Troubleshooting
2-75
Test 401.1 – Signal switching; zero cal switch
Pass/Fail
Cannot measure 0V ±0.001V at A/D IN.
Common is routed to the ACF line through U526 (SHORT pulled low). ACF is then
routed through multiplexer U511. The output of the multiplexer (OUT) follows the
same path to the A/D buffer (U322) as the 400 series tests. U322 is conÞgured for x1
gain. Measure 0V at A/D IN.
DC_STB
Registers
R1_STB
Registers
R2_STB
Registers
U801
Q1:
0
Q2:
1
Q3:
1
Q4:
1
Q5:
1
Q6:
0
Q7:
0
Q8:
0
U307
Q1:
1
Q2:
1
Q3:
0
Q4:
1
Q5:
1
Q6:
1
Q7:
1
Q8:
1
U505
Q1:
1
Q2:
0
Q3:
1
Q4:
0
Q5:
0
Q6:
0
Q7:
0
Q8:
0
U800
Q1:
1
Q2:
1
Q3:
0
Q4:
0
Q5:
0
Q6:
0
Q7:
1
Q8:
1
U305
Q1:
1
Q2:
0
Q3:
1
Q4:
0
Q5:
0
Q6:
0
Q7:
1
Q8:
1
U500
Q1:
1
Q2:
1
Q3:
0
Q4:
1
Q5:
1
Q6:
1
Q7:
0
Q8:
1
U300
Q1:
1
Q2:
1
Q3:
1
Q4:
1
Q5:
1
Q6:
1
Q7:
1
Q8:
1
U302
Q1:
1
Q2:
1
Q3:
1
Q4:
1
Q5:
1
Q6:
1
Q7:
1
Q8:
0
U530
Q1:
1
Q2:
1
Q3:
1
Q4:
0
Q5:
1
Q6:
0
Q7:
0
Q8:
0
U303
Q1:
0
Q2:
1
Q3:
1
Q4:
1
Q5:
0
Q6:
1
Q7:
X
Q8:
X
U501
Q1:
1
Q2:
1
Q3:
0
Q4:
1
Q5:
1
Q6:
1
Q7:
X
Q8:
X
Note: Tables 2-10 through 2-12 provide functional descriptions of the register bits.
Type
Failure analysis
Description
Bit pattern
Содержание 2001
Страница 1: ...Model 2001 Multimeter Repair Manual Contains Servicing Information...
Страница 129: ...Troubleshooting 2 116...
Страница 139: ...Replaceable Parts 4 4...
Страница 149: ...Replaceable Parts 4 14...
Страница 153: ...Replaceable Parts 4 18...
Страница 156: ...A Model 2001 Specifications A 1...
