Keysight / Agilent / HP 34970-66504 DMM Card

The Keysight 34970-66504 is a plug-in DMM card that transforms the 34970A and 34972A Data Acquisition/Switch Units into precision measurement platforms. This module integrates a 6½-digit measurement engine capable of capturing DC/AC voltage and current, 2-wire and 4-wire resistance, temperature via thermocouples/RTDs/thermistors, frequency, and period measurements across 11 distinct signal types. With 0.004% basic DC voltage accuracy and scan rates up to 250 channels/second, the card delivers lab-grade performance within a compact modular form factor. Non-volatile memory stores 50,000 readings on-board.

Technical Specifications

Resolution: 6½ digits (22-bit)

DC Voltage Accuracy: 0.004% basic

AC Voltage Accuracy: 0.06% basic

Resistance Accuracy: 0.01% basic

DC Voltage Range: Microvolts to 300 V

DC Current Range: 1 µA minimum

AC Current Range: 100 µA minimum

Resistance Range: Up to 1000 MΩ

Scan Rate: Up to 250 channels/second

Storage Capacity: 50,000 readings (non-volatile)

Key Features

Measures DC/AC voltage, DC/AC current, 2-wire and 4-wire resistance

Temperature measurement support for thermocouples, RTDs, and thermistors

Built-in thermocouple reference junction for enhanced accuracy

Frequency and period measurement functions

11 different input signals measurable by internal DMM

Signal conditioning included - eliminates external accessory dependencies for standard measurements

Typical Applications Data logging, multichannel acquisition, automated test systems, temperature monitoring, resistance measurement in production environments, and frequency characterization where integrated switching and measurement are required.

Compatibility & Integration The 34970-66504 is a dedicated plug-in module for Keysight 34970A and 34972A mainframes. The 34970A offers GPIB and RS-232 connectivity; the 34972A provides Gigabit Ethernet (LAN) and USB 2.0. The mainframe accommodates up to three modules total.