Keysight / Agilent / HP E1508A 8-Channel Fixed Filter SCP Module

The Keysight E1508A is an 8-channel signal conditioning processor (SCP) module that delivers fixed-gain amplification and low-pass filtering for precision data acquisition. Each channel integrates a 2-pole low-pass filter with a 3 dB cutoff frequency of 7 Hz and a fixed gain of 16×, conditioning sensor signals across a 3.9 mV to 1 V full-scale input range. Built-in input over-voltage protection and open transducer detection safeguard measurement integrity across all channels. The module excels in low-frequency applications including temperature, resistance, and strain measurement when paired with compatible VXI scanning and control modules.

## Technical Specifications

• **Channels:** 8
• **Filter Type:** Fixed 2-pole low-pass
• **Filter Cutoff Frequency:** 7 Hz (3 dB)
• **Amplifier Gain:** 16×
• **Input Signal Range:** 3.9 mV to 1 V FS per channel
• **DC Volts Accuracy (with A/D filter ON, min sample period ≥145 µs, ≤100 Hz scan rate, 64 ch):**
– Linearity: 0.01% of reading
– Offset Error (3σ): Varies by range
– Noise (3σ): Varies by range

## Key Features

• Input over-voltage protection on all channels
• Open transducer detection (OTD) via diagnostic commands using small current injection
• Fixed gain design optimizes measurement resolution for low-level sensor signals
• 7 Hz cutoff frequency suited for quasi-static and low-frequency signal processing

## Typical Applications

• Temperature measurement with thermocouples, thermistors, and RTDs
• Resistance measurement paired with the E1505A 8-Channel Current Source SCP
• Strain measurement with enhanced accuracy due to onboard signal gain
• General low-frequency analog signal conditioning in data acquisition systems

## Compatibility & Integration

Designed for Keysight VXI mainframe integration with:

• E1413C 64-Channel Scanning A/D Converter
• E1415A Algorithmic Closed Loop Controller
• E1419A Multifunction Measurement and Control Module