Keysight / Agilent / HP 9100-4715 Transformer for 3458A Multimeter

The Keysight/Agilent/HP 9100-4715 is a replacement power transformer engineered for the 3458A Digital Multimeter. This E-core transformer delivers essential voltage conversion and isolation required to maintain the precision measurement integrity of the 3458A platform. Dual shielding and an integrated guarding cage minimize mains noise coupling, establishing clean, isolated power domains that protect sensitive analog circuitry from electromagnetic interference. The transformer mounts on a sturdy metal chassis frame positioned behind the front panel and VFD display, away from analog signal paths. This strategic placement ensures optimal isolation from high-frequency switching noise and field disturbances that could degrade multimeter accuracy.

## Technical Specifications

• **Manufacturer Part Number:** 9100-4715
• **Transformer Type:** E-core, custom manufactured
• **Shielding Architecture:** Dual shielding with guarding cage
• **Primary Function:** Voltage conversion and power isolation for 3458A multimeters
• **Mounting Configuration:** Metal chassis frame mounting, positioned behind front panel assembly

## Key Features

• Dual-shielded construction minimizes mains noise ingress into low-level analog measurement circuits
• Guarding cage provides additional electromagnetic isolation and defines separate power domains
• E-core design optimizes efficiency while reducing core losses
• Custom wound to OEM specifications for 3458A electrical requirements
• Strategic mounting location isolates transformer from sensitive front-end components

## Typical Applications

• Replacement component for aging or damaged 3458A multimeters
• Restoration of precision measurement capability in field instruments
• Power integrity enhancement in systems requiring submicrovolt-level measurement resolution

## Compatibility & Integration

This transformer is a direct replacement component for Keysight/Agilent/HP 3458A Digital Multimeters. It integrates into the existing power distribution architecture without modification to instrument circuitry or mechanical structure.