How to Build a Compliance Verification Plan for S20.20
The Compliance Verification Plan (CVP) is the backbone of an audit-ready ESD program under ANSI/ESD S20.20. This guide shows which items to test, which limit values apply and how often you must verify them.
View test equipmentWhat is a Compliance Verification Plan?
A Compliance Verification Plan (CVP) is the documented test schedule that proves your ESD controls stay within their limit values over time. ANSI/ESD S20.20 explicitly requires this plan as part of the ESD control program.
The plan defines which technical elements are tested, with what they are measured, against which limit values and at which interval. The readings are recorded and form the evidence chain for S20.20 audits or customer audits.
- Test item: what is measured (wrist strap, floor, mat, ionizer).
- Test instrument: what it is measured with (resistance meter, field meter, CPM).
- Limit value: the permitted range per S20.20 and TR53.
- Frequency: how often (daily, monthly, annually).
- Responsibility and record: who tests and where it is logged.
Which test items and limits belong in the plan?
The CVP covers every grounded and dissipative element of the EPA. The governing figure is the upper limit for personnel grounding of less than 1×10⁹ Ω to ground, plus the product-specific values for floors, seating and ionization.
- Wrist strap: system of band, cord and 1 MΩ resistor, measured as person plus strap.
- Dissipative floor: measured as the floor-footwear-person system (RTG).
- Ionization: decay time and offset voltage (balance) at the charged plate monitor.
- Ground points and bonds: continuity to the common ground bus.
How often do you have to test?
Test frequency follows the risk and wear of each item. Wear parts such as wrist straps are tested daily, fixed installations far less often. What matters is that you justify the chosen intervals in the CVP and then keep to them.
The instruments themselves must be calibrated: resistance meters and charged plate monitors usually once a year, traceable to a national standard. Without valid calibration, your readings are worthless in an audit.
Frequently asked questions
Is a Compliance Verification Plan mandatory under S20.20?
Yes. ANSI/ESD S20.20 requires a documented verification plan as a fixed part of the ESD control program. Certification is not possible without one.
Where are the exact limits and test methods defined?
The limit values are given in S20.20, while the field test methods are described in the ESD TR53 technical report series. Your plan references both and fixes the concrete values for your site.
How often must a wrist strap be tested?
Daily, or at the start of each shift, with a wrist strap tester, or continuously via a constant monitor. The limit is below 3.5×10⁷ Ω for the whole system.
Do the instruments need calibration?
Yes, with traceable calibration, usually annual. Uncalibrated instruments make your readings invalid in an audit.
Looking for test equipment for your CVP?
We supply wrist strap testers, resistance meters, charged plate monitors and continuous monitors - everything for verification to ANSI/ESD S20.20.
To S20.20
Test instruments matched to the standard's limits.
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Readings that are documentable and traceable.
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Instruments with traceable calibration.
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