Approved equipment configuration, medium and procedure reference
   Response / evidence reference: ______________________________

4. Operating characterization / proof / destructive test scope
   Response / evidence reference: ______________________________

5. Pressure reference ID/calibration/uncertainty; achieved-value log
   Response / evidence reference: ______________________________

6. Temperature evidence/stability; electrical settings/contact checks
   Response / evidence reference: ______________________________

7. Sequence: pressure / direction / time / output / status; repeats
   Response / evidence reference: ______________________________

8. Offset and sensitivity definitions; nonlinearity reference; hysteresis denominator
   Response / evidence reference: ______________________________

9. Fictional check: 20 mV/bar; 2 mV = 2% of 100 mV span
   Response / evidence reference: ______________________________

10. Sample/exclusion record; unresolved issues; qualified scope
   Response / evidence reference: ______________________________

Teaching example (fictional; not acceptance criteria):
Fictional sensor calculation A sensor output rises from 10 mV at 0 bar gauge to 110 mV at 5 bar gauge. Endpoint sensitivity over that interval is (110 − 10)/5 = 20 mV/bar. At 2.5 bar gauge, the ascending and descending readings are 59 mV and 61 mV. Their 2 mV difference is 2% of the 100 mV output span. That is the directional difference at this point; determining maximum hysteresis requires all matched points. These values are fictional and establish no sensor acceptance limit.

Primary source context (consult for applicable method and scope):
WIKA's explanation of pressure references
https://blog.wika.com/us/products/pressure-products/absolute-pressure-gauges-advantages/
FormFactor's vacuum and pressure system overview
https://www.formfactor.com/products/probe-systems/
WIKA pressure-measurement handbook
https://www.wika.com/media/Brochures-and-flyers/EN-UM/br_rfhandbook_en_um.pdf

Review outcome: accepted / held / further evidence needed
Reviewer and date: __________________
Open actions, owner and due date: __________________