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Detecting Micro Insulation Failure (BDD Function)
5.2 Detecting Micro Insulation Failure
(BDD Function)
The Break Down Detect (BDD) function detects micro voltage or current change during a test. As
it detects a change to the voltage or current, dropped detection due to insufficient sampling speed
can be reduced.
Using the BDD function allows you to detect micro insulation failure due to contamination (mixing of
metal foreign substances), etc.
The number of times the amount of change in voltage or current exceeded the set threshold
value as well as the amount of change in the voltage and current each time are recorded in the
instrument’s memory (up to 99 sets of data).
The detection results can be checked on the Measurement screen, communications command, and
EXT. I/O.
Measurement
screen
You can check the BDD count on the Measurement screen.
Communications
command
You can check the BDD count with the
:BDD:COUNt?
query
You can check the time stamp at which BDDs were detected with the
:BDD:MEMory?
query (p. 150), along with the detection timing (CCV, CVV, CVI), amount of voltage
change, and amount of current change.
EXT. I/O
You can use No. 13 (BDD) pin to check if the BDD count was more than or equal to 1.
The following detection methods are available for the BDD function. It is recommended to use
settings of 1 V and 1% or more as measurement can be affected by the external environment.
CC V mode
Detects insulation failure using the voltage value (V) during charging.
A judgment is made for the voltage value immediately before it changes.
Settable range: 0.1 V to 500.0 V
CV V mode
Detects insulation failure using the voltage value (V) in the steady state after charging.
A judgment is made for the voltage (stabilized voltage) in the steady state.
Settable range: 0.1 V to 500.0 V
CV I mode
Detects insulation failure using a change to the current (%) in the steady state after
charging.
A proprietary reference value has been established for each range. The judgment
threshold value is set as a percentage of that reference value. Evaluate a known-good
part in the operating environment and set the threshold at which no BDD count occurs.
Settable range: 0.6% to 999.9%
IMPORTANT
The BDD function’s detection precision decreases when switching ranges during auto-range
operation. It is recommended to set the range manually.
HIOKI BT5525A961-00
Содержание BT5525
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