575300

Epoxy-Insulated Tungsten Microelectrode

Epoxy-Insulated Microelectrodes are consistently high-quality electrodes available in either Stainless Steel or Tungsten. We know that electrodes are difficult to manufacture, therefore we take extra care to monitor each step of microelectrode fabrication. Microscopic inspections are performed and microelectrode resistance and capacitance are checked to ensure insulation integrity and proper electrode impedance.

Metal electrode impedance is measured with a 2 nAp-p current at 1 kHz. The tolerance range for 5M epoxy-insulated microelectrodes is 3M to 8M, and the tolerance range for 12 M epoxy-insulated microelectrodes is 10M to 18M. We skew the values a little high because it is possible to lower the impedance at a later stage by passing current through the electrode.

Features

  • Electrical characteristics verified at 1kHz
  • Gold-plated 0.032" pin connector on each electrode
  • Low impedance connection to cable or amplifier input
  • Microscopic inspection to ensure quality
  • 3 inches (76 mm) long
  • Packaged 12/box
  • Available with 8 degree or 12 degree tapered tips.

Metal electrodes do not behave as resistors due to polarization. They have low series resistances for high frequency signals and high series resistance for low frequency signals. For example, for DC inputs a typical tungsten microelectrode will have a series resistance of about 200 MΩ. However, for a 1 kHz sine input, the same electrode will have an impedance of 1 MΩ. Its impedance will further drop to only 100 kΩ for a 100 µs pulse.

Note: Estimated lead time for all electrode orders is 2 to 3 weeks from date of order. Orders over 5 boxes of a particular product number might take longer.

Catalog # Diameter Length Tapered
Tip Size
AC Resistance
(M Ohms)
Qty/Box Price Discount
in µm in mm
577200
0.005 127 3 76.2 12 ° 12 12
Price: $127.00
577100
0.005 127 3 76.2 12 ° 5 12
Price: $127.00
575400
0.005 127 3 76.2 8 ° 12 12
Price: $127.00
575300
0.005 127 3 76.2 8 ° 5 12
Price: $127.00
577400
0.010 254 3 76.2 12 ° 12 12
Price: $108.00
577300
0.010 254 3 76.2 12 ° 5 12
Price: $108.00
576000
0.010 254 3 76.2 8 ° 12 12
Price: $108.00
575500
0.010 254 3 76.2 8 ° 5 12
Price: $108.00
577600
0.020 508 3 76.2 12 ° 12 12
Price: $108.00
577500
0.020 508 3 76.2 12 ° 5 12
Price: $108.00
577000
0.020 508 3 76.2 8 ° 12 12
Price: $108.00
576500
0.020 508 3 76.2 8 ° 5 12
Price: $108.00
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