# Test & measurement instruments

Part ID: 11.05 · Layer 11 (Software, tools & services touching the hardware (optional))

Test and measurement instruments — oscilloscopes, network analyzers, power analyzers, and related gear — used to validate silicon, cabling, and power systems through build and commissioning.

Bringing up a data center and the compute inside it requires verifying that chips, boards, copper and optical links, and power systems actually perform to spec before they go into production — work done with oscilloscopes, network and protocol analyzers, power analyzers, and related bench and field instruments. This equipment touches nearly every other layer at some point in the build and validation cycle: signal integrity testing for the interconnect in Layer 3, power quality testing for the electrical chain in Layer 7, and functional test during server integration in Layer 4. Faster interconnect speeds and higher power densities push testing toward tighter tolerances and more specialized instruments, and qualification of new high-speed links or power topologies typically runs through a small set of established test-and-measurement vendors before it reaches volume production.

**AI delta:** Higher-speed interconnect and higher-density power systems in AI racks require tighter test tolerances and more specialized instruments than prior generations of data center hardware.

## Companies

| Company | Role | Confidence | Ownership | Ticker | Note |
|---|---|---|---|---|---|
| Anritsu | service | inferred | public | 6754.T |  |
| Chroma | service | inferred | public | 2360.TW |  |
| Emerson | service | inferred | public | EMR |  |
| Fortive | service | inferred | public | FTV |  |
| Hioki | service | inferred | public | 6866.T |  |
| Keysight | service | inferred | public | KEYS |  |
| Teradyne | service | inferred | public | TER |  |
| Viavi | service | inferred | public | VIAV |  |
| Yokogawa | service | inferred | public | 6841.T |  |
| EXFO | service | inferred | private |  |  |
| Rohde & Schwarz | service | inferred | private |  |  |

Confidence tags: disclosed = company/filing statement; reported = trade press or partner list; inferred = taxonomy lead.