High‑Impedance Resistor Stick

The 90MΩ Resistor Stick is a simple, field‑ready way to increase a digital multimeter’s input impedance from the industry‑standard 10 MΩ up to approximately 100 MΩ. By inserting a precision 90 MΩ resistor in series with the meter, it dramatically reduces the load the meter places on sensitive circuits, helping technicians take indication‑only voltage readings with far less disturbance to the target circuit.

Used together with the Direct Current Meter (DCM) or an alternative digital multimeter, the 90MΩ Resistor Stick is particularly useful when working on delicate or high‑impedance electronics such as firing circuits, sensors and monitoring equipment where even small loading effects can change behaviour.

Key benefits

• Minimises circuit disturbance: Raises the effective input impedance of the measurement chain to around 100 MΩ, significantly reducing the current drawn from the circuit under test.
• Safer indication‑only readings: Helps limit the risk of altering the behaviour of sensitive or safety‑critical circuits while still giving the operator valuable indication of voltage levels.
• Fast, plug‑in solution: Compact stick format connects inline with the meter and test leads in seconds, with no batteries, calibration menus or complex set‑up.
• Optimised for Trimax DCM: Works seamlessly with the Trimax Direct Current Meter and is also suitable for use with most 10 MΩ digital multimeters.
• Robust and portable: Encapsulated construction and simple form factor make it easy to carry in tool rolls, EOD kits and diagnostic cases without damage.
• Supports better diagnostics: Allows engineers to compare “loaded” and “high‑impedance” readings to gain a clearer picture of circuit behaviour.

Typical applications

• Voltage indication on high‑impedance firing circuits and safety‑critical control lines.
• Diagnostic work on sensitive analogue, sensor or monitoring circuits where meter loading could affect readings.
• Training in low‑burden measurement techniques for EOD, electronics and maintenance technicians.
• Any application where you need an indication of voltage but must minimise disturbance to the circuit under test.

Why choose the 90MΩ Resistor Stick

• Purpose‑built for high‑risk diagnostics: Ideal for teams working on critical or potentially hazardous electronics where minimising circuit disturbance is essential.
• Complements Trimax diagnostic tools: Works alongside Trimax DCM, Current Shift Resistor (CSR), Resistance Duplication Tool (RDT) and other specialist diagnostic equipment.
• Supported locally: J3Seven can help integrate the 90MΩ Resistor Stick into your procedures and training for EOD, engineering and maintenance teams.
• Part of a broader capability: Available as one element in J3Seven’s wider portfolio of specialist tools for diagnostics, EOD and high‑threat technical operations.

Reduce the burden your meter places on sensitive circuits and gain safer indication‑only voltage readings. Talk to J3Seven about the 90MΩ Resistor Stick today.