Tettex MIDAS 2881, Operating Instructions Manual

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50 Software
Text “Stray DF (tan

)”
The Dissipation Factor of the measured stray capacitance
will be displayed in this field.
Check box “Stray Error Correction ”
By activating this box the capacitance and dissipation
factor of the cable stray capacitors will be considered for
further measurements. This mode will be used only for
grounded test objects measurement such as GST A+B,
GST gA, GST gB, GST gA+B.
Parallel Capacitance Detection
Check box “Parallel Capacitance Detection”
Under some circumstances and test objects, it can happen,
that a capacitance parallel to the inputs turns the phase,
which results in an erroneous tg
δ (PF) value. A possible test
object is a transformer measuring the Capacitance C
HL
(HV
- LV Side). The capacitance C
HG
(HV – Gnd Side) will turns
the phase, if the test current is small.
If this field is checked, this case will be detected and
automatically switched to a lower input range. If it is not
checked the range with the best voltage accuracy will be
chosen.
Resonating Inductor
For operating with an external resonating inductor like 5288a or 5289 this button has to be selected. A
resonating inductor is used to increase the range of the capacitive load by parallel resonance.
This button has to be deactivated if the resonating inductor is not used. Otherwise the overcurrent
protection for the highvoltage transformer is deactivated.
Check box “Resonating Inductor”
See Chapter "Accessories and Options : Resonating
Inductor" for operating with an resonating inductor.
7.4.4 Menu Options
In this menu you can set some general options