3.5 Basic Operations
3-37 ZM2371/ZM2372
Rd-min: The minimum output impedance setting menu is as follows.
R-drive min: 25 Current setting
0)5 1)25 2)100 Options
5 Sets the minimum output impedance to 5.
25 Sets the minimum output impedance to 25 (initial value).
100 Fixes the output impedance to 100.
If a setting is made or the EXIT operation is performed, one-previous menu comes back.
If 100 is selected, the output impedance of drive signal source is fixed to 100.It is
useful in measuring the inductor which requires constant current and constant output
impedance.When you set the measurement range to 100m or 1, the recommended
range, measureable range, and measurement accuracy are same as 10 range.Under 0.9,
be careful about the measurement accuracy degradation.
If 25 is selected, the output impedance of drive source becomes 100 (measurement
range ≧10) or 25 (measurement range ≦1) according to the measurement range.
If 5 is selected, the output impedance of drive source becomes 5, provided that the
following conditions are all fulfilled. If not fulfilled, it becomes 100 or 25 according to
the measurement range.
Measurement range ≦ 10 DC bias is OFF ALC is disabled
Measurement signal level ≦ 1V DC resistance is not measured
For example, when the capacitors (impedance < 10) having large capacitance exceeding
150F at 120Hz are measured, the signal settling time can be reduced if the output
impedance is set to 5.
When setting the output impedance to 5, beware of the following points:
・If the output impedance is lowered with the measurement signal level maintained, the
voltage applied to the DUT will increase. Reduce the measurement signal level in
advance when measuring the DUT weak to the reverse voltage or overvoltage.
・Residual charge protection level lowers.
Provide an external protection device as necessary.
When a number of DUTs are measured
Hold the measurement range when measuring a number of DUTs having almost same value.
In a low impedance range, a mechanical relay is used to switch the range. Though the range
switching time in automatic selection is long, taking the relay lifetime into consideration,
the wear of relay and increase of measurement time can be avoided by holding the
measurement range.
Measurement range of DC (direct-current) resistance
If DC resistance is selected as a secondary parameter, the measurement range of DC
resistance is displayed in the measurement range setting menu. The DC resistance
measurement range is independent from the AC impedance measurement range, and
normally it is automatically selected. In the remote control, it can be held to specific ra nge.
To return to automatic selection by the panel operation, initialize it with the initialize menu.
DC resistance measurement range
RANGE: Manual 100k DC100m Rd: 25 -
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