702 / | HD | DATA PROCESSING: MEASURING, CALIBRATING, OR TESTING |
1 | DF | MEASUREMENT SYSTEM IN A SPECIFIC ENVIRONMENT {6} |
57 | DF | .~ Electrical signal parameter measurement system {6} |
60 | DF | .~.~ Power parameter {2} |
61 | .~.~.~ Power logging (e.g., metering) {1} | |
62 | DF | .~.~.~.~> Including communication means |