# Fluke 5725A Amplifier for 5700A/5720A Calibrators (Pre-Owned) # Fluke 5725A Amplifier for 5700A/5720A Calibrators (Pre-Owned) ## Key Features At A Glance - Multifunction calibration covering DC voltage, AC voltage, DC current, AC current, and resistance from a single instrument - DC voltage output from 0 V to 1100 V across six ranges (220 mV, 2.2 V, 11 V, 22 V, 220 V, 1100 V) - AC voltage output to 1100 V with frequency coverage from 10 Hz to 1 MHz across multiple ranges - Characterized resistance values from 0 Ω to 100 MΩ with four-wire connections (two-wire compensation available below 100 kΩ) - DC and AC current ranges from 220 μA to 2.2 A; extendable to 11 A with the companion 5725A Amplifier - IEEE-488, RS-232, phase lock input (BNC), and phase reference output (BNC) standard for automated calibration system integration - Optional 5700A-03 Wideband AC Voltage option extends coverage to 30 MHz for wideband calibration applications - Specifications stated at both 99% and 95% confidence levels; absolute uncertainty specified to one year The Fluke 5720A Series II is a high-performance multifunction calibrator designed to serve as a primary reference standard in calibration laboratories. From a single instrument, the 5720A sources traceable DC voltage, AC voltage, DC current, AC current, and resistance — the five core electrical quantities that calibration labs must deliver to verify and adjust a wide range of measurement instruments. The companion 5700A Series II shares the same architecture at a slightly relaxed specification tier, and both calibrators interface with the 5725A Amplifier for extended voltage and current capability. Calibration laboratories use the 5720A as the source standard for verifying digital multimeters, transfer standards, and other precision measurement instruments against traceable references. The instrument's DC voltage range from 0 V to 1100 V, AC voltage range to 1100 V with frequency coverage from 10 Hz to 1 MHz, characterized resistance values from 0 Ω to 100 MΩ, and DC/AC current ranges from microamps to 2.2 A directly support the calibration workflows that DMM and meter manufacturers, regulated-industry quality systems, and metrology labs perform routinely. The IEEE-488 and RS-232 interfaces support integration into automated calibration software environments such as MET/CAL Plus. ## Brand Heritage Fluke Corporation has been a leading manufacturer of precision electronic test and measurement instruments since 1948. Fluke acquired the Philips Test & Measurement product line in the 1990s and was itself acquired by Danaher Corporation; in 2016 Danaher spun off its industrial businesses as Fortive Corporation, where Fluke continues today alongside Tektronix and Keithley as sibling brands. ## Compare Other Models in This Series The 5700A/5720A Series II family consists of two multifunction calibrators sharing the same architecture and feature set, with the 5720A specified to tighter absolute uncertainty across DC voltage, AC voltage, resistance, and current functions. Both calibrators support the same range coverage, the same IEEE-488 and RS-232 interfaces, and the same 5725A Amplifier extension. The performance difference between the two models is in the published uncertainty specifications — a customer selecting between them is choosing measurement tier, not capability. Both calibrators are bench-format instruments occupying standard 19-inch rack space (17.8 cm height, 43.2 cm width, 63 cm depth). The optional 5700A-03 Wideband AC Voltage option is compatible with both models. Selection between the 5700A Series II and the 5720A typically follows the customer's required measurement uncertainty budget and the specifications of the instruments being calibrated. Each pre-owned model in this family is listed on its own dedicated product page with condition-matched pricing. The 5700A Series II and the 5720A are commercially distinct instruments; review the spec table below to confirm which model's uncertainty tier matches the calibration workload. The 5720A is the higher-performance tier within the family, specified to tighter absolute uncertainty across DC voltage, AC voltage, and resistance compared to the 5700A Series II. On the 2.2 V DC range at 1 year and 99% confidence, the 5720A is specified at ±(6 ppm + 0.8 μV) versus ±(8 ppm + 1.2 μV) for the 5700A Series II; comparable margins apply across other ranges and functions. Calibration labs with the tightest measurement uncertainty requirements typically specify the 5720A for that reason. The primary difference between the 5700A Series II and the 5720A is published uncertainty across the shared range structure. Both calibrators cover the same voltage, current, and resistance ranges with the same interfaces and the same accessory and amplifier compatibility. The 5720A's tighter specifications make it the choice when the calibration uncertainty budget for the unit under test demands the lower number; the 5700A Series II covers the same applications at slightly relaxed specifications. Both calibrators interface with the 5725A Amplifier for extended high-voltage and high-current output, and both support the optional 5700A-03 Wideband AC Voltage option for 30 MHz wideband coverage. See the comparison table below for specification-by-specification details. Model DC Voltage Uncertainty (1 Year) DC Voltage Range Resistance Range **5725A** — 1100 V (extends host calibrator) — 5720A ±(4 ppm + 3 µV) on 11 V range (99% CL) 0 to ±1100 V 0 Ω to 100 MΩ 5700A ±(7 ppm + 3.5 µV) on 11 V range (99% CL) 0 to ±1100 V 0 Ω to 100 MΩ Additional differences in specifications beyond the few shown above are not listed here — see each model's full specifications below. ## Product Core & Specifications Specification Value 5725A Amplifier — AC Voltage 1100 V range, 40 Hz–1 kHz, 1 Year ±(90 ppm + 4 mV) 1100 V range, 1 kHz–20 kHz, 1 Year ±(165 ppm + 6 mV) 1100 V range, 20 kHz–30 kHz, 1 Year ±(600 ppm + 11 mV) 750 V range, 30 kHz–50 kHz, 1 Year ±(600 ppm + 11 mV) 750 V range, 50 kHz–100 kHz, 1 Year ±(2300 ppm + 45 mV) 5725A Amplifier — AC Current 11 A, 40 Hz–1 kHz, 1 Year ±(460 ppm + 170 µA) 11 A, 1 kHz–5 kHz, 1 Year ±(950 ppm + 380 µA) 11 A, 5 kHz–10 kHz, 1 Year ±(3600 ppm + 750 µA) 5725A Amplifier — DC Current 11 A, 1 Year ±(360 ppm + 480 µA) Load Limits (1100 V) 40 Hz–5 kHz 50 mA, 1000 pF 5 kHz–30 kHz 70 mA, 300 pF 30 kHz–100 kHz 70 mA (0 °C to 40 °C), 150 pF General Maximum Power 750 VA Height 13.3 cm (5.25 in) Width and Depth Same as 5700A/5720A; both units project 5.1 cm (2 in) from rack front Weight 32 kg (70 lb) **Important:** Calibrating the 5720A Series II to full specified absolute uncertainty requires external standards including a 732B 10 V DC voltage reference, a 742A-1 (1 Ω) resistance standard, and a 742A-10k (10 kΩ) resistance standard, each meeting the uncertainty limits stated in the datasheet.**Important:** Fluke guarantees performance verification using specifications stated to 99% confidence level.**Important:** DC Zeros calibration is required every 30 days.**Important:** Calibrating the 5700A Series II and 5720A to full specified absolute uncertainty requires external standards: Fluke 732B (10 V, ±1.5 ppm), 742A-1 (1 Ω, ±10 ppm), and 742A-10k (10 kΩ, ±4 ppm). These standards are not included with the calibrator and must be procured separately.**Important:** Low-Thermal Test Leads (5440A-7002 banana plug or 5440A-7003 spade lug) are listed as accessories and are not included with the base calibrator; the appropriate set must be ordered separately.**Important:** Maximum output from the calibrator's terminals is 2.2 A. Uncertainty specifications for 220 µA and 2.2 mA ranges are increased by a factor of 1.3 when supplied through 5725A terminals.**Important:** 5700A/5720A combined with 5220A is not specified for inductive loads.**Important:** Maximum AC output 250 V from 15–50 Hz on the 1100 V range.**Important:** Wideband AC Voltage (Option 5700-03) specifications apply to the end of the cable and 50 Ω termination used for calibration.Recommended pairing: the 5725A Amplifier extends the 5720A's voltage capability to 1100 V at higher currents and adds AC current output to 11 A, addressing calibration workloads that exceed the calibrator's internal compliance limits. ## About this used unit - Warranty included - Functional verification included - Standard Calibration Upgrade Options: No Calibration Required, NIST Traceable, Z540.1 or ISO 17025 with Data, Z540.3 Guardbanding with Data. - Note that unnecessary accessories may not be included (contact Test Architect to confirm). **Please review the Manufacturer's Data Sheet to verify published specifications. Feedback on this webpage is always welcome — please reach out to your Test Architect at any time for questions or concerns. Thank you, we truly appreciate you being our customer.** ## Details - **Price:** 0.0 USD - **Vendor:** Fluke - **Type:** Calibrator - **Tags:** Amplifier, Fluke, Manufacturers, Other, Other Equipment, product_manual_group_1, Product_used ## Variants | Variant | Price | Available | |---------|-------|-----------| | None | 0.00 USD | In stock | | NIST Traceable | 0.00 USD | In stock | | NIST Traceable with Full Data | 0.00 USD | In stock | | ISO IEC 17025 Accredited | 0.00 USD | In stock | ## Images - Fluke 5725A Amplifier for 5700A/5720A Calibrators (Pre-Owned) --- > Source: [ValueTronics](https://valuetronics.com/products/5725a-fluke-calibration-amplifier-used) > Updated: 2026-05-30