The Marconi IFR Aeroflex 2187 is a programmable microwave attenuator delivering precise signal level control from DC to 20 GHz. Purpose-built for automated test equipment, signal conditioning, and RF laboratory work, it provides 0 to 130 dB attenuation in 1 dB increments with calibration data traceable to international standards stored internally for each frequency point.
Technical Specifications
Frequency & Attenuation
• Frequency range: DC to 20 GHz
• Attenuation range: 0 to 130 dB (1 dB steps)
• Insertion loss: Typically 0.2 dB + 0.25 dB/GHz
• Input impedance: 50 Ω nominal
• VSWR: 1.25:1 (DC to 2.7 GHz); 1.5:1 (2.7 to 6 GHz); 2.0:1 (6 to 18 GHz)
• Power rating: 1 W (50 W pulsed)
Calibration & Accuracy
Internal calibration data is stored as a function of frequency for each attenuator element, traceable to international standards. A corrected attenuation mode automatically selects the nearest setting to the required value. User calibration data can be stored in non-volatile memory—up to 10 independent calibrations—reducing test system uncertainties.
– Key Features
Control Interface
• Microprocessor-controlled operation with direct keyboard access
• IEEE-488.2 interface (standard): complies with SH1, AH1, T6, L4, SR1, RL1, PP0, DC1, DT0, C0, E2 subsets per IEEE Std. 488.1
• All functions except power switch are remotely programmable
• Rear panel 37-way D-type connector provides 16 external control lines
• Each control line: 0.5 A sink capability, 35 V rating, diode clamp protection for inductive loads
• Static or pulsed operation; internal pulse duration settings: 10 ms, 20 ms, 30 ms, 40 ms, or 50 ms
• Front panel or GPIB readout of control line states
Power & Installation
• AC supply: 100 V, 120 V, 220 V, or 240 V (50–400 Hz)
• Maximum power consumption: 80 VA
• Installation category 2 supply
– Typical Applications
Automated test equipment (ATE) systems, receiver sensitivity measurements, signal path characterization, and gain/loss validation in RF and microwave design and production environments.
– Compatibility & Integration
Standard IEEE-488.2 interface enables direct integration into GPIB-based test systems. External switch control via 37-way D-type connector supports integration with custom ATE architectures. Internally stored, internationally traceable calibration data—combined with user-programmable memory—supports multi-unit systems requiring coordinated attenuation without external calibration equipment.
