Service manual

Replaces page 23 95
Table 3-3. Test Points (continued)
Test Point
Number
Signal Measurement and Conditions
U16-1
CC Loop Gain
control
+ 15V when input voltage is more than 2.5V.
-15V when input voltage is less than 2.5V.
NOT USED
U9-1
RNG Low level when the high current range or the middle resistance range is
programmed.
High level when the low current range, the low resistance range, or the high
resistance range is programmed.
U14-1 U15-1*
-VMON -0.167 X Input Voltage (e.g. -0.167 X 60 = -10.02V).
cath-D11
+OP -0.9V (full rated voltage input) to -6V (zero volts input) when the OP condition is
false. Pulses when the OP condition is true. See test point
.
U10-1,2,13,14
- OP -14V when the OP condition is false. Pulses when the OP condition is true. See
Figure 3-10.
U17 -1
-VMONA -0.167 X Input Voltage (e.g. 0.167 X 60 = - 10.02V).
U9-16
EPC_EN Low level when extended power is available.
High level when extended power is not available.
U12-1
OP circuit -10V when input is at full rated current with extended power not available.
-8.5V when input is at full rated current with extended power available.
U12-7
OP circuit Same as above except when input is at full rated voltage.
cath-D55
OC circuit
control
+ 13V when OC condition false (normal). + 8V when OC condition is true or when
input stages are unregulated.
Q11-E
OC circuit
control
+ 10V when OC condition is false (normal).
+8.5V when unregulated or when OC condition is true.
cath-D23
Input Power
Stage Turn on
+5V when turned on. 0V when turned off.
U5-1 U5-7*
Input Power
Stage 2 D
6.3V (approx.) with full rated current input.
-0.5V (approx.) with the input off.
Q2-1
Input Power
Stage 2 D
5.4V (approx.) with full rated current input.
4.0V (approx.) with 10% rated current input.
-0.5V (approx.) with zero current input.
U6-7 U6-1*
Input Power
Stage 2 D
Approximately 0.167 X In/8 (e.g. 0.167 X 0.5 X 60/8 = 1.25V)
U15-1 U14-1*
-IMON -0.167 X Input current (e.g., .167 X 60 = -10.02V)
Note: Pin Numbers on 60504A are marked by *.