16
Product Overview and Features
Features
Test duration
50 ms (fastest)
Judgment results can be displayed in 50 ms at the fastest.
Selectable test voltage
The test voltage can be selected from 25 V to 1000 V in
increments of a resolution of 1 V. The comparator function
(p. 44) and test duration function (p. 39) support a wide
variety of insulation resistance testing according to safety
standards.
Easy-to-read display
High denition LCD display for a high level of visibility
Saved setting
conditions
Up to ten patterns of test conditions can be saved. When the
power is turned on again after it is turned off, the settings
before the power is turned off are replicated. (p. 76)
External interface
EXT.I/O outputs a signal according to the ST5520/ST5520-
01 status. The start/stop signal input and test conditions can
be selected. Extended insulation resistance uctuation can
be recorded when analog output is used. (p. 81)
Equipped with
RS-232C interface
A personal computer (PC) can be connected for automated
testing and recording test results. (p. 119)
Switched probe
The optional 9299 Switched Probe enables efcient manual
testing.
Automatic
discharge function
Any charge remaining in pieces of equipment to be
measured is released inside the instrument after tests. As
the TEST lamp blinks during discharge, the discharge status
can be checked.
Equipment can be protected from possible damage during
successive insulation resistance testing.
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