The Keysight E1505A is an 8-channel current source Signal Conditioning Plug-on (SCP) module designed for precision excitation in resistance and resistance-temperature measurements within VXI test systems. Each channel delivers independently programmable DC current at two selectable levels: 30 µA or 488 µA, with output accuracy of ±9 nA at the 30.518 µA level and ±60 nA at the 488.28 µA level (90-day specification at 23 °C ± 1 °C after 1 hour warm-up). Over-voltage protection is integrated on each channel to prevent damage from overcurrent or voltage transients.
The module incorporates two 150 Ω series resistors in each output path, which must be accounted for in measurement calculations. Four-wire resistance measurement configurations are supported and recommended for maximum accuracy; two-wire measurements are possible but introduce an offset error due to these internal series resistors.
## Technical Specifications
• Channels: 8 independent current sources
• Current Amplitude: Selectable 30 µA or 488 µA
• Output Accuracy (90-day, 23 °C ± 1 °C, post warm-up):
– 30.518 µA level: ±9 nA
– 488.28 µA level: ±60 nA
• Internal Series Resistance: Two 150 Ω resistors per channel
• Protection: Over-voltage protection on each channel
## Key Features
• Dual selectable current levels eliminate need for external current programming
• Four-wire measurement support for precision resistance characterization
• Channel-by-channel over-voltage protection
• Compact SCP form factor for VXI mainframe integration
## Typical Applications
• Resistance measurements via constant current excitation
• RTD and thermistor excitation for temperature sensing
• Component characterization requiring precise DC current sourcing
## Compatibility & Integration
Designed for VXI mainframe systems. Integrates with the E1413C (64-Channel Scanning A/D Converter), E1415A (Algorithmic Closed Loop Controller), E1419A (Multifunction Measurement and Control Module), and E1502A (8-Channel Low-Pass Filter SCP Module) for complete measurement chains.
