Part
12470
Rev. 2 3/25/99
7
Model CB-832 is rated at 1.75 kVA output and is equipped with three output terminals, each capable
of supplying its rated current. The current rating of these output terminals may be exceeded for
short durations provided the voltage rating is sufficient to "push" the desired current through the
device under test and the connecting test leads. The overload capacity, represented by multiples of
rated current, versus TIME ON and TIME OFF are given below.
%Rated
Maximum
Minimum
Current
Time ON
Time OFF
100 (1x)
30 minutes
30 minutes
200 (2x)
3 minutes
8 minutes
300 (3x)
30 seconds
4 minutes
400 (4x)
7 seconds
2 minutes
Model CB-832 also can be used continuously for any reasonable length of time at 70.7% of the
current rating of the output terminal.
EXAMPLE:
Consider the terminal rated at 500 amperes:
a.
500 amperes may be drawn at any voltage from 0-3.5 volts for 15 minutes provided
the test set is subsequently de-energized for 30 minutes.
b.
353.5 amperes (70.7% of 500 amperes) may be continuously drawn at any voltage
from 0-3.5 volts for any reasonable length of time.
c.
The following overload currents may be drawn at any voltage from zero to maximum
volts for the Time ON indicated, followed by the indicated Time OFF. The
maximum output voltage available when the current rating of the output terminal is
exceeded (overloaded) will be less than the rated value due to the regulation of the
transformer in the test set. For example, when drawing 750 amperes from the 500
ampere terminal, the maximum voltage available is approximately 2.9 volts.
500 Ampere
Time ON
Time OFF
750 amperes
6 minutes
13 minutes
1000 amperes
3 minutes
8 minutes
It should be noted that because of the impedance of the device under test and the connecting test
leads, the maximum practical test current available from the terminal rated 500 amperes is
