VOLTAGE MEASUREMENT
“Batteries must be tested with high
accuracy to ensure their proper operation”
protects the instrument from harmful
voltages. Without the common mode noise,
the acquired data reflects the true signal
data. Data analysis can be performed and
test results become much more reliable
and accurate.
HIGH SAMPLING RATE WITH
TEMPERATURE MEASUREMENT
The performance of a battery depends on
its slew rate. The batteries under test are
often charged and discharged repeatedly
while a voltage DAQ instrument
continuously monitors the voltage of the
batteries. During the test, the slew rates of
the battery are monitored. As a result, a
battery discharge curve can be obtained,
the battery life can be calculated and the
number of recharge cycles can be
determined based on the analysis of the
slew rates.
In order to obtain a perfect battery
discharge curve to characterize a battery, a
high amount of voltage data is acquired at
a high data sampling rate over a long
period of time. The DAQ instrument is
required to capture the changes in this
voltage at the millisecond level. At least
1000 data points per second are required,
so the DAQ instrument has to support a
sampling rate of at least 1k Sa/s.
Furthermore, the temperature of the
battery must be monitored in the
meantime to ensure the batteries do not
overheat and cause damage when an
aggressive current is applied. Along with
AEROSPACETESTINGINTERNATIONAL.COM // SHOWCASE 57
1 // The EX1401 provides up to 500V of
channel-to-ground isolation to safeguard
against high common mode noise
2 // A typical battery discharge curve
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/AEROSPACETESTINGINTERNATIONAL.COM