Fluke BT521
Updated 2026-10-27
Specifications
Figures as the manufacturer states them on its product page or datasheet; each row links its data record.
- Current with clamp
- 400 A range with the i410 clamp, 1 A resolution, 3.5% + 2
- Dc voltage ranges
- 6 V, 60 V, 600 V and 1000 V ranges; 0.09% + 5
- Ingress protection
- IP40
- Measurement category
- 600 V CAT III
- Operating temperature
- 0 °C to 40 °C
- Resistance ranges
- 3 mΩ, 30 mΩ, 300 mΩ and 3000 mΩ ranges; 0.001 mΩ resolution in the 3 mΩ range; 1% + 8 (3 mΩ range) and 0.8% + 6 (other ranges)
- Temperature
- 0 °C to 60 °C, 1 °C resolution, 2 °C (4 °F)
- Weight
- 850 g
Data records
- The manufacturer's page for the BT521 was read on the date given in the value. Value: 2026-10-27.
- Fluke lists the BT521 as a battery analyzer of its 500 Series, supplied with a test probe set that measures temperature. Value: battery impedance tester.
- The BT521 measures the internal resistance of a battery.
- The BT521 reads the temperature of the negative battery post with the infrared sensor in its test probe and stores the reading with each test.
- The BT521 tests battery strings in a sequence mode that stores voltage, resistance and temperature for each battery automatically.
- The BT521 holds up to ten threshold sets and marks each result as pass, warn or fail.
- The BT521 measures DC and AC voltage, DC and AC current with the included clamp, ripple voltage and frequency.
- The BT521 communicates wirelessly with the Fluke BA Mobile app, and results can be reviewed on the instrument before download to the FlukeView Battery Management Software.
- The BT521 is a product of Fluke. Value: Fluke.
- The manufacturer gives the model designation as BT521. Value: BT521.
- Fluke presents the BT521 on a product page shared with the other two models of its 500 Series on its own website, which is the page cited for this entry.
- The manufacturer states an AC voltage range for the BT521 with its resolution, accuracy and frequency band. Value: 600 V range, 0.1 V resolution, 2% + 10, 45 Hz to 500 Hz with 800 Hz filter.
- The manufacturer states the battery pack of the BT521 and a continuous operating time. Value: BP500 lithium-ion, 7.4 V 3000 mAh; more than eight hours continuous operation.
- The manufacturer states a DC and AC current range for the BT521 with the included clamp. Value: 400 A range with the i410 clamp, 1 A resolution, 3.5% + 2.
- The manufacturer states the DC voltage ranges of the BT521 and their accuracy. Value: 6 V, 60 V, 600 V and 1000 V ranges; 0.09% + 5.
- The manufacturer states an ingress protection rating for the BT521. Value: IP40.
- The manufacturer states a measurement category rating for the BT521. Value: 600 V CAT III.
- The manufacturer states an operating temperature range for the BT521. Value: 0 °C to 40 °C.
- The manufacturer states four battery resistance ranges for the BT521 with the resolution of the lowest range and the accuracy of each. Value: 3 mΩ, 30 mΩ, 300 mΩ and 3000 mΩ ranges; 0.001 mΩ resolution in the 3 mΩ range; 1% + 8 (3 mΩ range) and 0.8% + 6 (other ranges).
- The manufacturer states a temperature measurement range for the BT521 with its resolution and accuracy. Value: 0 °C to 60 °C, 1 °C resolution, 2 °C (4 °F).
- The manufacturer states a weight for the BT521. Value: 850 g.
- The product page lists UN38.3, UL2054 and IEC 62133 under battery compliance for the lithium-ion battery pack of the BT521; the page gives no edition. Value: UN38.3, UL2054, IEC62133.
- The product page names IEC 61326 as the electromagnetic compatibility standard for the BT521; the page gives no part or edition. Value: IEC 61326.
- The product page names MIL-PRF-28800 Class 2 as the vibration requirement for the BT521; the value gives the revision as the page writes it. Value: MIL-PRF-28800F: Class 2.
- The catalog name of the model is written Fluke BT521. Value: Fluke BT521.
Sources
- Fluke product page, Battery Analyzer | Battery Impedance Tester | BT521 | BT520 | BT510 | Fluke, web page edition, Fluke. Held as: Public page. Publisher page
Changelog (53 entries)
| Date | Revision | Change |
|---|---|---|
| 2026-10-27 | created (prod.fluke-bt521.checked) | |
| 2026-10-27 | review_status unreviewed -> software_reviewed (prod.fluke-bt521.checked) | |
| 2026-10-27 | created (prod.fluke-bt521.class) | |
| 2026-10-27 | review_status unreviewed -> software_reviewed (prod.fluke-bt521.class) | |
| 2026-10-27 | created (prod.fluke-bt521.function.internal-resistance) | |
| 2026-10-27 | review_status unreviewed -> software_reviewed (prod.fluke-bt521.function.internal-resistance) | |
| 2026-10-27 | created (prod.fluke-bt521.function.post-temperature) | |
| 2026-10-27 | review_status unreviewed -> software_reviewed (prod.fluke-bt521.function.post-temperature) | |
| 2026-10-27 | created (prod.fluke-bt521.function.sequence-mode) | |
| 2026-10-27 | review_status unreviewed -> software_reviewed (prod.fluke-bt521.function.sequence-mode) | |
| 2026-10-27 | created (prod.fluke-bt521.function.threshold-sets) | |
| 2026-10-27 | review_status unreviewed -> software_reviewed (prod.fluke-bt521.function.threshold-sets) | |
| 2026-10-27 | created (prod.fluke-bt521.function.voltage-current-ripple) | |
| 2026-10-27 | review_status unreviewed -> software_reviewed (prod.fluke-bt521.function.voltage-current-ripple) | |
| 2026-10-27 | created (prod.fluke-bt521.function.wireless-app) | |
| 2026-10-27 | review_status unreviewed -> software_reviewed (prod.fluke-bt521.function.wireless-app) | |
| 2026-10-27 | created (prod.fluke-bt521.manufacturer) | |
| 2026-10-27 | review_status unreviewed -> software_reviewed (prod.fluke-bt521.manufacturer) | |
| 2026-10-27 | created (prod.fluke-bt521.model) | |
| 2026-10-27 | review_status unreviewed -> software_reviewed (prod.fluke-bt521.model) | |
| 2026-10-27 | created (prod.fluke-bt521.product-page) | |
| 2026-10-27 | review_status unreviewed -> software_reviewed (prod.fluke-bt521.product-page) | |
| 2026-10-27 | created (prod.fluke-bt521.spec.ac-voltage) | |
| 2026-10-27 | review_status unreviewed -> software_reviewed (prod.fluke-bt521.spec.ac-voltage) | |
| 2026-10-27 | created (prod.fluke-bt521.spec.battery) | |
| 2026-10-27 | review_status unreviewed -> software_reviewed (prod.fluke-bt521.spec.battery) | |
| 2026-10-27 | created (prod.fluke-bt521.spec.current-with-clamp) | |
| 2026-10-27 | review_status unreviewed -> software_reviewed (prod.fluke-bt521.spec.current-with-clamp) | |
| 2026-10-27 | created (prod.fluke-bt521.spec.dc-voltage-ranges) | |
| 2026-10-27 | review_status unreviewed -> software_reviewed (prod.fluke-bt521.spec.dc-voltage-ranges) | |
| 2026-10-27 | created (prod.fluke-bt521.spec.ingress-protection) | |
| 2026-10-27 | review_status unreviewed -> software_reviewed (prod.fluke-bt521.spec.ingress-protection) | |
| 2026-10-27 | created (prod.fluke-bt521.spec.measurement-category) | |
| 2026-10-27 | review_status unreviewed -> software_reviewed (prod.fluke-bt521.spec.measurement-category) | |
| 2026-10-27 | created (prod.fluke-bt521.spec.operating-temperature) | |
| 2026-10-27 | review_status unreviewed -> software_reviewed (prod.fluke-bt521.spec.operating-temperature) | |
| 2026-10-27 | created (prod.fluke-bt521.spec.resistance-ranges) | |
| 2026-10-27 | review_status unreviewed -> software_reviewed (prod.fluke-bt521.spec.resistance-ranges) | |
| 2026-10-27 | created (prod.fluke-bt521.spec.temperature) | |
| 2026-10-27 | review_status unreviewed -> software_reviewed (prod.fluke-bt521.spec.temperature) | |
| 2026-10-27 | created (prod.fluke-bt521.spec.weight) | |
| 2026-10-27 | review_status unreviewed -> software_reviewed (prod.fluke-bt521.spec.weight) | |
| 2026-10-27 | created (prod.fluke-bt521.standard.battery-pack-standards) | |
| 2026-10-27 | revised (prod.fluke-bt521.standard.battery-pack-standards) | |
| 2026-10-27 | review_status unreviewed -> software_reviewed (prod.fluke-bt521.standard.battery-pack-standards) | |
| 2026-10-27 | created (prod.fluke-bt521.standard.iec-61326) | |
| 2026-10-27 | review_status unreviewed -> software_reviewed (prod.fluke-bt521.standard.iec-61326) | |
| 2026-10-27 | created (prod.fluke-bt521.standard.mil-prf-28800) | |
| 2026-10-27 | revised (prod.fluke-bt521.standard.mil-prf-28800) | |
| 2026-10-27 | revised (prod.fluke-bt521.standard.mil-prf-28800) | |
| 2026-10-27 | review_status unreviewed -> software_reviewed (prod.fluke-bt521.standard.mil-prf-28800) | |
| 2026-10-27 | created (prod.fluke-bt521.title) | |
| 2026-10-27 | review_status unreviewed -> software_reviewed (prod.fluke-bt521.title) |
Cite this page
Cite the governing standard for the fact itself; cite this page as the finding aid.
"Fluke BT521." Test Instrument Reference. 2026-10-27. https://www.testinstrumentreference.com/products/fluke-bt521/.
Test Instrument Reference, Fluke BT521 (Oct. 27, 2026), https://www.testinstrumentreference.com/products/fluke-bt521/.
@misc{etr-products-fluke-bt521,
title = {Fluke BT521},
howpublished = {\url{https://www.testinstrumentreference.com/products/fluke-bt521/}},
organization = {Test Instrument Reference},
publisher = {Test Instrument Reference},
year = {2026},
note = {last substantive change 2026-10-27}
}{{cite web |title=Fluke BT521 |website=Test Instrument Reference |publisher=Test Instrument Reference |url=https://www.testinstrumentreference.com/products/fluke-bt521/ |date=2026-10-27 |access-date=}}