Campbell Scientific CR800 and CR850 Measurement and Control Systems - Manual (Page 418)

Section 10. Troubleshooting
418
10.5.3.3 Charging Regulator with Transformer Test
The procedure outlined in this flow chart tests PS100 and CH100 charging
regulators that use ac/ac or ac/dc transformers as 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.