Tag: Signal Path Faults

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Vector Network Analyzer: Common Faults and Solutions”Vector Network Analyzer: Troubleshooting Guide and Repair Services for Various Brands and Models”Vector Network Analyzer: Common Faults and Solutions

I. Common Fault Phenomena

  1. Power Supply Faults:
    • Indicators: Front panel power indicator not lit, fan not rotating, network analyzer unable to start normally, or constant resetting due to unstable power supply voltage.
  2. Display Faults:
    • Manifestations: No display (black screen), scrambled screen, grayscale display. Possible causes include monitor failure, graphics processing board failure, or CPU failure.
  3. Local Oscillator Faults:
    • Issues: Local oscillator unlock, low local oscillator power resulting in high signal insertion loss, and poor local oscillator spectrum purity.
  4. Signal Path Faults:
    • Components affected: Input connectors, signal cables, attenuators, preselectors, frequency converters, intermediate frequency amplification/filtering, data acquisition and processing.
  5. Processor Faults:
    • Primarily involve processor hardware and program (software) faults, with the latter being more common.

II. Solutions

  1. Power Supply Fault Repair:
    • Check power cord connections and power outlets to ensure proper power supply.
    • Replace the power module or repair the power circuit if the power indicator is not lit or the fan does not rotate.
  2. Display Fault Repair:
    • Inspect display cable connections and related circuit boards for proper connection.
    • Replace the display or relevant circuit boards if the issue persists.
  3. Local Oscillator Fault Repair:
    • Examine local oscillator circuit boards and connections for damage or looseness.
    • Adjust the local oscillator circuit or replace relevant components if there is unlock or low power.
  4. Signal Path Fault Repair:
    • Check all components in the signal path, including input connectors, signal cables, attenuators, etc., for secure connections and proper functioning.
    • Replace or repair faulty components promptly.
  5. Processor Fault Repair:
    • Restart the instrument and check software settings for any program errors or configuration issues.
    • Reset the processor or reinstall software if the problem remains.
  6. Preventive Measures:
    • Ensure proper grounding to avoid electrostatic interference.
    • Read and follow instrument technical specifications and warning labels.
    • Pay attention to electrostatic protection, especially for exposed interfaces.
    • Maintain good instrument ventilation and avoid blocking air outlets.
    • When performing DC input, ground the equipment before connecting the power supply.

III. Brands and Models That Can Be Repaired

  1. Keysight Technologies (formerly Agilent Technologies):
    • 8753ET
    • ENA Series: E5061B, E5062A, E5063A, E5071B, E5071C, E5072, E5080A, E5080B
    • PNA Series: N5225A, N5225B, N5227A, N5227B, N5230C, N5230A, N5222A, N5221B, N5224, 5225BT, 5227, 5230C
    • PNA-X Series: N5247B, N5241A, N5241B, N5249A, N5249B
  2. Yi Zhuo Optoelectronic Technology (TFN):
    • Handheld Spectrum Analyzers: RMT714A, RMT716A, RMT717A, RMT719A, RMT720A, RMT740A, FAT130, FAT150, FAT750, FAT801, FAT811, FAT860 (5KHz-20GHz)
    • Antenna Feeder VSWR Testers: T300F, T300H (300KHZ-3GHZ)
    • 10G Ethernet Testers: T200K, T3000A, T5500A
    • Network Synthesis Testers: TT70-S1, TT70-S2, TT70-S3, TT70-S4
  4. Rohde & Schwarz:
    • ZNA Series: ZNA26, ZNA43, ZNA50, ZNA67
    • ZVA Series: ZVA8, ZVA14, ZVA24, ZVA40, ZVA50, ZVA67, ZVA110
    • ZVB Series: ZVB8, ZVB14
    • ZNB Series: ZNB20, ZNB26, ZNB40
  5. Anritsu:
    • MS4647B (ShockLine), MS46524B (ShockLine), MS46131A, MS4642B, MS4644B, MS4645B, MS4647A, MS46522A, MS46522B, MS46322, MS46121, MS46122
  6. Tektronix:
    • TTR500 Series: TTR500, TTR503A, TTR506A, MSO58LP, LPD64
    • RSA5000 Series: RSA5115B, RSA5103B, RSA5000-B40, RSA5000-VSA, RSA5000-EMI, RSA5000-AMK, RSA5000-PA
    • RSA6000 Series
    • RSA7000 Series: 7100A
  7. Copper Mountain Technologies:
    • Cobalt Series (e.g., S5180)
    • Planar Series (e.g., S5048)
    • R Series: R60, R140B, R180
    • Others: S5090, TR1300, M5045, M5065, M5090, M5180, S5045, S5065, S5085, S5180B, S5243, SC5065, SC5090, SN5090-6 to SN5090-16, C1209 to C4409, C1220 to C4220
  8. National Instruments (NI):
    • PXI Network Analyzer Series: PXI-2596, PXIe-5632, PXIE-8840
    • VirtualBench Multifunction Instruments: VB-8032, VB-8034, VB-8054, 783555-10
  9. RIGOL:
    • RSA5032, RSA5065-TG, RSA5000, RSA3000, RSA3015N, RSA3030, RSA3045N, RSA3030-TG, RSA3045, RSA3045-TG, RSA5032-TG, DSA815, DSA815-TG, DSA875, DSA875-TG, DSA832, DSA832-TG, DSA832E, DSA832E-TG, DSA705, DSA710
  10. CETC 41st Research Institute:
    • Siyi 3672 Series: 3672A, 3672B, 3672C, 3672D, 3672E
    • AV36580A: A new-generation vector network analyzer with multiple communication functions, automated testing capabilities, and wide test applications.
  11. Other Brands:
    • SAMZHE, Fluke, Spirant, Ideal Industries (USA)

Repair and Sales Services

Longi Electromechanical Company specializes in the repair of network analyzers (including wireless spectrum analyzers, antenna feeder VSWR testers, Ethernet testers, network synthesis testers, vector network analyzers, real-time spectrum analyzers, USB vector network analyzers) with nearly 30 years of experience. We provide quick repairs for various instruments and also offer sales and recycling of used network analyzers. Feel free to contact us for more information.