B&K 1651A, 1652 instruction manual Parallel Tracking Operation

OPERATING INSTRUCTIONS___________________________________________________________________________

b. Similarly, the positive polarity can be grounded by strapping the red (+) terminal of the “A” supply to the green (GND) terminal as shown in Fig. 8B.

c. If “split supply” operation is desired, a positive and negative voltage with a center ground can be achieved by strapping the black (-) terminal of the “A” supply to the green (GND) as shown in Fig. 8C. See the APPLICATIONS section of this manual for more information on “split supply” operation.

d. If an earth ground reference is not required, the configuration of Fig. 8D may be used. The scheme in Fig. 8D should also be used where it is not known whether the chassis is common with either the positive or negative polarity.

e. If the chassis or common of the equipment being powered is separate from both the positive and negative polarity power inputs, use the connection shown in Fig. 8E.

9.Observe proper polarity. If the circuit being powered is not equipped with reverse polarity protection, damage to the circuit can result from reverse polarity. Use color coded hook-up leads, for convenience in identifying polarity, red for (+) and black for (-).

10.Make sure that the hook-up leads offer sufficient current capability and low resistance between the power supply and the circuits being powered. The hook-up leads supplied with the power supply are rated for 4 amps.

PARALLEL TRACKING OPERATION
In the parallel tracking mode of operation, both supplies
are strapped together (in parallel). This allows for a 0-24 V
supply with a 1 amp current capability. Only the “A”	22

output terminals are used for parallel tracking operation. In the parallel tracking mode, the “B” supply output voltage and current track the “A” supply output voltage and current.

1.Set the power supplies t TRACKING PARALLEL mode by setting the TRACKING/INDEPENDENT switch to the PARALLEL (middle) position.

2.Set the A/B Metering switch to the A (up) position. Output voltage will be read from the Volt meter. Output current is exactly DOUBLE the value read from the mA meter (because each supply is providing the same amount of current).

3.The “B” VOLTAGE and CURRENT controls are disabled; turn both to their minimum positions. The maximum current and voltage are set using the “A” controls. Using the “A” supply output jacks, follow the

instructions for “Setting Current Limit”

(INDEPENDENT USE OF “A” OR “B” SUPPLY paragraph of this section). Remember that the actual current output at the “A” supply output jacks is double the reading on the mA meter.

4.Adjust the output voltage to the desired level using the “A” VOLTAGE control.

5.Turn off the power supply and the equipment to be powered during hook-up.

6.Connect the positive polarity of the device being powered to the red (+) terminal of the “A” power supply.

7.Connect the negative polarity of the device being powered to the black (-) terminal of the “A” power supply.

8.Fig. 9 illustrates the grounding possibilities when used in the TRACKING PARALLEL mode.