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PTE-50-CET
Sheet 35
remains the same when the output is ON. If the value selected is higher than allowed in the range
chosen, the rotating knobs continues turning, but the value cannot be increased.
The unit
does not feedback values less than 3 % of the end of the selected range
. In this case
the phase and the magnitude values cannot be guaranteed. The following table clarifies this:
Selected range
3% of range not feedback
Feedback
0.33 A
0 - 0.01 A
0.01 - 0.33 A
8 A
0 - 0.24 A
0.24 - 8 A
25 A
0 - 0.75 A
0.75 - 25A
50 A
0 - 1.5 A
1.5 - 50 A
150 V
0 - 4.5 V
4.5 - 150 V
6.25 V
0 - 0.187 V
0.187 - 6.25 V
In this case, if you increase the level with the output ON, overload alarms may be produced, due to
transitories, disconnecting the corresponding channel.
4.2.6. OUTPUT CONTROL: ON/OFF AND ALARMS
The power output status is controlled by the ON/OFF key, and is active when the corresponding LED
is lit. To turn off this output simply press the key again.
This output is protected by 2 types of electronic protection, which are indicated by the corresponding
LEDs marked, OVERLOAD (OVL) and/or THERMAL (TH).
When either of these are active (lit), the power output is immediately turned off and the LED ON/OFF
will turn off.
When the overload alarm is lit, it is due to an overload of the maximum power values allowed in the
output. In some cases it may be due to fast transitories that the unit cannot feedback properly, such
as a sudden step from a very low output value to another one very high. To start again, simply press
the output key ON to activate the output. If the cause of this overload has been rectified the unit will
function as normal, if the overload remains the unit will turn off again.
When the thermal alarm is lit, it is because the internal temperature has reached the allowable limit.
When this occurs, you must turn off the unit. When this alarm LED is lit, the unit cannot be used, and
there will be no output. When the unit has cooled down to a lower temperature the LED will go off and
the unit can be used.
4.2.7. DYNAMIC TESTS: STEP TO 2
ND
VALUE
The PTE-50-CET allows the operator to make dynamic tests, by allowing jumps (steps) from one
value to another, whether it is from higher to lower or vice versa. This is very useful, for example,
when performing dynamic characteristic tests. This is achieved as follows:
1. Press the key
. In the display will appear the reading “0000” or the 2
nd
value previously
recorded. Select with the rotating knob the desired value to acts as 2
nd
value.
2. Press again the key
. The display will show the actual value that is the 1
st
value. Turn
on the output if this is off.