Specifications

Section 19. Troubleshooting
19-9
19.4.3.3 Charging Circuit Test — Transformer
No No
Yes
Yes
Yes Yes
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No
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Yes
No
Yes
Disconnect any wires attached to the 12 V and ground terminals on the charging regulator (e.g., PS100, CH100, PS12LA).
Disconnect the battery from the charging circuit. Only the trans-former should be connected. The transformer should be
connected to 120 Vac.
Determine whether the transformer
output is an ac or dc voltage and
set the voltmeter to read that type
of voltage. Use a voltmeter to
measure the voltage output by the
transformer. Is the charging
voltage between 17 and 22 V?
Place a 5 kohm resistor between the
charger/regulator’s 12 V and ground
terminals. Use a voltmeter to measure the
dc voltage across the 5 kohm resistor. Is
the measured voltage between 13.3 and
Remove the transformer from the
charging circuit and measure the
transformer’s output voltage. Is
the charging voltage between
17 and 22 V?
Is the charger/regulator’s output voltage to
the battery between 10 and 15.5 V?
Test the Charger under a Load
Disconnect the charging source, remove the 5 kohm resistor, and place a 50 ohm, 1 watt resistor
between the 12 V output and ground of the charger. Use the voltmeter to measure the dc voltage
across the 50 ohm resistor. Is the voltage between 13.0 and 14.0 V?
NOTE: The resistor will get HOT; do not leave connected for more than a few seconds.
The transformer is defective
and should be replaced or
repaired by Campbell
Scientific. Call for an RMA
before returning the trans-
former.
Connect the transformer to the “CHG” terminals on
the charging regulator. Confirm that the battery is
disconnected and that nothing is connected to the 12 V
terminal. Is the voltage on the “CHG” terminal ≥17 V?
The regulator is defective and should be replaced or
repaired by Campbell Scientific. Call for an RMA
number before returning the regulator.
The charger is functioning properly. After removing
the 50 ohm resistor, the test is complete.
See “Adjusting Charging Circuit” section to cali-
brate the charging voltage or return item to CSI
for calibration. An RMA number is required to
have CSI calibrate the charging circuit.