The Keysight U1242B is a robust 4-digit handheld digital multimeter designed for comprehensive diagnostics and maintenance in electrical and electronic systems. It offers a 10,000-count dual display for detailed readings and true RMS measurements for accurate AC signal analysis. The U1242B integrates advanced troubleshooting features such as a switch counter for detecting intermittent failures in relays and switches, a harmonic ratio function to identify harmonics in AC supplies, and dual/differential temperature measurement capabilities for HVAC system analysis. Enhanced by adjustable dual-intensity backlighting for visibility in various lighting conditions and a ruggedized overmold casing for durability, this multimeter is engineered for field use. Connectivity options include IR-to-USB for PC data transfer and an optional Bluetooth adapter for wireless communication. Its overvoltage protection rating of CAT III 1000V and CAT IV 600V ensures user safety in demanding environments.
### Technical Specifications
**General Features:**
* **Display:** 4-digit, 10,000-count dual display
* **Measurement Type:** True RMS for AC voltage and current
* **Backlighting:** Adjustable dual-intensity backlight
* **Data Logging:** Manual data logging, stores up to 200 readings
* **Durability:** Overmold body casing, certified to IP67 protection
* **Power:** Long battery life up to 300 hours
**Electrical Measurements:**
* **DC Voltage:**
* Ranges: 1000 mV to 1000 V
* Accuracy: 0.09% + 5
* **AC Voltage:**
* Ranges: 1000 mV to 1000 V
* Accuracy: 0.2% + 5 (Note: some sources list 2% + 5 for AC voltage range, but 0.2% is a more common precision spec for ACV in similar models. Confirming exact spec is recommended.)
* **DC Current:**
* Ranges: 1000 µA to 10 A
* Accuracy: 0.1% + 3
* **AC Current:**
* Ranges: 1000 µA to 10 A
* Accuracy: 1% + 5
* **Resistance:**
* Range: Up to 100 MΩ
* **Frequency:**
* Range: Up to 200 kHz
* **Capacitance:**
* Range: Up to 10 mF
* **Diode Test:** Yes
* **Continuity Test:** With audible beeper and visual (flashing backlight) alerts
**Advanced Functions:**
* **Switch Counter:** For detecting intermittent failures in switches or relays
* **Harmonic Ratio:** For analyzing harmonics in AC signals
* **Temperature Measurement:**
* J & K-Type thermocouple support
* Dual and differential temperature capabilities
* Ambient temperature display with each measurement
* Scanning temperature measurement (U1242B only)
* **VFD Troubleshooting:** Built-in low pass filter
* **MIN/MAX/AVG Recording:** Yes
* **Data Hold:** Auto-hold and manual data hold
* **Null (Relative) Function:** Yes
**Electrical Interface & Safety:**
* **Overvoltage Protection:** CAT III 1000 V, CAT IV 600 V
* **Fuse Protection:** 30 kA/fast-acting fuse for 11 A range
* **Connectivity:**
* IR-to-USB for PC connectivity
* Optional IR-to-Bluetooth adapter for wireless connectivity
**Physical Characteristics:**
* **Dimensions:** Not specified in research materials.
* **Weight:** Not specified in research materials.
* **Ingress Protection:** Certified to IP67
* **Operating Environment:** Designed for indoor use, low condensation areas
**Included Accessories:**
* Test Lead Set
* Quick Start Guide
* 4 x 1.5 V Batteries
* Certificate of Calibration
### Why Choose Aumictech for Keysight U1242B?
At Aumictech, we specialize in supplying high-end electronic test and measurement equipment. Whether you need the Keysight U1242B for intricate diagnostics, robust field maintenance, or advanced laboratory analysis, our team ensures that this versatile multimeter delivers maximum performance and reliability for your critical applications.
