Keysight formerly Agilent T&M 5383A

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The HP 5383A is a direct-counting frequency counter that has a range of 10 Hz to 520 MHz. Nine display digits provide a resolution of one Hz per second for inputs up to 520 MHz. Front panel controls allow a selection of gate times, input impedances, and attenuators. A rear panel connector and associated selector switch allow either an external time base oscillator input, or monitoring of the internal time base oscillator. When the optional temperature compensated crystal oscillator (TCXO) is installed, the rear panel connector serves only as a time base monitor. In addition, a rear panel power selector switch permits the 5383A counter to operate with line voltages ranging from 90 V to 252 V (line frequency range: 48 to 440 Hz).

• Frequency range: 10 Hz to 520 MHz
• Display: Nine-segment LED digits
• Three selections input impedance
  • 50 Ω x 1 (nominal) - fuse protected
  • 1 MΩ x 1 (<40 pF shunt)
  • 1 MΩ x 10 (<40 pF shunt, attenuation factor of 10)
• Attenuation: x10 in 1 MΩ
• Maximum input at 50 Ω x 1, DC to 520 MHz is 3.5 mVrms (+24 dBm) Other maximum values are 200 Vdc + value depending on switch position and range.
• Gate time: Manually selected 0.1 s, 1 s, 10 s
• Time base
  • 10 MHz (Crystal oscillator)
  • <3 ppm per month due to aging
  • ±2.5 ppm due to temperature variation
  • ±0.5 ppm due to ±10% line variation
• Time base output
  • Frequency: 10 MHz time base
  • Voltage: 200 mVp-p
• External frequency standard input (rear panel): 10 MHz
• Rear panel input
  • Maximum input: 10 Vrms
  • Impedance: >500 Ω
• Ratio: Rear panel input, 100 kHz to 10 MHz
• Option 001 temperature compensated XTAL oscillator: 10 MHz TCXO - Does not provide rear panel input capability