Amprobe DM-4 Power-Quality-Recorder - Manual (Page 42)

13. TECHNICAL SPECIFICATIONS
13.1 FEATURES
The accuracy is stated as [1% of the reading ± number of 2 digits]. It refers to the
following atmospheric conditions: temperature 73°F± 2°F (23°C ± 1°C) with rela-
tive humidity < 75%.
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DM-4 Power Quality Recorder
13.1.1 Voltage Measurement
Range Accuracy Resolution Input Impedance
20-370V ±(3%+2digit) 0.1V 300kΩ (phase-neutral)
310-635V 0.1V 600kΩ (phase-phase)
13.1.2 Voltage Anomalies Detection (Manual Selection of Range) Voltage
Range Accuracy Resolution Input Impedance
20-370V ±(3%+2digit) 0.1V 300kΩ (phase-neutral)
310-635V 0.1V 600kΩ (phase-phase)
Time
Accuracy (ref. to 60Hz) Resolution
±8.33ms (
1/2
period of fundamental) 8.33ms (
1/2
period of fundamental)
13.1.3 Current Measurement (Using external transducer)
Range Accuracy Resolution Input
Impedance
Protection against
overloads
0.005-0.26V ±(2%+2digit) 100kΩ 5V
0.26-1V
Minimal Current measurable is equal to 0.5% of Clamp Full Scale