ESD Gun Calibration: Turnaround Times, On-Site Services & How It Works
Tra-Cal Lab has provided ISO/IEC 17025 accredited, NIST-traceable ESD gun calibration for over 35 years — trusted by NASA, the U.S. military, and NIST. We service every major brand, from Teseq and Haefely simulators to the wider EMC test market, with faster turnaround and lower cost than the OEM. We offer expedited services, on-site calibration and Mid-Atlantic pickup and delivery to keep your operation running. Every certificate includes as-found/as-left data, so your measurements stand up to any audit.
Key Summary
ESD Gun calibration verifies the discharge waveform against the IEC 61000-4-2 requirements using a NIST-traceable current target and high-bandwidth measurement chain — peak current, rise time, and the current values at 30 ns and 60 ns — at each set voltage in both contact and air-discharge modes, with results documented on a calibration certificate. Standard turnaround is 3-5 business days with overnight rush available, and most ESD guns should be calibrated every 12 months by an ISO/IEC 17025 accredited lab.
Why Choose Tra-Cal?
ISO/IEC 17025 Accredited
Our lab is independently audited every year by ANAB to the industry's most rigorous quality standard, so every calibration is audit-proof.
Overnight Rush Available
When downtime isn't an option, expedited service gets your instrument calibrated and back in your hands overnight or within three days.
NIST-Traceable
Every measurement we make traces directly back to national standards, giving your results documented accuracy you can defend.
Trusted by NASA, the U.S. Military, and NIST
The organizations with the most demanding measurement requirements in the country choose Tra-Cal — yours can too.
ESD Gun Calibration Turnaround
| Service | Turnaround |
|---|---|
| On-site Calibration Service | Same-Day |
| Standard calibration with certificate | 3-5 business days |
| ISO/IEC 17025 accredited calibration | 4-6 business days |
| Expedited / rush | Overnight to 3 days |
ESD Gun Brands & Models We Calibrate
| Manufacturer | Popular Models We Calibrate |
|---|---|
| Teseq | NSG 435 |
| Haefely | PESD 3000 |
Don’t see your model?
We support over 100 test equipment manufacturers — contact us and we’ll confirm coverage for your exact instrument.
Equipment & Standards Required
We maintain the following equipment and conditions required to calibrate an ESD gun accurately:
IEC 61000-4-2 compliant current target with NIST-traceable transfer impedance and at least a 4:1 test accuracy ratio
High-bandwidth oscilloscope (2 GHz or greater) with matched attenuator chain and characterised cabling
Calibrated high-voltage divider and electrostatic voltmeter for verifying set discharge voltage
Manufacturer’s calibration procedure and the applicable IEC 61000-4-2 waveform specifications
Stable environment: 23 °C ± 5 °C with relative humidity controlled within the standard’s limits, and NIST-traceable reference standards with a documentation system
How to Calibrate an ESD Gun: Step-by-Step
Step 1: Inspect the gun, tips, and return cable, then stabilize. Check the contact and air-discharge tips for pitting, inspect the return strap and HV cable for insulation damage, verify the correct discharge network module is fitted, and let the equipment acclimate at the specified temperature and humidity.
Step 2: Perform “as found” verification. Capture the discharge waveform at each set voltage and polarity before any adjustment. As-found data proves whether products previously immunity-tested with this gun actually saw a compliant stress.
Step 3: Verify the discharge waveform against IEC 61000-4-2. Discharge into the current target at each specified voltage in both polarities and record peak current, rise time, and the current at 30 ns and 60 ns, then confirm the set voltage itself against a calibrated divider or electrostatic voltmeter.
Step 4: Adjust, repair, or reject as required. Replace worn tips, relays, or discharge network modules and service the high-voltage supply where the design allows. Guns whose waveform remains outside the standard’s tolerance band are documented and returned as limited-use or rejected.
Step 5: Perform “as left” verification and issue documentation. Re-capture the full voltage and polarity set after any service and issue an ISO/IEC 17025 accredited certificate with as-found and as-left waveform data, measurement uncertainties, and NIST traceability.
Pro tip from our lab: Always request as-found/as-left data on your certificate. Without it, you can’t assess whether measurements taken before calibration were reliable — a common audit finding.
How Often Should You Calibrate an ESD Gun?
| Usage Profile | Recommended Interval | Notes |
|---|---|---|
| Daily industrial / field use | 6–12 months | Shorten after drift or overload events |
| General lab / bench use | 12 months | Industry-standard default |
| Regulated environments (ISO 9001, FDA, A2LA audits) | Per quality system, typically 12 months | Interval must be documented and justified |
ISO/IEC 17025 does not specify fixed calibration intervals. It requires that intervals be reviewed and adjusted as necessary to maintain confidence in the equipment. Recommended intervals are typically 6–12 months, adjusted based on documented risk assessment and historical stability data per the lab’s calibration program. A2LA and ANAB are accreditation bodies — distinct from quality-system frameworks such as ISO 9001 or FDA requirements.
Frequently Asked ESD Gun Questions
Q: How much does ESD gun calibration cost?
A: ESD Gun calibration cost depends on the number of discharge voltages and polarities verified, whether both contact and air-discharge tips are included, whether the discharge network modules (150 pF/330 Ω and any alternates) are submitted, and whether accredited (17025) certification is needed, and whether accredited (17025) certification is required. Contact Tra-Cal for a quote.
Q: Can I calibrate an ESD gun myself?
A: You can perform verification checks against a known reference, but formal calibration requires traceable standards with a 4:1 accuracy ratio and documented uncertainty.
Q: What is the difference between calibration and adjustment?
A: Calibration is the documented comparison against a standard; adjustment is the correction made when readings fall outside tolerance.
Q: How long does calibration take?
A: Standard turnaround is typically 3-5 business days; Tra-Cal offers expedited service options.