Routine Output Calibration; Figure 6-4: Dc Offset Ac Filter - California Instruments MX30-1 User Manual

User Manual - Rev AJ

6.4 Routine Output Calibration

For best results, it is recommended to perform the measurement calibration procedure first. See
section 6.3. The MX Series I has more calibration coefficients than the MX Series II. Where
relevant, this is indi cated. On Series II models, the output calibration screens will show only
available cal factors.
Follow the steps outlined in this section to perform a routine output calibration. Note that each
available outpu
and must be ca
MX45-1 or MX45-3 without -R option), skip to the relevant output
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
available. If both the standard high ra
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 hav
Setup:
Connect the test equipment to the power source depending on model configurations as shown
in Figure 6-1and Figure 6-2. Setup for
that shown in Figure 6-2 with the master sense terminal block used for external voltage sense.
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
(measureme nt not stable), it ma
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.
164
t range (except -HV and -XV options) has its own output calibration coefficients
librated. If a range is not available on the sys
ng
y be necessary t
AMPLIFIER
High
100 Kohm

Figure 6-4: DC offset AC filter

tem configuration you have (e.g.
can be done only if the
e and the -HV or -XV optional range
e to be re-entered to allow calibration.
an MX60, MX90 or an MX135 configuration is similar to
o use a small filter circ
Low
OUTPUT
22 uF
Pos Neg
DMM
VDC
California Instruments
range. Table 6-3 shows the
high range (300VAC) is not
s are available,
uit at the output of the
MX Series