Campbell Scientific CR800 and CR850 Measurement and Control Systems - Manual (Page 416)

Section 10. Troubleshooting
416
Battery Test
If using a rechargeable power supply,
disconnect the charging source (i.e., solar panel
or AC transformer) from the battery pack.
Wait 20 minutes before proceeding with this
test.
Test Voltage at Charging Regulator
Set a voltmeter to read DC voltage as high as
15 Vdc. Measure the voltage between a 12V
and G terminal on the charging regulator.
Is the voltage > 11.0 Vdc?
No
Yes
No
Is the battery a sealed, rechargeable
battery?
No
Yes
Test the Battery Under Load
Program the CR800 to measure battery voltage
using a 0.01-second scan rate. Use the
voltmeter to measure the voltage between a
12V and G terminal on the charging regulator.
Is the voltage > 10.8 Vdc?
Is the voltage ≥ 10.5 Vdc?
No
Replace battery / batteries*
Yes Yes
Recharge battery.*
Is the battery voltage > 12 Vdc?
No
Yes
The battery is good.
Battery voltage is adequate for CR800 operation. However, if the CR800 is to function
for a long period, Campbell Scientific recommends replacing, or, if using a sealed,
rechargeable battery, recharging the battery so the voltage is > 12 Vdc.
*When using a sealed, rechargeable battery that is recharged with primary power provided by solar panel or ac/ac - ac/dc transformer, testing the
charging regulator is recommended. See Charging Regulator with Solar Panel Test
(p. 416) or Charging Regulator with Transformer Test (p. 418).
10.5.3.2 Charging Regulator with Solar-Panel Test
The procedure outlined in this flow chart tests PS100 and CH100 charging
regulators that use solar panels as the power source. If a need for repair is
indicated after following the procedure, see Warranty and Assistance
(p. 3)
for
information on sending items to Campbell Scientific.