Fluke Milliamp Process Clamp Meter

Description

ISA process instrumentation guidelines require regular loop calibration without disrupting active manufacturing plant control systems. The Fluke 771 Milliamp Clamp Meter measures 4-to-20 milliamp signals without breaking the loop or shutting down production processes. It measures low DC currents, requiring zeroing before clamp jaw engagement to eliminate ambient magnetic field offsets.

High-impact composite thermoplastic constructs the slim handheld meter body and detachable clamp jaw, fitted with high-sensitivity magnetic flux sensors. Two standard AA alkaline batteries power the solid-state measurement circuits, delivering forty hours of continuous milliamp testing. Total bare tool weight measures 0.57 lbs with batteries. Dimensions measure 8.3 inches long, 2.3 inches wide, and 1.4 inches deep with a 0.18-inch jaw diameter.

Key Features of Fluke 771

Process technicians buy Fluke 771 clamp meters to troubleshoot 4-20 mA loops, PLC inputs, and transmitters without lifting wires. Pricing delivers 0.2 percent accuracy and a detachable clamp probe that reaches crowded terminal cabinets.

• High-sensitivity clamp jaws measure 4-to-20 mA process loop signals without breaking circuits or halting operations.
• Best-in-class 0.2 percent accuracy resolves micro-amp current changes down to 0.01 milliamps on control loops.
• Detachable clamp probe heads connect via extension cables to reach cramped wires behind terminal strips.
• Dual backlit display screens show both milliamp value and percentage of four-to-twenty milliamp span simultaneously.
• Built-in measurement spotlights illuminate dark control cabinets and unlit instrumentation marshaling racks.
• Hold functions capture changing measurements on screen when probing wires in difficult line-of-sight locations.
• Automatic battery saver shutoff circuits preserve battery power after fifteen minutes of inactive standby.

Milliamp Measurement Linearity Bench Metrics

Calibration bench testing using precision DC current sources confirms measurement accuracy within 0.2 percent plus five counts from 0.01 mA to 24.0 mA. Across extended ranges up to 100 mA, linearity holds within one percent reading error. Zero offset null circuits eliminate residual magnetic hysteresis down to five micro-amps after thumbwheel push-button zeroing. The detachable clamp head maintains calibrated accuracy through five-foot drop tests onto concrete. Battery voltage drop circuits maintain calibration down to 1.8 volts without measurement drift.

Control Panel Usability Realities Maintenance

Slipping the ultra-narrow 0.18-inch clamp jaw over crowded PLC wires takes one hand, pressing the zero button before clamping conductors. Unsnapping the probe head from the meter body allows viewing readings away from wire bundles. Do not buy this meter for AC power currents over 100 mA, high-voltage busbars, or bare conductors over 0.18 inches.

• Wipe oil, dust, and terminal cabinet grime off the clamp jaw faces with clean dry wipes after each shift.
• Inspect the jaw magnetic mating faces for dirt flecks that cause zero drift errors once each week.
• Send the instrument to certified calibration laboratories for annual verification every twelve months.

Factory Warranty Manifest Inclusions

Fluke covers this milliamp process clamp meter with a 3-Year limited manufacturer warranty against defects in materials and electronic components. The factory package contains the Fluke 771 meter, detachable clamp probe, two AA alkaline batteries, soft carrying case, and an illustrated process loop troubleshooting manual.