Troubleshooting
2-11
2.7 R1_STB and R2_STB shift registers
Table 2-6 and Table 2-7 are provided to allow you to
check logic levels on the R1_STB and R2_STB shift reg-
isters (U302, U305, U307, U501, U530, U500 and U505)
for each basic measurement function (DCV, ACV, DCI,
ACI,
Ω
2 and
Ω
4) and range. The known bit pattern at
these registers can then be used for signal tracing
through the unit. Tables 2-11 and Table 2-12provide a
brief description of each register bit.
To use these tables, simply place the instrument in the
designated function and range and check the output of
the shift registers for the indicated bit pattern. The bit
patterns in these tables assume the following condi-
tions:
NPLC > 0.01
AC Type = RMS or Average
Offset Compensated Ohms = Off
Current Measurement Mode = Normal (No In-Circuit I)
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