BRUEL & KJAER 2305 - Voltage Level Recording Methods

the Sapphire, see also Fig. 3.6a and b showing the Pens in position. After
replacing any of the two Pens operate as follows:-
1. Ensure ink is flowing by cleaning the cylindrical point with the
cleaning needle using an up-and-down motion, see also Fig. 3.6a and b.
Then remove needle .
Cleaning Needle
(a)
(b)
16/816
Fig. 9.6. Inking pens in position and use 01 the cleaning needle.
(a) Writing Pen.
(b) Event Marker Pen.
2. Lower pen mechanically onto the paper surface.
3. Test ink is flowing by moving paper forwards with Finger Wheel Z.
If not, repeat cleaning process as in 1.
Changing Range Potentiometer.
To change the Range Potentiometer set the switch marked POTENTIO·
METER RANGE to the "Stand by" position. The Range Potentiometer can
now be easily removed by screwing its locking knob counterclockwise (see
Recorder and replace it with the desired type. Always make sure when lower-
ing a Potentiometer into the Recorder and before changing POTENTIO·
METER RANGE from position "Stand by" that:-
RANGE from position "Stand by" that:-
The lamellae face the front of the Recorder.
The stylus rests in a position corresponding to about middle deflection.
The top plate of the Potentiometer lies flush with the Recorder top plate
(i.e. the locking knob is properly tightened).
NOTE: Do not leave the Recorder without a Range Potentiometer inserted
for any period of time without switching it off, as without the Range
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