TH2827 Series Operation Manual Chapter 5 Execute LCR Operation and Some Examples
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When the measurement parameter is L2A-N, N is the turn ratio of primary to
secondary;
When the measurement parameter is L2B-N, N is the turn ratio of secondary
to primary.
NOTE: TH2827A is suitable for the measurement of turn ratio when
N≥1. If N<1, it may results in measurement error due to large amplitude
of the sampled signal. Therefore, please select L2A or L2B reasonably
before measurement.
In general, if the turn of winding A is larger than winding B, select L2A-N,
otherwise select L2B-N.
HINT: After setting N-REF (＞1) in limit table, N or 1/N appears to be the turns
of transformer primary or secondary polarity directly. Refer to the setup of N-REF
in chapter 4.
5.6.3 Mutual inductance M
Mutual inductance adopts direct measurement method. After connecting the
transformer according to figure 5-17, mutual inductance can be measured when
the secondary parameter selects M.
Hcur
M
Hpot
A B
Lpot
Lcur
Figure 5-19 Direct measurement method of mutual inductance
Similar to the measurement of turn ratio, if the turn of winding A is larger
than winding B, select L2A-M, otherwise select L2B-M.
5.6.4 Direct current resistance measurement R2, DCR
Select L2A-R2 to measure the primary inductance and primary direct current
resistance;
In LCR manner, select Ls-DCR to measure the inductance and direct current
resistance for some winding of transformer with four-terminal manner.
Whether it is L2A-R2, L2B-R2 or Ls-DCR, measurements are alternated
between AC/DC. As for the measurement of high resistance, especially large
inductance components, it may lead to unsteady measurement or test error due
to long stable period of signal.
TH2827A supports DCR independent measurement. With constant direct
current signal to measure DCR in order to expand the application scope of DCR
measurement.
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