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2.
GENERAL INFORMATION
2.1
INTRODUCTION
The flatbed recorder is available in four different versions, with one or two channels and with or without
electrical penlift and remote control.
BD 11
single channel flatbed recorder
BD 12
dual channel flatbed recorder
BD 11E
single channel recorder with electrical penlift and remote control
BD 12E
dual channel recorder with electrical penlift and remote control
The BD 11/11E / 12/12E recorder is a compact recorder meeting today's technology. The recorder uses
a null balancing potentiometric system. The two-channel recorder offers two completely independent and
isolated servo systems. Both pens use the full-scale width (200 mm). Disposable fibre pens are used,
avoiding the inconvenience of a bleeding ink system. Many combinations of measuring ranges and
additional options are possible (see appendix C - E).
2.2
PRINCIPLE OF OPERATION
The recorder transports the chart paper at a constant velocity, which may be as slow as 0.1 mm per
minute or as fast as 20 mm per second. The positions of two independent pens represent the levels of
the two corresponding inputs of which the time functions are drawn. The full scale input sensitivity range
from 1 mV to 20 VDC. The recorder is equipped with one chart drive control panel and with two
independent servo system control panels, one for each channel.
A number of functions can be controlled by means of the operator panel, as well as by external signals.
They comprehend chart drive control and for both channels pen up and down and servo markers. A
complete description of these functions and the interface can be found in chapter 4.
Due to the nature of the two-channel recorder, the pen of channel 1 is always 2.5 mm behind the pen of
channel 2.
2.2.1 Pen offset compensation module
In order to be able to compensate for the effect of the physical distance between pen of channel 1 and
channel 2, the user can install a pen offset compensation module BD 1512, which is available from Kipp
& Zonen under part number 1317-830. The pen offset compensation module allows a graphical
representation of two input signals on the BD 12/12E recorder without any trace offset. Normally when a
multi-pen recorder is used for monitoring signal variations, the traces are shifted in the direction of paper
transport with respect to each other, because the pens cannot write at the same time at the same spot.
This effect has been eliminated now. The signal of the second pen is not immediately written on the
chart, but is stored until the chart is advanced by 2.5 mm, which is the distance between the pens,
measured in the paper feed direction. For more information please refer to section 5.2.1 Pen offset
compensation.
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
Instruction manual BD 11/11E / 12/12E
Kipp & Zonen B.V.
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