Power Quality Analyzer Model 3945-B
17
CHAPTER 3
SPECIFICATIONS
3.1 Reference Conditions
Parameter
Reference Conditions
Ambient temperature
73°F ± 5°F (23°C ± 3°C)
Humidity
45%
Atmospheric pressure
25.4" Hg to 31.3" Hg (860 to 1060 hPa)
Phase voltage
230Vrms and 110Vrms ±2% without DC
Clamp current circuit input voltage
0.03V to 1Vrms without DC (<0.5%)
AmpFlex
®
current circuit input voltage
11.8mV to
118mVrms without DC (<0.5%)
Frequency of electricity network
50 and 60Hz ± 0.1Hz
V/I phase shift
0° active power / 90° reactive power
Harmonics
<0.1%
The uncertainties given for power and energy measurements are maximum for Cos
ϕ
= 1 or Sin
ϕ
= 1
and are typical for the other phase shifts.
NOTE:
The symbol “U” will be used throughout this manual and in the
instrument to refer to phase-to-phase voltage measurement.
The symbol “V” will be used for phase-to-neutral voltage measurement.
*All specifications are subject to change without notice.
3.2 Electrical Specifications
Sampling Frequency (256 samples per cycle):
12.8kHz samples/sec per channel @ 50Hz
15.36kHz samples/sec per channel @ 60Hz
Memory Size:
4MB
Memory Partition:
Data Logging - 2MB; Waveform capture - XXMB;
Transient capture -XXB; Alarms - XXB
3.2.1 Voltage Inputs
Operating Range:
Phase-Phase - 960Vrms AC/DC
Phase-Neutral - 480Vrms AC/DC
Input Impedance:
340k
Ω
between phase and neutral
Overload:
1.2Vn permanently; 2Vn for 1 sec (Vn = nominal voltage)