5322A
Operators Manual
52
To start a Passive Leakage Current calibration:
1. Push .
2. If Passive Leakage Current is not already displayed, push the Mode
softkey.
3. Using the cursor keys or rotary knob, highlight the Passive selection and
either push the Select softkey or push in the rotary knob.
4. Referring to the terminals part of the display, connect the DUT to the Product.
5. Push the START button on the DUT.
6. Push to start the calibration process.
The Product monitors the input connectors for voltage. When a voltage in the
acceptable range is detected, the Product switches in a resistance to start
current flow. The Product has a settling time (typically 3 seconds) to adjust
the resistance for a current value that matches the nominal current set on the
Product. If the voltage is too low or none existent, the Product shows an error
message.
The Test voltage too low message is also displayed when the LC fuse is
open.
Note
The captured main leakage current simplifies calibration of testers
that measure leakage current for a limited time of just several
seconds. Even after the test current is removed from DUT, the main
leakage current remains in the display.
During passive leakage current calibration, the display indicates the captured
leakage current flowing in the DUT 2 seconds to 3 seconds after the Product
senses the correct voltage on the inputs. Until the correct voltage is detected, the
display indicates ----. The PARAMETERS area of the display shows nominal
current entered through the setup menu, continuous current flowing through the
DUT and touch voltage in volts. Both continuous and captured current values are
rms (ac+dc) values.
Differential Leakage Current
For differential leakage current, the Product sinks a preset leakage current that
flows from the DUT to the PE terminal, which results in an unbalance between
current flowing from the DUT’s line terminal and the returning current flowing to
the DUT’s neutral terminal. The DUT detects this current difference and displays
it as differential leakage current.
The Product works as a variable resistance load with a milliammeter in series.
Test voltage is generated by the DUT. Differential leakage mode differs from the
passive leakage current mode in the connection of the DUT to the Product. The
simplified schematic for differential leakage current is identical to that for passive
leakage current show in Figure 8.
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