Impedance Box
Contents
1. 0e ee0eeeeeeeeeeee Less noise e More sound User Manual RT IB 100V Impedance Box 1 Wiring Connect the RT IB 100V impedance box to the other componenis of the test setup as shown in Figure 7 Anechoic box aN s E RT IB 100V impedance box Voltage Range 85 264 VAC t Frequency Range 47 63 Hz to Rapid Tes Measure OUT r Fy za Fe a o Power Fuse T2 5A 250V RAPID TEST we a pa Ae IEEE 498 INTERFACE Input Chn 1 7 0 APOTEST KTM Driver from Amplifier Signal IN use only type FSF eae 250V from NTI HIA F 175mA athe XLR Adapter 4 Figure 1 Test Setup NOTE Only use original fuses supplied by NTI Never touch any input or output connectors Observe the maximum current ratings of the different connector types and shunt resistors refer to next page NTI AG www nti audio com page 1 of 4 Line Input ATTENTION AN pole of RT IB 100V AN connected to earth 100V Amplifier peT EAE Wt d Output Chn 1 a V1 3 Sep 2007 MBe n ii ni User Manual RT IB 100V 2 Shunt Resistor Selection Determine the appropriate shunt resistor for the speaker to be tested according to one of the procedures described below A Voltage amp power across the speaker are known 1 On the graph of Figure 2a look for the line that represents the voltage U across the speaker 2 Follow this line to the2. 5A 250V to Rapid Test Measure OUT from Amplifier Mains power plug Earth connection Output connectors Figure 5 Front amp Rearpanel of RT IB 100V 6 Technical Specifications Load imped 4 Ohm 30 kOhm Fuses special F3A F1A F175mA Voltage ratio 1 4 92 available from NTI Shunt resistors 1 20 400 Ohm Temp range 5 45 C 40 110 F Shunt accuracy 0 1 R H lt 90 non condensing Worst case impedance measurement tolerance 26 19 rack 1 rack unit high 5 f 100 Hz 10 kHz 483 x 183 x 43 mm LxWxH 10 f 20 Hz 20 kHz Weight 1 7 kg 3 8 lbs 7 Contact Details NTI Headquarters e mail info nti audio com Im alten Riet 102 Web www nti audio com LI 9494 Schaan Phone 423 239 6060 Liechtenstein Europe Fax 423 239 6089 page 4 of 4
3. RT 2M and RT IB 100V system under RT Speaker whereby the following versions must be installed e RT 2M firmware V6 13 or higher e RT Speaker software V2 50 or higher In this case execute the following adjustments under RT Speaker e Voltage divider ratio 1 4 93 Configure RT Speaker Accessories e Impedance box shunt resistor 1 20 or 400 Ohm Edit project gt Test composition E3 Configure RT Speaker xj xj me y F z Test Composition Classifying ErequencySimpedance 5 4322 Sound Pressure Polarity Thiele Small Statistic Data logging Follow Up Hats xt Communication Administrator Accessories Interface Network Setiainumber Barcode l l l l l l l l Miscellaneous Mic 1 EJERNE Test composition Miscellaneous Accessories settings 7 use Impedance box AT IB Jmpedance box shunt reshio Allowed amplifier input voltage range ee 3 000 y req i I use pre conditioning signal Ferrofluid accumulation min input voltage ono WY min 1208 difference max input voltage uired RT2M settings 6 Vota V atthe DUT specify test signal level unit I Generator output floating Sound pressure dBSPL at Voltage divider at Inp Cho NTI USB Inp Switcher Peform test signal test level Microphoaw me F IV Fregency test M Use Divider with ratio T I Use Input Switcher with 3 Miciophenes fv Impedance lest SS Wah testsignet SS Stepped Sweep E Jo Y i as L I7 dBSPL T
4. est Calibrati el J Polarity test _Temperature amp Humidity sensor J7 Thiele Small tests Use Temperature deg C amp Humidity sensor of PE pest DEM N I Rub amp Buzz test with best oual Chu v 2 00 y EX v Figure 3a Voltage divider ratio adjustment Figure 3b Shunt resistor vlaue adjustment NOTE All shunt resistors within RT IB 100V are protected with an active circuit against overloading If an excessive or longer overload occurs the corresponding fuse will be blown Therefore take special care to select the appropriate shunt resistor for your setup prior to any measurement 4 Schematic Diagram Banana Banana Blue 2 to Speaker Blue from Amplifier ce i to Rapid Test Red 4 Signal OUT F3 a kg Red 4 Signal IN sit r Measure OUT F F2 use R2 Calibrate Shunt 20 Ohm A E Measure Differential S1 Amplifier Imax max Current Imax R1 1 Ohm 3A R2 20 Ohm 1A R3 400 Ohm 175mA Figure 4 Schematic diagram of RT IB 100V page 3 of 4 HE User Manual RT IB 100V 5 Front amp Rear Panel 400 Ohm Shunt Imax 175A 20 Ohm Shunt Imax 1A 1 Ohm Shunt max 3A Shunt resistor selector Measure Calibrate switch Power ON OFF Output connector Measure OUT Input connectors Fuses Voltage Range 85 264 VAC Frequency Range 47 63 Hz i Signal IN Fuse use only type FSF 6 3x32 250V from NTI Signal OUT to Speaker Power Fuse T2
5. point where it intersects the power across the speaker vertical Y axis if this point is located in the yellow section swap to Figure 2b 3 Look for the shunt resistor section in which this point is located blue 1 Ohm green 20 Ohm red 400 Ohm 4 Adjust the shunt resistor switch on the RT IB 100V front panel accordingly B Impedance of the speaker is known 1 Look for the impedance value of your speaker on the horizontal X axis 2 Adjust the shunt resistor switch on the RT IB 100V front panel according to the shunt resistor section which is located right above the speaker impedance value c c c c wy aN EN 4 gt w DA b b o Forbidden zones al Refer to enlarged graph 120 100 80 60 Power across Speaker W 40 20 gt 10k Speaker Imped 120 Ohm gt kOhm Ohm Figure 2a Shunt resistor selector guide c c c c U Voltage across the speaker 4 N Forbidden zone Example Given 100 V speaker with 4 W SE power consumption 14441 1 Goal Determine the appropriate shunt resistor of RT IB 100V Solution Look for the point in Figure 2b where the curve labeled N e i U 100 V intersects the 2KOhm peaker Imped horizontal 4 W line Ohm gt 400 Ohm shunt required Power across Speaker W Figure 2b Shunt resistor selector guide excerpt page 2 of 4 MERTE User Manual RT IB 100V 3 RT Speaker Adjustments NTI recommends to operate the
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