When I connect a power monitor module to the DR232 and measure power (input 100 V/1 A, range: 250 V/5 A)the phase and power factor values are "-*****".

Measuring conditions

1. Measured values cannot be guaranteed if the measuring range of the input is not of the conditions below.
   10% of measurement range < voltage, current < 100%
2. If the apparent power input (VA) is 10% of the range or less, the phase and power factor cannot be measured, and "-*****" results.
   Ex) In the above measurement, if the measurement range is 250 V/5 A, and the input is 100 V/1 A, determining VA from the measuring range gives VA=250×5=1250, and 10% of this is 125 VA. On the other hand, the input is 100 × 1 = 100 VA. Since the apparent power input (VA) is less than 10% of the range, phase and power factor cannot be measured, and the result is "-*****".
3. When the measurement range and wiring are changed, up to 2 scans worth of data after the change are invalidated.