Service manual

23
Table 3-3. Test Points (continued)
Test Point
Number
Signal Measurement and Conditions
cath-D17
+ OV + 14V when OV condition is false (normal).
-13V when OV condition is true.
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)
NOT USED
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
(approx.) 6± .5V with full rated input current.
(approx.) -0.5V with the input off.
Q2-1
Input Power
Stage 2 D
(approx.) 5.2V with full rated input current.
(approx.) 4.0V with 10% rated input current.
(approx.) 2.5V at zero input current.
U6-7 U6-1*
Input Power
Stage 2 D
1.25V for 60501B, 60502B, 60503B, 60504B.
0.625V for 60507B at full input current.
U15-1 U14-1*
-IMON -10.02V at full input current.
*ON 60504B/07B ONLY.