Tektronix CPS250 User Manual download pdf (Page 19)

Reference

CPS250 User Manual

CAUTION. To prevent electric shock, do not elevate any power supply

output terminals with any external voltage source or power supply.

Table 1: Independent Ground-Referenced Voltage Combinations

5-Volt Supply A-Supply B-Supply

+5 V, fixed 0 to +20 V 0 to +20 V

+5 V, fixed 0 to +20 V 0 to –20 V

+5 V, fixed 0 to –20 V 0 to +20 V

+5 V, fixed 0 to –20 V 0 to –20 V

–5 V, fixed 0 to +20 V 0 to +20 V

–5 V, fixed 0 to +20 V 0 to –20 V

–5 V, fixed 0 to –20 V 0 to +20 V

–5 V, fixed 0 to –20 V 0 to –20 V

Figure 4 on page 10 shows an example of a circuit with the +5 volt

terminal referenced to ground and both the A and B supplies

referenced to –5 V. In this configuration, each of the positive-going

20 V supplies can be varied from –5 V to +15 V (+20 V overall). The

GND post becomes the negative terminal for the A and B outputs.

The V meter will indicate 0 V when the output is –5 V, 5 V when the

output is zero, and 20 V when the output is 15 V. Negative 5 V is

taken between GND and the black (–) post of the 5 V, 2 A output. To

set up this configuration, proceed as follows:

1. Turn the CPS250 POWER to OFF. Connect the outputs as

shown in Figure 4 on page 10.

2. Set the A and B VOLTAGE controls to MIN and the A and B

CURRENT controls to midrange.

3. Turn POWER to ON. The V meter should read 0 V in both the A

and B position. An external meter connected across the load or

load terminals should read –5 V.

4. Turn POWER to OFF, and connect the load(s).

5. Turn POWER to ON, and readjust voltages if necessary.

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Tektronix CPS250 User Manual Page 19