Performance Checks - Lambda LJS-12 Series Instruction Manual

c) Place the wick onto the soldered connection and applv soldering iron onto the wick.
d) When sufficient amount of solder flows onto the wick, freeing the component, simultaneously remove
iron and wick.
PERFORMANCE CHECKS
Check the ripple and regulation of the power supply using the test connection diagram shown in figure 9.
Use suggested test equipment or equivalent to obtain accurate results. Refer to SPECIFICATIONS AND
FEATURES for minimum performance standards.
Set the differential meter, DC DVM (John Fluke Model 891A or equivalent) to the selected power supply
operating voltage. Check the power supply load regulation accuracy while switching from the no load to load
condition. Long load leads should be a twisted pair to minimize AC pick-up.
Use a TVM, John Fluke Model 931B or equivalent, to measure rms ripple voltage of the power supply DC
output. Use oscilloscope to measure peak-to-peak ripple voltage of the power supply DC output.
Use a VTVM, Ballantine 320 or equivalent, to measure rms ripple voltage of the power supply DC output.
Use oscilloscope to measure peak-to-peak ripple voltage of the power supply DC output.
ADJUSTMENT OF CALIBRATION CONTROLS VR2, VR3.
Whenever voltage and current indications do not reflect maximum ratings, adjust VR2 and VR3 as
follows. The adjustment procedure requires that the power supply is removed from associated equipment, is at
an ambient temperature of 25-30?C, and is stabilized and not operating.
1. Remove AC input power to the supply.
2. Break seal on wiper of VR2 from resistor housing and turn to full CCW position.
3. Operate power supply for constant voltage with local sensing connected as shown in figure 3, with no
external load, and with AC input of 117V AC, 50/60Hz.
4. Turn voltage adjust control until minimum rated output voltage is obtained.
5. Apply load so that output current is 110-115% of 50°C rating for the unit.
6. Using a differential meter, DC DVM (John Fluke Model 891A or equivalent), observe output voltage
while adjusting VR2 in CW direction. Adjust VR2 until output voltage drops.
7. Remove AC power input to the supply.
8. Break seal on wiper of VR3 from resistor housing.
9. Operate power supply for constant voltage with remote sensing connected as shown in figure 4, with AC
input 117VAC, 50/60Hz.
10. Adjust VR3 to the same operating point as described above.
11. Repeat steps 3 through 10 until no further adjustment is required.
12. After adjustment is completed, remove AC input power to the supply and reseal wipers of VR2 and
VR3.