• Country
• United States of America (USA)

• Manufacturer / Brand
• Electro Scientific Industries, Inc. (ESI); Portland, OR

• Year
• 1980 ??

• Category
• Service- or Lab Equipment

• Radiomuseum.org ID
• 206771

Click on the schematic thumbnail to request the schematic as a free document.

• Number of Transistors
• Semiconductors present.

• Semiconductors

• Wave bands
• - without

• Power type and voltage
• Alternating Current supply (AC) / 115; 230 Volt

• Loudspeaker
• - - No sound reproduction output.

• Material
• Metal case

• from Radiomuseum.org
• Model: Impedance Meter 251 - Electro Scientific Industries,

• Shape
• Tablemodel with Push Buttons.

• Dimensions (WHD)
• 217 x 145 x 380 mm / 8.5 x 5.7 x 15 inch

• Notes
• 4 terminal L-C-R bridge/meter.
  Ranges 199.9 pf - 199.9uF, 199.9uH - 199.9H, 199.9 mΩ - 1999.9kΩ.
  DC bias can be applied to the component under test (rear panel terminals).
  Display with 4 nixie tubes.

• Net weight (2.2 lb = 1 kg)
• 4.3 kg / 9 lb 7.5 oz (9.471 lb)

• Source of data
• - - Data from my own collection

• Author
• Model page created by John Sykes. See "Data change" for further contributors.

• Other Models

• Here you find 8 models, 8 with images and 3 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Electro Scientific Industries, Inc. (ESI); Portland, OR