Hioki SW9001, Инструкция по эксплуатации

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35
Precautions for Measurement
3.6 Precautions for Measurement
Use in combination with BT3562 or BT3563
Contact check does not operate properly at 3000
Ω
range. Also be aware that contact check cannot
be performed properly in the voltage function, either.
Use in combination with BT3561A, BT3562A or BT3563A
It may take some time for measured voltage value to be stabilized (such as when connecting a
channel from open state). When the measured voltage value is unstable, set the channel delay time
to 100 ms or longer.
Use in combination with BT4560
Use the device with BT4560 for external trigger measurement or single measurement using the
:READ?
command.
When using the device for internal trigger (free running), the life time of the relay is shortened as
the channel is switched during measurement (hot switching).
As the measurement current for BT4560 is 1.5 A (3 m
Ω
range), heat generation at the relay contact
becomes high. With heat generation, the thermoelectric power may become high.
Use in combination with DM7275 or DM7276
If a measurement accuracy of a few µV is required, there is an effect by the thermoelectric power
due to coil heating of the channel relay. Minimize the close time of each channel to reduce this
effect as much as possible. Use single measurement using the
:READ?
command or external
trigger and open the channel immediately after the measurement (heating from the relay coil is
controlled).
Measured value variation may be significant when connected at the same time as the IM3590.
If you encounter this issue, enable the IM3590’s trigger synchronous output function.
Use in combination with IM3590
Execute open correction and short correction to each channel you will use.
Error might occur to open correction and short correction due to high frequency. (Set the frequency
range you will correct when executing.)
Threshold value of the contact check might be larger than the setting.
Also, the inspection result of the contact state (the resistance value near the threshold) might vary.
Use in combination with RM3545
When the instrument is used with its offset voltage compensation function (OVC) disabled, the
thermoelectromotive force generated by the coils of the channel relays generating heat will affect
measured resistance values. It is recommended that measurement be performed with as little time
as possible after the contact of the channel relay is closed (however, if the object to be measured
is a component that takes a long time to respond, such as a coil, it is necessary to wait for the time
required for response before starting measurement). Suppose the contact of the channel relay in
high-temperature conditions (after the channel was closed for a certain period or after measurement
was repeated while the channel was being switched) was closed after being opened for a few
seconds or a few minutes. In such a case, the thermoelectromotive force at the contact of the relay
may not be stable, shifting measured resistance values. If this happens, allow a few seconds to a
few minutes for the stabilization time to check that the measured value stabilizes. For measurement
of high-resistance (100 k
Ω
or more) components, measured values may not be stable due to the
effect of noise, including hum.
3
Channel Switching
HIOKI SW1001A961-04