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.
