Polar Toneohm 950A

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The Toneohm 950A is a powerful multilayer shorts locator designed to quickly and accurately pinpoint PCB faults, helping manufacturers, assemblers, and field engineers minimize scrap, reduce rework costs, and boost productivity. Using Polar’s innovative Vector Plane Stimulus (VPS™) technology, it pr ...Read more

Polar Toneohm 950A

Key Features :

Supports complex PCBs – works with multilayer boards, surface-mount technology, and fine-pitch designs.
Saves time – quickly locates short circuits, avoiding excessive troubleshooting.
Reduces cost and scrap – helps prevent boards from being discarded due to hard-to-find shorts.
Improves yield and quality – supports high production standards and lean manufacturing.
Minimizes rework by locating shorts efficiently, thereby reducing repair effort.
Handles multiple power and ground planes – effective where conventional tools struggle.
Capable with copper-heavy PCBs – even those with maximum copper outer layers for EMC screening.

Details
Specifications

The Toneohm 950A is a powerful multilayer shorts locator designed to quickly and accurately pinpoint PCB faults, helping manufacturers, assemblers, and field engineers minimize scrap, reduce rework costs, and boost productivity. Using Polar’s innovative Vector Plane Stimulus (VPS™) technology, it provides a simple, non-destructive way to trace shorts between power and ground planes, tracks, or components—even on complex multilayer and surface-mount boards. Ideal for both bare and loaded PCBs, the 950A makes short location faster, easier, and more reliable, ensuring higher efficiency and cost savings in electronics production and service.

Track resistance
Ranges	40mΩ, 200mΩ, 2Ω, 200Ω, 2kΩ, 20kΩ
Probe voltage	260mV maximum
Probe protection	Momentary contact up to 30V
Track voltage
Ranges	2mV, 20mV, 200mV, 2V, 20V
Input resistance	120Ω in 2mV, 20mV 1MΩ in 200mV, 2V, 20V
Probe protection	Momentary contact up to 30V
Indication	Tone in 2mV, 20mV, 200mV, 2V

Plane shorts		Drive source
Indication	Tone, uncalibrated DVM, bar-graph, and fault direction arrows.	Output voltage	0 to 500mV, (0 to 100mA into short circuit) peak. AC in Trace, DC in Volts ranges.
Sensitivity	Adjustable for differing plane resistance. Capable of detecting shorts up to 20Ω.	Protection	Protected to ± 30V
Power Requirements 90 to 264V AC, 47 to 63Hz, 0.49A max, 20VA		Approvals Conforms to applicable European Directives and is CE marked.
Accessories (standard)		Description
(950A accessories use high-reliability connectors and are incompatible with legacy Toneohm accessories)		Needle probes Current trace/drive source probe Plane probe Plane stimulus leads Lightweight headphones Online operator manual
Designed for Diagnostic purposes The 950A is designed to provide the most effective tool box for short circuit location. The ranges are indicative and no calibration is required. Ranges are designed to give the best tonal and display resolution to assist the operator in the physical location of short circuit and loading faults.