Agilent 5315B

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The HP 5315B is a universal counter, measuring signals over a range from 0.1 Hz to 100 MHz. The 5315B measures frequency, period, time interval, time interval average, time interval holdoff (delay), and ratio. A totalize function with manual or external gating is also provided. All measurements except totalize are displayed in scientific notation with up to eight digits of resolution.

Two independent input channels provide time interval measurements. Each input channel has an attenuator (X1, X20), trigger slope selector, trigger level and sensitivity control, and AC-DC coupling. A switchable low-pass filter on Channel A and three-state trigger lights are also provided.

Option 003, 1 GHz third or "C" input channel for the 5315B, provides frequency measurements from 50 MHz to 1 GHz. The input sensitivity is 15 mV for frequencies between 50 and 650 MHz, and 75 mV for frequencies between 650 MHz and 1 GHz. The Channel C is a 50 Ω input with a dynamic input range of 1 Vrms. The input is prescaled by 10 to achieve a 1 GHz frequency range.

• Measurements: Frequency, period, time interval, time interval average, time interval delay (holdoff), ratio, totalization, time base
• Channel A and Channel B inputs
  • Range: DC coupled, 0 to 100 MHz, AC coupled, 30 Hz to 100 MHz
  • Sensitivity: 10 mVrms to 10 MHz, 25 mVrms to 100 MHz, 75 mVp-p at minimum pulse width of 5 ns
  • Dynamic range: 30 mV to 5 Vp-p, 0 to 10 MHz, 75 mV to 5 Vp-p, 10 to 100 MHz
  • Signal operating range: +2.5 Vdc to ‑2.5 Vdc
  • Coupling: AC or DC, switchable
  • Filter: Low pass, switchable in or out of Channel A, 3 dB point of nominally 100 kHz
  • Impedance: 1 MΩ nominal shunted by <40 pF
  • Attenuator: X1 or X20 nominal
  • Trigger level: Variable between +2.5 Vdc and ‑2.5 Vdc
• Common input specifications are the same except for the following differences
  • Sensitivity: 20 mVrms to 10 MHz, 50 mVrms to 100 MHz, 150 mVp‑p
  • Dynamic range: 60 mV - 5 Vp-p 0 to 10 MHz, 150 mV - 5 Vp-p 10 to 100 MHz
  • Impedance: 500 kΩ nominal shunted by <70 pF
• Period range: 10 ns to 10⁵ s
• Time interval range: 100 ns to 10⁵ s
• Time inteval average range: 0 ns to 10⁵ s
• Time interval delay (holdoff): Front panel gate time knob inserts a variable delay of nominally 500 µs to 20 ms between Start (Channel A) and enabling of Stop (Channel B)
• Ratio range: 0.1 Hz to 100 MHz
• Totalize
  • Range (manual or external gating): 0 to 100 MHz
  • A gated by B: Totalizes input A between two events of B. The instrument must be reset to make new measurements. Gate opens on A slope, and closes on B slope
• Time base frequency: 10 MHz
• Gate time: Continuously variable, nominally from 60 ms to 10 s or 1 period of the input, whichever is longer
• Sample rate: Up to 5 readings per second nominal except in time interval mode, where it is continously variable nominally from 4 readings per second to 1 reading every 10 seconds via Gate Time control
• Options
  • 001: Temperature compensated time base TCXO (cannot be installed together with Option 004)
  • 003: C Channel 1 GHz input
  • 004: High stability time base—oven-contained oscillator (cannot be installed together with Option 001)
  • 006: Offset/Normalizer