NF FRA5087, Instruction Manual

Page: 104 / 194

4.11 Calculation functions
FRA5087
4-30
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CAUTION

The FRA5087 has the maximum memory capacity of 20,000 points.
Therefore, the calculation capabilities are limited to approximately 6,000 data
points for operations of the four rules of arithmetic or of the open- and
closed-loop conversion using measurement data only, and to approximately
10,000 data points for operations of differentiation or integration, of the four
rules of arithmetic or of the open- and closed-loop conversion using constant
numbers and measurement data.

Recording/storage of data into memory
The data resulting from calculations will be deleted upon activation of
consecutive calculations. If you need or want to later use calculation result
data, record or store them in the master data memory or the permanent data
memory.

Types of data
There are two types of data that you deal with. They are raw measurement
data (RAW) and data that have been operated/calculated (OPERATED). For
RAW data, calculations are performed according to the menu setting
[Graph][FORMAT][ANALYSIS MODE] (selection from [CH1/CH2],
[CH2/CH1], [CH1] and [CH2]). Check the setting status before starting
calculation operations by all means.
After completion of calculation operations, OPERATED data are produced.
When OPERATED data are again used for further calculations, you do not need
to set [ANALYSIS MODE].

Operation of the four rules of arithmetic between data
The frequency of [DATA1] will be used for calculations when calculation
operation of the four rules of arithmetic is applied to data (i.e., data vs. data).
When this frequency is higher than the maximum frequency of [DATA2], the
amplitude and phase of the data at the maximum frequency are used as the data
of [DATA2]. Similarly, when the frequency of [DATA1] is lower than the
minimum frequency of [DATA2], the amplitude and phase at the minimum
frequency is used as the data of [DATA2].
When calculations between data are used for open- and closed-loop
conversions, the frequency of [DATA] is used. The calculation methodology
will be the same when the frequency is higher than the maximum frequency of
the data of [Tm] and when the frequency is lower than the minimum frequency
of the data of [Tm].

Operation of the four rules of arithmetic between constants
In the four rules of arithmetic operations between constants (i.e., constant vs.
constant), the calculation frequency used will be the same as the actual
frequency of the measurement which has been done according to the menu
[Measure][SWEEP FUNCTION]. (For calculation purposes, the setting of
[SLOW SWEEP] is treated as “OFF”.)
In certain settings, the volume of data could become too large to be stored in the
memory.
When you want to produce complex numbers by applying the four rules of
arithmetic operations to constant values, you can save the memory capacity by
setting equal values for [MAX FREQUENCY] and [MIN FREQUENCY] of
[SWEEP FUNCTION].

Calculation precision
The precision of the calculation result is 5 digits. Note that calculation errors
would be generated when the actual open-loop gain is more than 10,000 times
of the closed-loop gain in the closed- to open-loop conversion calculation.

Key operations during calculation
No key entries are accepted during calculation operations. Note that it will
take a considerable period of time to complete calculations involving a large
number of frequency points. Note, also, that all key entries during
calculations will be invalid.