Hioki DM7275 Series - 6 Useful Functionality; Obtaining Stable Measured Values; X84; Setting the Integration Time

67
6
UsefulFunctionality
6.1 Obtaining Stable Measured Values
Setting the integration time
Readings for the measurement signal input to the instrument are averaged over the set time
and displayed as measured values. The time over which the signal is averaged is known as the
integration time and can be set as desired. In general, longer integration times yield more stable
measured values.
Preset integration times have been assigned to the FAST, MEDIUM, and SLOW measurement
speeds.
Unit Setting
Integration
time
Measurement speed
Measurement precision
(Effectofexternal
environment)
PLC
0.02PLC
0.02 PLC*
Fast
Slow
Low
(More susceptible to
effects)
High
(Less susceptible to
effects)
0.2PLC
0.2 PLC
1PLC
(FAST) 1 PLC
10PLC
(MEDIUM) 10 PLC
100PLC
(SLOW) 100 PLC
ms 1 ms to 9999 ms As set As set As set
* “PLC” stands for power line cycle, where 1 PLC is equivalent to the duration of one cycle of the
power being supplied to the instrument. In areas with 50 Hz power, 1 PLC = 1/50 = 20 ms, while
in areas with 60 Hz power, 1 PLC = 1/60 = 16.7 ms.
The unit in which the integration time is set can be switched between milliseconds and power line
cycles.
This function is useful when the DC voltage you are measuring has superposed AC noise. You can improve
the stability of measured values by setting the integration time to a whole multiple of the noise period.
Example: For a noise frequency of 40 Hz
Noise period = 1/40 = 25 ms
→ Set the integration time to 25 ms, 50 ms, 75 ms, etc.
0 V
Measurement
voltage waveform
Integration time
Integration time
Integration time
6 Useful Functionality
6
Useful Functionality
w ww . . co m
information@itm.com1.800.561.8187