YOKOGAWA YewSeries 80 STED Style S, Руководство пользователя

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6-4
IM 01B04J01-02E
6.3 Adjustment
6.3.1 Adjustment for STED-1 to -4 Types (One Input-only Type)
The inputs of STED-1 to -4 types are different, but the way for adjustment is the same.
(a) Connect the test equipment corresponding to each input referring to Figure 6-1 through
Figure 6-4.
(b) Turn on the power while the equipment is connected to the instrument, and allow a
warm-up period of about 5 minutes.
(c) Press the Zero adjustment push-switch on the front panel for 3 seconds or more to enter
the adjustment mode.
(d) Apply an input equivalent to 0 % of the input range and read the output on the digital
voltmeter. It should be within the range 1 V ± 0.02 V. If the error is too large, apply
an input equivalent to 0 % of the input range, then press the Zero adjustment push-
switch for adjustment. When pressing the push-switch for 1 second or more, the output
increases in the fixed ratio. When pressing the push-switch again for 1 second or more
after releasing the push-switch, the output decreases in the fixed ratio. Perform the
adjustment while checking the output.
(e) Apply an input equivalent to 100 % of the input range and read the output on the digital
voltmeter. It should be within the range 5 V ± 0.02 V. If the error is too large, apply an
input equivalent to 100 % of the input range, then press the Span adjustment push-
switch for adjustment. When pressing the push-switch for 1 second or more, the output
increases in the fixed ratio. When pressing the push-switch again for 1 second or more
after releasing the push-switch, the output decreases in the fixed ratio. Perform the
adjustment while checking the output.
(f) Adjustable range is ± 5 % of span for mV DC/RTD/Thermocouple input and ± 10 % of
span for potentiometer input.
(g) Check that the output error for 25 %, 50 %, and 75 % of input range is within the
accuracy. If necessary, apply inputs equivalent to 25 %, 50 %, and 75 % of input range,
then press the Zero adjustment push-switch for adjustment.
(h) This instrument is provided with 3 outputs, but the adjustment for only one of the 3
outputs is enough.
• Do not open the terminal cover while adjusting the thermocouple input in order to
maintain all terminals at the same temperature.
• When the lead wire resistance is large (when using the safety barrier such as
BARD in combination with the instrument, it is equivalent to the increase of the
lead wire resistance), the error of zero point may occur. Perform zero adjustment in
the condition close to mounting condition.
• When performing the adjustment by current output, connect the parallel resistance
(250 Ω ± 0.05 %) and check voltage.
• When performing span adjustment immediately after the zero adjustment (shorter
than 1 minute), pressing the Zero adjustment push-switch for 3 seconds or more is
not required.
• The adjustment mode ends if the push-switch is not pressed for 1 minute or more,
then the instrument enters the normal mode.
• Do not turn off the power to the instrument during adjustment.