Section 4: Using the Model 9100: AC Current Function 4.6-9
Final Width = 215mm
4.6.5.1 AC Current Resolution Thresholds
The different current resolutions are distinguished by two characteristics:
• Maximum and minimum values available.
• Absolute resolution of the least-significant digit.
The following table shows the spans of output values in the AC Current function, for
'sinusoidal waveshape only, against their associated resolutions.
4.6.5 Crossing Thresholds
Absolute Span of Values (RMS) Nominal
Resolution Span Value
1nA 000.000 µA to 320.000 µA 300µA
10nA 0.00000 mA to 3.20000 mA 3mA
100nA 00.0000 mA to 32.0000 mA 30mA
1µA 000.000 mA to 320.000 mA 300mA
1µA 0.00000 A to 3.20000 A 3A
10µA 00.0000 A to 20.0000 A 10A
Rules, built into firmware, govern passage across thresholds between resolutions.
Increasing Output Current
Using the
key in Digit Edit facility; an audible warning will be given if the new value
is too large for the present span of values, with a reminder ('Up range required') on the
screen. The user must change to the next lower resolution, with a larger span of values,
using the
key. This rule applies whether OUTPUT is OFF or ON.
When using either the X10 screen key or the Direct Edit facility; if the new value is too
large for the present resolution, a lower resolution will be activated with a larger span of
values. No warning will be given. This rule applies whether OUTPUT is OFF or ON.
Decreasing Output Current
Using Digit Edit; values down to zero lie within all spans. An attempt to set a negative
value will not be enabled, and an audible warning will be given, accompanied by a
reminder ('
Minimum value') on the screen. If the required value lies between steps of the
present resolution, the user must increase resolution using the
key, also reducing
the span of values. This rule applies whether OUTPUT is OFF or ON.
Using either the ÷10 screen key or Direct Editing; if the required value lies between
increments of the present resolution, a greater resolution will be activated with reduced
span. No warning will be given. This rule applies whether OUTPUT is OFF or ON.
'Out of range'
Refer to Sub-section 4.6.7.
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