ISA T2000 - Timer; Outputs Measurement; Current and Voltage

DOC. SIE10110 Rev. 6 Page 11 of33
3.4 TIMER
The electronic digital timer has a fully automatic stop, both for make and break of the input, that
can be either a clean contact or a contact under voltage. All selections are menu-driven via the
multi-function knob.
- Characteristics of Stop input:
.. Input connection: two banana sockets;
.. Input may be selected as Normal Open or Normal Close. It is possible to select timer stop on
input level transition;
.. Type of input: either dry or under voltage; selection via the multi-function knob. Maximum input:
250V AC or 275 V DC;
.. With dry input selection, the wetting voltage is 24 V; the test current is 3 mA nominal;
.. With voltage input selection, two thresholds can be selected: 24 V or 80 V;
.. Selections are displayed on the front panel by 5 dedicated lights;
.. When the input is closed or with voltage an LED turns on;
.. When the relay intervenes the TRIP light turns on;
.. Wrong selection protection. If voltage is applied when clean input is selected, input circuits are
not damaged;
.. Timer start: as the fault is generated.
- Available measurement: elapsed time between test start and STOP input.
- Time can be metered as seconds or cycles. Metering range, in seconds: see table.
Range
Resolution
Accuracy
From 0 to 9.999 s
1 ms
± (1 ms + 0.005%)
From 10.00 to 99.99 s
10 ms
± (10 ms + 0.005%)
From 100.0 to 999.9 s
100 ms
± (100 ms + 0.005%)
From 1000 to 9999 s
1 s
± (1 s + 0.005%)
. Metering range, in cycles, selectable at 50 Hz or at 60 Hz.
Range
Resolution
Accuracy
From 0 to 1,000
(Equal to 19.998 s @ 50 Hz;
16.665 s @ 60 Hz)
0.1 cycles
± (0.1 cycles + 0.005%)
From 1000 to 499,998.5 cycles @ 50 Hz;
From 1000 to 599,998 cycles @ 60 Hz
(Equal to 9999 s)
1 cycle
± (1 cycle + 0.005%)
- Display reset: automatic, at test start.
3.5 OUTPUTS MEASUREMENT
3.5.1 Current and voltage
- The displayed measurements follow the test selection.
- Type of measurement: true rms for AC outputs; average for DC outputs.
- Readings, resolution and accuracy: see table. Note that the available ranges can be greater than the
maximum value of the output to which the load is connected: this means that higher values can be
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