Voltech AT360, User Manual

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V
OLTECH
AT
I
U
SER
M
ANUAL
P
AGE
7-89
7.1.21 RESP – F
REQUENCY
R
ESPONSE
Measurement
Range
Test
Voltage
Test
Frequency
Basic
Accuracy
-100dB to +100dB 1mV to 5V 20Hz to 3MHz 1.0dB
Where Used
The frequency response test, RESP, may be used to check that the variation
in power loss of a telecommunications or audio transformer over a specified
frequency range is less than specified limits.
Measurement Conditions
The RESP test consists of a number of Insertion Loss (ILOS) tests repeated at
different frequencies.
The resistors shown are fitted to the test fixture and should be switched out of
circuit when making other measurements such as resistance and inductance.
This can be done by fitting relays to the fixture and switching them at
appropriate points in the test program using OUT tests.
The first ILOS test is made at a reference frequency that is usually near the
middle of the band of frequencies of interest. The result of this test is the 0dB
reference level. Further ILOS tests are then carried out at user-selected
frequencies and the results referred to the reference dB level.