B&K Precision 1762 - Manual - Manual (Page 40)

40
APPLICATIONS
Fig. 16. Typical Hook-Up Using Different Positive
and Negative Voltages and a Separate Common.
Differing Positive and Negative Voltages With a Separate
Common (Refer To Fig. 16)
Using both supplies and the series tracking mode of operation,
different positive and negative voltages with a separate common
utilizing the variable “B tracks A” mode of operation are obtained
as follows:
1. Select the TRACKing SERies operating mode and set up the
LED displays to monitor voltage.
2. Connect one ground strap between the ground terminal and
the negative terminal of the “A” supply and the other between
the ground terminal and the positive terminal of the “B”
supply.
3. Set the desired voltage for each supply using the VOLTAGE
controls. Set the maximum current using the CURRENT
controls.
4. Turn off the power supply and the equipment to be powered
during hook-up.
5. Connect the positive polarity input of the circuit to be
powered to the positive (red) terminal of the “A” supply and
connect the negative polarity of the circuit to the negative
terminal of the “B” supply. Connect the circuit ground to the
ground terminal of either the “A” or “B” supply.
6. If desired, set the LED displays to monitor current. The load
current will usually be different for each of the supplies in this
configuration.
7. The advantage of this configuration over the independent one
is that if the +12 V “A” supply is varied to simulate a -10% to
+10% voltage variation, the -5 V “B” supply will
automatically vary the same percentage.