Promax MZ-805 Manual De Instrucciones página 69

MZ-805 L/C/R meter
Bias
This applies 2 Volts DC across the test terminals to polarise electrolytic
capacitors according to the polarity marked on the Kelvin connectors. Note that
applying bias to resistors or inductors may cause a measurement error because
of internal overload. Bias voltages up to 50V DC can be applied externally, see
the External Bias section of the Measurement Principles chapter.
Zero C
When measuring capacitors, pressing this button prior to inserting the
component under test zeroes the capacitance reading thereby eliminating the
capacitance of the test jig. Up to 100pF of stray capacitance may be zeroed out
in this way. The correction factor is lost when the bridge is turned off. Zero C
can only be used when capacitance is being measured; if any other function is
selected the display will show not C for 2 seconds and the command will be
ignored.
R+Q, L+Q, C+D, C+R
Sets the instrument to show the major parameter in the left—hand display
and the corresponding minor parameter on the right.
Auto
In Auto mode the instrument automatically detects whether the
component being measured is a resistor, capacitor or inductor and sets the
instrument to display the parameters of the test component automatically. Note
that 'imperfect' components, e.g. inductors with a high series resistance, may
be incorrectly detected in Auto mode and will need to have the correct function
set manually. In Auto mode the measurement frequency can be changed (by
pressing the Freq key) but the Series/Parallel mode selection is held at the
default selection for that component type, see Measurement Principles section.
To change from series to parallel mode, or vice-versa, it is first necessary to exit
Auto mode by selecting the appropriate function (R+Q, L+Q, etc.); the mode
can then be changed with the Mode key.
Range Hold
Holds the measurement range at that in use when the button is pressed.
This disables the auto—ranging and minimises the settling time between
measurements of similar value components.
August 2002 Page 15