Hioki DSM-8542, Instruction Manual, Page: 47 / 140

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Table 5.6 Integral Time and Full-scale Current Values of Various Ranges
Integral Time Range
Code 2ms 10ms 20ms 100ms
300ms
1 10mA 3.0mA 1.5mA 300µA 100µA
2 1.0mA 300µA 150µA 30µA 10µA
3 100µA 30µA 15µA 3µA 1µA
4 10µA 3.0µA 1.5µA 300µA 100nA
5 1.0µA 300nA 150nA 30nA 10nA
6 100nA 30nA 15nA 3nA 1nA
7 10nA 3.0nA 1.5nA 300pA 100pA
8 1.0nA 300pA 150pA 30pA 10pA
5.2.6 Setting integral time (sampling time)
Stable high-sensitivity current measurement is sometimes disabled due to impacts of
noise components contained in the input current. This meter performs A/D conversion
after integrating the input current to remove noise components for stable measurement.
The noise removal rate increases longer the integral time is and power source noise
(ham) can be greatly removed by increasing the integral time by integer multiplication of
the power source period.
A long integral time also increases the measuring time. Set an appropriate integral time
depending on measured resistance value (current value) referring to 5.1.5 Setting
measuring range.
The integral time can be set in increment of 1ms or 1PLC.
(1) Keying
(a) Press the [F5] PSET key to set up the Measuring Condition Setting screen.
(b) Move to “SAMPL:” operating the cursor moving keys [
◄
], [
►
], [
▲
] and [
▼
]
and input an integral time.
(c) [F4] and [F5] keys become the keys to select ms and PLC respectively. The
[F2] and [F3] keys change to the DOWN and UP functions respectively.
(d) Press the [F4] ms key to set input in the unit of ms, allowing setting of
integral time in increment of 1ms. The [F5] PLC key allows input in the unit
of PLC, allowing settings in increment of 2ms to 300ms and in increment of 1
to 15PLC.
[Note]
“PLC” stands for “one power line cycle” and is about 17ms at 60Hz and 20ms
at 50Hz.
[Notice]
Setting of an integral time changes the full-scale sensitivity of the current
measuring unit. Refer to 5.2.5 “Setting measuring range.”