AEMC 6418, Руководство пользователя

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18
Clamp-On Ground Tester Model 6418
3. TECHNICAL CHARACTERISTICS
3.1. GENERAL REFERENCE CONDITIONS
Quantities of influence Reference values
Temperature 73 ±5°F (23 ±3°C)
Relative humidity 50 ±10%RH
Supply voltage 6 ±0.2V
Electric field <1V/m
Magnetic field <40A/m
Operating position clamp horizontal
Position of the conductor in the jaws centered
Adjacent conductors carrying current in
impedance measurement
At least 3.9” (10cm)
Magnetic mass At least 3.9” (10cm)
Frequency 50Hz, sinusoidal
Level of distortion <0.5%
Current present in impedance measurement 0mA
The intrinsic uncertainty is the error defined under the conditions of
reference.
The operational uncertainty
is the intrinsic uncertainty plus the
variation of the quantities of influence (position, supply voltage,
temperature) as defined in standard IEC 61557. The uncertainties are
expressed as a percentage of the reading (R) and as a number of
display counts (ct): ±(a%R+# ct).
3.2. ELECTRICAL CHARACTERISTICS
3.2.1. IMPEDANCE MEASUREMENTS
Particular conditions of reference
Inductance in series with the resistance: zero.
Specified
measurement
range
0.010 to
0.099Ω
0.10 to
0.99Ω
1.0 to
49.9Ω
50 to
149Ω
Resolution (ct) 1 mΩ 10 mΩ 100 mΩ 1 Ω
Intrinsic
uncertainty (
δ
)
± (1.5%R +
0.01Ω)
± (1.5%R + 2
ct)
± (1.5%R +
2 ct)
± (2.5%R +
2 ct)
No-load voltage ≤ 45 mV to 2083 Hz