45
Service Manual
1-6
The term "pca" is used to represent a printed circuit assembly and its
attached parts.
• Signal Logic Polarity
On schematic diagrams, a signal name followed by a "*" is active (or
asserted) low. Signals not so marked are active high.
• Circuit Nodes
Individual pins or connections on a component are specified with a dash (-)
following the component reference designator. For example, pin 19 of U30
would be U30-19.
• User Notation
For front panel operation,
XXX An uppercase word or symbol without parentheses indicates a button
to be pressed by the user. Buttons can be pressed in four ways:
1. Press a single button to select a function or operation.
2. Press a combination of buttons, one after the other.
3. Press and hold down a button, then press another button.
4. Press multiple buttons simultaneously.
For computer interface operation,
XXX An uppercase word without parentheses identifies a command
by name.
<XXX> Angle brackets around all uppercase letters mean press
the<XXX> key.
(xxx) When associated with a keyword, a lowercase word in
parentheses indicates an input required by the user.
1-6. Specifications
The following contains the specifications for the Fluke 45 Dual Display Multimeter.
These specifications assume:
• A 1-year calibration cycle
• An operating temperature of 18 to 28ºC
• Relative humidity not exceeding 90% (non-condensing)
Accuracy is expressed as ±(percentage of reading + counts).
Reading Rates and Display Counts
Rate Readings per Second Full Range Display Counts
Slow
Medium
Fast
2.5
5
20
99,999*
30,000
3,000
* Ohms full range will typically be 98,000 counts
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