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INSERTION LOSS
Specifications subject to change without notice.
15801 Chemical Lane, Huntington Beach, CA 92649-1595
Tel: (714) 898-0960 Fax: (714) 896-0971
Rhombus
Industries Inc.
FR-IL 6/98
24
INSERTION LOSS
Insertion Loss (IL):
The insertion loss of the transformer is a measurement of the signal loss due to the insertion of the transformer in the
circuit. Primarily due to the copper loss of the wire, it can also include losses due to the magnetic material. The test circuit
below is used by Rhombus Industries to measure insertion loss. Unless otherwise stated in a data sheet, test signal level is
0 Dbm.
v
L
v
P
V
P
= Primary Voltage
V
L
= Load Voltage
Z
1
= Primary Impedance
Z
2
= Load Impedance
V
L
Z
1
V
P
Z
2
20log
Insertion Loss Formula
FREQUENCY RESPONSE
Frequency Response (FR):
Rhombus Industries measures Frequency Response as a variation in Insertion loss over a specified range of frequen-
cies. The test circuit below is used by Rhombus Industries to measure Frequency Response. A meter calibrated in Db can
be used, However, care must be taken that the frequency range tested is within the capabilities of the meter. The source
voltage must be held constant regardless of voltage measurement technique. Unless otherwise stated in a data sheet, the
reference frequency for all audio transformers is 1 KHz and the test signal level is 0 Dbm.
V
Ltest
20log
Frequency Response Formula
V
Lref
V* = V
REF
& V
TEST
V
REF
= Voltage at reference frequency
V
TEST
= Voltage at frequency under test
V
G
= Source Voltage (Must be held constant)
v
*
v
G