Eaton MTL7700 Instruction Manual

Contents

14INM 7700 R ev 128 4 Test tables for passive barriersTables 4 to 10 detail the tests for all MTL7700 range of ‘passive’ barriers. In the ‘diode test’ columns, the figures adjacent to the diodedescription indicate the number of forward-biased diodes used in the barrier chain. Using the multimeter diode test function and knowingthe diode voltage drop figures (approximately 0.6V for each Zener diode and 0.3V for each Schottky diode), the expected reading acrossthe diode chain can be determined.Table 4: Single channel polarised barriersTable 5: Dual channel polarised barriersNote: Vfz is the voltage dropped by a forward biased zener diode - 0.6V typicallyVr is the voltage dropped by the sense and current limit resistors - 3.2V for a typical 1mA test currentBARRIER DATA MULTIMETER TESTS CONSTANT-CURRENT TESTSModelNoSafetyDescriptionEnd-to-endResistanceΩDiodeTest+veDiodeTest-veTerminalVoltage@ 10μATerminalVoltage@ 20mAV Ω mA Min Max Min Max Min Max7758+ 7.5 10 750 14 17 ∞ Vfz x 1 6 6.9 6.6 77758- 7.5 10 750 14 17 ∞ Vfz x 1 6 6.9 6.6 77764+ 12 1k 12 1010 1050 ∞ Vfz x 1 10 11.4 10.5 11.67764- 12 1k 12 1010 1050 ∞ Vfz x 1 10 11.4 10.5 11.67767+ 15 100 150 110 119 ∞ Vfz x 1 12 13.6 12.4 13.77779+ 28 300 93 311 333 ∞ Vfz x 2 25.9 26.3 26 26.57796+ 26 300 87 311 333 ∞ Vfz x 2 23.9 24.4 24 24.67796+ (ch2) 20 390 51 401 428 ∞ Vfz x 2 18.3 18.8 18.4 197796- 26 300 87 311 333 Vfz x 2 ∞ 23.9 24.4 24 24.67796- (ch2) 20 390 51 401 428 Vfz x 2 ∞ 18.3 18.8 18.4 197788+ 28 300 93 311 333 ∞ Vfz x 2 25.9 26.4 26 26.67788+ (ch2) 10 50 200 62 75 ∞ Vfz x 1 6 9.5 6.6 9.77788R+ 28 300 93 311 333 ∞ Vfz x 2 25.9 26.4 26 26.67788R+(ch2)10 50 200 62 75 Vr Vr 0 0 6.2 6.8BARRIER DATA MULTIMETER TESTS CONSTANT-CURRENT TESTSModelNoSafetyDescriptionEnd-to-endResistanceΩDiodeTest+veDiodeTest-veTerminalVoltage@ 10μATerminalVoltage@ 20mAV Ω mA Min Max Min Max Min Max7710+ 10 50 200 62 75 ∞ Vfz x 1 6 9.5 6.6 9.77710- 10 50 200 62 75 ∞ Vfz x 1 6 9.5 6.6 9.77715+ 15 100 150 110 119 ∞ Vfz x 1 12 13.6 12.4 13.77715P+ 15 50 291 59 64 ∞ Vfz x 1 12.6 13.3 13 13.47722+ 22 150 147 159 174 ∞ Vfz x 2 19.6 20.9 19.7 21.17722- 22 150 147 159 174 ∞ Vfz x 2 19.6 20.9 19.7 21.17728+ 28 300 93 311 333 ∞ Vfz x 2 25.9 26.5 26 26.77728- 28 300 93 311 333 Vfz x 2 ∞ 25.9 26.5 26 26.77728P+ 28 237 119 241 252 ∞ Vfz x 3 24.9 25.5 25 25.67729P+ 28 164 170 171 184 ∞ Vfz x 3 24.9 25.5 25 25.6