NF ZM2371/2372/2376 ALC (Automatic Level Control) 100KHZ LCR Meter Japan Circuit Design

The ZM2371 and ZM2372 cover a measurement frequency range from 1 mHz to 100 kHz and offer 5-digit resolution. The ZM2376 covers a measurement frequency range from 1 mHz to 5.5 MHz and offers 6-digit resolution. This product is not only suitable for measuring general electronic products, but can also be used to evaluate the impedance characteristics of batteries and other materials.

The test results of this product are the results of testing the same test object 200 times under the same test conditions. The deviation of the ZM2372 test results is approximately below 0.01%, while the ZM2376 is even better. Highly repeatable measurement results are extremely important for an impedance analyzer.

When using general-purpose measuring instruments, an electrolytic capacitor that has stored charge will discharge once connected, and the input circuit is very likely to be damaged. The ZM series' discharge protection function protects the input circuit from being damaged by this energy (up to 4 J). Therefore, if a component that has stored charge is accidentally connected during measurement, accidents can be prevented.

The measurement signal level from 10 mVrms to 5 Vrms / 1 μArms to 200 mArms can be set with 3-digit resolution. In addition, the ALC (automatic level control) function enables constant-voltage/constant-current driving, so the device can be driven with a stable drive signal that takes into account the voltage/current dependence of the sample, enabling highly reproducible measurements.

The measurement time can be switched among 5 levels: RAP (Rapid), FAST, MED (Medium), SLOW, and VSLO (Very Slow). Selecting RAP enables fast measurement of 2 ms (1 kHz/1 MHz) and 10 ms (120 Hz). A fast, high-precision LCR meter helps improve the measurement efficiency of production lines and automatic inspection equipment.

Achieves high-precision measurement with basic accuracy of 0.08% and display resolution of up to 6 digits. Reliable measurement is indispensable for improving product performance and quality, from the development of cutting-edge devices to component sorting on inspection lines.

Can measure the DC resistance of the winding resistance of coils and transformers. The inductance can be displayed as the primary parameter and the DC resistance measurement value as the secondary parameter at the same time.

● ZM2372

4-terminal contact check

(Additional time for contact check: 4 ms)

● ZM2376

Contact check, low capacitance check

A function that can drive the sample only during contact.
It can reduce contact damage caused by attaching and detaching the sample when measuring large-capacity capacitors. For samples whose measurement history characteristics are measured in a short time, the measured values will show large errors. If trigger circuit synchronized drive is used, the drive signal applied to each sample and the timing and phase relationship of the acquired signal are fixed, which can suppress errors in measured values and greatly shorten the measurement time.

By presetting the display value of the measured component, the deviation and deviation % from the preset value can be displayed. It can be applied to pass/fail judgment of specification values for component tolerances and temperature characteristic tests, etc.

The primary parameter can be divided into up to 14* BIN categories, and the secondary parameter can sort the measurement results against one set of configured upper/lower limits. Measured values can be sorted by deviation or deviation %, and the judgment result is output via the handler interface*. In addition, depending on the judgment result, a beep sound may be emitted.
In remote control, using the limit judgment function, the upper and lower limits (one set each) of the primary and secondary parameters can also be judged.
*ZM2371: Up to 9 categories, no handler interface equipped.

Composite measurement is a function that can specify measurement conditions for up to 32 steps for one sample and perform comprehensive pass/fail judgment. The measurement frequency, measurement signal level, internal DC bias, measurement parameters, etc. can be set for each step, and measurement and limit judgment are performed for one set of upper/lower limits of the primary parameter and one set of upper/lower limits of the secondary parameter.
*A function unique to the ZM2376.

Various interfaces for remote control are standard equipment. Production line integration and automatic inspection systems, etc. can be supported without adding optional items.

The ZM series features a compensation function that suppresses the effects of cabling. In the following measurement examples, the measurement results differ little whether 1m, 2m, or 4m cables are used. In measurements using a temperature test chamber, the cables between the measuring instrument and the device under test are very long and thin, yet accurate measurement results can still be obtained.

The internal DC bias voltage of the ZM2376 can be set to a maximum of +5V, so it can measure lithium-ion batteries (single cells) with an electromotive force exceeding 3V.