Fluke 45 User Manual
45
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.
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
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,
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.
(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.
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
(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
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.)
Table 5-l5 in Chapter 5.)