Physiological recordings can be easily contaminated by noise and interference. In many cases, high electrode contact impedance is a big part of the problem. Noise often appears as 50 or 60 Hz "hum" from surrounding AC-powered electrical devices or as erratic spikes due to any motion of the lead wires. In virtually every case, these troublesome artifacts can be mitigated or completely eliminated by reducing contact impedance at the skin/electrode interface. UFI's Checktrode™ applied electrode contact impedance testers are designed to help accomplish this task.

Description
Specifications

Model 1089ES Checktrode with Lead Selector

The "ES" includes a switch and associated circuitry to select up to 22 separate electrode leads. This allows the 1089ES to be used to check applied electrode contact impedance of multiple electrode configurations such as Cranial EEG "caps" -- rapidly and painlessly. Price includes interfacing to the connector of your choice for most connectors. Please indicate your required connection type if other than Standard caps.

Please also see 1089NP

Review a representative Model 1089ES user manual

1089 general specifications

impedance readout: 3 1/2 digit LCD display
contact impedance range: 0-199 KOhm (custom ranges available)
excitation frequency: 30 Hz (typical)
typical excitation current: 10 uA p-p (constant current)
calibration setting: 50 KOhm
input connectors: 2 each 0.080" and 0.060" safety jacks and 1 male snap (1089)
battery test load: 1 KOhm
power switch: push-button on with auto-shutdown after 5 minutes
rugged plastic case: 6" x 3.5" x 1.5" (Std 1089)

Model 1089 MkIII Checktrode (impedance meter)	Model 1089e Economy Checktrode (Impedance)
Model 1089NP Checktrode (impedance meter)