California Instruments 2253i, Руководство пользователя

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User Manual 2253i / 2253iX
AMETEK California Instruments 95
6. Calibration
The Routine Calibration should be performed every 12 months. Non-routine Calibration is only
required if a related assembly is replaced or if the periodic calibration is unsuccessful. Calibration of
the i/iX system can be performed from the front panel or over the bus. This section covers calibration
from the front panel.
6.1 Recommended Calibration Equipment
Digital Multimeter: Fluke 8506A, 8508 or equivalent.
10 mOhm Current Shunt: Isotek Model RUG-Z-R010-0.1.
Load Bank: Various power load resistors or a resistive load bank will be needed.
Size of the load bank depends on model. A load is required to
perform the current measurement calibration near full scale. Current
measurement calibration should be done on the lowest available
voltage range.
The accuracy and value of the load resistor is not critical as long as
the current drawn is sufficient to operate the AC Source in the upper
current range (80-100 %). Suggested values of load bank settings are
shown in Table 6-1.
6.2 Calibration Screens
The calibration screens for output or measurement calibration can be selected from the MENU screen.
(Press MENU button several times to toggle to select the CALIBRATION screen.)
To select the CALIBRATION screen press the MENU key several times to select MEAS CAL. Then
press the
ENTER key. This will bring up the PASSWORD screen. To prevent unauthorized access to
calibration data, a password must be entered to access any calibration screen. The calibration
password is a numeric value equal to the high voltage range limit. This value is 300.
The password can be entered using the shuttle or the keypad. Once the correct value is set, press the
ENTER key. Once set, the calibration screens remain accessible until the power source is powered
down. If you leave the calibration screen and return, toggle the value up or down and back, followed by
the
ENTER key to re-engage the calibration mode.
To select the MEASUREMENT CALIBRATION screen, follow the same steps as outlined above and
select the MEAS CAL entry. If another CALIBRATION screen has been accessed since power-up, no
password is needed. Otherwise, enter the password as indicated above.
6.3 Measurement Calibration
The i/iX Series controller measures voltage and current by digitizing both voltage and current
waveforms on each available output phase. This data is subsequently processed and used to calculate
all measurement parameters such as VRMS, IRMS, Power, VA, and Frequency etc. To calibrate all
measurements, only the voltage and current measurement need to be calibrated specifically. All other
measurements are derived from these.
Connect the test equipment to the power source.
Note: The Fluke 8506A or 8508 Digital Multi meter (or higher AC accuracy DMM) must be used
for the following calibration. The DMM must be set to the AC HI ACCUR mode for all
AC measurements.