IM CA12E-02E <Page 1>
To return to the previous step:
<9> To return to the previous step without fixing the setting, press and hold the
input
cancellation key for about 1 second.
Note that this is possible only before writing to the EEPROM.
To return to the nomal operation mode:
<10> Simultaneously press and hold the
keys (shown in the figure in the
“Assignment of Keys for Calibration” section below) for about 2 seconds, or press
the [POWER] key to turn off the power once and then press it again to turn it back on.
■ Calibration Precautions
(1) Calibration for 400 Ω generation
Set resistance-measuring current to 1 mA.
Check the specifications of the digital multimeter (DMM) to be used as the standard.
Example:
Resistance-measuring current is 1 mA for the 2000 Ω range of Model 7561 (Yokogawa).
Connect the CA12E calibrator to the standard in a four-wire connection configuration
for calibration as shown below:
3W
Lo Lo Hi
CA12E
DMM
2000 Ω range
H
L
Input terminal Sensing terminal
Standard
(2) Calibration for 400 Ω measurement
Connect the CA12E calibrator to the standard in a three-wire connection configuration
for calibration as shown below:
3W
Lo Lo Hi
CA12E
Standard
Decade
resistance box
400
Ω
(3) Calibration for internal RJ compensation
Because this calibration requires special equipment (a K-type thermocouple and 0°C
reference temperature chamber), contact the sales agent or office where the instrument
was purchased, or our office.
■ Assignment of Keys for Calibration
When the CA12E calibrator is in the calibration mode, keys are assigned as specified here.
1
2
3
4
CAL
ON
SOURCE
0
Input cancellation key
Input determination
(ENTER) key
Digit to adjusted by
the adjustment keys
Mode switching
(calibration or nomal)
(Press and hold two keys
simultaneously for 2 seconds.)
Adjustment keys
(six keys)
(For about 1 second)
(For about 1 second)
■ Calibration the Measurement Feature
Operation procedure:
<1> Warm up the standard.
<2> Before turning on the power of the CA12E calibrator, connect it to the standard.
Be sure to remove the external RJ sensor.
<3> Turn on the power of the instrument.
<4> Simultaneously press and hold the
keys (shown in the figure in the
“Assignment of Keys for Calibration” section below) for about 2 seconds to enter
the calibration mode.
<5> Select the measurement range to calibrate using the MEASURE/SOURCE
selection switch and range selection rotary switch.
“CAL” and “MEASURE” appear and “FS” blinks on the display unit.
(If a value nearly equivalent to full scale has been input, a measured value and
“FS” appear.)
<6> Set up the standard in order to input the full scale value to the instrument.
Wait until the reading stabilizes, then press and hold the input determination
(ENTER) key for about 1 second to fix the setting.
<7> After fixing the setting, “0” and “FS” indications on the display unit start blinking.
Re-press and hold the input determination (ENTER) key for about 1 second
to write the calibration coefficients to the EEPROM of the instrument.
(This overwrites the previous calibration coefficients.)
When this is complete, the instrument returns to the status in Step 5.
<8> Repeat Steps 5 to 7 for each range to be calibrated.
To return to the previous step:
<9> To return to the previous step without fixing the setting, press and hold the
input
cancellation key for about 1 second.
Note that this is possible only before writing to the EEPROM.
To return to the nomal operation mode:
<10> Simultaneously press and hold the
keys (shown in the figure in the
“Assignment of Keys for Calibration” section below) for about 2 seconds, or press
the [POWER] key to turn off the power once and then press it again to turn it back on.
Safety Precautions
The following manual, including this manual, are provided as manuals for the CA12E.
Please be sure to read all manuals.
IM CA12E-03EN (Getting Started Guide: For Safety)
IM CA12E-01E (User's Manual - 1 - : Generation, Measurement, and Other features)
IM CA12E-02E (User's Manual - 2 - : Calibration procedure and Specification): This manual
8. Calibration Procedure
■ Calibration Procedure
To maintain a high level of accuracy, it is recommended that the CA12E HANDY CAL
be calibrated
annually.
The “Selecting the Standards” section below presents calibration methods using the
recommended standards.
■ Selecting the Standards
<Source feature>
Items to be
calibrated
Names of
standards
Range
Measuring
range
Accuracy
Remarks
DCV
Digital
multimeter
(DMM)
100 mV
Max. 110 mV
±(0.005%+5 μV)
Model 7561
(YOKOGAWA)
or equivalent
Ω
Digital
multimeter
400 Ω
Max. 440 Ω
Measuring current:
1 mA
±(0.005%+0.02 Ω)
<Measurement feature>
Items to be
calibrated
Names of
standards
Range
Measuring
range
Accuracy
Remarks
DCV
Standard DC
voltage generator
100 mV
100 mV
±0.01%
Model 2552
(YOKOGAWA)
or equivalent
Ω
Decade resistance
box
400 Ω
400 Ω
±0.01%
Model 279301
(YOKOGAWA)
or equivalent
■ Environmental Conditions for Calibration
Ambient temperature:
23 ± 1°C
Relative humidity:
45 to 75% RH
Warm-up:
Warm-up time as specified for the standard
■ Calibration Points
• The calibration points are as specified in the following tables.
• It is possible to independently select the necessary range to be recalibrated.
• Always calibrate the zero (0) point and full scale (FS) as a pair for generation.
<Source>
<Measurement>
Calibration points
Standard Value *1
Calibration points
Standard Value *2
100 mV
0
0 mV
100 mV
FS
100 mV
FS
100 mV
400 Ω
0
0 Ω
400 Ω
FS
400 Ω
FS
400 Ω
*1:
Make adjustments to CA12E according
to the reading of the standard
(CA12E output Value) as specified in
the table.
*2:
Set the value to the standard as
specified in the table.
■ Calibration the Generation Feature
Operation procedure:
<1> Warm up the standard.
<2> Before turning on the power of the CA12E calibrator, connect it to the standard.
Be sure to remove the external RJ sensor.
<3> Turn on the power of the instrument.
<4> Simultaneously press and hold the
keys (shown in the figure in the
“Assignment of Keys for Calibration” section below) for about 2 seconds to enter
the calibration mode.
<5> Select the generation range to calibrate using the MEASURE/SOURCE selection
switch and range selection rotary switch. The display unit shows “CAL,” “SOURCE,”
“ON,” “0,” and the lower limit.
<6> Read the output value of the CA12E using the standard (digital multimeter), and using
the
adjustment keys adjust the CA12E so that the output value is set to the offset
value. Then press and hold the input determination (ENTER) key for about 1 second
to fix the setting.
After fixing the setting, the display unit reading changes to “CAL,” “SOURCE,” “ON,”
“FS,” and a full scale of the range.
<7> Read the output value of the CA12E using the standard (digital multimeter), and using
the
adjustment keys adjust the CA12E so that the output value is set to the full
scale value. Then press and hold the input determination (ENTER) key for about
1 second to fix the setting.
After fixing the setting, the display unit shows “0 FS” blinking. Re-press and hold
the
input determination (ENTER) key for about 1 second to write the calibration
coefficients to the EEPROM of the instrument.
(This overwrites the previous calibration coefficients.)
When this is complete, the instrument returns to the status in Step 5.
<8> Repeat Steps 5 to 7 for each range to be calibrated.
User’s
Manual
CA12E
HANDY CAL
(Temperature Calibrator)
- 2 -
IM CA12E-02E
5th Edition: Dec. 2014
（
YMI
）
Printed in Korea
Keep this manual in a safe place so that
you can refer to it when necessary.
