Skip to content

FieldVolt Instrument Power Standard

Purpose

The FieldVolt instrument power standard was established in 2024 by Leeman Geophysical LLC in collaboration with field practitioners in an effort to create a standardized power interface for geophysical field equipment. Interoperability in the field means reduced time building cables, looking up pinouts, improvising solutions, and often damaging instruments. Anything with the FieldVolt logo by the power port can be plugged into anything else with the FieldVolt logo using cables with standard pinouts and work seamlessly.

Connectors

Manufacturer

Connectors in the FieldVolt ecosystem are Amphenol Industrial connectors. The sealing method (potted, grommets, etc) is not determined by the standard as all comply with the weatherproofing requirements of field equipment.

Nomenclature

Connectors are simply named and should be referred to/labeled as described below.

IN refers to connectors that are bringing power into a piece of equipment from an external power source. For example, the power port on a datalogger is labeled “IN”. The charging port on a portable battery box is labeled “IN”.

OUT refers to connectors that provide power to attached equipment. For example, the output of a battery box is labeled “OUT”, as is the output of a wall power supply or charger.

Pin/Socket

Connectors with power output on them (i.e. connected to batteries, solar panels, etc) are socket connections to help prevent accidental shorting of connections. Connectors for power input have corresponding pins.

FieldVolt Logo and Name

The FieldVolt name shall be reproduced as shown in this document, as one word with a capital F and V character. The Univers font shall be used for the name or Roboto Condensed where Univers is not available. The logo for FieldVolt is available for public download below. Versions of the logo including filled, circled, and plain are provided and the one providing the most contrast on the surface it is applied to should be used.

Examples of the logo.

FieldVolt Logo

FieldVolt Logo in Dark Cricle

FieldVolt Logo in Border

12 VDC Field Power

12 volts DC (nominal) field power is the most common power source for geophysical field equipment. Much of this equipment has low current requirements as it is meant to be battery/solar operated for long periods of time and this standard was designed with this in mind.

The 12 VDC standard provides the following assurances:

  • Be capable of providing 5A (peak) DC current at operating voltage

  • Ensure 2% or less voltage drop over 5 meters of cable length at peak load

  • Providing battery safe charging (i.e. over/under voltage protection)

  • Providing fused or otherwise current protected outputs from power sources

Instruments connecting to 12 VDC field power should conform to the automotive industry operating standards at minimum:

  • Operate down to 11 VDC or better

  • Operate on 12 VDC nominal voltage

  • Operate up to 14.3 VDC or better

  • Tolerate a maximum continuous overvoltage of 16 VDC or better

  • Tolerate a maximum dynamic overvoltage of 20 VDC or better

Power Connectors

Instrument power connections use a 4-pin PT series Amphenol Industrial connector of shell size 12. Common connectors and the pinout are listed below.

Pin Description
A Positive
B Not Connected
C Negative
D Not Connected
Leeman Geo P/N Amphenol P/N Description
1-0001497 PT06E-12-4S(SR) Wire connector that connects to a FieldVolt ready instrument power input
1-0001496 PT06E-12-4P(SR) Wire connector that connects to a FieldVolt power source power output
1-0001495 PT02A-12-4S Panel mounted connector that would be used as a FieldVolt power source power output
1-0001510 PT02A-12-4P Panel mounted connector that would be used as a FieldVolt ready instrument power input
1-0001504 PT01E12-4S(SR) Wire mounted connector that would be used as a FieldVolt power source power output

Charging Connectors

Charging connections use a 3-pin PT series Amphenol Industrial connector of shell size 12. Common connectors and the pinout are listed below. This connector is designed to power a charge controller inside the device to be charged. There should also be a fuse or current limiting device immediately before the battery to protect both systems.

Pin Description
A Charge Controller Positive
B Negative
C Not Connected
Leeman Geo P/N Amphenol P/N Description
1-0000963 PT06E-12-3S(SR) Wire connector for charging source such as a solar panel, AC adapter, etc.
1-0001592 PT01E12-3P-SR Wire connector for charging receiver such as solar charge controller
1-0001494 PT02A-12-3P Panel mounted connector to receive charging source

Future

As the need for alternative voltage systems arises (high voltage DC downhole systems for example), more connectors will be added to the standard. These connectors shall not allow instruments which may be damaged by the different voltages to be connected. Size, shell orientation, or other manufacturer supported variations may be used to assure this. The connectors and standards will not be established until deemed necessary in an effort to keep the standard compact, easy to understand, and only containing necessary information.

Revision History

Date Revision
March 17 2024 Initial Release