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User Manual - Rev AJ
California Instruments
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.
available outpu
and must be ca
tem configuration you have (e.g.
MX45-1 or MX45-3 without -R option), skip to the relevant output range
.
range if available. The option -HV range
high range (300VAC) is not
available. If
ng
s are available,
calibrate the
Note:
Selecting the calibration screen (by entering the Cal Password) will turn off the ALC
e to be re-entered to allow calibration.
Connect the test equipment to the power source depending on model configurations as shown
an MX60, MX90 or an MX135 configuration is similar to
DC Offset measurements:
If the DMM used to perform DC offset calibration has trouble rejecting AC noise in VDC mode
(measureme
y be necessary t
uit at the output of the
amplifier to measure the DC offset. A 100Kohm RN60 1/4W (CI P/N 560131) and 22uF, 35V (CI
Follow the steps outlined in this section to perform a routine output calibration. Note that each
t range (except -HV and -XV options) has its own output calibration coefficients
librated. If a range is not available on the sys
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
can be done only if the
e and the
both the standard high ra
-HV or -XV optional range
standard range.
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:
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.
nt not stable), it ma
o use a small filter circ
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.
Low
AMPLIFIER
OUTPUT
High
DMM
VDC
Pos
Neg
100 Kohm
22 uF
Figure 6-4: DC offset AC filter
MX
Series
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