Overview
This process control record treats Thick Film Resistor Printing and Firing as a controlled release sequence rather than a machine-list claim. It connects incoming inputs, process variables, inspection points, exceptions, and traceability to the failure each control prevents.
Control sequence
The order makes assumptions and ownership visible before a result is promoted to a requirement.
- 01
Release the input revision
For Thick Film Resistor Printing and Firing, close remaining assumptions and link the quoted or released scope to the drawing revision, evidence set, owner, and change-control plan.
- 02
Confirm materials and tooling
For Thick Film Resistor Printing and Firing, document the functional requirement, operating boundary, interfaces, quantities, and acceptance owner against the current drawing.
- 03
Control the process window
For Thick Film Resistor Printing and Firing, complete control the process window against the controlled drawing, named assumptions, responsible owner, required evidence, and release decision.
- 04
Measure the critical output
For Thick Film Resistor Printing and Firing, agree the inspection method, sample plan, acceptance criteria, traceability, and report format before validation.
- 05
Record exceptions and disposition
For Thick Film Resistor Printing and Firing, complete record exceptions and disposition against the controlled drawing, named assumptions, responsible owner, required evidence, and release decision.
Engineering review matrix
Each row links a design variable to evidence that can support a drawing or release decision.
| Variable | Control question | Verification route |
|---|---|---|
| Nominal function | For Thick Film Resistor Printing and Firing, resistance, ratio, tolerance, TCR, voltage, power, pulse, and stability need a defined reference condition. | Measure value and ratio with stated probe geometry, temperature, dwell, and instrument conditions. |
| Geometry and sheet resistance | Paste sheet resistance and effective length-to-width set first-order value; corners and terminations disturb the ideal square model. | Correlate released artwork and processed-film measurements with actual resistance distribution. |
| Termination effects | Conductor overlap, current crowding, contact resistance, aspect ratio, and refire interactions can dominate short geometries. | Use Kelvin or controlled probing where termination resistance is material. |
| Loading and temperature | Power density, substrate spreading, terminal cooling, voltage coefficient, ambient, and duty determine self-heating and drift. | Verify resistance change and temperature field at the intended electrical and thermal boundary. |
| Trim and protection | Trim allowance, cut shape, measurement loop, stability margin, overglaze, and post-trim processing form one sequence. | Record pre-trim, target, post-trim, post-protection, and stability results against the released lot. |
Failure controls
These are review prompts, not evidence that every risk applies or that every test is available.
- A
Value offset from geometry, thickness, firing, or termination interaction
- B
Local overheating and irreversible drift under load
- C
Trim-cut stress, current crowding, or inadequate stability margin
- D
Noise, voltage-coefficient error, humidity drift, or ratio mismatch
Inputs for a practical review
Unknown values may be labelled unknown. The review should convert uncertainty into an explicit decision or validation task.
Send Drawings- 01
Nominal resistance or ratio and complete tolerance budget
- 02
TCR, voltage, power, pulse, duty, and temperature range
- 03
Artwork, resistor dimensions, terminals, and trim keep-outs
- 04
Probe method, reference temperature, and acceptance method
- 05
Protection, environment, stability, and reliability profile