B&K Precision 1686A - Manual - Manual (Page 15)

15
MAINTENANCE
2. Remove the ten screws that hold the case top to the chassis and
front bezel.
3. Pull the front bezel away from the chassis to access the
calibration adjustments.
VOLTAGE AND V METER ADJUSTMENTS
1. Connect the multimeter (set to 20 DCV Range) to measure the
dc voltage across the power supply (+) and (–) OUTPUT
terminals.
2. Turn on the power supply, and set the front panel VOLTAGE
control maximum (fully clockwise).
3. Adjust Trimmer VR3 for a reading of 14.50 ± 0.10 volts on the
multimeter.
4. Set the power supply front panel VOLTAGE control for a
reading of 14.00 ± 0.10 volts on the multimeter.
5. Adjust Trimmer VR4 so that the meter pointer on the V meter
lines up with the 14 volt mark.
6. Turn off unit power to proceed to the current adjustments.
CURRENT AND A METER ADJUSTMENTS
1. Connect the 0 to 2 ohm resistive load in series with the
multimeter (set to 20 DCA Range) to measure the dc output
current across the power supply (+) and (–) OUTPUT
terminals.
2. Turn on the power supply and adjust the resistive load for a
reading of 10.0 ± 0.1 amps on the multimeter.
Figure 6. Location of Calibration Adjustments, Rear View.