With the introduction of the 8508A, Fluke has created a new product category “the reference multimeter“ specifically for metrology applications. The 8508A Reference Multimeter draws upon decades of Fluke expertise coupled with their acquisition of Wavetek-Datron to deliver unmatched accuracy and stability; functionality and versatility; and ease of use.

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A multiple-measurement workhorse
The robust characteristics of the Fluke 8508A permit replacement of eight other measurement devices by one multi-measurement precision unit. The replaceable devices are:

• multimeter
• resistance bridge
• voltage divider
• null detector
• ac/dc transfer standard
• precision thermometer
• ac/dc shunt resistors
• electrometer/pico-ammeter

Voltage measurement
With DC and AC ranges from 200 mV to 1 kV, the 8508A covers all your voltage measurement needs. Full 8.5 digit resolution is available on all ranges to provide resolution down to 1 nV. Bandwidth for AC measurements extends to 1 MHz. Excellent linearity, coupled with Ratio measurement capability, means that the 8508A can replace Kelvin Varley dividers and AC/DC voltage transfer standards, improving your measurement efficiency in one simple, single box solution.

DC volts performance highlights

• Ranges: 5, From 200 mV to 1000 V
• Maximum Measurement: 1050 V
• Resolution: user selectable from 5.5 to 8.5 digits
• Maximum Sensitivity: 1 nV

AC volts performance highlights

• Ranges: 5, from 200 mV to 1000 V
• Resolution: user selectable from 5.5 to 6.5 digits
• Maximum Bandwidth: 1 MHz
• Maximum Sensitivity: 100 nV

Current measurements
The 8508A features a remarkable new current measurement system. For the first time, resistance at the input is virtually zero. This means that measurements can be much less invasive, and present virtually zero burden to the measurement points. It also offers the advantage that complex guarding schemes are now largely unnecessary, and measurements can be made more reliably, more repeatably and with greater confidence. Ranges from 200 ”A to 20 A and frequencies from 1 Hz to 100 kHz, again ensure that all of your measurement needs are covered including the high currents encountered when calibrating multi-function calibrators.

DC current performance highlights

• Ranges: 6, From 200 ”A to 20 A
• Maximum Measurement: 19.999999 A
• Resolution: user selectable from 5.5 to 7.5 digits
• Maximum Sensitivity: l0 pA

AC current performance highlights

• Ranges: 6, from 200 ”A to 20 A
• Resolution: user selectable from 5.5 to 6.5 digits
• Maximum Bandwidth: 100 kHz
• Maximum Sensitivity: l00 pA

Resistance measurement
With ranges from 2 W to 20 GW and resolution as low as 10 nW, the 8508A can truly be described as the ultimate resistance measurement system. Add to that a high compliance of 200 V and a high measurement current of 100 mA, and you can begin to understand how the 8508A can help extend the range of your resistance measurements. But performance of the resistance measurement system doesn’t end with just specifications. Attention to measurement technique helps further improve your results. For example, when making ratio measurements, the same current is forced through both resistances, and only the measurement is switched. Measurement current is reversible to eliminate errors due to thermal effects.

• Ranges: 10W, 2W to 20 GW
• Resolution: user selectable from 5.5 to 8.5 digits
• Maximum Sensitivity: l0 n
• Maximum Compliance Voltage: 200 V
• Maximum Measurement Current: 100 mA

Temperature measurement
To further extend your range of measurements, the 8508A offers temperature measurement through 2, 3, or 4-wire PRT’s or SPRT’s, with a temperature range from -200 ÂșC to 660 ÂșC. With simultaneous temperature and resistance readout, ITS-90 and Callendar van Dusen Linearization’s the 8508A is an ideal tool for both temperature measurement and PRT calibration applications. As with resistance, current reversal is used to remove thermal emf errors. This greater flexibility provides the means to increase the overall range of your scope of precision measurements, and to realize better uncertainty on many of the measurements you might already perform with less than ideal equipment.

• Two-wire, three-wire and four-wire Ohms with current reversal
• Range: From -200 ÂșC to 660 ÂșC
• Resolution user selectable from 5.5 to 8.5 digits
• ITS-90 linearization
• Readout: ÂșC, ÂșF, K or W

Two inputs
As well as conventional front input terminals, the 8508A can optionally be equipped with a duplicate set of rear input terminals. This can be invaluable in making ratio measurements, which are available on both voltage and resistance functions. They also provide the mechanism for forcing the same current through two resistances to improve resistance ratio measurements.