1. Manuals
  2. Brands
  3. Murata Manuals
  4. Measuring Instruments
  5. 4284A
  6. Manual

Murata 4284A Manual

Lcr meters
Hide thumbs
Table of Contents

Advertisement

Quick Links

Capacitance and Dissipation Factor
Chip Multilayer Ceramic Capacitors
1. Introduction ---------------------------------------------------------------- 1
2-1. Temperature Characteristic
2-2. Voltage Characteristic
(1) AC Voltage Characteristic
(2) DC Bias Characteristic
2-3. Frequency Characteristic
2-4. Summary
3. LCR Meters and Measurement Jigs -------------------------------- 6
4. LCR Meter Measurement Principle --------------------------------- 7
7. Closing ---------------------------------------------------------------------- 18
References -------------------------------------------------------------------- 18
TD No.C10E
Measurement of
Murata Mfg. Co., Ltd.
Page

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the 4284A and is the answer not in the manual?

Questions and answers

Subscribe to Our Youtube Channel

Related Manuals for Murata 4284A

Summary of Contents for Murata 4284A

  • Page 1: Table Of Contents

    4. LCR Meter Measurement Principle --------------------------------- 7 4-1. Measurement Principle 4-2. Measuring Voltage 4-3. Capacitance Measurement Circuit Mode 5. Capacitance Measurement by LCR Meter 4284A -------------- 10 6. Capacitance Measurement by LCR Meter 4278A -------------- 14 7. Closing ---------------------------------------------------------------------- 18 References -------------------------------------------------------------------- 18 Murata Mfg.

  • Page 2: Introduction

    1. Introduction When you measure a high dielectric MLCC capacitor (X7R-characteristic or Y5V-characteristic) using a LCR meter, there may be a case you can not obtain a reasonable capacitance value within its nominal range. As capacitance and dissipation factor of these Temperature characteristic MLCC capacitors significantly change according to the measurement temperature, voltage (AC, DC) and frequency.
  • Page 3 2-1. Temperature Characteristic Temperature characteristics of MLCC capacitors are shown in Fig.1 below: At the measurement conditions of 1kHz, 1Vrms, whereas capacitance change ratio of the X7R-characteristic is within ± 15% at maximum, The Y5V-characteristic capacitor is allowed to over a wider range of +22% /-82%. Dissipation factor also changes according to measurement temperature, which tends to go up in lower temperatures for both X7R- and Y5V- characteristic capacitors.
  • Page 4 2-2. Voltage Characteristic (1) AC Voltage Characteristic The AC voltage characteristics of X7R- and Y5V-characteristic MLCC capacitors are shown in Fig.2 below: At the measurement conditions of 25 degree, 1kHz, while capacitance change ratio of the X7R-characteristic capacitors is within ± 5% at maximum, the capacitance of Y5V-characteristic capacitors drops by 50% at the maximum and changes according to applied AC voltage level.
  • Page 5 (2) DC Bias Characteristic The DC bias characteristics of X7R- and Y5V-characteristic MLCC capacitors are shown in Fig.3 below: At the measurement conditions of 25 degree, 1kHz, 1vrms, the capacitance of the X7R-characteristic capacitor drops by a maximum of 60% according to DC bias voltage applied, while the capacitance of the Y5V-characteristic capacitor drops as much as 90%.
  • Page 6 2-3. Frequency Characteristic The frequency characteristics of X7R- and Y5V-characteristic MLCC capacitors are shown in Fig.3 below: Although capacitance of both X7R- and Y5V-characteristic capacitors changes little as the measurement frequency is altered, their dissipation factors change substantially according to the measurement frequency.

  • Page 7: Lcr Meters And Measurement Jigs

    LCR meters are generally used for measurement of the capacitance and dissipation factor of capacitors. Typical LCR meters include 4284A, 4278A and 4268A by Agilent Technologies Corp. as shown in Fig.5. As there are some measurement instruments that do not meet the measurement conditions specified in Table 1, please review the measurement principles in Section 4 and measurement methods in Section 5 and 6 before performing any tests.

  • Page 8: Measurement Jigs

    3-2. Measuring Jigs It is necessary to select a measurement jig appropriate the LCR meter to be used. Typical measurement jigs used for MLCC capacitors are shown in Fig.6 below: (a) 16034E (b) 16334A Fig.6 Appearance Photographs of Measuring Jigs There are two types of measurement jigs, a type on which a chip capacitor is placed and measured by applying a pin to one-side of the electrode terminal, such as 16034E of Agilent Technologies Corp.

  • Page 9: Measuring Voltage

    4-2. Measuring Voltage LCR meters generally provide internal resistances to protect their own power supply circuits. Depending on the value of this resistance, the actual voltage differential between the electrodes of a capacitor being measured drops excessively which prevents correct measurement of capacitance and dissipation factor of the capacitor.
  • Page 10 A large capacitance has a small reactance, i.e. low impedance, which makes the influence of serial resistance Rs on the measurement far larger than that of parallel capacitance Rp, thus Rp can be neglected and measurement circuit provides a serial equivalent circuit mode. High impedance) Low impedance) Fig.9 Small capacitance...

  • Page 11: Capacitance Measurement By Lcr Meter 4284A

    5. Capacitance Measurement by LCR Meter 4284A The correct capacitance measurement method using a typical LCR meter 4284A and measurement jig 16034E is described in this section. 5-1. Turn on the power of LCR meter This measurement equipment requires warm-up time. Turn the power on for the meter 30 minutes before starting actual measurement.
  • Page 12 A field in the above figure is set to measurement frequency and voltage required. This field is correctly set to FREQ: 120Hz and LEVEL: 500mV according to the specification. B is a field that displays the values of measured capacitance and dissipation factor. The capacitance is about 94 F is compared against the nominal value of 100 F of the sample capacitor, this is within the specified capacitance tolerance.
  • Page 13 A field in the above figure indicates both ALC and Hi-PW being set to ON . An asterisk mark at B field in the figure means ALC being on. Fig.16 Measure Setup Screen Showing ALC ON Vm in A field in the above figure indicates actual measurement voltage monitored by the meter, which shows 1V being applied to the sample.
  • Page 14 Vm in A field indicates actual measurement voltage monitored by the meter, which shows 1V is applied to the sample. B field shows a capacitance of a 10 F product, which is about 9.86 F which is within the specified tolerance. Fig.19 Measure Setup Screen Showing ALC OFF Note 2: Check Method of Measurement Voltage Applied to Capacitor Under Test One method to check the measurement voltage actually applied to a capacitor under test is...

  • Page 15: Capacitance Measurement By Lcr Meter 4278A

    5-4. Calibration You implement the measurement calibration using CORRECTION in the MEAS SETUP screen. The are two types of calibration Short Calibration and Open Calibration , The order in which you preform the calibration is optional. (1) Short Calibration For short condition, see Fig.22. Confirm that Rs is 0. or less at this point.
  • Page 16 10 F because such capacitance requires a measurement frequency of 120Hz. Use 4284A or 4268A for the measurement of a capacitor greater than 10 F. Fig.25 Menu Screen - 15 -...
  • Page 17 Note 5: Check Method of Measurement Voltage Actually Applied to a Capacitor Even though you set the measurement voltage to 1Vrms, if 1Vrms is not actually applied to the capacitor to be measured, you won t be able to correctly measure capacitance.
  • Page 18 Note 6: Capacitance Change by Aging Characteristic Although the aging characteristic of high dielectric MLCC capacitors is not directly related to the capacitance measurement, as it reduces capacitance of the MLCC capacitors, you must take it into consideration when designing a circuit using those capacitors.

  • Page 19: Closing

    This brochure explains key points in the measurement that are likely to be mistaken or overlooked. We hope that this brochure is useful for your capacitor measurement. References 4284A Operation Manual, Agilent Technologies Corp. 4278A,Operation Manual, Agilent Technologies Corp. Impedance Measurement Handbook, Agilent Technologies Corp. Second Edition, 2001...

This manual is also suitable for:

4278a4268a

Table of Contents