Keithley 6220

9-4 Limit Test and Digital I/O Model 6220/6221 Reference Manual
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Table 9-2
Limit test fail pattern values
Value* Out 4Out 3Out 2Out 1
0 LLLL
1 LLLH
2LLHL
3LLHH
4LHLL
5LHLH
6LHHL
7 LHHH
8 HLLL
9HLLH
10 HLHL
11 H L H H
12 H H L L
13 H H L H
14 HHHL
15 HHHH
*L = Grounded
H ≥ +3V
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