Keysight Technologies (Agilent HP) 4945A used or new for sale at Used-Line
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Keysight Technologies (Agilent HP) 4945A () Main Features and Specifications

Product Specs

  • Status Discontinued
  • Alternative No replacement.

The HP 4945A transmission impairment measuring set provides the complete set of measurements needed to quickly isolate faults and qualify circuits for voice, data, or broadcast transmission up to 110 kHz. All measurements are compatible with Bell standards including the ability to test local distribution loops for Dataphone Digital Service (DDS) to 56 kbps.

  • Transmitter frequency range: 20 Hz to 110 kHz
  • Receiver range: -60 dBm to +13 dBm
  • Receiver noise
    • Message circuit noise: 10 to 90 dBrn
    • Noise-with-tone: 10 to 90 dBrn
    • Noise-to-ground: 40 to 130 dBrn
    • Signal-to-noise ratio: 10 to 45 dB
    • Noise filters: C-Mess, 3kHz, 15kHz, Program, 50 kbit
    • Notch filter: 50 dB rejection from 995 to 1025 Hz
  • Peak to average ratio range
    • Transmitter/receiver range: -40 to 0 dBm
    • 0 to 120 P/AR units
  • Impulse noise range
    • Low: 30 to 110 dBrn
    • Mid: 2, 3, 4, or 6 dB above low
    • High: 2, 3, 4, or 6 dB above Mid
  • Phase hits thresholds: 5° to 45°
  • Gains hits threshold: 20 to 10 dB
  • Drop outs threshold: -12 dB
  • Envelope delay
    • Transmitter: -40 to 0 dBm level range, 83⅓ Hz modulation
    • Receiver: -40 to +10 dBm level range
  • Portable package for field use
  • Versatile I/O for systems use provides three interfaces as accessaries: HP-IB, HP-IL, RS-232-C
  • Master/slave testing for end-to-end testing
  • Automatic gain slope measurement
  • Softkeys provide flexibility and ease-of-use
  • Programmable sweep
  • CRT can provide simultaneous display of amplitude and phase for some measurements
  • Flexible hardcopy output
  • Self-check at power on
  • Built-in calibration mode
  • Measurements
    • Level/frequency (20 Hz - 110 kHz)
    • Attenuation distortion
    • Envelope delay distortion
    • Gain slope
    • Message circuit noise
    • Notched noise
    • Signal-to-noise
    • Noise-to-ground
    • Phase jitter
    • Amplitude jitter
    • Intermodulation distortion
    • 3-level impulse noise
    • Gain hits
    • Phase hits
    • Dropouts
    • P/AR
    • 2-wire return loss (0 to 40 dB), 4-wire return loss (0 to 50 dB), ERL, SRL Hi, SRL Lo
  • Options
    • Option 001: 100/200 Volt operation
    • Option 101: HP-IB module
    • Option 102: RS-232-C module
    • Option 103: HP-IL module
    • Option 104: 19-inch rack mount kit