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STB6684/A Operation Manual
a very small value. 1 to 3 seconds later the absorption current is measured. It is clear that care
has to be taken when planning the timing of the sequence.
The figure below shows a typical sequence when measuring the leakage current (or IR) of a
foil capacitor with dielectric absorption.
Ic
Uht and Ic
0
Output from Current Amp
LIM0
0
ILIM (Iout > 2mA)
0
Charge Relay
0
Const. Curr. Charge
Change Time
The charge relay is activated during the preset charge time, which is longer than it takes for
the current to fall below 2mA. When the charge time expires, the charge relay is deactivated.
Immediately after this the measured current is very low (and hence the calcutlated resistance
very high), but in the period after the absorption current begins to flow through the capacitor.
To avoid premature approval of a component measurement should be started until typ. 1-3sec.
after the charge relay has been deactivated.
4.5.2 ITEM
Seven sequence commands are available:
◆ CHARGE
◆ WAIT
◆ MEASURE
◆ MEAS. CONT.
◆ MEAS. TO GO
Uht
Measure continuously
Wait
◇ 43
Chapter 4 [SETUP]
MEAS TO GO
Discharge
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