YOKOGAWA WT210, Руководство пользователя, Страница: 189 / 316

12-4
IM 760401-01E
12.3 Performing Zero-Level Compensation
Keys
CHECK RANGE MODE
UPDATE
SCALING AVG LINE FREQ STORE RECALL HARMONICS KEY LOCK
FILTER
A
B
C
VOLTAGE VOLTAGE
VOLTAGE
AUTO
MODE
CURRENT
AUTO
RANGE
MAX HOLD TRIG
CAL
INTEGRATOR
INTEG SET
SHIFT KEY LOCK
1P 3W 3P 3W
3P 4W 3V 3A
OUTPUT
HARMONICS MEMORY
REMOTE
MEAN
CURRENT RMS DC
FUNCTION ELEMENT
MAX HOLD
HOLD
ENTER
RESET
WIRING
START STOP
LOCAL SETUP
1
m
V
k A
V
TIME
ar
deg
h
h
VA
M W
m
V PF
k A
M W
m
V Hz
k A
M W
2 3
FUNCTION ELEMENT
1 2 3
FUNCTION ELEMENT
1 2 3
%
The explanation given in this section uses WT230 as an example. For the differences between
the WT210 and the WT230, see section 2.2, “Operation Keys and Functions/Element Display.”
Procedure
SHIFT CAL
ENTER (Execute zero-level compensation)
Explanation
Zero-Level Compensation
This function is used to create a zero input condition using the internal circuit of the
WT210/WT230 and setting the level at that point to zero level. Zero-level
compensation must be performed to meet the specifications of the WT210/WT230
(see chapter 16).
Zero-level compensation is executed when you carry out the following operations.
• When you press the SHIFT key to illuminate the indicator above and to the left of
the SHIFT key followed by the ENTER key.
• When you change the measurement range.
Note
• For making accurate measurements, we recommend zero level compensation to be
performed after warming up the instrument for at least 30 minutes. In addition, the ambient
temperature needs to be within the specifications (see chapter 16) and stable.
• If the measurement mode, measurement range, and input filter are not changed over a long
period of time, the zero level may change due to the changes in the environment surrounding
the instrument. It is recommended that zero level compensation be performed in this case.