IEEE 1122-1998 pdf download IEEE Standard for Digital Recorders for Measurements in High-Voltage Impulse Tests
1.Scope
This standard is applicable to digital recorders and digital oscilloscopes used for measurements during testswith high-impulse voltages and high-impulse currents. lt covers the measuring characteristics and calibrations required to meet the measuring accuracy specified in EEE Std 4-1995 and IEEE Std C57.98-1993[B101.1
The characteristics of genera-purpose digital recorders are covered in lEEE Std 1057-1994 (B9). Generalmethods of pulse measurement are covered in EC 60469-1 (1987-12) B4 and IEC 60469-2 (1987-12B5].
This standard
a)Defines the terms specifically related to the digital recorders used for monitoring high-voltage andhigh-current impulse tests;
b)Specifies the necessary performance characteri stics for such digital recorders to ensure their compliance with the requirements for high-voltage and high-current impulse tests;Describes the tests and procedures that are necessary to show that these performance characteristicsare within the specified limits
2.References
This standard shall be used in conjunction with the following publication:EEE Std 4-1995.1EEE Standard Techniques for High-Voltage Testing.
3. Denitions
3.1 actual resolution
The logarithm to base 2 of the [(maximum value used, , minus the value corresponding to the baseline, )/(the standard deviation of the noise, times )].
NOTE—The rated resolution is the maximum resolution that could be achieved when measuring an impulse whose peak-value is equal to the full-scale range and when there is no reduction in the effective resolution caused by non-ideal behavior of the digital recorder. Reductions in resolution caused by using less than full-scale deection can be quantied (e.g., an 8-bit recorder has a rated resolution of 1 in 256). The resolution used to record an impulse is approximately 1 in (maximum value minus minimum value). For a (maximum minus minimum) value of 198 the number of bits is reduced to 7.63 (0.37 lost bits) while for a value of 98 the number of bits is equivalent to 6.61 (1.39 lost bits). The resolution is also reduced by noise and the total reduction in resolution gives an actual resolution which is the logarithm to base 2 of the [(maximum value minus minimum value)/(the standard deviation of the noise times )]; see equation 97 of IEEE Std 1057-1994 [B9].
3.2 automatically processed data: The data available from the digitizer when some processing function cannot be avoided.
3.3 average code bin width (W,): The product of the full-scale value and the rated resolution.
NOTE- -The average code bin width is equal to the static scale factor.
3.4 code bin width of code k (Wk): The range of input voltage allocated to code k (see Figure 1).

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