Keysight 8478B, Руководство по эксплуатации и обслуживанию

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30 Keysight 8478B Thermistor Mount
Maintenance
Mechanical Shock
4-
Mechanical Shock
The Model 8478B is a precision instrument. A void dropping or other
mechanical shocks. Such shocks destroy the resistive match between
thermistor elements, or otherwise degrade performance.
Test equipment and accessories required to perform maintenance are listed in
Table 4-1 . Equipment other than recommended models can be used provided
the critical specifications are satisfied.
The following procedures apply to the 8478B/ 432 combination. The same
procedures can be used for the 431 except that the COARSE ZERO and
FINE ZERO controls are replaced by the ZERO/VERNIER control.
Table 4-1 Recommended Test Equipment
Instrument
Type
Critical Specifications Recommended
HP Model
Sweep
Oscillator
Accuracy: ± 1% full scale for all RF Units
Leveling Capabilities
Frequency Range: 8GHz to 18GHz 8690A,
8694A,
8695A
SWR Meter Sensitivity: 0.15 μ V for full scale deflection
Accuracy: ±0.05 dB/10 dB step
Range: 70 dB in 10 dB steps
415E
Directional
Detector
Frequency Range: 8.0 to 12.4GHz
Maximum SWR: 1.25:1 789C
Directional
Coupler
Frequency Range: 12.4 to 18GHz 10 dB Coupler
SWR: <1.05:1 P752C
Carriage Accepts HP 816A Slotted Line 809C
Slotted Line Frequency Range: 8 to 18GHz
Impedance: 50 ohms ±0.2 ohms
SWR: <1.06:1, 8 to 18GHz 816A
Probe Frequency Range: 8 to 18GHz 447B
Passband
Filter
Passband Frequency: 12.4 to 18GHz P362A
Crystal
Detector
Frequency Range: 12.4 to 18GHz P424A