UT3550 Battery Tester Users Manual
15
3.3
Set Zero and Calibration
Before testing, please perform the short circuit zeroing step to remove the stray resistance and bias
voltage caused by the test lead or external environment factors.
The measured resistance value may be very small, such as 3
mΩ
and 30
mΩ range.
When the test current
flows through the resistance, the voltage signal generated will be very weak, and the maximum is only
a few mV, so the position, length and shape of the test lead may all have effects on the measurement.
Therefore, the positions and conditions during setting zero should be the same as those during
subsequent measurement.
3.3.1
Short-Circuit Test
Method of Short Circuit Zeroed
The first step
push
【
Utility
】
key to enter setup page
The second step
short contact test pen
The third step
use function key to select
【
F4 SET ZERO
】
The fourth step
push
【
F4 OK
】
, the instrument start to zeroing
The fifth step
When zeroing finfished, go back to setup page
Short Circuit Zeroed Method of Kelvin Test Lead
Correct Short Circuit Method of Crown Probe Test Pen
The center probe of the crown probe test pen is the Sense end, and the outer cylindrical probe is the
Source end.
First, place the probes of the crown probe test pen as shown in Figure 3-3-1-a. Make sure that the
surface of the object at the red dot is in contact, that is, the center probe is in contact with the center
probe (Sense and Sense). And the center probe is in contact with the peripheral probe (Sense and
Source).
