Performance Checks - Lambda LJS-13A Series Instruction Manual

b) Dip the wick in liquid rosin flux.
c) Place the wick onto the soldered connection and apply 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 Variac to vary the line voltage from 105-132 or 132-105 volts AC and check the power supply
line regulation accuracy on the DVM differential meter.
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.
ADJUSTMENT OF CALIBRATION CONTROL VR2.
Whenever voltage and current indications do not reflect maximum ratings, adjust VR2 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 stablized 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 132 VAC, 60 Hz.
4. Turn voltage adjust control until minimum rated output voltage is obtained.
5. Apply load so that output current is 130-150% 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. After adjustment is completed, remove AC input power to the supply and reseal wiper of VR2.
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