FLUKE-287 CALIBRATED Fluke, FLUKE-287 CALIBRATED Datasheet - Page 33

• Manufacturer Part Number: FLUKE-287 CALIBRATED
• Description: MULTIMETER, DIGITAL, HANDHELD
• Manufacturer: Fluke

Specifications of FLUKE-287 CALIBRATED

• Dmm Type: Handheld
• Voltage Measuring Range Dc: 50 MV To 50 V
• Voltage Measuring Range Ac: 500 V To 1000 V
• Current Measuring Range Dc: 500µA To 10A
• Current Measuring Range Ac: 500µA To 10A
• Lead Free Status / RoHS Status: na

Using LoZ for Voltage Measurements (Model
289 only)
To eliminate ghost voltages, the Meter’s LoZ function presents a
low impedance across the leads to obtain a more accurate
measurement.
To make a LoZ measurement, set the rotary switch to L. The
Meter displays the ac voltage in the primary display and the dc
voltage in the secondary display. During LoZ measurements, the
Meter’s range is set to 1000 volts in the manual ranging mode.
In LoZ, both R and M are disabled. There are no additional
modes for this function and the softkey labeled Menu is therefore
disabled as well.
Making dB Measurements
The Meter is capable of displaying voltage as a dB value, either
relative to 1 milliwatt (dBm), a reference voltage of 1 volt (dBV)
or a user-selectable reference value. See the “Setting a Custom
dBm Reference” section later in this manual.
Do not use the LoZ mode to measure voltages in
circuits that could be damaged by this mode’s low
impedance ( 3 k ).
W Caution
To set the Meter to display values in dBm, set the rotary switch
to V or T and press the softkey labeled Menu. Move the menu
selector to the menu item labeled dBm. Press the softkey
labeled dBm. The dBm, Hz menu selection replaces the
secondary display (123.45 VAC in Figure 11) with the frequency
measurement. All voltage measurements are displayed as a
dBm value, as shown in Figure 11.
A dBm measurement must use a reference impedance
(resistance) to calculate a dB value based on 1 milliwatt. When
set to 600
during a dBm measurement. When set to something other than
600 , the reference impedance is displayed just above the
softkey labels.
0
Menu
8:10pm
(default), the reference impedance is not displayed
100
41.83
Figure 11. dBm Display
Save
200
123.45
300
1000
Ref
Making Measurements
400
Reference
dBm
VAC
Auto Range
06/13/07
Setup
500 VAC
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