4-7
IM 253710-01E
Common Operations
4
4.5
Using the NULL Function
Keys
• The
mark indicates the keys that are used for the operation.
• To exit the menu during operation, press the ESC key.
CONFIGURATION
ELEMENTS
VOLTAGE
CURRENT
FILTER
1
FILTER
FILTER
FILTER
2
3
4
RES
ET SELECT
CH
8
CH
6
CH
4
CH
2
CH
7
CH
5
CH
3
CH
1
OBSERVATION TIME
TRIG’ D
ACQ
REMOTE
MENU
SHIFT
NULL
CAL
COPY
LOCAL
HELP
MISC
FILE
ZOOM
CURSOR
MATH
DISPLAY
SETUP INPUT MEASURE TRIGGER
ABORT
E S C
SINGLE
START
START/STOP
Procedures
Press the NULL key to activate the NULL function. The indicator on the NULL key lights.
Explanation
NULL value
When the NULL function is turned ON, the NULL values are set to the Udc and Idc
values (numerical data of the simple average of the voltage and current during the
normal measurement mode, U(dc) and I(dc) during the harmonic measurement mode)
as well as Speed and Torque (when using the motor module and the input signal from
the sensor is a DC voltage) that were measured the previous time. If the previously
measured Udc and Idc as well as Speed and Torque values do not exist, such as
when the NULL function is turned ON without making a measurement after turning ON
the power, Udc and Idc are set to zero.
Note
When setting the NULL value, we recommend the voltage and current measurement ranges
be set as small as possible. The measurement resolution is higher when the measurement
range is small which results in a more accurate measurement of the NULL values.
Measurement functions that are affected by the NULL function
The NULL values are subtracted from the sampled data. Therefore, all measurement
functions are affected by the NULL values.