The Marconi IFR Aeroflex 2440 is a microwave frequency counter delivering precise measurements from 10 Hz to 20 GHz across three switch-selected channels. Engineered for laboratory, integration, and field applications, this instrument combines high sensitivity, fast acquisition times, and microprocessor-controlled operation to meet demanding metrology requirements. A 9-digit liquid crystal display with annunciators presents measurement data clearly, while adjustable update rates from 11 ms to 20 seconds and selectable resolution support both rapid monitoring and high-precision analysis.
– Technical Specifications
Frequency Range: 10 Hz to 20 GHz across three channels—Channel A (10 Hz to 100 MHz), Channel B (50 MHz to 600 MHz), Channel C (600 MHz to 20 GHz).
Resolution: Up to 9 digits automatically; manually settable from 0.1 Hz to 10 kHz with 0.1 Hz resolution achievable across the full range.
Display: 9-digit liquid crystal readout with annunciators.
Acquisition & Update: Typical 200 ms acquisition for microwave frequencies; display update rate adjustable from 11 ms to 20 seconds independently of resolution.
Sensitivity: Channel A—30 mVrms (10 Hz to 10 MHz), 50 mVrms (10 MHz to 50 MHz), 100 mVrms (50 MHz to 100 MHz); Channel B—−20 dBm (50 MHz to 500 MHz), −15 dBm (500 MHz to 600 MHz).
Maximum Input: +27 dBm on all channels; optional 10 or 20 dB attenuator extends protection to +37 dBm.
Input Impedance: Approximately 10 kΩ AC coupled for direct count (10 Hz to 100 MHz).
Time Base Stability: Better than ±1.5 ppm over 0°C to 50°C; ageing rate better than 1 ppm/year nominal after 1 month continuous operation (oven-controlled crystal oscillator).
Power: 105 V to 120 V or 210 V to 240 V ±10%, 50 Hz to 400 Hz ±10%; 50 VA maximum.
– Key Features
• FM tolerance to 30 MHz peak-to-peak worst-case; AM tolerance to 40% depth
• Automatic amplitude discrimination to measure largest signal while rejecting others on same channel
• Switchable low-pass filter on Channel A for enhanced low-frequency noise immunity
• Frequency offset facility—add or subtract numerical offsets via keyboard or previous measurement
– Typical Applications
• RF/microwave device and system characterization
• Production and acceptance testing
• Field service and troubleshooting
– Compatibility & Integration
Three switch-selected input channels accommodate signals across 10 Hz to 20 GHz with single-unit operation.
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