CRT-300 Basics
10
On some batteries (typically VRLA), the posts are inaccessible because they
are covered by the intercell connector. For valve regulated batteries, where
only the intercell and the mounting bolt are accessible, connect the current
lead to the bolt head and the voltage sensing lead to the intercell. Measuring
from bolt head to bolt head is not a true measure of the connection between
the post and intercell bar; in most cases, the reading will be high because of
the high resistance of the bolt itself. (Refer to
Application Note CC-002
.)
Most battery terminal posts have a layer of lead dioxide, lead sulfate, copper
oxide or dirt mixed with No-Ox grease. All are high in resistance, so make
sure the test leads have good connection to the metal surfaces.
6.5
Before Taking Measurements
Before taking cell measurements, charge the Cellcorder and confirm
calibration by reading a known voltage using a known shunt as an intercell
connector. Refer to
Using the Test Leads
to review good test lead connection
and to
Application Note CC-002
, which discusses internal resistance
measurement.
Before testing cell voltage or resistance, you should select a site, though this
is not mandatory. To create or select a site, refer to
Setting Up a Site Before
Test
and
Selecting a Site for Test
.
WARNING
: Do not test any cells when the Cellcorder AC Power indicator
is lit. Injury to personnel or damage to equipment could result.
6.6
Charging the Cellcorder
Prior to testing, charge the CRT-300 using the charger module until the
green Battery LED goes out. This LED indicates battery level only with the
charger connected. Charging may take several hours. If the battery wears
down during testing, do not use the charger for power when testing cells.
TIP
: A discharged battery does not affect data readings in temporary storage.
WARNING
: Do not test any cells when the Cellcorder AC Power indicator
is lit. Injury to personnel or damage to equipment could result.
Before charging, first disconnect any test leads from the CRT-300, then open
the accessory compartment cover by loosening the two slotted screws.
Connect the charger to the power connector inside the compartment, then
plug the charger into 115VAC. The Power AC and Battery LEDs light.
