Portable Spectral Induced Polarization Unit (PSIP)

The PSIP is a low-cost high-performance multi-channel spectral induced polarization (SIP) instrument optimized for laboratory measurements manufactured by Ontash & Ermac.

PSIP is fully customizable to the user needs and can come in different configurations, from 4 to 24 measurement channels. The number of receiving channels can increase by combining multiple PSIP units together or adding switching units (PSFS)

PSIP can also perform self potential (SP) and time domain induced polarization (TDIP) measurements with the use of stimulus switch unit.

PSIP can be used for small scale field applications.

Technical Characteristics

1mHz – 24kHz frequency range
Up to 4 simultaneous test setups
Simultaneous sampling of up to 24 voltage sense pairs
Actively driven electrode guards/shields for overcoming capacitive coupling and noise
User selectable (4) reference internal resistor values
External reference resistor
Web browser user interface
Water-resistant field/travel case

Multiple units can be connected together for increased channel capacity

Stimulus Outputs [1..4]: (Base Configuration – 2 Outputs)

Type: Differential

Voltage: ±10V (20V p-p)

Current: 10mA (per channel)

20mA (all channels)

Impedance: 100m

Sense Inputs [1..24]: (Base Configuration – 4 Inputs)

Type: Differential

Voltage: ±10V (20V p-p)

Differential Impedance: 4G /1.25pF

Common Mode Impedance: 1G /4pF



USB Type A



Analog Ground

Chassis Ground

External Trigger In

External Trigger Out

External Reference Resistor x 4

Power Input:

12V DC Nominal


Unit: 17.16” x 10.53” x 7.69”

Case: 24.6” x 19.7” x 14.4”

PSIP – tomography system

A customized version for the PSIP, optimized for small scale field applications, is also available. The system features 6 single ended measurement channels, and a 24 electrode switching unit. This version also features a more powerful transmitter.