California Instruments BPS Series, Руководство пользователя

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User Manual AMETEK Programmable Power
BPS Series 126
7.4 Routine Output Calibration
For best results, it is recommended to perform the measurement calibration procedure first. See section
7.3.
Follow the steps outlined in this section to perform a routine output calibration. Note that each available
output range (except -HV option) has its own output calibration coefficients and must be calibrated. Table
7-3 shows the individual calibration points in a summary format. The following text is a more detailed
explanation of the procedure.
The full-scale calibration should be done in the AC mode for both the low and high range if available. The
option -HV range can be done only if the high range (300VAC) is not available. If both the standard high
range and the -HV optional range is available, calibrate the standard range.
Note: Selecting the calibration screen (by entering the Cal Password) will turn off the ALC mode.
Conversely, turning on the ALC mode will turn off the Calibration mode. If the ALC mode is turned off
during calibration, the cal password will have to be re-entered to allow calibration.
Setup:
Connect the test equipment to the power source depending on model configurations as shown in Figure
7-1. For multi-phase systems, each phase has to be calibrated individually. Note that no load is required
for most output calibrations.
DC Offset measurements:
If the DMM used to perform DC offset calibration has trouble rejecting AC noise in VDC mode
(measurement not stable), it may be necessary to use a small filter circuit at the output of the amplifier to
measure the DC offset. A 100Kohm RN60 1/4W (CI P/N 560131) and 22uF, 35V (CI P/N 611267) series
network can be used in this case as shown below. Use this circuit only while performing DC offset checks
and remove for other calibrations.
Figure 7-3: DC offset AC filter