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M A I N T E N A N C E
3
C H A P T E R
Calibration Adjustments
Warm-Up
The LDT-5525 should be allowed to warm up for at least 1 hour before calibration.
Calibration Adjustments
There are two calibration adjustments that need to be made for the LDX-3500
Series Precision Current Source. They are calibration of the constant current
source for both bandwidths and ranges, and calibration of the constant power
(I
) feedback circuits for both ranges.
PD
The LDX-3500 implements a two-point calibration. Two currents are applied to a
load, and the resulting measured currents are fed back (by the user) to the LDX-
3500 Precision Current Source. The LDX-3500 calibration program uses the two
sets of data to calculate calibration constants that it will thereafter use to set
current.
If a problem arises during calibration which prevents its normal completion, the
calibration may be aborted with no ill effects by simply turning the power off. Then,
at power-up, the old calibration values will be initialized and the user may
re-calibrate. This is possible because the calibration values are not saved to non-
volatile memory until the last step of calibration.
If an open-circuit condition occurs during calibration, the calibration mode will
abort automatically, with no ill effect to the calibration data.
Current Source Calibration
The following procedure is for calibrating the output current measurement and set
point. This procedure calibrates the circuits for the constant current modes. When
the calibration set point values are reached and are stable, the user enters the
actual value of the current, as measured by an external DMM. The LDX-3500
Series Precision Current Source then automatically calibrates the current limit
circuits.
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LDT-5525
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