The Polar Toneohm 950 Multilayer Shorts Locator is a specialized instrument for precise identification and location of short circuits in printed circuit boards, particularly multilayer constructions. It employs Polar Instruments’ proprietary Vectored Plane Stimulus (VPS) technique to deliver non-destructive fault tracing without cutting traces or lifting components. This reduces rework time and costs in electronics manufacturing and repair environments.
Technical Specifications
Ohms – Track Resistance
• Ranges: 40mΩ (uncalibrated), 200mΩ, 2Ω, 200Ω, 2kΩ, 20kΩ
• Accuracy: ±6% (200mΩ), ±5% (2Ω and 20kΩ), ±4% (200Ω)
• Probe Voltage: 60mV maximum, 260mV maximum
• Probe Protection: ±30V; momentary contact up to 250V in 200mA and 2A ranges; up to 250V in 20V range
• Indication: Tone and meter on all ranges
Trace – Current Tracer
• Ranges: 200mA, 2A
• Accuracy: ±15% (25mΩ to 500mΩ track resistance)
• Probe Voltage: 600mV maximum
• Injection Current: 250mA maximum
• Non-contact magnetic field detection for fault location
Plane – Plane Shorts
• Vectored Plane Stimulus for track-to-plane and plane-to-plane shorts
• Sensitivity: Adjustable; detects shorts up to 20Ω
• Stimulus Output Voltage: 0 to 550mV, adjustable
• Output Current: 700mA RMS maximum
• Indication: Tone, meter, and fault direction arrows
Volts/mVolts – Track Voltage
• Ranges: 2mV, 20mV, 200mV, 2V, 20V
• Accuracy: ±5%, ±20µV (2mV/20mV); ±4%, ±15µV (20V)
• Input Resistance: 120Ω (2mV and 20mV); 1MΩ (200mV, 2V, 20V)
• Probe Protection: ±30V
General
• Display: Backlit LCD
• Audio: Pitch-varying tone for hands-free operation
• Power: 115V ±10% or 230V ±10% at 50/60Hz, 25VA
• Drive Source: AC in TRACE mode; DC in all other modes
– Key Features
• Non-destructive multilayer PCB fault detection
• Adjustable plane stimulus sensitivity for varying plane resistance
• Current tracing via non-contact magnetic field sensing
• Audible fault approach indication with variable pitch
• Multiple measurement modes for comprehensive short-circuit analysis
