Schaffner NSG 500A — Used Automotive EMC Transient Generator (Teseq / AMETEK)

Schaffner · NSG 500 Series · ISO 7637-2 Transient Simulator · Used / Tested

The Schaffner NSG 500A is a benchtop transient / interference generator built for conducted immunity testing of automotive electronic modules. Originally released by Schaffner (now part of the Teseq / AMETEK EMC test instrument family), the NSG 500A generates the full ISO 7637-2 pulse set — pulse 1, 2, 3a, 3b, 4, 5a and 5b — and is widely used in 12 V / 24 V vehicle electrical system validation. This unit is sold as used, inspected, and function-tested: a cost-effective option for labs that need a proven ISO 7637 generator without paying new-instrument list price. For inquiries and current stock, email Moritta@KOEED.COM.

Key Technical Specifications & Overview

The NSG 500A is a self-contained pulse generator: connect the device-under-test (DUT) supply, pick a pulse number on the front panel, set the amplitude / source impedance, and trigger. It is designed to be paired with a Schaffner / Teseq coupling network (such as the CDN series) and an oscilloscope for waveform capture. Below is the typical published specification set for the NSG 500A.

Schaffner’s EMC test instrument line (NSG 500, NSG 5000, NSG 5500, CDN, CCL, INA series) is now sold and serviced under the Teseq brand, which itself is part of AMETEK Compliance Test Solutions. Spare parts and older generation units such as the NSG 500A remain widely deployed in automotive Tier 1 and Tier 2 supplier labs. See the broader EMC test equipment catalog for related transient generators, ESD simulators, and coupling networks.

Application Scenarios — Where the NSG 500A Fits

ISO 7637-2 transient immunity is a baseline requirement for almost every electronic control unit that ships in a passenger car, truck, off-highway vehicle, or two-wheeler with a 12 V / 24 V electrical system. The NSG 500A is the right tool when an engineering team needs a repeatable, standards-based pulse source for bench-level pre-compliance work. Typical deployments include:

• Validation labs at automotive Tier 1 suppliers (body control modules, instrument clusters, BCMs, gateways)
• ECU development teams that need a daily-usage pulse source for design regression and supplier-sample checks
• Sensor and actuator manufacturers (pedal sensors, throttle position, EGR, oxygen sensors, pressure sensors)
• Infotainment, telematics, and ADAS controller makers verifying conducted-immunity behaviour on the supply rail
• Commercial vehicle and off-highway equipment (construction, agricultural, material handling) electrical system checks
• University teaching labs and research benches that need a low-cost ISO 7637 transient source for student projects
• Used-car / EV converter refurbishers that need to re-validate 12 V / 24 V subsystems after repair

The NSG 500A also pairs naturally with general industrial-automation test benches: even though the standard is automotive, the pulse shape is sometimes re-used as a generic stress source for Allen-Bradley controller power supplies, Siemens SIMATIC supply inputs, Mitsubishi MELSEC I/O backplanes, Omron SYSMAC power rails, Fanuc CNC servo supply feeds, Schneider Modicon power inputs, Yaskawa Σ-7 servo supply, and Panasonic FP-series PLC power, plus KEYENCE vision system power-distribution blocks that ride on the same 24 V rail. Browse all nine brand collections via the Brands index.

Integration & Wiring Notes

The NSG 500A is a stand-alone bench instrument. It does not require a PC or software stack to operate — all pulse selection, amplitude setting, and trigger are done from the front panel. Wiring is straightforward but must follow the ISO 7637-2 injection topology to produce a meaningful result:

• DUT supply path: the NSG 500A feeds the DUT supply rail (12 V or 24 V nominal) through the pulse-injection network. Use the original Schaffner / Teseq interconnect cables and keep the loop short.
• Reference ground: bond the NSG 500A chassis ground, the oscilloscope ground, the DUT enclosure, and the bench ground stud to a single low-impedance star ground. Floating grounds corrupt the pulse shape and can mask DUT failures.
• Coupling network (CDN): for pulses 1, 2, 3a / 3b, the standard coupling is series injection on the supply line. Use a CDN that matches the DUT supply rating. If you do not have a CDN, the NSG 500A also supports direct injection on simple two-wire supplies.
• Load dump (pulse 5a / 5b): pulse 5 requires the alternator-decoupling network described in ISO 7637-2; a CDN alone is not sufficient. The NSG 500A will trigger the suppressor profile externally.
• Oscilloscope: a 200 MHz or higher scope with differential probe is recommended for waveform capture on the DUT terminals. The PLC Hex to Float Converter tool can also help post-process captured scope data exported in CSV.
• Triggering and synchronization: trigger the NSG 500A and the scope from the same event, or use the scope’s normal-trigger hold-off to capture single-shot transients cleanly. Free-running capture will miss most pulse 1 / pulse 2 events.
• Safety: pulse 5a is a high-energy transient. Keep the DUT inside an interlocked enclosure and verify that the suppressor on the alternator simulator is properly clamped before the next test run.

When integrating the NSG 500A into a wider lab workflow, it is worth keeping the pulse-injection rig separate from your PLC test rigs and CNC machine acceptance benches. EMC stress events can leak back into neighbouring test equipment via shared power strips, so a dedicated mains feed is recommended. Engineers migrating from manual pulse-by-pulse test execution to automated regression can use the Modbus CRC Calculator and PLC Error Code Database to streamline related test automation.

Installation & Commissioning Tips

Because this unit is sold as used, a short commissioning pass is strongly recommended before relying on it for certification testing. The goal is not to recalibrate to factory level (that is a separate accredited service), but to verify the unit is electrically healthy and produces the expected pulse shapes.

1. Visual and mechanical inspection. Check the front-panel keypad, the BNC outputs, the high-current banana jacks, and the mains inlet for signs of damage. Used units may have rack-mount ears fitted by a previous owner; remove them if you need bench-top access.
2. Self-test run. Power the NSG 500A from a clean mains feed (separate from your DUT supply) and run the built-in self-test or a low-amplitude pulse 3a burst into a 50 Ω termination. The output should be a clean damped ringing transient.
3. Verify pulse shape. Capture pulse 1, 2, 3a, 3b, 4, 5a, 5b at the rated source impedance and confirm rise time, pulse width, and amplitude against the ISO 7637-2 reference figures. Document the waveforms in your test report.
4. Calibration history. Ask KOEED for any prior calibration certificate, and budget for a fresh accredited calibration if the unit will be used for type approval. Used EMC instruments may have older calibration dates; a re-cal at a Teseq / AMETEK service centre is a normal step.
5. Ambient and grounding. Use the NSG 500A on a non-conductive bench surface in a temperature-controlled lab. Avoid carpet and keep relative humidity in the 30–70 % range to prevent static damage to the front-panel connectors.
6. Spare consumables. Keep spare fuses, BNC cables, and a CDN repair kit on hand. The 50 Ω feed-through terminations in particular wear out faster than people expect.
7. Documentation pack. If you intend to submit test reports to an OEM customer, keep a copy of the operating manual, the prior calibration certificate, and your commissioning waveform captures filed with the unit serial number.

New to ISO 7637 testing? The KOEED AI Diagnostic Tool can help you sketch out a first test plan from your DUT description, and the PLC Analog Calculator is useful for translating scope-captured voltage values into the engineering units your customer expects to see in the report.

Procurement, Warranty & Lead Time

KOEED is an independent multi-brand industrial-automation sourcing company, not an authorised Schaffner / Teseq subsidiary. We supply this NSG 500A as a used, inspected, function-tested unit with honest condition disclosure. Procurement terms:

• Condition: used, fully functional, with documented power-on and pulse-output check before shipment.
• Warranty: 30-day functional warranty on the main generator board (does not cover calibration drift, cosmetic wear, or user-induced damage such as mis-wired CDN connections).
• Calibration: any prior calibration certificate is supplied if available. New accredited calibration can be quoted as a separate line item through a third-party lab.
• Lead time: typically 3–7 business days for in-stock units, plus transit time. Out-of-stock items are sourced on request against a confirmed purchase order.
• Worldwide shipping: DHL / FedEx / UPS with full export documentation, including commercial invoice, packing list, and HS code declaration.
• Payment: standard B2B terms — wire transfer (T/T) for new customers, with credit terms negotiable after the first order.
• BOM quoting: if you also need a CDN, oscilloscope probes, a suppressor network, or a replacement 50 Ω load, send the full list and we will quote the lot.

To request a quote, send the part number (NSG 500A), quantity, and your shipping country to Moritta@KOEED.COM using the subject line RFQ — Schaffner NSG 500A. We will reply within 24 business hours with availability, lead time, and a quote. You can also submit a structured BOM via the Create a Quote form, or review our recent shipment examples on the Real-Time Records page. For questions about KOEED’s supply chain and QC process, see About KOEED and About China Sourcing Company. The latest EMC-instrument industry notes are published on Daily PLC News. For any other question, the Contact Us page lists all channels; email Moritta@KOEED.COM remains the fastest path to a live quote.