Fluke 45 user manual Selecting a Measurement Rate Rate, Using the SButton

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Users Manual

Hold, then converts the measurement to decibels, then determines if the measurement is either a new minimum or maximum value, and then subtracts the relative base from the measurement.

When using multiple modifiers, the order in which modifiers are selected is important. For example, if Kis pressed when you are in the MN MX, either the minimum or maximum value (which ever is currently displayed) becomes the relative base. Pressing

Jagain as the next action causes the meter to display the difference between the minimum and maximum value. If, on the other hand, Jis pressed when you are in REL, the difference between the relative base and the minimum or maximum value (depending on what was displayed) is shown.

Selecting A Measurement Rate (Rate)

The meter takes measurements at one of three, user-selectable rates: slow, medium, and fast. Rate selection allows you to maximize either measurement speed or noise rejection, which affects accuracy (see Table 3-9). The rate selected is indicated by "S." "M," "F" (slow, medium, or fast, respectively) in the primary display.

Press R, located in the lower-right corner of the front panel, to step through measurement rates. The selected rate applies to all basic measurements, except frequency. (When frequency is measured, the rate is a factor of the frequency being measured (see Table 3-6), and pressing Rhas no effect on the frequency update rate.)

Table 3-9. Display Measurement Rates for Single Function Measurements

Measurement Rate

Digits

Display Counts

Results Per Second

Slow	5	99,999*	2-1/2
Medium	4-1/2	30,000	5
Fast	3-1/2	3,000	20

* All ranges and functions except ohms will display up to 99999. Ohms displays up to 98000 (typical).

Using the SButton

Pressing S(located on the lower-right of the front panel) causes the next button pushed to perform a second level operation.

A second level operation can be selected by:

•Pressing Sthen pressing another button (or buttons);

•Pressing and holding down Sand pressing another button;

The second level operation available on a pushbutton is engraved below it on the front panel and enclosed in parentheses in Table 3-10. (The LOCAL function associated with

Soperates only when the meter is in REMS [remote without front panel lockout]. See Table 5-l5 in Chapter 5.)

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