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Sophisticated design and troubleshooting
Advanced digital multimeters (DMMs) go beyond our Essential models, offering 6.5- and 7.5-digit resolution for enhanced accuracy, reduced noise, and minimized measurement errors. These DMMs feature improved triggering and digitizing capabilities, with a sampling rate of up to 50k samples per second to measure fast-changing signals like a clock pulse in a high-frequency circuit or an unwanted transient noise signal. Choose from our popular configurations or customize one to meet your specific application needs. Need help selecting? Check out the resources below.
Fast reading rate
Provides real-time measurements to detect voltage fluctuations, unstable signals, or current irregularities, which are indicators of faults or performance problems.
Low current measurement
Analyze dynamic current consumption of low-power devices with 1 microamp range and picoamp resolution.
Triggering and digitizing
Enhanced triggering and digitizing features enable you to capture and isolate specific events and troubleshoot fast-changing signals.
Autocalibration
Self-calibrates regularly to reduce errors due to temperature and internal drifts, ensuring accuracy for long-duration characterization tests.
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Digits of resolution
6 ½ to 7 ½
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Basic 1-year DCV accuracy
16 ppm to 75 ppm
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Memory
1,000 readings to 2,000,000 readings
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Interface
LAN, USB, GPIB (optional)
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Maximum reading rate
300 readings/s to 50,000 readings/s
Most popular configurations
DM6-class Digital Multimeter
DM7-class Digital Multimeter
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Frequently asked questions
A fast-reading rate in a digital multimeter (DMM) is important because it directly affects how quickly and accurately you can observe changes in your measurements. The following are the key reasons why a fast-reading rate matters in a DMM:
- Captures rapid changes: A higher reading rate allows the DMM to detect and display rapid fluctuations in voltage, current, or resistance that a slower meter might miss. This is especially useful in dynamic systems or when troubleshooting intermittent issues.
- Improves responsiveness: Faster updates on the display make the meter feel more responsive. This is valuable when probing different test points quickly or tuning a circuit in real time.
- Enables better trend observation: If you're monitoring a signal over time, a fast-reading rate helps reveal trends or anomalies that could otherwise be averaged out or lost with slower sampling.
- Increases efficiency in data logging: In automated or logged measurements, a higher reading rate means more data points in less time, improving resolution and granularity in recorded datasets.
A digital multimeter can measure current (I) and voltage (V). If you have both measurements, calculating the DC power is simply multiplying both the current (I) and voltage (V) measurements. Most digital multimeters have an internal architecture that inhibits their ability to measure both at the same time. However, if you use a few techniques and the right equipment, you can get a good I and V measurement from your benchtop DMM. Here are some steps to follow:
- You need a dual measurement DMM configuration to monitor voltage and current simultaneously, or very nearly simultaneously. Keysight standard DMMs have dual measurement configurations.
- Create a circuit using a shunt in series with the DUT and the DMM. Make sure the shunt is very low resistance but can withstand a reasonable amount of wattage.
- Measure the voltage across the DUT with your DMM, which is, say, the DCV1 input.
- Measure the voltage across the shunt with your DMM’s other DCV2 input. Using Ohm's law, calculate the current value from the voltage measured and the shunt resistance value.
- The power can then be calculated by multiplying the DCV1 value and the DCV2 current value from the previous step.
Modern digital multimeters also have a frequency or period measurement function. This function normally measures the frequency of an AC signal or any type of periodic signal. Usually, it measures how fast a motor is spinning, where the frequency you measure becomes revolutions per minute (RPM).
Other applications are troubleshooting electronic boards, such as verifying whether the oscillator circuit or audio circuits are functioning properly. In installations and machines, portable DMMs are used to check AC mains frequency, motors, and variable-frequency drive circuits.