FIELD NOTES
Get better at hardware test.
Guides, tutorials, and best practices to help you build better hardware tests.
- Compliance & Traceability
Data Sovereignty for Manufacturing Test Data
Learn why test data jurisdiction matters for manufacturing companies and how to protect process parameters and yield data from foreign surveillance laws.
- Quality & Process Control
What Is Pp (Overall Process Performance)
Pp measures long-term process spread relative to spec width using overall standard deviation. Learn the formula, compare Pp to Cp, and track it in TofuPilot.
- Quality & Process Control
What Is Ppk (Process Performance Index)
Ppk measures long-term process performance using overall standard deviation. Learn how it differs from Cpk and how TofuPilot tracks both.
- Quality & Process Control
What Is Cp (Potential Process Capability)
Cp measures how much of the spec window your process variation uses, ignoring centering. Learn the formula, how Cp relates to Cpk, and read it in TofuPilot.
- Quality & Process Control
What Is Cpk (Process Capability Index)
Cpk measures whether your process produces units within spec limits, accounting for centering. Learn the formula, thresholds, and how TofuPilot tracks it.
- Quality & Process Control
What Is SPC (Statistical Process Control)
SPC uses production test data to separate normal variation from real problems. Learn the core tools, how they connect, and how TofuPilot automates SPC.
- Getting Started
How to Write a Hardware Test Plan
A hardware test plan defines what to test, when, and how. Learn how to structure a test plan and implement it in Python with TofuPilot.
- Quality & Process Control
What Is IQC, IPQC, FQC, and OQC
IQC, IPQC, FQC, and OQC are the four quality gates in manufacturing. Learn what each catches, how AQL sampling works, and how to track yield per gate.
- Scaling & Monitoring
Track Equipment Calibration
Validate instrument calibration status before every test run. Track calibration dates as metadata and catch expired calibrations before they corrupt your data.
- Test Station Setup
What Is an Operator Interface
An operator interface lets production floor workers run tests without writing code. Learn what it includes, how it compares across frameworks, and how to.
- Instrument Control
Automate a Rigol Power Supply
Control a Rigol DP800 series power supply from Python using PyVISA, with multi-channel control, OVP/OCP protection, and TofuPilot integration via OpenHTF.
- Getting Started
Add Measurements with Limits
A complete reference for OpenHTF measurement types, validators, and units, with code examples for numeric ranges, exact matches, percentages, and marginal.
