Keysight 536A Frequency Meter

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Frequencies 960 MHz to 4.2 GHz and 3.7 to 12.4 GHz can be read directly and accurately with Keysight 536A and 537A coaxial frequency meters (formerly Agilent Technologies). Convenient readout with high resolution is provided by long spiral dials. These dials have all frequency calibrations visible so you can tell at a glance the specific portion of each band you are measuring.

Overall accuracy of these frequency meters is 0.17% and includes such variables as dial calibration, temperature variation over a 20 °C range, relative humidity effects, and backlash. Extreme resolution and readability permit individual scale correction charts to be made and readings repeated with even higher accuracy. Calibration marks are every 2 MHz for the 536A and every 10 MHz for the 537A. Even at the high frequency end of the dial, minimum spacing between calibrations is such that you can easily resolve small differences of frequency. The tuning plunger is spring-loaded to eliminate backlash.

There are no spurious resonances at any setting. A one-quarter wavelength tuning mode is employed and capacitively loaded to prevent the three-quarter wavelength mode of higher frequencies from being excited and giving a spurious response. A well-matched section of strip line couples microwave energy into the cavity. Resonance is indicated by a dip in output power of approximately 1 dB. Cavity Q is typically greater than 1500 (536A). Keysight 536A Frequency Meter instruments were previously manufactured by Agilent Technologies.