B&K Precision 1762 - Manual - Manual (Page 22)

22
OPERATING INSTRUCTIONS
SERIES TRACKING OPERATION
When the series tracking mode of operation is selected, the positive
(red) terminal of the “B” supply output is internally connected to the
negative (black) terminal of the “A” supply. This allows the power
supply to be used as a single 0-to-60 volt power supply simply by
using the negative (black) terminal of the “B” supply and the positive
(red) terminal of the “A” supply.
In the series tracking mode, the maximum output voltage of both
the “A” and “B” supplies can be simultaneously varied with one
control. The maximum “B” supply voltage can be set to the same
value of the “A” supply by setting the “B” Coarse and Fine
VOLTAGE controls fully clockwise, so that “B” is set to 100%
tracking.
Simultaneous metering of both current and voltage can be obtained
in this mode of operation by setting one of the displays for current
metering and one for voltage metering. In this case, the output voltage
(across the two supplies) is actually double the displayed value. For
example, if the “B” display is set for voltage metering and the “A”
display for current metering, the output voltage across the “A”
positive (red) terminal and the “B” negative (black) terminal would
be double the reading on the “B” LED Display (since both supplies
are putting out the same voltage). The actual output current would be
the value read from the “A” LED Display.
8. Set the power supplies to the TRACKING SERIES mode by
engaging the INDEP/TRACK switch and releasing the
SER/PAR switch.
1. Set the 0-30 V/4-6.5 V switch to the 0-30 V
position, the “B” V/A switch to the V (voltage
metering) position, and the “A” V/A switch to the A
(current metering) position.
2. Set the “B” Coarse and Fine Voltage and
CURRENT controls to the fully clockwise position.
The maximum current is set using the “A”
CURRENT control. Follow the instructions for
“Setting Current Limit” (INDEPENDENT USE OF
“A” OR “B” SUPPLY section of this manual) using
the “A” CURRENT control.
3. Adjust the output voltage to the desired level using
the “A” VOLTAGE controls (remember that the
actual output voltage is double the reading on the
“B” LED Display).
4. Turn off the power supply and the equipment to be
powered during hook-up.
5. Connect the positive polarity of the device being
powered to the red (+) terminal of the “A” power
supply.
6. Connect the negative polarity of the device being
powered to the black (-) terminal of the “B” power
supply.
7. Fig. 8 illustrates the grounding possibilities when
the unit is used as a 0-to-60 volt supply.
a. If the negative polarity of the equipment or circuit
being powered is also the chassis or common, it
may be grounded to earth by strapping the black
(-) terminal of the “B” supply to the green (
)
terminal of the “B” supply as shown in Fig. 8A.