Dwyer Instruments MTL7700 Series, Instruction Manual

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16 INM7700-6 Jan 2010
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
μμ
A @ 20mA
V
Ω Ω
mA Min Max Min Max Min Max
7787+ 28 300 93 311 333
∞
Vf
z
x 2 26.6 27.4 26.7 27.6
7787+ (ch2) 28 — —
∞
(+)
0.9V + 26
∞
Vf
z
x 2 26.6 27.4 26.7 27.6
7787P+ 28 237 119 241 253
∞
Vf
z
x 3 26.4 27.4 26.5 27.6
7787P+ (ch2) 28 — —
∞
(+)
0.9V + 26
∞
Vf
z
x 2 26.6 27.4 26.7 27.6
7789+ 38 300 93 614 651
∞
Vf
z
x 2 26.6 27.4 26.7 27.6
7789+ (ch2) 28 — —
∞
(+)
0.9V + 26
∞
Vf
z
x 2 26.6 27.4 26.7 27.6
Table 10: Diode return barriers
Note: Vf
z
is the voltage dropped by a forward biased zener diode - 0.6V typically