Keithley 61300 ERB-24 Relay Board I/O Rackmount Crydom D2425 SSR Corcom EMI

Keithley 61300 ERB-24 Relay Board I/O Rackmount Crydom D2425 SSR Corcom EMI

The Keithley 61300 is a 24-channel relay board I/O assembly (ERB-24) housed in a custom rackmount enclosure. The unit integrates a relay switching board (62200 / 9205/B), dual internal power supplies, a solid-state relay, and an EMI line filter into a self-contained control enclosure. The front panel features five labeled indicator lights — AC Power, Arc Power, CCD Shutter, Mask Vacuum, and Arc Lamp Shutter — along with a rocker power switch, suggesting original use in an optical or photolithography instrument control system.

Specifications & What's Included

• Keithley model: 61300, revision 9203/E
• Relay board: 62200 / 9205/B — 24-channel ERB-24
• Solid-state relay: Crydom D2425 — 240V AC output, 25A, 3–32V DC input
• EMI line filter: Corcom 10VK7 — 10A, 120/250V AC, 50–60Hz
• Internal power supply 1: ACDC Electronic PS 15N4.5 — 15V DC at 4.5A output
• Internal power supply 2: ACDC Electronic PS 5N9-1 — 5V DC at 9A output
• Front panel indicators: AC Power, Arc Power, CCD Shutter, Mask Vacuum, Arc Lamp Shutter (5 LEDs)
• Front panel: rocker power switch (illuminated)
• Rear panel: IEC C14 AC inlet (J1), standard AC duplex outlet (J2)
• Rear panel: multi-pin circular connectors J5, J6, J7, J8, J9, J10
• Rear panel: D-sub connector J4 (labeled PIO-12)
• Form factor: rackmount enclosure (approximately 4U–5U)
• Internal wiring: rainbow ribbon cable and discrete wiring harness throughout

Applications

The Keithley ERB-24 relay board series provides digital I/O and relay switching for automated test and instrument control systems. The front-panel labeling on this unit — CCD Shutter, Arc Lamp Shutter, Mask Vacuum, Arc Power — is characteristic of a photolithography or contact aligner control chassis, where the relay board sequences lamp, shutter, and vacuum functions during exposure cycles. This type of relay I/O enclosure is used in semiconductor processing, optical test benches, and laboratory automation setups that require isolated switching of AC and DC loads under computer or PLC control. The Crydom D2425 solid-state relay handles high-current AC switching (up to 25A at 240V) with DC logic-level control (3–32V), making it well suited for driving lamp or motor loads. Units of this type date from the 1980s–1990s era of laboratory instrument automation and are still found in legacy photolithography and research lab environments.