VOLTECH AT3600 USER MANUAL TRANSFORMER TESTS
TESTS AND TEST CONDITIONS VPN 98 - 024 PAGE 7.1.25.
Intermediate Inductance
(L
m
)
Preferred test signal
Frequency Voltage (V
m
)
100nH
1uH
10uH
100uH
1mH
10mH
100mH
1H
10H
100H
1KH
→
→
→
→
→
→
→
→
→
→
→
1uH
10uH
100uH
1mH
10mH
100mH
1H
10H
100H
1KH
10KH
300KHz
100KHz
30KHz
10KHz
1KHz
100Hz
100Hz
50Hz
50Hz
50Hz
20Hz
10mV
30mV
50mV
100mV
100mV
100mV
300mV
1V
5V
5V
5V
The Test Conditions for Turns Ratio by Inductance Measurement
SPECIFYING THE TEST LIMITS
When specifying turns ratio tests, it is preferable to avoid limits which are
unnecessarily tight, and which may therefore lead to measurement difficulties.
For example, if two equal secondary windings should have 10 turns each, the ratio
should be 1:1. One turn in error would produce a ratio error of 10% or -10% (i.e.
11:10 or 10:11), and therefore limits of +5% and -5% would be suitable to detect the
error.
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