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HP E1312A and HP E1412A Multimeter Specifications 175Appendix A
AC Characteristics (continued)
Measuring Characteristics
Measurement Noise Rejection [7]
AC CMRR 70 dB
True RMS AC Voltage
Measurement Method: AC-coupled True RMS - measures the ac component of the input with up to
300Vdc of bias on any range (max AC + DC = 300Vrms).
Crest Factor: Maximum 5:1 at full scale
AC Filter Bandwidths: 3Hz-300kHz (Slow filter)
20Hz-300kHz (Medium filter)
200Hz-300kHz (Fast filter)
Input Impedance: 1M
Ω ± 2%, in parallel with 100pF
Input Protection: 300Vrms all ranges
True RMS AC Current
Measurement Method: Direct coupled to the fuse and shunt. AC-coupled True RMS measurement
(measures the ac component only).
Shunt Resistor: 0.1
Ω for 1A and 3A ranges
Burden Voltage: 1A range: <1Vrms
3A range: < 2Vrms
Input Protection: Externally accessible 3.15A, 250V, Class H fuse
Class H fuses are fuses with a high interrupt rating which defines a fuse’s ability
to safely interrupt and clear short circuits. Replace the fuse with HP part number
2110-0957, (3.15A, 250V, 5.0 mm diameter, 20.0 mm long) or use Cooper Industries
Inc. fuse part number GDA-3.15.