DayStar DS-100c, User Manual

Page: 23 / 53

DS-100C Operating Manual page C15
significant and affect the accuracy of an I-V curve. Under most circumstances,
the DS-Tracer can be left in the V
HIGH
range. However, the low voltage range
will give a better curve of low voltage, high current PV systems (for example 60
Amps, 12 Volts). Refer to section 3.0 Theory for more details on DS-Tracer
capacitance.
NOTE: Leave the voltage range switch on the DS-Tracer in the HIGH position
unless taking a high current, low voltage I-V curve.
AC Power Entry & Fuse
The DS-Tracer battery is recharged by connecting the DS-Tracer to an AC power
source with the cord provided. It is not necessary for the tracer to be ON. Refer
to section 4.0 for details of battery charging.
ON-Off Switch
This switch turns on the DS-Tracer power. This switch should be on before
connections are made to a PV array. The curve tracer takes approximately 10
seconds to initialize after it is turned on. Be sure to allow for this before
attempting to use IVPC to operate the tracer. If you attempt to communicate with
the tracer before it completes initialization, you will receive an error in IVPC.
It makes no difference if it is on or off while connecting to the control computer.
Of course, it must be on to take an I-V curve. The DS-Tracer automatically turns
itself off if a curve has not be taken for 15 minutes. This feature protects the DS-
Tracer battery. If you suspect that the DS-Tracer has turned itself off, simply
switch the power switch off, wait several seconds, and turn the switch back on.
Full Charge Indicator
When this LED lights its indicates that the DS-Tracer battery is fully charged.
Sometimes this LED will turn on for several seconds if the AC power cord is
!