Fluke 5320A User Manual

5320A
Users Manual
4-18
6. Press O to start the calibration process.
The Calibrator monitors the input connectors for voltage. When a voltage in the
acceptable range is detected, the Calibrator switches in a resistance to start current
flow. The Calibrator has a settling time (typically 3 seconds) to adjust the resistance
for a current value that matches the nominal current set on the Calibrator. If the
voltage is too low or none existent, the Calibrator displays 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 UUT, the main leakage current
remains in the display.
During passive leakage current calibration, the display indicates the captured leakage
current flowing in the UUT 2 to 3 seconds after the Calibrator senses the correct voltage
on the inputs. Until the correct voltage is detected, the primary display indicates “----”.
The PARAMETERS area of the display shows nominal current entered through the setup
menu and continuous current flowing through the UUT. Both continuous and captured
current values are rms (ac+dc) values.
Calibrating Diffential Leakage Current
For differential leakage current, the Calibrator sinks preset leakage current flowing from
the UUT to the PE terminal, which results in an unbalance between current flowing from
the UUT’s line terminal and the returning current flowing to the UUT’s neutral terminal.
The UUT detects this current difference and displays it as differential leakage current.
The Calibrator works as a variable resistance load with a milliammeter in series. Test
voltage is generated by the UUT. Differential leakage mode differs from the passive
leakage current mode in the connection of the UUT to the Calibrator. The simplified
schematic for differential leakage current is identical to that for passive leakage current
show in Figure 4-10.
Calibrating Active Leakage Current (5320A/VLC only)
The active leakage current calibration mode is for UUTs lacking their own test voltage
source. This function is only available with 5320A/VLC models.
Unlike passive, substitute, and differential leakage current modes for which the
Calibrator acts as a resistance decade, the Calibrator acts as a current source for the UUT
in the active current mode. The current source can have a maximum voltage between 50
and 100 volts. Therefore, as a reminder to the user that voltage will be present at the
output terminals during the calibration, the message shown in Figure 4-12 is displayed
whenever the active leakage current mode is selected.
As figure 4-11 shows, the voltage source, a resistance, and ammeter are connected in
series with the output connectors.

Fluke 5320A Specifications

General

Brand	Fluke
Model	5320A
Category	Test Equipment
Language	English