- Manuals and documentation
- Exterior and user interface
- Teardown and design evaluation
- Troubleshooting and repair
- Calibration following Fluke procedure
- Direct calibration with HP 3458A
- Alternative calibration by resistor measurements
- Leakage measurements
- Python application for testing
- Conclusion and summary
This article is dedicated to Fluke 5450A decade resistance calibrator evaluation, calibration, service and performance tests.
Model 5450A Resistance Calibrator can be used to verify resistance measuring accuracy of precision DMM, ohm-meters, and other measurement equipment. Unit provides cardinal point resistance values in decade steps from 1 Ω to 100 MΩ and decade steps from 1.9 Ω to 19 MΩ. Typical accuracy is ±8 ppm. Also 4-wire Kelvin connections eliminate the effects of lead resistance. All functions and resistance switching can be controlled either from the front panel or remotely over IEEE-488 (GPIB) interface for use in automated setup.
Back in 80’s this resistance calibrator was complimenting DC Voltage calibrators, such as Model 5440B and 5442A. Later in 90’s this combination replaced by Fluke 5700/5720A series multi-function calibrators, however many design concepts and ideas from 5450A such as circuit arrangement and resistance ranges were reused from 5450A.
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Manuals and documentation
Exterior and user interface
Before we dig into the instrument itself, I’d like to point out how this box was shipped. Usually when I buy equipment from secondary market sellers just toss the gear into cardboard box, fill (if you lucky) with foam and peanuts and let the package go, hoping for the best. Few times I got damaged panels/chassis due to bad packaging.
However this time, seller from Italy went above and beyond and build nice wooden crate, with foam inside that matches 5450A nicely to reduce any risks of shipping damage. Sharing photos of the box as a result, hoping that other sellers could follow such example in future too.
Image 1-2: DIY shipping box for Fluke 5450A
Image 3-4: DIY shipping box for Fluke 5450A
Image 5-6: Fluke 5450A ready for international travel
Initial check, June 2017
|Fluke 5450A range||Calibration value 5450A||Measured 3458A-3 (Δ, ppm)||Spec, 1y|
|1 Ω||0.999604||0.99960 (-4)||±110 ppm|
|1.9 Ω||1.899486||1.89947 (-8.4)||±100 ppm|
|10 Ω||10.00065||10.00068 (+3)||±33 ppm|
|19 Ω||19.00095||19.00084 (-5.8)||±31 ppm|
|100 Ω||100.0057||100.0071 (+14)||±16 ppm|
|190 Ω||190.0141||190.0156 (+8)||±15.5 ppm|
|1000 Ω||1000.046||1000.0522 (+6)||±13.5 ppm|
|1900 Ω||1900.109||1900.123 (+7.4)||±13 ppm|
|10 KΩ||10000.57||10000.622 (+5.2)||±13 ppm|
|19 KΩ||19000.52||19000.82 (+15.8)||±12.5 ppm|
|100 KΩ||100001.2||100001.31 (+1.1)||±14 ppm|
|190 KΩ||190004.3||190003.6 (-3.6)||±13.5 ppm|
|1.0 MΩ||1.000034 MΩ||1.000009E6 (-25)||±19 ppm|
|1.9 MΩ||1.900054 MΩ||1.899893E6 (-84)||±19 ppm|
|10 MΩ||10.00016 MΩ||9.996236E6 (-392)||±50 ppm|
|19 MΩ||19.00054 MΩ||18.98499E6 (-818)||±56 ppm|
|100 MΩ||100.0301 MΩ||99.80216E6 (-2278)||±200 ppm|
Calibration, using F8508A-01 transfer to SL935
|Fluke 5450A range||Calibration value 5450A||Measured 8508A to SL935 DEVN (Δ, ppm)||Spec, 1y|
|10 KΩ||10000.57||10000.6059 () to RSTD 10 kΩ σ = 0.09 ppm||±13 ppm|
Calibration with DCC and HSB bridges, 2022
MIL 6010B, F5450A 1.9 Ω 31.6mA vs GLOL-B 0.9999985 Ω 60mA
MIL 6010B, F5450A 1.0 Ω 31.6mA vs GLOL-B 0.9999985 Ω 31.6mA
MIL 6010B, F5450A 10 Ω 5 mA vs GLOL-B 0.9999985 Ω 50mA
MIL 6010B, F5450A 10 Ω 10 mA vs GLOL-B 0.9999985 Ω 100mA
MIL 6010B, F5450A 19 Ω 10 mA vs NG9330-10 10.00039837 Ω 5.26mA
Modified: May 19, 2022, 2:03 a.m.