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Appendix 3 Measurement of In-circuit Components
A4
Measure an in-circuit component after providing guarding.
Referring to the following figure, when measuring a resistance value
for the resistor
R
2
, even if the tips of the two probes are contacted
against the ends of the resistor
R
2
, considering the sum of the cur-
rent flowing through the resistor
R
2
and the current flowing through
the resistors
R
3
and
R
4
, what is obtained is the resistance value for
the parallel combination:
If as shown in the next figure a guard terminal is used, the current
flowing through the resistors
R
3
(not flowing through
R
4
) is absorbed
by this guard terminal, so that the resistance value for the resistor
R
2
is accurately measured.
Appendix 3
Measurement of In-circuit
Components
R
R
2
R
3
R
4
+
R
2
R
3
R
4
+
+
----------------------------------
=
R
4
R
3
R
2
R
1
H
L
Guard terminal
R
4
R
3
R
2
R
1
H
L
• The accuracy of measurement will not be improved in cases where for example
R
2
>>
R
3
and
R
3
is close to zero.
• Individual elements cannot be isolated and measured separately in compound circuits
consisting of the same element, for example two resistors as shown in the diagram.
However, individual elements can be isolated and measured separately in compound cir-
cuits such as an inductor and capacitor by using the IM9000 Equivalent Circuit Analysis
Firmware (option).
Isolated measurement is supported for five equivalent circuit models.
See
"5.10.1 About the Equivalent Circuit Analysis Function" (p. 238)
Two resistors in parallel
Coil and capacitor in parallel
Summary of Contents for IM3570
Page 2: ......
Page 8: ...Contents vi ...
Page 16: ...Operating Precautions 8 ...
Page 34: ...1 3 Screen Configuration and Operation 26 ...
Page 138: ...4 5 Setting Application Settings 130 ...
Page 160: ...5 3 Normal Sweep 152 When the setting is Procedure Analyzer Initial Screen Press 2 1 ...
Page 272: ...5 10 Equivalent Circuit Analysis Function 264 ...
Page 336: ...9 4 Deleting a Panel 328 ...
Page 410: ...13 3 About Measurement Times and Measurement Speed 402 ...
Page 418: ...14 4 Discarding the Instrument 410 ...
Page 444: ...Appendix 13 Device Compliance Statement A26 ...
Page 447: ...Index3 Index Vertical Axis Scale 183 Voltage limit 60 78 ...
Page 448: ...Index4 ...
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Page 456: ......
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