Fluke 9100 - Page 288

4.18-4 Section 4: Using the Model 9100: Insulation/Continuity Function (Option 135)
4.18.3 Screen Keys
4.18.3.1 Bottom Screen Keys
Ω
Selects the Continuity function. This defaults to 4-wire
continuity mode, which is not selectable by the user. The Continuity
function is permanently connected in 4-wire mode, for the following
reasons:
1. The resistances measured by continuity meters are typically very
low (a few ohms or less)
2. The current used to measure these resistances is relatively high
(typically at least 200mA). Voltage drops across the test leads and
the instrument's internal resistance would therefore be significant
and would produce relatively large measurement errors
Ω
Selects the Insulation function. This is the default function
when the Insulation/Continuity option is selected. The user can toggle
between Insulation and Continuity functions using the two softkeys
along the bottom of the screen.
Scales the internal high voltage active impedance circuitry
to accept alternative input currents on a given impedance value. See
Section 4.18.7.2 for a more detailed description of this function.
The delta key provides access to the ‘Percentage Deviation’
and ‘Resistance Offset’ displays to adjust the absolute value of output
impedance. These fields operate in the same manner as for the existing
active ohms circuit, and the user is encouraged to refer to Section
4.7.3.3 and 4.7.4.1 for a more detailed explanation.
CHANGE
CURRENT
∆