Making Measurements

The following are some tips for measuring voltage:

When you measure voltage, the meter acts approximately like a 10 MΩ (10,000,000 Ω) impedance in parallel with the circuit. This loading effect can cause measurement errors in high- impedance circuits. In most cases, the error is

negligible (0.1% or less) if the circuit impedance is 10 kΩ (10,000 Ω) or less.

For better accuracy when measuring the dc offset of an ac voltage, measure the ac voltage first. Note the ac voltage range, then manually select a dc voltage range equal to or higher than the ac range. This procedure improves the accuracy of the dc measurement by ensuring that the input protection circuits are not activated.

AC Voltage

87 III TRUE RMS MULTIMETER

 

 

MIN MAX RANGE

HOLD

Switch Box

 

 

 

REL

Hz

 

 

41/2 DIGITS

PEAK MIN MAX

 

 

 

1 Second

 

 

 

 

 

 

mV

 

 

 

 

V

 

 

mA

 

 

 

 

A

 

V

V

 

 

μA

 

OFF

 

 

 

 

 

A

mA μA COM V

 

 

 

 

 

!

 

 

 

 

400mA MAX

CAT II

 

 

10A MAX

FUSED

1000V MAX

 

 

FUSED

!

 

 

DC Voltage

 

 

 

87 III TRUE RMS MULTIMETER

 

 

 

 

MIN MAX

RANGE

HOLD

 

 

 

 

 

REL

Hz

 

 

41/2 DIGITS

PEAK MIN MAX

 

 

 

 

1 Second

 

 

 

 

 

 

 

mV

 

 

 

V

V

 

 

 

mA

 

 

 

 

A

 

V

 

 

 

μA

 

 

OFF

 

 

 

 

 

 

A

mA μA COM V

+

 

 

 

 

 

!

 

 

 

400mA MAX

CAT II

 

10A MAX

FUSED

 

1000V MAX

 

FUSED

!

 

 

 

iy2f.eps

Figure 2. Measuring AC and DC Voltage

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Fluke 80 Series III user manual Switch Box

80 Series III specifications

The Fluke 80 Series III digital multimeters are renowned for their robust engineering, precision, and versatility, making them a staple in the toolkit of electricians, engineers, and technicians. Launched by Fluke Corporation, a leading manufacturer of electronic test tools, the 80 Series III has set a benchmark in the multimeter industry for its reliability and performance.

One of the standout features of the Fluke 80 Series III is its wide measurement capabilities. The device can accurately measure AC and DC voltage, DC current, resistance, frequency, and capacitance. This comprehensive feature set allows users to tackle a variety of tasks, from simple household electrical checks to complex industrial applications. The meter's high input impedance prevents loading effects on circuits, ensuring accurate readings, especially in sensitive electronic applications.

Fluke's proprietary True-RMS technology is another defining characteristic of the 80 Series III. This technology ensures that the multimeter provides accurate readings for both non-linear loads and distorted waveforms, which are common in many modern electrical systems. This capability is particularly valuable in diagnosing issues in variable frequency drives, inverters, and other electronic systems that do not present traditional sinusoidal waveforms.

Durability is a key factor in the design of the Fluke 80 Series III. The multimeter is housed in a rugged, impact-resistant case that can withstand the rigors of fieldwork. It features a built-in protective holster with a probe holder, enhancing portability while safeguarding the device against drops and bumps. Furthermore, the 80 Series III boasts an IP67 rating for dust and water resistance, ensuring reliable performance in adverse conditions.

User-friendliness is also a significant aspect of the Fluke 80 Series III. The large, easy-to-read display, combined with intuitive controls, allows users to navigate its functions with ease. The multimeter features a backlight, enabling use in dimly lit environments, while the hold function ensures that readings can be captured and displayed even after disconnecting the probes.

In addition to these features, the Fluke 80 Series III offers various models to cater to specific needs, such as the 87V for highly accurate measurements in industrial environments and the 86V for temperature measurements with added thermocouple support. Each model maintains the high standards of quality and performance that Fluke is known for.

In summary, the Fluke 80 Series III digital multimeters combine advanced features, high accuracy, and rugged durability, making them indispensable tools for professionals who require reliable performance in challenging environments. Whether for routine maintenance or complex troubleshooting, the 80 Series III offers everything necessary to meet the demands of today’s electrical tasks.