Voltech AT3600 - Page 304

TRANSFORMER TESTS VOLTECH AT3600 USER MANUAL
PAGE 7.1.24. VPN 98 - 024 TESTS AND TEST CONDITIONS
USING THE MEASURE BUTTON TO SET TEST PARAMETERS
To do this you must be programming the test from a computer that is connected to the
tester’s auxiliary port. Select the integration period you require, enter the primary
and secondary terminals, then click on the measure button. The editor will then enter
the test signal and show the measured turns ratio. Set percentage limits on this ratio
and click ‘OK’ (you may select a polarity test before clicking ‘OK’).
USING THE AUTO BUTTON TO SET SECONDARY VOLTAGE
To do this you must know the primary inductance.
Select the test voltage and frequency for the primary from the table below and enter
them in the TRL dialogue box. Enter the turns ratio, then press the ‘Auto’ button
next to the secondary voltage parameter, the tester will automatically select the
appropriate test voltage for the secondary winding when the program is running.
SETTING THE PRIMARY AND SECONDARY PARAMETERS MANUALLY
To do this you will need to know the inductance of the primary and secondary
windings.
The optimum test conditions are chosen for an inductance value that is between the
primary and secondary (L
m
).
If you calculate V
s
or V
p
to be greater than 5V, you should set 5V as your test signal.
If you calculate V
s
or V
p
to be less than 1mV, you should set 1mV as your test signal.
spm LLL ×=
Where:
L
m
= Intermediate inductance
L
p
= Primary inductance
L
s
= Secondary inductance
V
p
= Primary voltage
V
s
= Secondary voltage
V
m
= Intermediate voltage
N
p
= Primary turns
N
s
= Secondary turns
s
p
mp
N
N
VV =
p
s
ms
N
N
VV =
Look up the recommended test signal for this
inductance.
Enter the recommended frequency for this
inductance as the test frequency.
The primary and secondary voltages can be
calculated from the following: