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3.3 Measurement Parameters, Result
Displays, and Outputs
3.3.1 Parameters (R/Q,L/Q,
C/D,C/R,R/X,G/B,Z/ANG,Y/ANG)
Automatic Selection. The Digibridge as powered up
provides you with automatic selection of parameters
(unless keyboard has been locked with a particular
parameter selected.
This feature enables you to measure any passive
component (without knowing whether it is essentially
a resistor, inductor or capacitor). It is provided at
power-up and remains enabled as long as you do NOT
select any particular parameter.
Automatic parameter selection can be disabled by
pressing any parameter key, such as the [C/D] key, for
example. Once disabled, this feature can be enabled
again by selecting the ENTER function and then
pressing these keys:
[1][=][SHIFT][SPECIAL][7]
To select parameter automatically, the Digibridge
calculates Q; if |Q| < 0.125, R is selected, otherwise,
for positive Q, L is selected and for negative Q, C is
selected. (The sign of Q is the same as the sign of
the reactive component of impedance.)
Manual Selection: To select the parameter to be
measured manually:
[R/Q, L/Q, C/D, C/R]
1. Press one of the 4 parameter keys:
[SHIFT][R/X, G/B, Z/ANG, Y/ANG]
or
The LEDs above the display will indicate which
parameter is selected.
2. Use the [EQUIVALENT CIRCUIT] key to
select SERIES or PARALLEL. See Table
3-4.
Operation
Key
Series
Parallel
Rs/Q
Rp/Q
R/Q
Ls/Q
Lp/Q
L/Q
Cs/D
Cp/D
C/D
Cs/Rs
Cp/Rp
C/R
Rs/Xs
*
R/X
*
Gp/Bp
G/B
*
*
Z/ANG
*
*
Y/Ang
*Equivalent circuits are discussed below in paragraph
3.3.2.
Table 3-4: Selecting Measurement Parameter
For an inductor select L/Q; for a capacitor, either C/D
or C/R; for a resistor, R/Q. There will be a immediate
confirmation on the display panel, where appropriate
parameter and unit indicators will be lit. (However,
do not attempt to select the unit multiplier.) The
Digibridge will automatically switch to the appropri-
ate multiplier - from µF to pF for example - , unless
RANGE is HELD, when it makes a measurement. The
result will be displayed in terms of the parameters and
equivalent circuit that you select, (even if the DUT
has the opposite kind of reactance - see below).
Note: Observing the results displays can be helpful in
deciding whether you have made the best parameter
selection. (See below.) Displays are discussed further
in paragraph.
Negative RLC. If RLC is negative with an L or C
value displayed, the DUT reactance is opposite to
the selected parameter. As a rule, you should change
parameter (usually select L instead of C or vice versa)
so that a positive L or C value display can be obtained.
However, the displayed negative value of L or C is
mathematically correct and (without the minus sign)
is in fact the value that will resonate with the DUT
at the test frequency.
1693 RLC Digibridge
Parameter
Units
Measured
Resistance/
Ohms/
Quality
none
Inductance/
Henries/
Quality
none
Capacitance/
Farads/
Dissipation
none
Capacitance/
Farads/
Resistance
Ohms
Resistance/
Ohms/
Reactance
Ohms
Conductance/
Siemens/
Susceptance
Siemens
Impedance/
Ohms/
Angle
Degrees
Admittance/
Siemens/
Angle
Degrees
33
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