Agilent Technologies 6674A

Diagrams 121
Table 6-3. Troubleshooting Test Points (continued)
TEST POINT
No. & Loc.
Signal Tested Measurement and Conditions
A5 Control Board
+C558 Secondary common (Sheet 1) Connect meter or scope common here. Then make measurements
at test points
through
and
through
U505-6 CC/CC DACs reference
(Sheet 1)
+10 ± 0.05V
U517-7 Readback DAC reference
(Sheet 1)
-11.6 ± 0.1V
U508-6 CVPROG (Sheets 1,2) Approximately -4.6V (with voltage programmed 1/2 of full scale)
U510-6 CVPROG (Sheets 1,2) Approximately -4.1V (with voltage programmed 1/2 of full scale)
Note:
Measurements at test points through where taken under the following conditions:
1. Programming
a. Programming Voltage = ½ scale
b. Current = ½ scale
c. OV = full scale
2. First measurement in CV mode with no load.
3. Second measurement in CC mode with output shorted.
U615-1 VMON (Sheet 2) CV mode = +4.6V CC mode = 0V
U615-7 CV CONTROL (Sheet 2) CV mode = +2.4V CC mode = 12V
U630-2 CV* (Sheet 2) CV mode =0V CC mode = 5V
U618-1 CC CLAMP AMP output
(Sheet 2)
CV mode =+2.2V CC mode = +2.2V
U617-6 1ST I AMP output (Sheet 2) CV mode =0V CC mode = -0.6V
U612-7 2ND I AMP output (Sheet 2) CV mode =0V CC mode = +4.5V
U612-1 CC CONTROL (Sheet 2) CV mode =+15V CC mode = +0.4V
U630-3 CC* (Sheet 2) CV mode =+5V CC mode = 0V
U621
-1
FAST SENSE AMP
(Sheet 3)
CV mode = -4V CC mode = 0V
U607-7 RAMP GEN (Sheet 3) See Figure 6-1
U607-1 RAMP GEN (Sheet 3) See Figure 6-1
U602-9 DIVIDER output (Sheet 3) See Figure 6-1
U605-3 SUMMING POINT (Sheet 3) See Figure 6-1
U602-6 DEADTIME LATCH
(Sheet 3)
See Figure 6-1