Tektronix DMM249 True RMS Multimeter

The Tektronix DMM249 is a handheld True RMS multimeter engineered for accurate electrical measurements in field service and benchtop environments. Its 3200-count LCD display with 65-segment analog bar graph delivers both precise digital readings and real-time trend visualization at 2 samples/second (digital) and 12 samples/second (analog). True RMS AC voltage and current measurement ensures accuracy regardless of waveform distortion.

Technical Specifications

The DMM249 operates across a 0°C to +50°C temperature range with 0% to 80% relative humidity capability. A single 9 V battery (IEC 6F22 or ANSI/NEDA 1640A) provides approximately 350 hours of typical alkaline operation, with automatic power-off at 10 minutes of inactivity. Voltage & Current Measurement

• DC Voltage: ±(0.3% of reading + 2 counts); 10 MΩ input impedance


• AC Voltage (True RMS): ±(0.3% of reading + 2 counts); 40 Hz to 1 kHz response (3 V range: 40 Hz to 300 Hz)


• Maximum input: 1000 VDC or 750 VACRMS CAT II between V and COM terminals


• Overload protection: 1100 VDC or VAC peak-to-peak; 1000 VDC or 750 VACRMS


• Input impedance: 10 MΩ paralleled by <100 pF Display & Sampling


• 3200-count LCD with 65-segment analog bar graph


• Digital sampling: 2 times/second


• Analog bar graph sampling: 12 times/second


• Automatic polarity indication with "OL" or "-OL" overrange display

Key Features Auto-ranging and data hold functions streamline field measurements. Push-to-hold capability enables single-handed operation. Shrouded safety terminals and IP54 dust and water resistance rating provide protection in harsh environments. The meter holds CAT III measurement category certification with CAT II rating for voltages up to 1000 VDC or 750 VAC. Safety certifications include UL1244, CSA231, and EN61010-1.

Typical Applications Field service technicians, maintenance personnel, and benchtop test engineers rely on the DMM249 for AC/DC voltage and current characterization, particularly in waveform-rich electrical environments where True RMS accuracy is critical.

Compatibility & Integration The meter accepts standard IEC 6F22 or ANSI/NEDA 1640A 9 V batteries. Low battery indication alerts users when voltage drops below operating threshold.