Yokogawa DR240 - Manual (Page 231)

14-4 IM DR231-01E
14.1 Specifications of DR130/DR231/DR241 (Style S3)
Measured Data Items
For each module, a maximum of six data items can be selected from the effective voltage,
effective current, active power, apparent power, reactive power, frequency, power factor and
phase angle. The selected data items can then be assigned to channel numbers xx1 to xx6 to show
them on the display as well as record them. Restrictions apply to the combination of selectable
data items, however, depending on the method of input wiring.
Conditions of Measurement
• Measuring range for current and voltage inputs
10% of the measuring range < current and voltage inputs ≤ 100% of the measuring range
• V1 range is monitored in frequency measurement
• All measurements are done relative to the frequency on a channel for V1 and, therefore, the
results of measurements are not guaranteed if the V1 input is out of the range noted above.
• If the input apparent power falls below 10% of the span, the DR recorder cannot measure the
phase and power factor (negative overflow).
• A maximum of two scans' worth of data become invalid immediately after a change has been
made to the measuring range and/or wiring.
Measuring Accuracy and Resolution
As described below, under the following operating conditions:
Ambient temperature: 23
±2°C; ambient humidiy: 55 ±10% RH; power supply voltage: 90 to
250 VAC (AC power supply) or 10 to 32 VDC (DC power supply)/90 to 132/80 to 250 VAC
(when /P6 option is specified); power supply frequency: 50/60Hz within
±1%; warm-up time
30 minutes or more; vibrations and others not affecting instrument operation.
However, RTD input is not available with the DCV/TC/DI input module
Measured Data Item Measuring Accuracy Resolution
Effective voltage
± (0.5% of SPAN)
0.01 Vrms (for 25-V range), 0.1 Vrms (for 250-V range)
Effective current ± (0.5% of SPAN) 0.0001 Arms (for 0.5-A range), 0.001 Arms (for 5-A range)
Active power ± (1% of SPAN) φ = 0 0.01 W (for 12.5-W, 25-W and 37.5-W spans)
± (2.5% of SPAN) 0 <| φ |≤ 30 0.1 W (for 125-W, 250-W and 375-W spans)
± (5% of SPAN) 30 <| φ |≤ 80
1 W (for 1,250-W, 2,500-W and 3,750-W spans)
Apparent power ± (1% of SPAN) 0 ≤| φ |≤ 80 0.01 VA (for 12.5-VA, 25-VA and 37.5-VA spans)
0.1 VA (for 125-VA, 250-VA and 375-VA spans)
1 VA (for 1,250-VA, 2,500-VA and 3,750-VA spans)
Reactive power
± (5% of SPAN) 0 ≤| φ |< 60
0.01 Var (for 12.5-Var, 25-Var and 37.5-Var spans)
± (2.5% of SPAN) 60 ≤| φ |≤ 80
0.1 Var (for 125-Var, 250-Var and 375-Var spans)
1 Var (for 1,250-Var, 2,500-Var and 3,750-Var spans)
Frequency ±0.1Hz 0.01Hz
Power factor
± (2% of SPAN) 0 ≤| φ |≤ 80
0.01
Phase angle ±5deg 0 ≤| φ |≤ 80 0.1deg