Agilent / Keysight E1344A 16-Channel T/C High-Voltage Relay Multiplexer

The Keysight E1344A is a B-size, 1-slot VXI register-based multiplexer module engineered for high-voltage thermocouple measurements. It switches 16 channels of high, low, and guard signals to a compatible DMM, enabling multi-point temperature acquisition with automatic cold junction compensation. The module handles DC and AC voltages up to 250 V with channel currents to 50 mA, delivering thermal measurement accuracy within 10 µV differential offset per channel.

Technical Specifications

• Maximum voltage (DC): 250 Vdc (any terminal to any other or chassis)


• Maximum voltage (AC rms): 250 V rms (any terminal to any other or chassis)


• Maximum current per channel (non-inductive): 50 mA


• Maximum power per channel: 1 VA


• Maximum thermal offset (differential Hi-Lo): 10 µV


• Closed channel resistance: 100 Ω ± 10%


• Channel configuration: 16-channel switching (high, low, guard)


• Form factor: B-size, 1-slot VXI module

Key Features

• Thermocouple-compensated relay switching for 16 independent channels


• Automatic cold junction compensation for standard thermocouple types


• Register-based control via SCPI commands


• Includes one analog bus cable for mainframe connectivity


• Closed channel resistance of 100 Ω ± 10% ensures signal integrity


• Thermal offset specification of 10 µV minimizes measurement error in precision applications

Typical Applications Multi-point thermocouple temperature monitoring across industrial, laboratory, and environmental test environments. Channel scanning with automatic type conversion for diverse thermocouple inputs. Integration with VXI-based measurement systems requiring synchronized voltage, current, or resistance measurements alongside temperature data.

Compatibility & Integration Operates with Agilent E1326B or E1411B DMMs. For B-size mainframes (E1300B, E1301B), connect via the analog bus cable supplied with the E1326B DMM. C-size mainframes require the E1403C active adapter. The module ships with one analog bus cable for direct slot-adjacent module connection.