• Combines a mA loop calibrator with a full-featured True RMS multimeter in one package
• Source/Measure/Simulate 0-20 mA and 4-20 mA DC current
• Simultaneously monitor mA and % of scale
• Built-in 24 V loop power supply for testing process transmitters without an external supply
• DCV, ACV, AC+DC, DCI, ACI, resistance, frequency, continuity, diode test measurements

The 394B Process Multimeter combines the capabilities of a mA loop calibrator with a full-featured True RMS multimeter in one package.

A Dedicated mA loop calibrator function provides technicians and electricians with the tools required for testing and troubleshooting current loop applications in process control systems. Source and simulate industry standard 0-20 mA and 4-20 mA control loops using the adjustable DC current output.

Additionally, the 394B serves as a general-purpose multimeter delivering the performance required for evaluating a wide range of electronics and electrical systems.

Dedicated mA loop calibrator functions provide technicians and electricians with the tools required for testing and troubleshooting current loop applications in process control systems. Source and simulate industry standard 0-20 mA and 4-20 mA control loops using the adjustable DC current output. To evaluate process transmitters, the built-in power supply outputs 24 V while measuring the signal drive current displayed in mA and % of scale.

The auto DC current output mode actions are shown in the table below.

PC software can log measurement data at specified intervals with date and time stamps. Log up to 100,000 data points in graph or table format. Measurement data recorded in the field can be exported using the software for analysis.

This easy-to-read display helps identify measurement trends or fluctuating signals. When working in low-light environments, the auto on/off backlight adjusts for best visibility while maximizing battery life.

Dual line display capabilities enable two measurements or one measurement and a math function to appear on screen simultaneously.

The 390B series is equipped with an AC LPF (low-pass filter) to help reduce unwanted electronic noise when measuring AC voltage or AC frequency. The LPF can improve measurement performance on composite sine waves that are typically generated by inverters and variable frequency drives.

Set up the multimeter to measure AC voltage. Press the HFR button to enable the LPF. The multimeter will continue measuring in the chosen AC mode, but now the signal diverts through a filter that blocks voltages above 800 Hz.