35
Subject to change without notice
Deviation DEV_S:
The display of the percentage or absolute (ABS) deviation of
the measured second value from the reference value REF_S
can be turned on/off.
Reference REF_S:
The measured value of the loss factor or the quality factor Q can
be entered into the reference memory S. The following units are
allowed: Ω, mΩ, kΩ, MΩ, S, kS, mS, μS, nS, pS oder °.
As long as this fi eld is open, the actual measured value of
the DUT may be set as the reference by pressing the button
TRIG/UNIT
27
Constant voltage CST V
Here the constant voltage may be turned on/off. If constant
voltage is selected the source impedance will be set to 25 Ω
irrespective of the range. The constant voltage must be turned
on for any measurements with BIAS current or external BIAS
voltage.
Menufunction CORR
The submenu of CORR allows the selection of:
Calibration OPEN
Here the open circuit calibration can be turned on/off.
Calibration SHORT
Here the calibration with shorted terminals can be turned
on/off.
Calibration LOAD
Here the calibration with a known load impedance can be turned
on/off. For any measurements with load impedance calibration
the desired function must be selected manually by pressing of
the buttons
28
...
39
).
NUM:
Here a load impedance LOAD from 0 to 5 available ones may
be selected
Frequency FRQ:
Here the measuring frequency of the load impedance LOAD
may be selected from 20 Hz to 200 KHz.
Function FUNC:
Here the reference values for the load impedances LOADM and
LOADS can be selected. The following functions are available:
Ls-Q, Lp-Q, Ls-Rs, Lp-Rp, Cs-D, Cp-D, Cs-Rs, Cp-Rp, Rs-Q,
Rp-Q, Z-Θ,Y-Θ, R-X, G-B
Reference value LOADM for the main measurement value
Here a measurement result may be stored in memory LOADM as
the reference value for the load impedance LOAD. The available
units are, depending on the parameter FUNC: H, mH, μH, nH, F,
mF, μF, nF, pF, Ω, mΩ, kΩ, MΩ, or S, kS, mS, μS, nS, pS
Reference value LOADS for the second measurement value
Here a measurement result may be stored in memory LOADS
as the reference for the load impedance LOAD. The available
units are, depending on the function FUNC: Ω, mΩ, kΩ, MΩ,
S, kS, mS, μS, nS, pS or °.
Please note:
When using the calibration with a load, values must
be entered in both reference memories (e.g. if an
ohmic resistance is used for LOADM its value will
be stored in LOADM , and „0“ in LOADS.)
The parameters LOADM and LOADS can be used if it is diffi cult
to calibrate a test fi xture or if it is connected via long leads. In
such case it is not possible to realize a full open/short calibration
because the actual circuit of the fi xture can not be compensated
by the standard circuit provided in the LCR bridge; the bridge
remains hence in an uncalibrated state. By using a known im-
pedance at the measuring frequency the user can compensate
for the resulting measurement error.
If the calibration with a known load (LOAD) is activated, the
bridge will correct the measurement result of the unknown
impedance connected by referring to three references: the
open-circuit impedance, the short-circuit impedance and the
known impedance. The user may store up to 5 different refe-
rence values for the load impedance which can be selected using
FUNC. One impedance always requires a set of parameters: a
numerical value, a frequency, a function in addition to its own
parameters.
The user is free to choose the function which is most suitable
for his measurement (e.g. Cs – D for a capacitor or R – Q for a
resistor). Using a load impedance reference is most effective
if the impedance chosen is close to the actual impedance of
the unknown. If the calibration with a load (LOAD) is turned on
(parameter LOAD turned „on“) the „load impedance correction“
is automatically activated, if the measuring frequency selected
is identical to any of the frequencies stored in any of the up to 5
LOAD impedance parameter sets. It is hence advisable to store
different measuring frequencies.
Menufunction SYST
The submenu of SYST allows the selection of:
CONTRAST
Here the LCD display contrast may be chosen between 35 to
55.
First-time operation
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