B+K precision 885 Скачать руководство пользователя страница 26 | Manualshive

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B+K precision 885 Скачать руководство пользователя страница 26

2.2.3

Open and Short Calibration

The Models 885 & 886 provides open/short calibration

capability so the user can get better accuracy in measuring high and

low impedance. We recommend that the user performs open/short

calibration if the test level or frequency has been changed.

z

Open Calibration

First, remaining the measurement terminals with the open status,

then press the CAL key shortly (no more than two second), the

LCD will display:

This calibration takes about 10 seconds. After it is finished, the

Model 885 will beep to show that the calibration is done.

z

Short Calibration

To perform the short calibration, insert the Shorting Bar into the

measurement terminals. Press the CAL key for more than two

second, the LCD will display:

This calibration takes about 10 seconds. After it is finished, the

Model 885 will beep to show that the calibration is done.

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Содержание 885

Страница 1: ...Instruction Manual Manual de Instrucci n LCR METER Models 885 886 MEDIDOR LCR Modelos 885 886...

Страница 2: ...Short Calibration 24 2 2 4 Display Speed 25 2 2 5 Relative Mode 25 2 2 6 Range Hold 25 2 2 7 DC Resistance Measurement 26 2 2 8 AC Impedance Measurement 26 2 2 9 Capacitance Measurement 26 2 2 10 Ind...

Страница 3: ...to or manual ranging Test frequencies of 100Hz 120Hz 1KHz 10KHz or 100KHz 886 may be selected on all applicable ranges The test voltages of 50mVrms 0 25Vrms 1Vrms or 1VDC DCR only may also be selected...

Страница 4: ...ed and unknown inductors capacitors or resistors and to measure capacitance inductance or resistance of cables switches circuit board foils etc The key features are as following z Test condition 1 Fre...

Страница 5: ...e measurement instrument there are DC impedance and AC impedance The common digital multi meter can only measure the DC impedance but the Model 885 can do both It is a very important issue to understa...

Страница 6: ...are two different types of reactance Inductive XL and Capacitive XC It can be defined as follows L Inductance H C Capacitance F f Frequency Hz fC C X fL L X C L 2 1 1 2 Also there are quality factor Q...

Страница 7: ...of the stored energy reactance and the dissipated energy resistance Q is generally used for inductors and D for capacitors p p p p p p s s s s s s R C L R X R G B R C R L R X D Q 1 tan 1 1 There are...

Страница 8: ...y components are Parallel G 1 Rp jB 1 jXp jB G Y jXp P jX 1 P R 1 Y Rp Figure 1 2 1 3 Specification z LCD Display Range Parameter Range Z 0 000 to 9999M L 0 000 H to 9999H C 0 000pF to 9999F DCR 0 000...

Страница 9: ...n 100KHz 886 NA 5 1 n 2 1 0 4 1 2 1 5 1 n Note 1 The accuracy applies when the test level is set to 1Vrms 2 Ae multiplies 1 25 when the test level is set to 250mVrms 3 Ae multiplies 1 50 when the tes...

Страница 10: ...Hz 2 1 X 1 1 0 5 1 0 2 1 0 5 1 1 1 X 7 957 pF 15 91 pF 15 91 pF 159 1 pF 159 1 pF 1 591 nF 1 591 nF 15 91 uF 15 91 uF 159 1 uF 159 1 uF 1 591 mF 1KHz 2 1 X 1 1 0 5 1 0 2 1 0 5 1 1 1 X 0 795 pF 1 591 p...

Страница 11: ...1 X 1 1 0 5 1 0 2 1 0 5 1 1 1 X 31 83 KH 1 591 KH 1 591 KH 159 1 H 159 1 H 15 91 H 15 91 H 1 591 mH 1 591 mH 159 1 uH 159 1 uH 15 91 uH 1KHz 2 1 X 1 1 0 5 1 0 2 1 0 5 1 1 1 X 318 3 H 159 1 H 159 1 H...

Страница 12: ...0 010 10KHz 0 050 n 0 020 0 005 0 002 0 005 0 010 n 100KHz 886 NA 0 050 n 0 020 0 004 0 020 0 050 n Accuracy Zx Freq 20M 10M 10M 1M 1M 100K 100K 10 10 1 1 0 1 100Hz 120Hz 1KHz 1 046 n 0 523 10KHz 2 61...

Страница 13: ...easured Capacitance Value F Zx Measured Impedance Value Accuracy applies when Dx measured D value 0 1 When Dx 0 1 multiply CAe by 2 1 Dx Example Test Condition Frequency 1KHz Level 1Vrms Speed Slow DU...

Страница 14: ...Value H Zx Measured Impedance Value Accuracy applies when Dx measured D value 0 1 When Dx 0 1 multiply LAe by 2 1 Dx Example Test Condition Frequency 1KHz Level 1Vrms Speed Slow DUT 1mH Then 283 6 10...

Страница 15: ...Value Lx Measured Inductance Value H Cx Measured Capacitance Value F Accuracy applies when Dx measured D value 0 1 Example Test Condition Frequency 1KHz Level 1Vrms Speed Slow DUT 100nF Then 1590 10...

Страница 16: ...measured D value 0 1 When Dx 0 1 multiply Dx by 1 Dx Example Test Condition Frequency 1KHz Level 1Vrms Speed Slow DUT 100nF Then 1590 10 100 10 2 1 2 1 9 3 Cx f Zx Refer to the accuracy table get CAe...

Страница 17: ...D Accuracy Accuracy applies when 1 De Qx Example Test Condition Frequency 1KHz Level 1Vrms Speed Slow DUT 1mH Then 283 6 10 10 2 2 3 3 Lx f Zx Refer to the accuracy table get LAe 0 5 005 0 100 Ae De...

Страница 18: ...requency 1KHz Level 1Vrms Speed Slow DUT 100nF Then 1590 10 100 10 2 1 2 1 9 3 Cx f Zx Refer to the accuracy table get ZAe 0 2 deg 115 0 100 2 0 180 100 Ae 180 Ae z Testing Signal Level Accuracy 5 Fre...

Страница 19: ...H 6 9 x 3 4 x 1 9 Weight 470g NOTE Specifications and information are subject to change without notice Please visit www bkprecision com for the most current product information Considerations Test Fre...

Страница 20: ...reading is desirable Electrolytic capacitors inherently have a higher dissipation factor due to their normally high internal leakage characteristics If the D Dissipation Factor is excessive the capaci...

Страница 21: ...culations Sometimes the capacitance of switches interconnect cables circuit board foils or other parts affecting stray capacitance can be critical to circuit design or must be repeatable from one unit...

Страница 22: ...ng Manual 1 pc z 2 AA Size Ni Mh Rechargeable Batteries 2 pc z Shorting Bar 1 pc z AC to DC Adapter 1 pc z TL885A SMD Test Probe 1 pc z TL885B 4 Wire Test Clip Optional z TL08C Kelvin Clip Optional z...

Страница 23: ...el Number 6 Power Switch 7 Relative Key 8 Measurement Level Key 9 Open Short Calibration Key 10 Measurement Frequency Key 11 Display Update Speed Key 12 D Q ESR Function Key 13 Range Hold Key 14 L C Z...

Страница 24: ...to change the batteries 1 Remove the battery hatch by unscrewing the screw of the battery compartment 2 Take out the old batteries and insert the new batteries into the battery compartment Please watc...

Страница 25: ...rtment called Battery Select Switch If the Ni Mh or Ni Cd rechargeable batteries are installed in Models 885 or 886 set the Battery Select Switch to Ni Mh position The Ni Mh or Ni Cd batteries can be...

Страница 26: ...terminals with the open status then press the CAL key shortly no more than two second the LCD will display This calibration takes about 10 seconds After it is finished the Model 885 will beep to show...

Страница 27: ...value reading Approximately 5 seconds in Fast Mode to get a stable reading Then press the Relative key the primary display will reset to zero Remove the standard value component and insert the unknown...

Страница 28: ...CR key to make the Z measurement The LCD display The testing level and frequency can by selected by pressing the Level key and Frequency key respectively 2 2 9 Capacitance Measurement To measure the c...

Страница 29: ...lect the L C Z DCR key to Ls or Lp mode for measuring the inductance in serial mode or parallel mode If the serial mode Ls is selected the D Q and ESR can be shown on the secondary display If the para...

Страница 30: ...2 3 Accessory Operation Follow the figures below to attach the test probes for making measurement Shorting Bar TL885A SMD Test Probe 28...

Страница 31: ...3 3 TL885B 4 Wire Test Clip TL08C Kelvin Clip 29...

Страница 32: ...ssion Mode Half Duplex Baud Rate 9600 Parity Bit None Data Bits 8 Stop Bit 1 Handshake None In this mode the keyboard and LCD will be locked And these Models measurement is controlled by the external...

Страница 33: ...0 05V 5 0e1mV 4 The question mark at the end of COMMAND means a query or measure back command For example CpD sets the measurement mode to Cp and D CpD sets the measurement mode to Cp and D as well as...

Страница 34: ...d is entered there is no response from the meter z DCR DC resistance measurement mode setting or querying command z CpRp Parallel capacitance and parallel resistance measurement mode setting or queryi...

Страница 35: ...ductance and dissipation factor measurement mode setting or querying command z RsXs Serial resistance and serial reactance measurement mode setting or querying command z RpXp Parallel resistance and p...

Страница 36: ...ETER ON ASCII string OFF Numerical code Example ASC ON FREQ 1KHz return value ASC OFF FREQ 2 return value CORR OPEN Perform the open calibration This command sets the Models 885 886 to do the open cal...

Страница 37: ...TER ASCII string Numerical code 100Hz 0 120Hz 1 1KHz 2 10KHz 3 100KHz 4 Example FREQ 100KHz z FREQ Return the current measurement frequency setting Example ASC ON FREQ 1KHz return value ASC OFF FREQ 2...

Страница 38: ...urn value ASC OFF LEV 1 return value MODE Query the measurement mode Six fields will be returned 1 Frequency 2 Level 3 Speed 4 Measurement mode 5 Unit of primary display 6 Unit of secondary display Th...

Страница 39: ...F Ohm return value RANG PARAMETER Set queries the measurement unit z RANG PARAMETER Set the measurement unit according to the parameter There is no return value PARAMETER ASCII string Numerical code p...

Страница 40: ...nt value This command will perform a measurement according to the current measurement mode and return the measured value Example CPD READ 0 22724 0 12840 return value DCR READ 5 1029 return value The...

Страница 41: ...s the measurement speed according to the parameter There is no return value PARAMETER ASCII string Numerical code SLOW 0 FAST 1 Example SPEED FAST z SPEED Return the current measurement speed setting...

Страница 42: ...Terminal is the easiest way to connect the DUT but it contents many errors which are the inductor and resistor as well as the parasitic capacitor of the test leads Figure 3 1 Due to these errors in me...

Страница 43: ...le should connect to guard of the instrument to increase the measurement range up to 10M DUT V A d 2T CONNECTION WITH SHILDING HCUR HPOT DUT b BLOCK DIAGRAM DUT V A Co Ro Lo Ro Lo Co doesn t effect me...

Страница 44: ...tance can t be eliminated HCUR HPOT DUT b BLOCK DIAGRAM DUT V A a CONNECTION c TYPICAL MPEDANCE MEASUREMENT RANGE 4T 1m 10m 100m 1 10 1K 10K 100K 1M 100 10M LPOT LCUR Figure 3 3 z 5 Terminal 5T 5 Term...

Страница 45: ...rminal Path 4TP 4 Terminal Path connection solves the problem that caused by the test lead inductance 4TP uses four coaxial cables to isolate the current path and the voltage sense cable Figure 3 5 Th...

Страница 46: ...H LDING Figure 3 5 z Eliminating the Effect of the Parasitic Capacitor When measuring the high impedance component i e low capacitor the parasitic capacitor becomes an important issue Figure 3 6 In fi...

Страница 47: ...hort compensation need to be used to reduce the parasitic effect of the test fixture The parasitic effect of the test fixture can be treated like the simple passive components in figure 3 7 a When the...

Страница 48: ...rastic Conductance Yo Parastic of the Test Fixture a Parastic Effect of the Test Fixture HCUR HPOT LCUR LPOT Co Rs Ls Go b OPEN Measurement Yo OPEN Yo Go j sCo 1 Rs j s Go j sCo HCUR HPOT LCUR LPOT Co...

Страница 49: ...lue to decide what mode to be used z Capacitor The impedance and capacitance in the capacitor are negatively proportional Therefore the large capacitor means the low impedance the small capacitor mean...

Страница 50: ...nductor are positively proportional Therefore the large inductor equals to the high impedance and vice versa Figure 3 9 shows the equivalent circuit of inductor If the inductor is small the Rs is more...

Страница 51: ...Small inductor Low impedance RP L RS L Effect No Effect RP RS No Effect Effect Large inductor High impedance Figure 3 9 49...

Страница 52: ...B K Precision Corporation 22820 Savi Ranch Parkway Yorba Linda California 92887 www bkprecision com 2005 B K Precision Corporation Made in Taiwan 481 304 9 001...

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