Section 4: Using the Model 9100: Capacitance Function 4.13-3
Final Width = 215mm
Note: Internal Compensation
The accuracy of the 9100 Capacitance
Function is maintained by an automatic
process. This compares parameters of
the function against those obtained from
internal voltage and resistance
references of higher stability,
compensating automatically for drift
due to time and temperature.
The compensation process is initiated
only by a change of function into
Capacitance function, and then only
when certain conditions are satisfied:
The process cannot be carried out until
the 9100 has been powered-up for 20
minutes, to avoid reacting to transient
warm-up temperatures; and also:
One of the following three events must
have occurred since the most-recent
compensation:
a. 24 hours has elapsed; or:
b. The temperature, measured
internally, has changed by ±5°C;
or:
c. The Resistance Function has been
externally calibrated.
During the process , a courtesy notice
is placed on the screen to warn users
that the function will not operate
correctly. This is shown in the
representation of the screen on the page
opposite.
4.13.3 Screen Keys
4.13.3.1 Bottom Screen Keys
Indicates that Capacitance function is active. This key has no other
purpose. The default condition accepts constant source currents with
4-wire connections.
CHANGE Scales the analog circuitry to accept alternative constant source currents.
CURRENT Refer to paras 4.13.5.7.
4 WIRE Connects the analog circuitry as a 4-wire source when selected, and a
2-wire source when deselected. Default condition is 'selected'. The
screen key operates as toggle-on / toggle off.
Refer to paras 4.13.5.4 to 4.13.5.6.
∆ Accesses the 'Percentage Deviation' and 'Capacitance Offset' displays
to add to the screen presentation. Refer to paras 4.13.3.3 and 4.13.4.1.
4.13.3.2 Right Side Screen Keys
A. Digit Edit Facility Keys operate on the value marked by the cursor.
X
10 Multiplies the marked value by ten.
÷10 Divides the marked value by ten.
± Inverts the polarity of the marked deviation or offset value.
B. Direct Edit Facility Right side keys operate on the value in the edit box, and
acting in place of the ↵ key, exit from Direct Edit back to
Digit Edit and set the value as evaluated in the box.
i. Output Value and Offset Value
nF Evaluates the number in the box in Nanofarads.
µF Evaluates the number in the box in Microfarads.
mF Evaluates the number in the box in Millifarads.
ii. Deviation Value
% Evaluates the number in the box in Percentage Deviation.
The Deviation value is limited to ±10% of the Output value.
Output and Offset values are set into the same resolution. All values are set into the
highest resolution available to their magnitude.
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