Reed Instruments R5001 - Relative Measurement Mode Operation; Factors Affecting Measurement Accuracy; Accuracy Issues in Capacitance Measurement; Accuracy Issues in Inductance Measurement

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Relative Mode
1. ToreservethecurrentDUTreadings(DCUR)ontheprimarydisplay
asareferencevalue(DREF),pressthe button.
2. The ∆ symbol will then appear on the LCD screen indicating this function
is now active. The secondary display will show the percentage of the
relativevalue(REL%).
3. Press the buttonagaintoshowthereferencevalue(DREF)onthe
primarydisplay;the∆symbolwillstarttoblink.
REL%=(DCUR–DREF)/DREFx100%
Note:Thepercentagerangeis-99.9%to99.9%.Whentherelativevalue
islargerthandoublethereferencevalue(DREF),the"OL%"symbolwill
appear on the secondary display.
4. Press and hold down the buttonforapproximately3secondsto
exitrelativemodeandresumenormaloperation.
Accuracy Discrepancies
In some special cases, inaccuracies may occur in the measurement of
capacitive, inductive, and resistive components. This section provides
some recommendations and suggestions to consider.
Capacitance
It is strongly recommended to have the dissipation factor low when measuring
capacitors. Electrolytic capacitors inherently have a higher dissipation factor
due to their normally high internal leakage characteristics. In some cases, if
D(dissipationfactor)isexcessive,measurementaccuracymaydegradeand
even read out of speci cation.
Inductance
Some inductors are intended to operate at a certain DC bias to achieve a
certain inductance value, however this meter cannot produce such a biasing
scheme.Externalbiasingshouldnotbeattemptedbecauseexternalpower
would be applied to the instrument and cause serious damage to the meter.
Therefore, in some cases, the inductance reading may not agree with
manufacturer's speci cation. It is important to check if the speci cation
pertains to DC biasing or not.
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