Setup for testing low mass tapes!
The low mass tapes are tested for:
-
strip resistance (detection of line breaks; nominal resistivity ~0.1 Ohm/m (wide lines), ~1 Ohm/m (narrow lines) )
-
interstip resistance (detection of short-cuts between the strips; nominal resistivity > 1 G Ohm/m)
-
leakage current from the high voltage line-detector
bias line; expected leak of up to 100 nA @ 500 V
The schematic view of the setup (EPS)
:
The measurement procedure:
-
The cable in inserted in the measurement jig .
-
The strip resistance is measured first for each line.
-
The common contact is disconnected and U=5 V is applied to every second
line on the tape (red lines)!
-
The interstrip resistivity is measured by the voltage drop on shunt resistor
(10kOhm) on lines
not connected to U=5 V.
-
High voltage is connected to the HV line and current on the neighboring
strip is measured (leak).
-
Same procedure is repeated again for the second layer of the tape (except the leakage current test)
The system is controlled by a custom written LabView software (screen-shot), which performs
automatic measurements and
stores them directly to both the low mass tape database and file. Before the test is performed
a sticker with the tape bar-code is glued to the low mass tape.
