The Keysight/Agilent/HP 44472A is a dual 1×4 VHF multiplexer module that routes and switches signals across two independent, electrically isolated channel groups. Each group features bi-directional 1×4 switching capability with 50 Ohm characteristic impedance, operating from DC to 300 MHz while maintaining low crosstalk and minimal signal distortion.
This module excels in precision measurement applications demanding high signal integrity. Insertion loss remains under 0.5 dB at 30 MHz and below 1.25 dB at 300 MHz. Within-group crosstalk reaches −100 dB at 30 MHz, degrading to −85 dB at higher frequencies. Group-to-group isolation is maintained at −85 dB (30 MHz), −65 dB (100 MHz), and −50 dB (300 MHz). VSWR performance stays below 1.43 across the operating range.
Voltage handling includes 250 V DC or 30 V AC RMS (42 V AC peak) center-to-center, with 42 V DC maximum center-to-low. Current per channel is rated at 30 mA DC or 300 mA AC RMS. Thermal offset remains below 15 µV, while closed-channel resistance is under 1 Ohm. DC isolation exceeds 10⁷ Ohms at controlled humidity conditions.
Signal integrity specifications include rise time under 0.7 nsec and propagation delay under 2.5 nsec, with channel-to-channel matching better than 90 psec. Capacitive parasitics are tightly controlled: center-to-center below 0.002 pF and center-to-low under 70 pF.
Technical Specifications
• Frequency Range: DC to 300 MHz
• Characteristic Impedance: 50 Ohms
• Switching Configuration: Dual independent 1×4 multiplexers
• Insertion Loss: < 0.5 dB (30 MHz), < 0.75 dB (100 MHz), < 1.25 dB (300 MHz)
• Crosstalk (within group): < −100 dB (30 MHz), < −85 dB (100 MHz and 300 MHz)
• Crosstalk (group-to-group): < −85 dB (30 MHz), < −65 dB (100 MHz), < −50 dB (300 MHz)
• VSWR: < 1.06 (30 MHz), < 1.12 (100 MHz), < 1.43 (300 MHz)
• Rise Time: < 0.7 nsec
• Signal Delay: < 2.5 nsec (channel match < 90 psec)
• Thermal Offset: < 15 µV
• Closed Channel Resistance: 10⁷ Ohms (< 40°C, 95% RH)
• Maximum Voltage (center-to-center/center-to-low): 250 V DC, 30 V AC RMS, 42 V AC peak
• Maximum Voltage (low-to-chassis/low-to-low): 42 V DC
• Maximum Current: 30 mA DC, 300 mA AC RMS per channel
– Key Features
• Dual independent channel groups with electrical isolation from chassis
• BNC connectors for direct signal interfacing
• Low-crosstalk design suitable for spectrum analyzers, network analyzers, and distortion measurement
• Minimal capacitive coupling (center-to-center < 0.002 pF)
• High DC isolation preventing ground loops
– Typical Applications
• Multi-channel signal routing in VHF measurement systems
• Input multiplexing to oscilloscopes and waveform analyzers
• Precision switching in distortion and network analysis
• Isolated signal distribution in GPIB-based test systems
– Compatibility & Integration
The 44472A plugs directly into Keysight/Agilent/HP 3488A and 3499A/B/C mainframes.
Physical: 8 × 6 × 4 in, 5 lbs
