The Agilent/Keysight 70138A is a dual-channel vector voltmeter module for the 70000 Modular Measurement System (MMS). This high-sensitivity receiver measures CW signals, voltage magnitude, phase angle, and ratio data between two input channels. The module supports transmission and reflection measurements, network analysis procedures, and impedance/phase matching—making it suitable for RF assembly design, manufacturing, and field service. Now obsolete, limited self-support resources may remain available through Keysight.
Technical Specifications
The 70138A operates in two configurable input modes:
• High Impedance Probe Configuration: Two high impedance probe inputs; 100 kHz to 1 GHz frequency range
• Type-N Connector Configuration: Two 50-ohm Type-N inputs; 300 kHz to 2 GHz frequency range
Measurement outputs include normalized magnitude and phase angle, real and imaginary signal components, and voltage or power in linear or logarithmic units.
– Key Features
• Dual-channel CW signal measurement with phase difference detection
• Ratio measurements between input channels
• Built-in network analysis and transmission/reflection measurement procedures
• Impedance and phase matching capability
• In-device probing for localized DUT measurements
• Front-panel HP-IB interface with LED status indicators
• Configurable input modules for probe or connector-based coupling
– Typical Applications
Vector voltmeter measurements in RF component characterization, power amplifier phase analysis, impedance matching verification, and simple network analysis within manufacturing test stations and field service environments.
– Compatibility & Integration
Designed as a 70000 MMS plug-in module. Compatible with any external CW signal source, including 70000 MMS integrated sources, standalone tracking generators, and sources embedded in the device under test. Operates via HP-IB control within the modular measurement system chassis.
