Itm 885 Operating Manual

Text of Itm 885 User Guide:

• 12 L Accuracy: LxfZx ⋅⋅⋅= π 2 L Ae = Ae of |Zx| f : Test Frequency (Hz) Lx : Measured Inductance Value (H) |Zx| : Measured Impedance Value ( Ω ) Accuracy applies when Dx (measured D value) ≦ 0.1 When Dx > 0.1, multiply L Ae by 2 1 Dx+ Example: Test Condition: Frequency : 1KHz Level : 1Vrms Speed : Slow DU

• Itm 885, 4 ( ) ( ) ( ) ( ) ( ) Ohm Reactance Resistance Impedance 1 22 =Ω = = =         == +== Ω∠=+= − S S s s s sss ss X R Z R X TanSinZX XRZCosZR ZjXRZ θθ θ θ There are two different types of reactance: Inductive (X L ) and Capacitive (X C ). It can be defined as follows: Also, there are quality factor (Q) and the dissipation factor (D) that need to be discussed. For component, the quality factor serves as a measure of the reactance purity. In the real world, there is always s X s R ( ) sX,RZ s Z θ Imaginary Axis Real Axis Figure 1.1 fCC X fLLX C L πω πω 2 11 2 == == L = Inductance (H)

• Itm 885, 15 Accuracy applies when 1<⋅ DeQx Example: Test Condition: Frequency : 1KHz Level : 1Vrms Speed : Slow DUT : 1mH Then Ω=⋅⋅⋅= ⋅⋅⋅= − 283.610102 2 33 π π LxfZx Refer to the accuracy table, get L Ae =±0.5%, 005.0 100 ±=⋅±= Ae De If measured Qx = 20 Then 1.01 2 1 2   ±= ⋅ ⋅ ±= DeQx DeQx Q Ae θ Accuracy: 100 Ae π 180 e ⋅=θ w ww. . com [email protected]

• Itm 885, 36 H CUR H POT L CUR L POT Zdut C o Rs L s G o Z m Redundant Impedance (Z s ) Parastic Conductance (Y o ) Parastic of the Test Fixture (a) Parastic Effect of the Test Fixture H CUR H POT L CUR L POT C o R s L s G o (b) OPEN Measurement Y o OPEN Y o = G o + j£sC o 1 (R s + j£s<< ) G o +j£sC o H CUR H POT L CUR L POT Co Rs L s G o (c) SHORT Measurement Zs SHORT Z s = R s + j£sL s Figure 3.7 w ww. . com [email protected]

• Itm 885, 41 Service Information Warranty Service: Please return the product in the original packaging with proof of purchase to the below address. Clearly state in writing the performance problem and return any leads, connectors and accessories that you are using with the device. Non-Warranty Service: Return the product in the original packaging to the below address. Clearly state in writing the performance problem and return any leads, connectors and accessories that you are using with the device. Customers not on open account must include payment in th

• Itm 885, 39 Figure 3.9 Small inductor (Low impedance) R P L R S Large inductor (High impedance) Effect No Effect R P L R S No Effect Effect w ww. . com [email protected]

• Itm 885, 33 (d) WRONG 4T CONNECTION H POT DUT (b) BLOCK DIAGRAM (a) CONNECTION (c) TYPICAL IMPEDANCE MEASUREMENT RANGE (£[) 5T 1m 10m 100m 1 10 1K 10K 100K 1M100 10M H CUR DUT V A DUT V A LPOT L CUR Figure 3.4  4-Terminal 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). The return current will flow through the coaxial cable as well as the shield. Therefore, the magnetic flux that generated by internal conductor will cancel out the magnetic flux generated by external

• Itm 885, 43 SAFETY SYMBOLS Caution, risk of electric shock Earth ground symbol Equipment protected throughout by double insulation or reinforced insulation ! Caution (refer to accompanying documents) DO NOT SUBSTITUTE PARTS OR MODIFY INSTRUMENT Because of the danger of introducing additional hazards, do not install substitute parts or perform any unauthorized modification to the instrument. Return the instrument to a qualified dealer for service and repair to ensure that safety features are maintained. INSTRUMENTS WHICH APPEAR DAMAGED OR DEFECTIVE SHOULD NOT BE USED! PLEASE CONTACT B&a

• 1 1. Introduction 1.1 General The B&K Precision Models 885 & 886 Synthesized In-Circuit LCR/ESR Meter is a high accuracy hand held portable test instrument used for measuring inductors, capacitors and resistors with a basic accuracy of 0.2%. It is the most advanced handheld AC/DC impedance measurement instrument to date. The 885 or 886 can help engineers and stude

• Itm 885, 30 4. Application 4.1 Test Leads Connection Auto balancing bridge has four terminals (H CUR , H POT , L CUR and L POT ) to connect to the device under test (DUT). It is important to understand what connection method will affect the measurement accuracy.  2-Terminal (2T) 2-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 measurement, the effective impeda

• Itm 885, 8 C Accuracy : 100Hz 79.57 pF | 159.1 pF 159.1 pF | 1.591 nF 1.591 nF | 15.91 nF 15.91 nF | 159.1 uF 159.1 uF | 1591 uF 1591 uF | 15.91 mF 2% ± 1  1% ± 1 0.5% ± 1 0.2% ± 1 0.5% ± 1 1% ± 1  120Hz 66.31 pF | 132.6 pF 132.6 pF | 1.326 nF 1.326 nF | 13.26 nF 13.26 nF | 132.6 uF 132.6 uF | 1326 uF 1326 uF | 13.26 mF 2% ± 1  1% ± 1 0.5% ± 1 0.2% ± 1 0.5% ± 1 1% ± 1  1KHz 7.957 pF |

• Itm 885, 18 Charged Capacitors Always discharge any capacitor prior to making a measurement since a charged capacitor may seriously damage the meter. Effect Of High D on Accuracy A low D (Dissipation Factor) 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 capacitance measurement accuracy may be degraded. It is best to check with the component manufacturers’ data sheet to determine th

• Itm 885, 38  Inductor The impedance and inductive in the inductor 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 important than the Rp. If the inductor is large, the Rp should be taking care of. So, uses series mode to measure low inductor and parallel mode to measure high inductor. Small capacitor (High impedance) R P C R S Effect No Effect La

• Itm 885, 28 2.3 Accessory Operation Follow the figures below to attach the test probes for making measurement.  Shorting Bar  TL885A SMD Test Probe w ww. . com [email protected]

• Itm 885, 31 3-Terminal uses coaxial cable to reduce the effect of the parasitic capacitor (Figure 3.2). The shield of the coaxial cable should connect to guard of the instrument to increase the measurement range up to 10M Ω . DUT V A (d) 2T CONNECTION WITH SHILDING H CUR HPOT DUT (b) BLOCK DIAGRAM DUT V A Co Ro Lo Ro L o Co doesn't effect measurement result (a) CONNECTION (c) TYPICAL IMPEDANCE MEASUREMENT RANGE(£[) 3T 1m 10m 100m 1 10 1K 10K 100K 1M100 10M LPOT L CUR Figure 3.2  4-Terminal (4T) 4-Terminal co

• Itm 885, 32 resistance (Figure 3.3). This connection can improve the measurement range down to 10m Ω . However, the effect of the test lead inductance can’t be eliminated. H CUR H POT DUT (b) BLOCK DIAGRAM DUT V A (a) CONNECTION (c) TYPICAL IMPEDANCE MEASUREMENT RANGE (£[) 4T 1m 10m 100m 1 10 1K 10K 100K 1M100 10M L POT L CUR Figure 3.3  5-Terminal (5T) 5-Terminal connection is the combination of 3T and 4T (Figure 3.4). It has four coaxial cables. Due to the advantage of the 3T and 4T, this connection can widely increase the measurement range for 10m Ω to 10M Ω . w ww.

• Itm 885, 27 shows some examples of capacitance measurement: The testing level and frequency can by selected by pressing the Level key and Frequency key, respectively. 2.2.10 Inductance Measurement Select 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 parallel mode (Lp) is selected, only the D and Q can be shown on the secondary display. The following shows some examples of capacitance measurement: The testing level and frequency can by selected by pressing the Level key

• 21 2. Operation 2.1 Physical Description G UARD POT H POT L CUR UARD CUR G LH  1. NA 2. Primary Parameter Display 3. Secondary Parameter Display 4. Low Battery Indicator 5. Model 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/

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