5.2.2. Calibration
48
To
calibrate the
X-Y
Recorder using the signals from the Analyzer, proceed as follows:
1.
Connect a mains supply to the
X-
Y Recorder and mount a pen on the pen holder as
described
in
the Instruction Manual
for
the instrument.
2.
Switch on the Analyzer and allow the self-test routine
to
run (See Chapter 3
for
details
of
powering, etc.).
3.
Place a sheet
of
preprinted Recording Paper (either
QP
3571
or
QP
3572) on the
platen
of
the Recorder and align the paper with the left and
bottom
edges
of
the
platen.
4.
Set the FUNCTION SELECTOR switch on the
X-Y
Recorder
to
"Paper Hold" and
smooth the paper down.
5.
Set the other controls on the
X-
Y Recorder as follows:
SWEEP
RATE:
SWEEP:
Y-RANGE:
Y-SWEEP:
Y-POLARITY:
Y-GAIN:-
X-RANGE:
X-SWEEP:
X-POLARITY:
X-GAIN:
"20
mm/s"
"Hold"
"50
mV/mm"
"Ext."
"Norm."
"Cal."
click-stop
position
"20
mV/mm"
"Ext."
"Norm."
"Cal."
click-stop
position
6.
If necessary, select the desired measurement units by activating the "120
h/Units"
push key on the Analyzer.
Note: The full-scale signals
for
the Metric and Imperial systems
of
units are
different.
7.
Change the FUNCTION SELECTOR switch
to
"Servo On" and press the
"Replay/Plot" pushkey on the Analyzer twice. The pen carriage
of
the
X-Y
Recorder
will move. The position
of
the carriage and pen should then be adjusted using the
Y-ZERO SET and X-ZERO SET knobs on the
X-Y
Recorder, until the pen is posi-
tioned above the zero circle on the Recorder Paper.
To
ensure that the pen is in the
correct
position
it
can be lightly pushed down to make a mark on the paper. Con-
tinue adjustment until this mark coincides with the
dot
at
the centre
of
the "Zero"
circle.
8.
Press the "Replay
/Plot"
push key on the Analyzer. The pen carriage
of
the
X-
Y Re-
corder
will move. The position
of
the carriage and pen should then be adjusted by
reducing the gain, using the
Y-GAIN and X-GAIN knobs on the
X-Y
Recorder, until
the pen is positioned over the
"Gain Cal." circle on the Recorder Paper.
To
ensure
that the pen is in the
correct
position
it
can be lightly pushed down
to
make a mark
on the paper. Continue adjustment until this mark coincides with the
dot
at the
centre
of
the "Gain Cal." circle.
The
2308 is now calibrated and ready
for
the replaying
of
data stored in the memory
of
the Analyzer.
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