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Users Manual

3-14

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 K is pressed when you are in the MN MX, either the minimum or

maximum value (which ever is currently displayed) becomes the relative base. Pressing

J again as the next action causes the meter to display the difference between the

minimum and maximum value. If, on the other hand, J is 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 R has 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 S Button

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 S then pressing another button (or buttons);

• Pressing and holding down S and 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

S operates only when the meter is in REMS [remote without front panel lockout]. See

Table 5-l5 in Chapter 5.)

Fluke 45 User Manual

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