The Keysight/Agilent/HP E3243A Microphone/Voltage Breakout Box is a four-channel signal conditioning accessory that interfaces microphones, voltage signals, and IEPE transducers with the E1432A and E1433A VXI modules. The unit consolidates multiple transducer input types—including 7-pin LEMO connectors for microphones and female BNC connectors for voltage and IEPE sources—into a single interface, eliminating the need for separate conditioning equipment. Each channel incorporates programmable signal conditioning with selectable microphone gain, polarization voltage control (0 V or 200 V DC), and switchable 4 mA constant current supply for IEPE accelerometers. Buffered monitor outputs on each channel deliver up to 5 V peak with 1 kΩ output impedance, enabling real-time signal observation. The E3243A connects to the VXI module via a 2-meter cable terminated with Amp connectors, with an optional 20-meter extension available.
## Technical Specifications
• **Input Channels:** 4
• **Input Connectors:** 7-pin LEMO (microphones), female BNC (voltage/IEPE)
• **Output:** Single 26-pin Amp 750823-1 connector to VXI module
• **Monitor Output:** One female BNC per channel, buffered, 5 V peak maximum, 1 kΩ output impedance
• **Polarization Voltage (Microphone):** Programmable 0 V or 200 V DC
• **IEPE Power Supply:** 4 mA constant current, software switchable with indicator light
• **Microphone Input:** AC-coupled with programmable gain settings; low-frequency coupling to minimize phase errors
• **Float/Ground Control:** Program-selectable per channel for differential or single-ended operation
• **Input Noise:** Less than 20 nV/√Hz (referenced to input, 20 Hz to 88 kHz, 50 Ω termination)
• **A-Weighted Noise Floor:** Less than 8 dB SPL with 50 mV/Pa microphone
• **Channel-to-Channel Crosstalk:** Less than −80 dBfs at 20 kHz (50 Ω termination)
• **Frequency Response:** 20 Hz to 88 kHz
• **Cable:** 2-meter Amp 750833-1 terminated cable included; 20-meter extension available (Option AFL)
## Key Features
• Integrated conditioning for acoustic and mechanical measurements
• Microphone pre-amplifier with three programmable gain levels
• Independent channel control for polarization, IEPE power, and input impedance
• Low-noise design suitable for low-level microphone acquisition
• High channel isolation (−80 dBfs) for multi-channel recording
## Typical Applications
• Acoustic and vibration analysis
• Audio signal acquisition
• General-purpose voltage measurement with transducers
• IEPE accelerometer data collection
## Compatibility & Integration
Designed exclusively for Keysight E1432A and E1433A VXI modules.
