Dwyer MTL7787 - Manual (Page 19)

15 INM7700-6 Jan 2010
Table 6: Single channel
BARRIER DATA MULTIMETER TESTS CONSTANT-CURRENT TESTS
MTL Safety End-to-end Diode Diode Terminal Terminal
model Description Resistance Test Test Voltage Voltage
No. Ω Ω +ve -ve @ 10 μμA @ 20mA
V Ω Ω mA Min Max Min Max Min Max
7728ac 28 300 93 311 333 ∞ ∞ 25 26.7 25.6 27.2
BARRIER DATA MULTIMETER TESTS CONSTANT-CURRENT TESTS
MTL Safety End-to-end Diode Diode Terminal Terminal
model Description Resistance Test Test Voltage Voltage
No. Ω Ω +ve -ve @ 10 μμA @ 20mA
V Ω Ω mA Min Max Min Max Min Max
7761ac 9 90 100 98 107 ∞ ∞ 6 8.6 6.9 8.9
7761Pac 9 350 26 361 378 ∞ ∞ 6.8 8.6 7.7 8.9
7764ac 12 1k 12 1010 1050 ∞ ∞ 10 11.6 10.8 11.9
7766ac 12 150 80 159 174 ∞ ∞ 10 11.6 10.8 11.9
7766Pac 12 75 157 84 92 ∞ ∞ 9.6 10.9 10.4 11.2
Table 7: Dual-channel ac barriers
BARRIER DATA MULTIMETER TESTS CONSTANT-CURRENT TESTS
MTL Safety End-to-end Diode Diode Terminal Terminal
model Description Resistance Test Test Voltage Voltage
No. Ω Ω +ve -ve @ 10 μμA @ 20mA
V Ω Ω mA Min Max Min Max Min Max
7760ac 10 50 200 62 75 ∞ ∞ 6 9.5 6.9 9.8
7765ac 15 100 150 112 124 ∞ ∞ 12 14.1 12.7 14.4
7778ac 28 600 47 614 651 ∞ ∞ 24.0 24.4 25.4 26.0
Table 9: Dual-channel star-connected ac barriers
BARRIER DATA MULTIMETER TESTS CONSTANT-CURRENT TESTS
MTL Safety End-to-end Diode Diode Terminal Terminal
model Description Resistance Test Test Voltage Voltage
No. Ω Ω +ve -ve @ 10 μμA @ 20mA
V Ω Ω mA Min Max Min Max Min Max
7755ac 3 10 300 15 19 Vf
d
x 3 Vf
d
x 3 1 2.1 1.8 2.4
7756ac 3 10 300 15 19 Vf
d
x 2 Vf
d
x 2 0.7 1.4 1.2 1.6
Table 8: 2/3 channel low voltage ac barriers
Note: Vf
d
is the voltage dropped by a forward biased rectifier diode - 0.6V typically