The 545B and 548B frequency counters are popular in R&D labs and production test settings because they perform multiple duties and a variety of applications. They provide the capability to selectively measure individual signals in a multi-signal environment. Additionally, they can simultaneously measure the average power level of the isolated input signal. The 545B measures CW, FM, and AM frequencies from 10 Hz to 20 GHz, and the 548B extends the range to 26.5 GHz. Optionally, the 548B’s range can be further extended to 110 GHz.

Frequency Limits for Selective Frequency and Power Measurements -30 dBm sensitivity Power Measurements to 0.1 dB Resolution Optional Frequency Extension to 110 GHz (548B Only) 10 dB automatic amplitude discrimination

01 Digital-to-analog converter
02 Power measurement
05 High-stability ovenized time base
06 Frequency extension to 110 GHz (548B only)
09 Rear panel signal input

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