IMPEDANCE ANALYZER IM7581-01

Impedance analyzer for measurements from 100 kHz to 300 MHz with basic accuracy ±0.72% Z and ±0.41° phase, repeatability ±0.07%, typical measurement time 0.5 ms, comparator and BIN functions, USB, LAN and EXT I/O, optional RS-232C or GP-IB

-Measurement frequency: 100 kHz to 300 MHz
-Typical analog measurement time: 0.5 ms
-Basic accuracy: ±0.72% (Z, reading), ±0.41°(Phase)
-Typical repeatability: ±0.07% (e.g., 1 nH at 3 GHz)
-Test signal levels: −40.0 dBm to +7.0 dBm
Applications
-Characterization of power inductors, common-mode filters and ferrite components
-Frequency-dependent impedance analysis of components used in power electronics and noise suppression design
-Resonance and peak evaluation of inductive and filtering structures
-PASS/FAIL screening and comparator-based testing of HF components in R&D and production-related environments

Model Measurement frequency
IM7581 100 kHz to 300 MHz
IM7580A 1 MHz to 300 MHz

Product Description
Impedance measurements up to 300 MHz support analysis of HF components used in power electronics and noise suppression applications. With a frequency range from 100 kHz to 300 MHz, the IM7581 supports characterization of components such as power inductors, common-mode filters, ferrite components and filter structures.
Measurement Performance and Analysis Functions
With a basic accuracy of ±0.72% of impedance and ±0.41° of phase, the IM7581 is designed for precise impedance measurements up to 300 MHz. Test signal levels from −40.0 dBm to +7.0 dBm support measurement conditions that require higher excitation of the device under test. Typical repeatability of approximately ±0.07% supports reproducible measurement results under defined conditions across its entire frequency range. A typical measurement time of 0.5 ms enables fast frequency sweeps without compromising measurement stability.
The analyzer supports LCR, sweep and continuous measurement modes and provides evaluation functions such as comparator and BIN judgment, as well as area, peak and spot analysis. All measurement settings and analysis functions are accessed directly via the integrated 8.4 inch color touchscreen. Standard interfaces include USB, LAN and EXT I/O, with optional RS-232C and GP-IB.
For further analysis, the IM7581 provides an equivalent circuit analysis function with representative circuit models and automatic model selection based on measurement data. This supports impedance and resonance evaluation of components within its specified frequency range.
Test Head and Fixtures
The IM7581 employs a compact, palm-sized test head connected to the main unit by a specified connection cable. It is available with 1 m or 2 m cable lengths, allowing users to balance measurement accuracy and installation flexibility. Placing the test head close to the device under test minimizes signal path length and reduces parasitic inductance and capacitance that would otherwise affect high-frequency measurements. This design supports stable and reproducible results up to 300 MHz while reducing bench space requirements in high-frequency measurement environments.
For measurements of components with different package types, the IM7581 is typically used in combination with the IM9202 test fixture. The IM9202 is designed for impedance measurements up to 600 MHz and supports both surface-mount and leaded components with a stable two-terminal contact interface. Defined contact geometry ensures reproducible placement of the device under test and reliable electrical contact, reducing measurement variation and enabling accurate characterization of inductive and filtering components within the specified frequency range.
For stable mounting, the IM9202 test fixture is mounted on the IM9200 stand. The stand provides a secure base and a defined mechanical connection between the test head and the fixture and includes a magnifier to facilitate handling of small components. The IM9906 adapter is required to connect the 7 mm interface of the test fixture to the analyzer test head’s 3.5 mm connector.
Calibration and Measurement Integrity
With the optional IM9905 calibration kit, OPEN, SHORT and LOAD reference standards are available to correct system-related errors in high-frequency impedance measurements up to 3 GHz. The calibration addresses parasitic influences within the measurement path up to the specified reference plane, including the analyzer test head and its interfaces. The calibration standards are connected via the IM9906 adapter, which is shared with test fixture connections.
Integrated contact check functions, including DCR testing, Hi-Z reject and waveform verification, are used to assess contact quality before and, if necessary, after measurement. This reduces the risk of invalid results caused by poor electrical contact or unstable component positioning. Developed and manufactured in Japan, the IM7581 is intended for reliable long-term operation in measurement and test environments with high requirements for stability over time.