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Fluke A40B Series Precision DC and AC Current Shunts

Features

Precision, low inductance shunts for dc and ac current metrology

The A40B dc and ac precision current shunt set consists of 14 low-inductance coaxial current shunts, adapters and connectors, and a rugged transit/storage case. Designed for currents from 1 mA to 100A, the current shunts are for laboratory use in making directly measured absolute ac or dc current measurements as well as ac/dc current transfer measurements. They exhibit outstanding resistance value stability, with an excellent self-heating power coefficient, and a low temperature coefficient. With all of these characteristics combined, the shunts offer direct measurement of current from dc to 100 kHz with higher accuracy than previous commercially available shunt technology. Now precision measurements can be made in a single step process rather than by more complex traditional ac/dc transfer methods.

 

Specs

Absolute accuracy

The following table shows the 1-year absolute accuracy specification stated at k=2, approximately 95 % confidence for the calibrated value. The specifications include 1-year stability, temperature effects over TCal ± 1 °C, and the measurement uncertainty of the calibrated value.
Shunt Nominal Current: Specification ± μA/A, TCal ±1 °C, ≤ 50 % RH 1,2,3,5
  DC 1 kHz 100 kHz
1 mA 20 55 150
10 mA 20 26 26
20 mA 20 26 26
50 mA 20 23 23
100 mA 20 24 24
200 mA 20 26 26
500 mA 21 27 28
1 A 21 27 31
2 A 21 27 48
5 A 21 31 71
10 A 26 37 92
20 A 26 43 113
50 A 32 55 144
100 A 35 65 174

1 The measured current is determined from: I = (V/Rcalibrated) ×(1 + (AC-DCcalibrated /1,000,000)); where AC-DC calibrated is expressed in ppm.
2 Above 1 kHz interpolate the specification (si) between frequencies fupperand flower using:
si = slower + (fi – flower) × (supper – slower) ÷ (fupper – flower)
3 Add 20 μA/A if relative humidity is outside specification limits.
4 1 mA specifications apply with the battery charger disconnected.
5 Specifications assume no loading effects due to the voltage-sensing device. See Output Voltage Measurement – Loading Effects in the operating information.

 

Maximum AC-DC Difference
Shunt Nominal Current: Maximum AC-DC Difference (± ppm)1,2
  1 kHz 100 kHz
1 mA3 53 150
10 mA 20 40
20 mA 18 30
50 mA 13 16
100 mA 14 27
200 mA 17 28
500 mA 17 21
1 A 17 23
2 A 17 44
5 A 23 69
10 A 28 98
20 A 37 150
50 A 47 180
100 A 60 300

1 Specifications indicate the maximum flatness deviation from dc, and include both measured AC-DC difference and the uncertainty of measurement. They are stated at k=2, approximately 95 % confidence.
2 Includes 1-year stability of the AC-DC difference.
3 Specifications for the 1 mA current shunt are for TCal ± 1 °C.

 

General Specifications
Calibration Documentation 17025 accredited report of calibration included
Dimensions (maximum)
Shunt Value:  1 mA to 2 A
Height:  70 mm (2.75 in)
Width:  70 mm (2.75 in)
Overall Length1:  
124 mm (4.9 in)
Shunt Value:  5 A to 20 A
Height:  130 mm (5 in)
Width:  130 mm (5 in)
Overall Length1:  
210 mm (8.25 in))
Shunt Value:  50 A and 100 A
Height:  200 mm (7.9 in)
Width:  200 mm (7.9 in)
Overall Length1:  343 mm (13.5 in))

1 Includes input and output connectors; subject to change by component vendor.
Physical/mechanical parameters
Shunt Value:  1 mA to 20 A
Weight:  0.7 kg (1.6 lb)
Input Connector:  Type-N (female)
Output Connector:  Type-N (female)
Shunt Value:  50 A and 100 A
Weight:  3.4 kg (7.5 lb)
Input Connector:  Type-LC (female)
Output Connector:  Type-N (female)
Operating environment
Temperature: 13 °C to 33 °C
Calibration temperature (TCal) range: 18 °C to 28 °C
Humidity range for best specification 1,2: ≤ 50 % RH
Altitude: 0 m to 3,000 m

1 Resistance stability is affected by humidity, but changes are reversible.
2 If the shunts are calibrated outside this RH, stability specifications will be met as long as the shunts are stored and used at the same relative humidity ± 10 % RH.
Storage and transit environments (for models other than the 1 mA current shunt)
Temperature to avoid damage: -20 °C to 140 °C
Temperature and humidity to maintain performance1: 5 °C to 45 °C; 15 % to 80 % RH
Non-operating altitude: 0 m to 12,000 m

1 Storage at extremes of temperature or humidity will cause a temporary change of shunt resistance by up to ± 20 ppm. When subsequently stored or used within the limits of the operating environment, the shunts will recover to their original resistance value within 30 days.

 

Additional 1 mA current shunt specifications
Output resistance 8 mΩ
Maximum safe output current 11 mA (e.g., 1 V output into 90 Ω)
Maximum capacitive load 800 pF
Output voltage regulation 15 ppm/100 pF
Maximum output dc v offset ± 100 μV (typical ± 25 μV)
Typical error @ 1 MHz < 2 %

 

Battery specifications
Battery size AAA (44.5 mm x 10.5 mm)
Battery technology Nickel-Metal Hydride (NiMH)
Number of batteries required 8 (in 2 groups of 4)
Nominal battery voltage 1.2 V (4.8 V per group of 4)
Typical battery capacity 800 mAh
Storage and transit environment to preserve the batteries
Less than 90 days:  -20 °C to 40 °C
Less than one year:  -20 °C to 30 °C
Charging time (from fully discharged):  100 minutes
Maximum operating time between charges
Maximum output load (11 mA):  18 hours
High impedance load:  24 hours
Recommended cooling period:  100 minutes

To prevent loss of battery capacity recharge at least twice per year.

Models

 

 

 

 

 

 

 

 

 

 

 

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