Meters
20 subcategories
Electronic test and measurement meters are fundamental instruments used to quantify electrical, RF, and optical parameters across research, development, production, and field service environments. This category encompasses diverse instrument classes designed for specific measurement domains. Key types include high-resolution Digital Multimeters (DMMs) for basic electrical parameters, LCR meters and impedance analyzers for passive component evaluation, and RF/microwave power meters for high-frequency signal characterization. Choosing the correct meter requires evaluating critical performance metrics such as measurement resolution, frequency range, channel count, and system accuracy to ensure the device meets your application requirements.
- Maximum Multimeter Resolution
- 8.5 digits (Keysight Technologies (Agilent HP) 3458A)
- High-Frequency LCR Upper Limit
- 3 GHz (Keysight Technologies (Agilent HP) E4982A)
- RF Power Meter Video Bandwidth
- 30 MHz (Keysight Technologies (Agilent HP) N1911A / N1912A)
- LCR Basic Impedance Accuracy
- 0.05% (Keysight Technologies (Agilent HP) E4980A / 4284A)
Subcategories
Digital Multimeters and Low-Level Measurement
Digital multimeters (DMMs) are categorized primarily by display resolution and measurement integrity. Standard benchtop units like the Fluke 45 provide 5-digit resolution (100,000 counts) for general testing, while precision engineering tasks often utilize 6.5-digit multimeters such as the Keysight Technologies (Agilent HP) 34401A or Keithley 2000.
For higher metrology requirements, 7.5-digit units like the Keithley 2001 employ advanced 28-bit A/D converters to maintain measurement speed without compromising resolution, whereas the industry-standard Keysight Technologies (Agilent HP) 3458A delivers up to 8.5 digits of resolution with a 0.1 ppm transfer accuracy. When evaluating extremely low-level signals, specialized instruments like the Keysight Technologies (Agilent HP) 34420A nanoVolt/micro-Ohm meter provide a highly sensitive 7.5-digit resolution with a noise floor of 1.3 nVrms to capture micro-ohm and nanovolt fluctuations accurately.
RF and Microwave Power Meters
RF and microwave power meters are designed to analyze high-frequency signals, categorizing measurements into average, peak, and peak-to-average power levels. Users can select between single-channel units, such as the Keysight Technologies (Agilent HP) E4418B, and dual-channel units like the Keysight Technologies (Agilent HP) E4419B, which facilitate simultaneous comparison of two signals. Modern modular power meter bases, including the Rohde & Schwarz NRP/NRP2, can support up to 4 simultaneous measurement channels with a system dynamic range of up to 90 dB depending on the connected sensor.
For complex modulated signals, wideband meters like the Keysight Technologies (Agilent HP) N1911A (single-channel) and Keysight Technologies (Agilent HP) N1912A (dual-channel) deliver a 30 MHz video bandwidth and a 100 MSa/s continuous sampling rate to perform statistical analysis like CCDF. High-speed testing systems may also utilize fast sampling options such as the Anritsu ML2438A, which achieves update rates exceeding 35,000 samples per second.
Impedance and Component Evaluation
LCR meters measure the inductance (L), capacitance (C), and resistance (R) of components under specific AC test frequencies. Classic benchtop units such as the Keysight Technologies (Agilent HP) 4284A and the newer Keysight Technologies (Agilent HP) E4980A provide a basic impedance accuracy of 0.05% over test frequencies up to 1 MHz and 2 MHz respectively. These meters allow users to evaluate primary and secondary parameters, including equivalent series and parallel circuit modes, quality factor (Q), and dissipation factor (D).
For high-frequency applications, specialized RF LCR meters like the Keysight Technologies (Agilent HP) E4982A extend the testing range up to 3 GHz using 1-port RF reflection techniques with a 50 Ω coaxial port interface, enabling accurate component evaluation at microwave frequencies.
Frequently asked questions
- What is the benefit of a 4-wire resistance measurement configuration?
- Instruments like the Keithley 2000 and Keithley 2750 support 4-wire resistance configurations. This method uses separate pairs of leads for source current and voltage sensing, which eliminates the test lead resistance from the measurement, ensuring highly accurate low-resistance readings.
- Can RF power meters perform statistical signal analysis?
- Yes. Peak power meters like the Keysight Technologies (Agilent HP) N1911A and Keysight Technologies (Agilent HP) N1912A feature statistical analysis capabilities, allowing them to calculate and display the Complementary Cumulative Distribution Function (CCDF) for complex modulated signals.
- Which interfaces are typically available for system integration in these meters?
- Depending on the model, integration interfaces vary. For instance, the Keithley 3706 system switch and Keysight Technologies (Agilent HP) E4980A support LAN and USB connectivity alongside traditional GPIB (IEEE-488) interfaces, allowing automated control within test software environments.