Yokogawa PC-Based MX100 - Manual (Page 17)

1-8 IM MX100-01E
Measurement Time (When Using the MX100 Standard Software)
When a measurement start request or a measurement data output request is made by
a PC to the main module, the PC’s time information is transmitted to the main module.
The main module generates measurement time using the internal clock based on the
time when the measurement start request is received. When the measured data is sent
to the PC, the PC’s time information along with the measurement time information on
the main module is returned to the PC. The time information used in the monitoring
of the measured data on the PC is that of the main module. When measurement is
made over an extended time, the time between the PC and main module may be
misaligned (up to 60 seconds in one week excluding the accuracy of the PC clock). As
a remedy to this problem, when the measured data is recorded (saved) on the PC, the
PC’s time information is stored along with the measurement time information on the
main module. When the Viewer of the MX100 Standard Software is used to open the
recorded measurement data, the “time synchronization” function can be used to correct
the measurement time relative to the PC’s time based on the PC’s time information.
For details on the time synchronization function, see the Technical Information, MX100
Performance Specifications (TI 04M08B01-00E). For information on obtaining a copy,
contact your nearest YOKOGAWA dealer.
Range Over
When the MW100 detects a range over (see below) on a measurement or MATH
channel, “+Over” or “-Over” is displayed.
• Measurement channel range over
• During DC voltage input, strain input, and resistance (20 Ω, 200 Ω, etc.), a range
over is detected if the value that is measured on a measurement channel is outside
of the measurable range by more than ±5%. For example, when the measurement
range is 2 V, the measurable range is -2.0000 to 2.0000 V. If the voltage exceeds
2.2000 V or goes below -2.2000 V, a range over is detected.
• During high-resolution DC voltage input and pulse input, a value less than 0% of
the measurable range is a negative range over, and a value greater than 105% of
the measurable range is a positive range over.
• If the input type is thermocouple or RTD, excluding the cases where the
thermocouple or RTD has a special range, a range over is detected when the
temperature goes more than approximately 10°C above or below the measurable
range. For example, when the measurement range is set to R, the measurable
range is 0.0 to 1760.0°C. If the temperature exceeds 1770.0°C, “+Over” will be
displayed. If the temperature goes below -10.0°C, “-Over” will be displayed. The
special ranges mentioned here are ranges such as KpvsAu7Fe or J263. If you
are using a special range, “-Over” will be displayed if the temperature goes below
approximately 0°C.
• On channels that use linear scaling, the range-over values, after removing the
decimal point, are above 32000 and below -32000. However, even if the measured
value is within ±30000, if it is a range-over value according to the previous range, it
will be handled as a range-over value.
• When you are performing differential computation between channels (see
"Computation" on next page), if the measured value is outside of the measurable
range, a range over will be detected. When you are using a sensor such as a
thermocouple, the measurable range when performing differential computation
between channels may be larger than the measurable range when not performing
differential computation between channels.
1.2 Main Module Functions