With the launch of the Battery Unit option (option 23/85), Pendulum Instrument’s CNT-90XL family of Microwave Counters/Analyzers now gets truly portable operation. Operation time in field use is 4.5 to 8 hours depending on actual configuration. In stand-by mode, the battery unit can supply an internal OCXO (Oven Controlled X-tal Oscillator) for over 24 hours. This option also has an external DC 10-18 V input for use in vehicles. The battery can be replaced in about 5 to 10 minutes using standard tools.