The HP438A is a dual input power meter that has two HP8482H thermal power heads. It has a 50MHz, 1mW (0dBm) reference source for the calibration of each power head. The meter can display Watts or dBm and %relative.
For each HP8482H head:
Frequency range: 100kHz to 4.2GHz
Level range: -70dBm to +35dBm
Maximum I/P: +35dBm
Power head connector: N-type
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