Page 38 of 110 150821/A4 Operation
The programming of parameter may at first seem a little confusing but remember the highlighted
box is what is selected then pressing the down arrow [⇓] key will toggle through the choices. Use
the right arrow [⇒] key to move the highlighted box and select the next parameter then press the
down arrow [⇓] key to toggle through the choices. Table 2-3 lists the primary and secondary
parameters in common pair configuration that are measurable by the 1730T instrument.
Table 2-3: 1730T Measurement Parameters
Primary Secondary
Capacitance Cs, Cp D ESR
θ
Xs Q
Resistance Rs, Rp Xs Q D ESR
θ
Impedance
⏐Z⏐
θ
Xs Q D ESR
Inductance Ls, Lp Q D ESR
θ
Xs DCR
Inductance L2A, L2B N 1/N M R2
DCR Measurement (DCR, R2)
A 4-terminal or 2-terminal DCR measurement is possible with the 1730T LCR Meter. The 4-
terminal measurement is performed by selecting Ls or Lp as the primary parameter and DCR as
the secondary parameter. A 2-terminal DCR measurement is made using the transformer test
fixture (QuadTech P/N 630166). L2A or L2B is selected as the primary parameter and R2 is
selected as the secondary parameter.
Transformer Turns Ratio Measurement (N, 1/N)
The Transformer Test Fixture (P/N 630166) is used to make turns ratio measurements on a
transformer. Select the primary parameter L2A (2-terminal inductance of coil A) or L2B (2-
terminal inductance of coil B). Select the secondary parameter as R2, N, 1/N or M.
R2: DCR of the main coil "L2B - R2" = DCR of coil B
N: Turns Ratio "L2B - N" = ratio of coil B to coil A
"L2A - N" = ratio of coil A to coil B
N =
Coil B
Coil A
N =
Coil A
Coil B
1/N: Inverse of Turns Ratio "L2B - 1/N" = inverse ratio of coil B to A 1/N =
Coil B
Coil A
1 =
Coil A
Coil B
"L2A - 1/N" = inverse ratio of coil A to B 1/N =
Coil A
Coil B
1 =
Coil B
Coil A
M: Mutual Inductance "L2B - M" = Mutual Inductance coil B
Use L2B as the primary parameter when measuring transformers under normal conditions.
When a transformer has more turns (windings) on one side, connect the side with the most
windings to the B terminals on the outside of the test fixture. Connect the side with the least
amount of turns to the A terminals on the inside of the test fixture.
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