Full Product Manual

17
Resistance
When measuring resistance of devices, it is important to know that there are
two types or ways of measurement. One type is DC resistance measurement.
Another type is AC resistance measurement. The LCR meter provides both
types of measurement.
Before using the meter to measure resistance, please verify whether
the DUT (device under test) requires DC or AC resistance measurement
method. Depending on the method, results will vary greatly.
Guard Terminal
One of the input sockets and terminals is labeled as "GUARD". This
terminal does not have to be used in all instances for the meter to provide
measurements. But in some instances, it is very useful. Guard terminal
generally serves two purposes.
If user is using test leads, the guard terminal can be used to connect to
the shielding of the test leads. Doing so can be useful when making large
resistive component measurements. For example, when measuring a 10
MΩ resistor with test leads, at the high range the reading may seem to be
unstable as a few digits may continuously be changing. Having the shield
of the test leads connected to the guard terminal will help stabilize the
reading in some instances.
Guard terminal is also used to minimize noise and to help minimize parasitic
effects coming from the component being measured, thus allowing high
precision results.
Calibration Mode
It is recommended to regularly calibrate this meter to improve the accuracy
of high/low impedance measurements.
Note: You will need a shorting bar or a short piece of conductive metal
(i.e. paper clip) to complete the calibration procedure.
1. Be sure nothing is connected to the meter, and turn it on.
2. Press and hold down the CAL button for 2 seconds to enter
calibration mode.
3. The screen will display "OPEN", indicating the input terminals have
nothing connected.
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REED Instruments
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