34951A 4-Ch Isolated Dac Module - Keysight Technologies 34959A Service Manual

3 Calibration Procedures

34951A 4-Ch Isolated DAC Module

Each isolated DAC output channel can be measured and adjusted using the
internal DMM. The Internal DMM is recommended because it compensates for
ambient temperature.
The 34951A features "auto-calibration". Upon receipt of the calibration command,
all channels on the DAC are adjusted using the internal DMM. Additionally you
may adjust ALL 34951A modules installed in the instrument with one command.
The adjustments require approximately one minute per module.
The 34951A 4-Ch Isolated DAC is intended to be adjusted frequently to
NOTE
compensate for changes in the module's environment (changes in ambient
temperature, changing the mainframe slot used, adding or removing modules to
a system). These adjustments can be made either volatile or non-volatile as
described below. The adjustment procedure is given beginning on
There are two ways to adjust the DACs, depending upon the state of calibration
security (see
– If the instrument is secured for calibration when the adjustment is begun, the
– If the instrument is unsecured for calibration, the adjustments are written to
62
"Calibration Security"
adjustments are considered volatile. All adjustments are discarded when
power is cycled. This provides an easy means to make immediate
temperature-compensated adjustments to the DAC outputs without
overwriting stored calibration constants.
When this type of adjustment is made, the calibration count (see
not advanced.
non-volatile calibration memory. The calibration count (see
advanced.
on page 41).
Keysight 34980A Service Guide
page 66.
page 42) is
page 42) is