A 1588
Multi range AC current clamps
7
Make measurement.
(For further information see Instruction manual of measuring instrument.)
Step 5
Disconnect clamps from the conductor(s).Use all safety measures as described in step 3.
Substitute Electric Model For Current Clamps
Equivalent circuit diagram for current clamp measurement:
Im
Is
1 : N
2
I
U
Range selection:
- 500mA
- 5 A
- 50A
GND
U(I)
In
st
ru
m
en
t
Connector
Figure 3: Current clamps A 1588 - block diagram
Symbols on circuit diagrams have following meaning:
Im
Measured (AC) current, primary current
Is
Measured current, current transformer secondary current
N2
Number of secondary turns (N2 = 1000)
U(I)
Output voltage as function of current
U = k * Im.
Factor k depends on
selected current range as shown in table bellow:
Range (A)
k (V/A)
0,5
2
5
0,2
50
0,01
Typical applications
Power Quality Measurement
A 1588 current clamps have linear response through wide frequency bandwidth (see Figure 8).
Therefore they are well suited for:
Power Quality auditing,
EN 50160 or troubleshooting. Particularly for:
Current distortion measurement
Inrush measurement
Functional testing of appliances, machines, etc.
High precision (see Figure 6) and wide measurement range can cover most of practical LV
current measurements.
