The Marconi 2440 Microwave Counter provides three channel automatic frequency measurement from 10 Hz to 20 GHz in a small portable case style. PLEASE NOTE: This item is faulty.
Serial No: 187382/002
FAULTY. NO INPUT ON CH3. See Tests/Remarks below.
The Marconi 2440 Microwave Counter provides three channel automatic frequency measurement from 10 Hz to 20 GHz in a small portable case style.
Measurements and operational details are displayed as a 9-digit liquid crystal readout. Resolution to the full 9 digits is automatic or can be manually set for 0.1 Hz over the full range to 20 GHz. The display rate can be adjusted from 11 ms to 20 s independently of resolution, which is keyboard selected from 0.1 Hz to 10 kHz. The microwave acquisition time is typically 200 ms. giving fast response and measurement updates.
The ability of the 2440 to make measurements in the presence of wide FM and large depth AM modulations is an important feature for applications in the communications industry. Frequency measurements can be made with up to 30 MHz peak-to-peak worst case FM and 40% AM depth.
The 2440 also features automatic amplitude discrimination. This allows the counter to measure the large signal that is applied to one of the three input channels, at the same time ignoring other signals. In addition Channel A incorporates a switchable low-pass filter to increase the attenuation above 5 kHz, so improving noise immunity when measuring low frequency signals.
- 10Hz – 20GHz frequency range
- 0.1Hz resolution
- High sensitivity
- High FM / AM tolerance
- Frequency offset facility
- CH1 = Test 10 Hz to 100 MHz – OK
- CH2 = Test 50 MHz to 600 MHz – OK
- CH3 = Faulty – no input.
- Change over switch A/B/C – push many times to change – intermittent fault.
- Case/body – in good condition.
Shipping (UK Mainland): £15.00 GBP