AMETEK RS Series - Manual (Page 148)

User Manual AMETEK Programmable Power
RS Series 148
6.4 Routine Output Calibration
For best results, it is recommended to perform the measurement calibration procedure first. See
section 6.3.
Follow the steps outlined in this section to perform a routine output calibration. Note that each
available output range (except -HV and -XV options) has its own output calibration coefficients
and must be calibrated. Table 6-3 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 and DC 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 or -XV optional ranges are 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 6-1. 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 6-3: DC offset AC filter