WIKA CEP1000 - Manual (Page 19)

19 WIKA operating instructions, model CEP1000
11570351.02 10/2010 GB/D/F/E/I
GB
6. Commissioning, operation
6.3 Advanced operating modes
6.3.1 Automatic step function/automatic ramp mode
The CEP1000 is capable of increasing the output current in the mA range in steps of
25 % automatically with intervals of 5 seconds. The output current in the mA range
can be increased linearly in form of the ramp function from 4 mA up to 20 mA and then
reduced again automatically to 4 mA.
To activate the automatic step/ramp function proceed as follows:
1) The automatic step/ramp function can be used for the application as milliampere
source as well as for the milliampere simulation. Switch the instrument into the corre-
sponding operating mode.
2) Connect the CEP1000 to the instrument to be tested.
3) For the automatic step function press the "AUTO" key once, for a slow ramp function
twice and for the quick ramp function three times. After every key stroke a small
confirmation window appears in the lower left corner of the LCD display, it indicates
which step function or ramp function has been selected.
4) As soon as the step function/ramp function has been activated, it is functioning
constantly until another key is pressed.
6.3.2 Fault percentage function
This unique function calculates the fault percentage of the measuring range (a measur-
ing range of 4 ... 20 mA gives a span of 16 mA). Using the function for calculation of fault
percentage the user can "Zero Out" the milliampere indication, thus, enabling indication
of deviation from the ideal value on the display as a fault percentage.
Procedure:
1) Connect the CEP1000 to the instrument to be tested.
2) Set a mode with milliampere output for the instrument (source or simulation).
3) Set the required output value.
4) If the instrument to be tested does not measure the exact value, press and hold
the "%ERROR" key and adjust the knob so that the instrument displays the correct
value. Press and keep holding the “%ERROR” key further on.
5) The indication in the percentage field corresponds to the fault or deviation as a
percentage of the span.
6) After the "%ERROR" key has been released, the indication switches back to normal
operation.