FIELD NOTES
Get better at hardware test.
Guides, tutorials, and best practices to help you build better hardware tests.
- Quality & Process Control
Why Is My Yield Dropping?
Nothing changed in the design but boards started failing. A practical method for finding the cause using test data you already have, or should be recording.
- Quality & Process Control
Setting Alert Thresholds That Actually Work
Why a fixed yield threshold fails on real production lines, and how a self-calibrating EWMA detector finds the right band for each one.
- Quality & Process Control
What Is a Histogram in Manufacturing Test
A histogram shows the distribution shape of your measurement data. Learn how to read histogram patterns, spot problems, and use them for SPC in TofuPilot.
- Quality & Process Control
Cpk vs Ppk: What's the Difference
Cpk and Ppk both measure process capability, but use different standard deviations. Learn when to use each, what the gap reveals, and compare them in TofuPilot.
- Quality & Process Control
What Is Ppl and Ppu (One-Sided Performance)
Ppl and Ppu measure long-term process performance against individual spec limits. Learn the formulas, how they relate to Cpl/Cpu, and track them in TofuPilot.
- Quality & Process Control
What Is Cpl and Cpu (One-Sided Capability)
Cpl and Cpu measure process capability against individual spec limits. Learn the formulas, when to use one-sided indices, and how TofuPilot displays them.
- 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.
- 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.
