Eaton MTL7700 - Test Tables for Passive Barriers

14
INM 7700 Rev 12
8.4 Test tables for passive barriers
Tables 4 to 10 detail the tests for all MTL7700 range of ‘passive’ barriers. In the ‘diode test’ columns, the figures adjacent to the diode
description indicate the number of forward-biased diodes used in the barrier chain. Using the multimeter diode test function and knowing
the diode voltage drop figures (approximately 0.6V for each Zener diode and 0.3V for each Schottky diode), the expected reading across
the diode chain can be determined.
Table 4: Single channel polarised barriers
Table 5: Dual channel polarised barriers
Note: Vf
z
is the voltage dropped by a forward biased zener diode - 0.6V typically
V
r
is the voltage dropped by the sense and current limit resistors - 3.2V for a typical 1mA test current
BARRIER DATA MULTIMETER TESTS CONSTANT-CURRENT TESTS
Model
No.
Safety
Description
End-to-end
Resistance
Ω
Diode
Test
+ve
Diode
Test
-ve
Terminal
Voltage
@ 10µA
Terminal
Voltage
@ 20mA
V Ω mA Min Max Min Max Min Max
7758+ 7. 5 10 750 14 17 ∞ Vf
z
x 1 6 6.9 6.6 7
7758- 7. 5 10 750 14 17 ∞ Vf
z
x 1 6 6.9 6.6 7
7764+ 12 1k 12 1010 1050 ∞ Vf
z
x 1 10 11. 4 10.5 11. 6
7764- 12 1k 12 1010 1050 ∞ Vf
z
x 1 10 11. 4 10.5 11. 6
7767+ 15 100 150 110 119 ∞ Vf
z
x 1 12 13.6 12.4 13.7
7779+ 28 300 93 3 11 333 ∞ Vf
z
x 2 25.9 26.3 26 26.5
7796+ 26 300 87 3 11 333 ∞ Vf
z
x 2 23.9 24.4 24 24.6
7796+ (ch2) 20 390 51 401 428 ∞ Vf
z
x 2 18.3 18.8 18.4 19
7796- 26 300 87 3 11 333 Vf
z
x 2 ∞ 23.9 24.4 24 24.6
7796- (ch2) 20 390 51 401 428 Vf
z
x 2 ∞ 18.3 18.8 18.4 19
7788+ 28 300 93 3 11 333 ∞ Vf
z
x 2 25.9 26.4 26 26.6
7788+ (ch2) 10 50 200 62 75 ∞ Vf
z
x 1 6 9.5 6.6 9.7
7788R+ 28 300 93 3 11 333 ∞ Vf
z
x 2 25.9 26.4 26 26.6
7788R+
(ch2)
10 50 200 62 75 V
r
V
r
0 0 6.2 6.8
BARRIER DATA MULTIMETER TESTS CONSTANT-CURRENT TESTS
Model
No.
Safety
Description
End-to-end
Resistance
Ω
Diode
Test
+ve
Diode
Test
-ve
Terminal
Voltage
@ 10µA
Terminal
Voltage
@ 20mA
V Ω mA Min Max Min Max Min Max
7710+ 10 50 200 62 75 ∞ Vf
z
x 1 6 9.5 6.6 9.7
7710- 10 50 200 62 75 ∞ Vf
z
x 1 6 9.5 6.6 9.7
7715+ 15 100 150 110 119 ∞ Vf
z
x 1 12 13.6 12.4 13.7
7715P+ 15 50 291 59 64 ∞ Vf
z
x 1 12.6 13.3 13 13.4
7722+ 22 150 147 159 174 ∞ Vf
z
x 2 19.6 20.9 19.7 21.1
7722- 22 150 147 159 174 ∞ Vf
z
x 2 19.6 20.9 19.7 21.1
7728+ 28 300 93 3 11 333 ∞ Vf
z
x 2 25.9 26.5 26 26.7
7728- 28 300 93 3 11 333 Vf
z
x 2 ∞ 25.9 26.5 26 26.7
7728P+ 28 237 119 241 252 ∞ Vf
z
x 3 24.9 25.5 25 25.6
7729P+ 28 164 170 171 184 ∞ Vf
z
x 3 24.9 25.5 25 25.6