Fluke 8508A

3458/HFL

 

 

 

8508A vs 3458/HFL

 

 

 

 

 

 

Functional & Versatility

 

 

 

 

Comments

 

Parameters

 

 

 

 

 

 

 

 

 

 

 

8508A maintains >10Gohm input impedance

 

Full Scale (dc & ac Voltage)

200mV, 2V, 20V, 200V, 1050Vrms

120mV, 1.2V, 12V, 120V,

 

to 20Vdc. This compares with 12V on

 

 

3458/HFL. The 8508A 1050Vrms

 

1050Vdc (ac = 700Vrms)

 

 

 

 

 

 

measurement is often used to calibrate

 

 

 

 

 

 

 

 

 

 

 

 

calibrators at 1000 Vrms output.

 

 

 

 

 

 

3458A/HFL has lower current ranges with a

 

 

 

 

 

 

sensitivity of 1pA compared with 10pA on

 

 

 

 

 

 

the 8508A – the 3458/HFL datasheet does

 

 

 

 

 

 

state that lower ranges have ‘typical’

 

 

 

200uA, 2mA, 20mA, 200mA, 2A &

100nA, 1uA, 120uA, 1.2mA,

 

uncertainty only. 8508A states typical above

 

Full Scale (dc & ac current)

 

 

10kHz and 2GOhm for resistance.

 

 

20A

12mA, 120mA, 1.05A

 

 

 

 

 

 

 

 

 

 

 

 

A 20Amp range on the 8508A improves

 

 

 

 

 

 

calibration of Multi-product calibrators. This

 

 

 

 

 

 

reduces the need for additional external

 

 

 

 

 

 

shunts.

 

 

 

 

 

 

A DMM with 10 MOhm input impedance is

 

 

 

 

 

 

generally not useful for precision ac

 

 

 

 

AC Voltage - 1MHz (1%)

 

measurement above 1MHz. A 50 Ohm

 

AC Measurement

 

AC Voltage - 1MHz (2%)

 

termination at these frequencies is more

 

 

AC Voltage - 10MHz (15%)

 

 

(Bandwidth)

 

AC Current - 100kHz (0.4%)

 

desirable.

 

 

AC Current - 100kHz (0.7%

 

 

 

 

 

 

The 8508A high frequency Current

 

 

 

 

Typical)

 

 

 

 

 

 

uncertainty will help maintain good TURs

 

 

 

 

 

 

 

 

 

 

 

 

when calibrating Multi-Product calibrators.

 

 

 

2Ω, 20Ω, 200Ω, 2kΩ, 20kΩ,

12Ω, 120Ω, 1.2kΩ, 12kΩ,

 

8508A has a wide resistance measurement

 

Full Scale (Resistance)

 

 

range. 8508A measurement resolution of

 

 

200kΩ, 2MΩ, 20MΩ, 200M,

120kΩ, 1.2MΩ, 12MΩ,

 

 

 

 

10nthis compares with 10uon

 

 

 

2GΩ, 20GΩ (eleven ranges)

120MΩ, 1.2GΩ (nine ranges)

 

 

 

 

 

3458/HFL

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Errors due to self-heating within the resistor

 

 

 

Selectable excitation current -

Fixed excitation current -

 

under test are minimized when the

 

200 Ohm Resistance Range.

 

 

multimeter low excitation current is

 

 

10mA & 1mA

10mA

 

 

 

 

 

maintained. Use in conjunction with RTD or

 

 

 

 

 

 

 

 

 

 

 

 

low resistance measurements.

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Fluke specifications Fluke 8508A 3458/HFL

8508A, 3458/HFL specifications

The Fluke 3458A and the Fluke 8508A are high-precision digital multimeters (DMM) designed for the most demanding applications in electrical measurement. Both of these instruments provide a plethora of features that make them indispensable tools for engineers, laboratories, and research institutions.

The Fluke 3458A is well-known for its exceptional accuracy and stability. It boasts a 7.5-digit display, offering an impressive resolution of 1 nV for voltage and 1 nA for current measurements. With an accuracy specification of 0.0005%, it can handle both AC and DC measurements with ease, making it suitable for calibrating other instruments and for use in environments where precision is crucial.

One of its standout features is its ability to perform automated measurements through a built-in interface. This feature is particularly useful in laboratory settings where repetitive measurements are common. It supports a variety of communication protocols such as USB, GPIB, and LAN, allowing seamless integration into automated test setups.

The Fluke 8508A, on the other hand, is renowned for its advanced measurement capabilities, including a high input impedance of 10 GΩ. This feature minimizes loading effects on circuits being tested, ensuring accuracy. The 8508A also provides extensive support for data logging, enabling users to capture trends over time.

With 9 different measurement functions, including resistance, capacitance, and frequency, the 8508A is versatile enough to address a wide array of testing needs. Its long-term stability is backed by a high-quality internal reference, ensuring reliable measurements over extended periods.

Both multimeters utilize cutting-edge A/D conversion technologies, such as dual-slope conversion for DC measurements, which significantly enhances accuracy and reduces noise. Furthermore, they are built with robust hardware that ensures durability, making them suitable for both laboratory and field applications.

In summary, the Fluke 3458A and Fluke 8508A DMMs are designed for high-precision measurement tasks. Their advanced features, exceptional accuracy, and innovative technologies make them leaders in the field of electrical metrology. Engineers and researchers can rely on these instruments for their measurement needs, confident in the quality and consistency they provide. Whether used in calibration labs or in complex scientific investigations, these DMMs represent the pinnacle of electrical measurement technology.