General Radio GR900 50-Ohm Terminations/Mismatches used or new for sale at Used-Line
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General Radio GR900 50-Ohm Terminations/Mismatches () Main Features and Specifications

Product Specs

  • Status -

Standard terminations are useful for calibration of bridges, slotted lines, admittance bridges, network analyzers, and reflectometers. The 50 ohm 900-W50 termination can also be used as a precision dummy load or as a termination in measurements of networks with more than one port. This termination, together with the 900-WNC Short Circuit and 900-LZ Air Lines, can form a calibration set for computer connection of measuring instruments. With an appropriate GR900 adaptor, it can be used as a low-SWR, precision type-N termination, or BNC, or C, etc.

Standard mismatches introduce reflections of known SWR in a 50 ohm transmission line and are therefore useful in the calibration of reflectometers, network analyzers, and SWR-measuring instruments.

  • Standard precision resistive terminations
    • 900-W50: DC resistance 50 Ω, SWR 1.005 + 0.005 fGHz 
    • 900-W100: DC resistance 100 Ω, plane position 4 cm nominal
    • 900-W200: DC resistance 200 Ω, plane position 4 cm nominal
  • Standard precision mismatches
    • 900-WR110: DC resistance 45.45 Ω, SWR 1.1 nominal
    • 900-WR120: DC resistance 41.67 Ω, SWR 1.2 nominal
    • 900-WR150: DC resistance 33.33 Ω, SWR 1.5 nominal
  • Frequency: DC to 8.5 GHz

Open circuit terminations are useful in establishing initial conditions of line length and signal phase, as shielding caps for open-circuited lines, and at low frequencies, as capacitance standards.

  • 900-WO with plane position at 0.26 ±0.012 cm; capacitance: 0.172 ±0.008 pF at low frequencies
  • 900-WO4 with plane position at 4 ±0.01 cm; capacitance: 2.670 pF ±0.25%, below 70 MHz
  • Frequency: DC to 8.5 GHz

Short circuit terminations are useful in establishing initial conditions of line length and signal phase in, for example, impedance measaurements. An s-c termination consists of a precision-machined, silver-plated disk, mounted in a centering gear ring and locking-nut assembly, to produce a fixed short circuit. The 900-WNC, 900-WNE, and 900-WN4 all include a support for one end of the inner conductor of a 900-LZ reference air line, which is beadless.

  • 900-WN without support, plane position at 0.00 cm; reflection coefficient at >0.999
  • 900-WNC with support, plane position at 0.00 cm; reflection coefficient at >0.999
  • 900-WNE with support, plane position at 0.26 ±0.005 cm; reflection coefficient at >0.998
  • 900-WN4 with support, plane position at 4.00 ±0.01 cm; reflection coefficient at >0.996
  • Frequency: DC to 8.5 GHz