Test Tables For Passive Barriers - Eaton MTL7700 Instruction Manual

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.
BARRIER DATA
Model Safety
No . Description
V Ω
7710+ 10 50
7710- 10 50
7715+ 15 100
7715P+ 15 50
7722+ 22 150
7722- 22 150
7728+ 28 300
7728- 28 300
7728P+ 28 237
7729P+ 28 164
Table 4: Single channel polarised barriers
BARRIER DATA
Model Safety
No . Description
V Ω
7758+ 7 .5 10
7758- 7 .5 10
7764+ 12 1k
7764- 12 1k
7767+ 15 100
7779+ 28 300
7796+ 26 300
7796+ (ch2) 20 390
7796- 26 300
7796- (ch2) 20 390
7788+ 28 300
7788+ (ch2) 10 50
7788R+ 28 300
7788R+ 10 50
(ch2)
Table 5: Dual channel polarised barriers
Note: Vf is the voltage dropped by a forward biased zener diode - 0.6V typically
z
V is the voltage dropped by the sense and current limit resistors - 3.2V for a typical 1mA test current
r
INM 7700 Rev 12
MULTIMETER TESTS
End-to-end Diode
Resistance Test
Ω +ve
mA Min Max
200 62 75 ∞
200 62 75 ∞
150 110 119 ∞
291 59 64 ∞
147 159 174 ∞
147 159 174 ∞
93 311 333 ∞
93 311 333 Vf
z
119 241 252 ∞
170 171 184 ∞
MULTIMETER TESTS
End-to-end Diode
Resistance Test
Ω +ve
mA Min Max
750 14 17 ∞
750 14 17 ∞
12 1010 1050 ∞
12 1010 1050 ∞
150 110 119 ∞
93 311 333 ∞
87 311 333 ∞
51 401 428 ∞
87 311 333 Vf
z
51 401 428 Vf
z
93 311 333 ∞
200 62 75 ∞
93 311 333 ∞
200 62 75 V
CONSTANT-CURRENT TESTS
Diode Terminal
Test Voltage
-ve @ 10µA
Min Max
Vf x 1 6 9.5
z
Vf x 1 6 9.5
z
Vf x 1 12 13.6
z
Vf x 1 12.6 13.3
z
Vf x 2 19.6 20.9
z
Vf x 2 19.6 20.9
z
Vf x 2 25.9 26.5
z
x 2 ∞ 25.9 26.5
Vf x 3 24.9 25.5
z
Vf x 3 24.9 25.5
z
CONSTANT-CURRENT TESTS
Diode Terminal
Test Voltage
-ve @ 10µA
Min Max
Vf x 1 6 6.9
z
Vf x 1 6 6.9
z
Vf x 1 10 11.4
z
Vf x 1 10 11.4
z
Vf x 1 12 13.6
z
Vf x 2 25.9 26.3
z
Vf x 2 23.9 24.4
z
Vf x 2 18.3 18.8
z
x 2 ∞ 23.9 24.4
x 2 ∞ 18.3 18.8
Vf x 2 25.9 26.4
z
Vf x 1 6 9.5
z
Vf x 2 25.9 26.4
z
V 0 0
r r
14
Terminal
Voltage
@ 20mA
Min Max
6.6 9.7
6.6 9.7
12.4 13.7
13 13.4
19.7 21.1
19.7 21.1
26 26.7
26 26.7
25 25.6
25 25.6
Terminal
Voltage
@ 20mA
Min Max
6.6 7
6.6 7
10.5 11.6
10.5 11.6
12.4 13.7
26 26.5
24 24.6
18.4 19
24 24.6
18.4 19
26 26.6
6.6 9.7
26 26.6
6.2 6.8