STB6638 Series Precision Capacitance Meter

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STB6638 Series Precision Capacitance Meter

Overview Specifications Ordering Resources

STB6638 series is a new precision capacitance meter with higher test frequency. With small size and portable appearance, it is convenient for use on the shelves. With basic accuracy of ±0.07%, loss accuracy of 0.0005, test frequency up to 1MHz, 4.3-inch LCD screen, selectable Chinese-English operation interface, STB6638 series is easy to operate and provide fast and reliable test for ceramic capacitor production. Also, it can test all kinds of capacitors from low value to high value. The results of testing one capacitor for several times are quite stable and accurate, even for lower value capacitors. The tester is compatible with SCPI command set, and configured with manipulator and scanner interface, the scanner interface can scan the open/short/load error calibration in each channel, 256 channels at most. In low frequency, there is signal level compensation function. When the impedance is very small, the internal resistance in signal source and test cable will cause the voltage on terminal of DUT lower than the set range, then this function will adjust the level to the set range.

** Standard Lead Time: within 4 weeks **

Key Features

Max. test frequency: 1MHz

Highest test speed: 2.3ms/time

Basic test accuracy : ±0.07%

Loss factor: ±0.0005

Built-in 11-bin comparator

Compatible with SCPI commands

Offset function in 1MHz test frequency (±1, ±2%)

High Speed, High Precision, High Consistency
Test Speed: 2.3 ms (100 kHz/1 MHz), 3.0 ms (1 kHz/10 kHz/40 kHz), 11.0 ms (120/100 Hz)
Capacitance Measurement Accuracy: ±0.07%; Dissipation Factor: ±0.0005
Featuring 18 range configurations—a density three times greater than that of traditional LCR meters—the instrument ensures that high precision and consistency are maintained even during high-speed testing.
Precise Testing of DC-Link Film Capacitors for New Energy Vehicles
The three-parameter (Cs-Rs-Ls) testing function addresses the challenges associated with measuring the Equivalent Series Resistance (ESR) and Equivalent Series Inductance (ESL) of DC-Link film capacitors used in new energy vehicles. With the rapid advancement of industry, energy shortages have emerged as a global issue, establishing new energy vehicles as the primary direction for the future development of the automotive industry. Electric motors, batteries, and motor control technology constitute the three core pillars of new energy vehicles. At the heart of motor control technology lies inverter technology—specifically, high-efficiency inverter technology for motor control—which, in turn, necessitates a robust IGBT module paired with a matching DC-Link capacitor.
Contact Check and Synchronous Signal Source Functions
Contact Check: Requires no additional time, as the signal is output only during the actual test. This ensures the accuracy and validity of test data while preventing contact degradation caused by prolonged contact duration.

Frequency Offset Settings
The 1 MHz test frequency can be offset by: -2%, -1%, +1%, and +2%.
When integrating two or more capacitance meters into an automated robotic system (e.g., a capacitor array testing system) or onto a shared test bench, the frequency offset function allows each instrument to be configured with a distinct frequency. This effectively eliminates mutual interference between adjacent measurement terminals and reduces fluctuations in measurement results.

Scanner Interface and Bin Sorting
Bin Sorting: Configures 9 sorting bins based on product quality criteria, classifying products according to the test results for C, D, Q, R, and G parameters.
High-Speed, High-Precision Testing of Electrolytic Capacitors
High-Speed, High-Precision Testing of DC-Link Capacitors
High-Speed, High-Precision Testing of Ceramic Capacitors
High-Speed, High-Precision Testing of Film Capacitors
High-Speed Testing for Various Capacitor Production Lines
ntegrated Testing for High-Speed Automated Production Lines
Distributed Capacitance Testing for Semiconductors, Components, and Materials
Various Other Types of Capacitors…

Frequency Range	STB6638: 100Hz ,120Hz, 1kHz, 10kHz,100kHz, 1MHz,1MHz±1%,1MHz±2% STB6638A: 100Hz ,120Hz, 1kHz, 10kHz,40kHz,100kHz STB6638B: 100Hz ,120Hz, 1kHz, 10kHz STB6638C: 100Hz ,120Hz, 1kHz
Basic Accuracy	±0.07%
Signal Source Delay	Range: 0-1s Resolution: 0.1ms
Signal Level Compensation	100/120Hz: 220μF, 470μF, 1mF range 1kHz: 22μF, 47μF, 100μF range
Level	Range: 0.1V-1V Resolution: 0.01V Accuracy: ±5%

Main Machine

Module No.	Item	Description
STB6638	Precision Capacitance Meter	Frequency range: 100Hz ,120Hz, 1kHz, 10kHz,100kHz, 1MHz,1MHz±1%,1MHz±2%, including Four-terminal Test Fixture, short circuit and Four-terminal Pair Kelvin Test Clip Leads.
STB6638A	Precision Capacitance Meter	Frequency range:100Hz ,120Hz, 1kHz, 10kHz,40kHz,100kHz, including Four-terminal Test Fixture, short circuit and Four-terminal Pair Kelvin Test Clip Leads.
STB6638B	Precision Capacitance Meter	Frequency range:100Hz ,120Hz, 1kHz, 10kHz, including Four-terminal Test Fixture, short circuit and Four-terminal Pair Kelvin Test Clip Leads.
STB6638C	Precision Capacitance Meter	Frequency range:100Hz ,120Hz, 1kHz, including Four-terminal Test Fixture, short circuit and Four-terminal Pair Kelvin Test Clip Leads.

Options

Module No.	Item	Description
SBF0008A	SMD Component Test Fixture	DC-120MHz, maximum ±42V DC bias, applied to SMD components, especially high-frequency small capacitor ≤3pF or small inductance ≤1uH, test frequency ≥100kHz

Document

STB6638 Series Precision Capacitance Meter Datasheet