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Chapter 6 Calibration
Page 6-2
6.3 Scale Calibration
The Recorder menu supports full calibration for the voltage and current input ranges of the instrument. Each range
requires a unique calibration constant, which is automatically calculated during the calibration of each range.
6.3.1 Calibration Scales
Follow the procedures below to Calibrate Scales.
6.3.1.1 Connecting Voltage Source
Connect the precision voltage source to any available direct input at the rear upper (lower) analog
Input terminals (See Figure 2-6). Select any channel and connect the voltage source to the
+
and
-
inputs ensuring the correct polarity. Turn on the Voltage Source and allow 10 minutes for it to warm
up and stabilize.
6.3.1.2 Programming Calibration Scales
From the Hidden menu use the
UP (
↑↑↑↑↑
)
or
DOWN (
↓↓↓↓↓
)
button to select
ADC control
and then press the
ENTER
button. The only available option is
Cal Adc
so just press the
ENTER
button. Use the
UP (
↑↑↑↑↑
)
or
DOWN (
↓↓↓↓↓
)
button to highlight
Cal scales
and press the
ENTER
button. The Calibration Scale options will
be displayed.
6.3.1.3 Calibrating the Voltage Ranges
To calibrate any of the voltage ranges, a known good input must be supplied to the Recorder as shown in
the table below:
Range to Calibrate
Voltage Source
150 mV
150 mV
1.25 V
1.25 V
2.5 V
2.5 V
12.5 V
12.5 V
25 V
25 V
Set the precision Voltage Source for the appropriate range. Then use the
UP (
↑↑↑↑↑
)
or
DOWN (
↓↓↓↓↓
)
button to
select the range in need of calibration and press the
ENTER
button. You will be prompted with “cal input?
X”. Use the
UP (
↑↑↑↑↑
)
or
DOWN (
↓↓↓↓↓
)
button to select the channel input number (1, 2, 3, 4, 5 or 6) to which the
Voltage Source is connected and press the
ENTER
button. You will be prompted with “APPLY [range
selected]”. With the Voltage Source connected and turned on, press the
OK?
button. A window will
appear showing the reading of the Voltage Source connected.
NOTE:
If the calibration is not correct, the value shown in the window will not be correct.
Press the
CAL.
button. You will then be prompted with “Are You Sure?”. Press the
CAL.
button to
continue the calibration or the
NO
button to abort. If the
CAL.
button is pressed, the Recorder calibrates
the selected range. Repeat for the remaining voltage ranges.
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