The R&S HM8123 Universal Counter

The R&S HM8123 offers high sensitivity and the frequency range runs up to 3 GHz.

Inputs A and B (BNC) have a measurement range from DC to 200 MHz; input C (SMA) has a range of 100 MHz to 3 GHz. The input impedance of A and B is adjustable at 50 Ω or 1 MΩ; sensitivity is 25 mV.

This instrument offers nine measurement functions, external gate and arming connectors. With 10 digits, the LCD provides an accurate reading of the measurement results. RS-232 and USB dual interface is standard and a galvanically isolated IEEE-1488 (GPIB) interface is optionally available. The instrument is easy to use, has a quick start-up and is quiet due to its fanless design.

The R&S HM8123 versions

The counter is available in two versions:
– HM8123              3 GHz Universal Counter, TCXO (temperature stability ±0.5 x 10-6)
– HM8123-X         3 GHz Universal Counter, OCXO (temperature stability ±1.0 x 10-8)


– HO85                     OCXO temperature stability ±1.0 x 10-8 for HM8123, HM8134-3, HM8135, OCXO Installation only ex-factory
– HO880                  IEEE-488 (GPIB) Interface

For more information about frequency counters we would like to refer you to the overview page or contact one of our consultants.


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