Instruction manual BD 11/11E / 12/12E
Kipp & Zonen B.V.
19
When the range switch is turned fully clockwise, the span is 1 mV full scale. The whole range in between
these spans is covered in 14 steps according to the sequence 1, 2, 5, and 10. The input spans have
these calibrated values only when the "cal/var" switch is in the "cal" position.
4.2.2.2 Calibrated / Variable span
When this switch is in the "cal" position an input signal equal to the selected range will result in a full-
scale deflection. It may, however, sometimes be desirable to have an input span, which lies in between
the values that can be chosen with the range switch. In such a case, the "cal / var" switch must be put in
the "var" position, after which the variable span can be set by turning a potentiometer (indicated with
"var") with the aid of a small screwdriver.
Example: Suppose a signal varying between 0 and 25 mV has to be recorded and one wants to use the
full-scale width.
1. Select the 50 mV range.
2. Put the “cal / var” switch in the “var” position.
3. And adjust the potentiometer until the amplitude reaches 100 % of
scale.
Since the variable span allows for 40 % to 100 % span adjustment, any desired (non-calibrated) span
between 0.4 mV and 20 V can be obtained.
4.2.2.3 Zero and zero adjust
When the "Zero" switch is in the down position, the pen will remain at its zero location. This is the
location of the pen in the absence of an input voltage. The location of this point can be shifted to the left
or to the right by turning the small knob zero "adjust". This function allows relocation of the zero point
anywhere between the left and right edge of the paper. After the zero location has been chosen, the
recorder must be put back into operation again by pressing the "zero" once again, which brings the switch
back in the upward position.
If desired, the signal axis together with the location of its zero point can be mirrored with respect to the
centre of the recorder. Please refer to section 3.2.5 polarity selection for more information.
4.2.2.4 Mechanical pen up / down (BD 11/12)
Both pens are lifted with the metal lever, which is located on the right-hand side in the top cover. This
lever is being used for controlling vertical movement of both pens.
Make sure that when no chart movement takes place, the pens are lifted.
Also when power is switched off the pen have to be lifted, to avoid leaking of the pen and stains on the
paper.
4.2.2.5 Electrical pen up / down (BD11E/12E)
When the optional electrical pen-lift is built in the pens can be lifted independent.
If the pen remains too long at the same position, ink-stains will form on the paper. To avoid this, the
recorder automatically lifts the pen when there has been no paper movement for more than 30 seconds.
This time interval is equal to the time between two chart speed pulses when the recorder is operating at
the lowest possible speed (i.e. 0,1 mm per minute). This time-out is being accomplished by checking
both the internal and external chart speed pulses. This includes checking the operation of the arrow keys
on the operator panel.
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