Fluke 287 Fluke 287 and 289 Multimeter Users Manual - Page 36

Measuring AC and DC Signals, AC over DC, AC + DC

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287/289 Users Manual Measuring AC and DC Signals The Meter is capable of displaying both ac and dc signal components (voltage or current) as two separate readings or one AC+DC (rms) value combined. As shown in Figure 13, the Meter displays ac and dc combinations three ways: ac displayed over dc (AC,DC), dc displayed over ac (DC,AC), and ac combined with dc (AC+DC). Select one of these three displays using the Function and Mode menu. With the rotary switch set to U, N, A, or X, press the softkey labeled Menu. Move the menu selector to the menu item labeled AC+DC. At this point, three different softkey labels indicate AC+DC (F1), AC,DC (F2), and DC,AC (F3). Press the softkey that presents these two signals as needed. While in any of the three AC+DC modes, peak measurements, frequency, duty cycle, and period measurements are not allowed. In addition to these modes, MIN MAX, relative, and relative % are not allowed in AC,DC or DC,AC modes. Note The bar graph is not displayed while the Meter is in any of the three AC+DC modes. AC over DC 8:10pm 06/13/07 DC over AC 8:10pm 06/13/07 8:10pm AC + DC 06/13/07 123.45 VAC Auto Range 500 VAC 23.45 VDC 23.45 VDC Auto Range 500 V 123.45VAC 125.66 V AC + DC Auto Range 500 V 23.45 VDC Menu Save Setup Menu Save Setup Menu Save Setup Figure 13. AC and DC Display est30.eps Both manual and autoranging is available when using the ac+dc modes. The same range is used for both ac and dc signals. However, while in autorange, up-ranging occurs when either the ac or dc signal exceeds the present range. Down-ranging occurs 26

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287/289
Users Manual
26
Measuring AC and DC Signals
The Meter is capable of displaying both ac and dc signal
components (voltage or current) as two separate readings or one
AC+DC (rms) value combined. As shown in Figure 13, the Meter
displays ac and dc combinations three ways: ac displayed over
dc (AC,DC), dc displayed over ac (DC,AC), and ac combined
with dc (AC+DC). Select one of these three displays using the
Function and Mode menu.
With the rotary switch set to
U
,
N
,
A
, or
X
, press the
softkey labeled
Menu
. Move the menu selector to the menu item
labeled
AC+DC
. At this point, three different softkey labels
indicate
AC+DC
(F1),
AC,DC
(F2), and
DC,AC
(F3). Press the
softkey that presents these two signals as needed.
While in any of the three AC+DC modes, peak measurements,
frequency, duty cycle, and period measurements are not
allowed. In addition to these modes, MIN MAX, relative, and
relative % are not allowed in AC,DC or DC,AC modes.
Note
The bar graph is not displayed while the Meter is in
any of the three AC+DC modes.
Menu
123.45
VAC
AC over DC
DC over AC
AC + DC
VDC
23.45
Save
Setup
Auto Range
500 VAC
Menu
125.66
V
VDC
23.45
Save
Setup
AC + DC
500 V
Menu
23.45
VDC
VAC
123.45
Save
Setup
Auto Range
500 V
Auto Range
8:10pm
06/13/07
8:10pm
06/13/07
8:10pm
06/13/07
est30.eps
Figure 13. AC and DC Display
Both manual and autoranging is available when using the ac+dc
modes. The same range is used for both ac and dc signals.
However, while in autorange, up-ranging occurs when either the
ac or dc signal exceeds the present range. Down-ranging occurs