ACL MODEL #600
CALIBRATION INSTRUCTIONS

1. Connect 1-volt supply to the input meter i.e. 0 volt to ground, and 1 volt to the end of R12, which is connected to U1 (31). Monitor this voltage with your Digital Volt Meter (D.V.M.), and adjust VR1 until the reading matches the D.V.M. (The 1 volt supply can be an ordinary AA cell.)
   
   
2. Power ACL 600 with a variable supply set to 6.5 volts and monitor this with your Digital Volt Meter. Adjust VR2 until the "LOBAT" indication just comes on.