Fluke 15B - Battery Saver; Making Measurements; Manual Ranging and Auto Ranging; Data Hold

15B & 17B
Users Manual
6
Battery Saver
The Meter enters the “Sleep mode” and blanks the display
if the Meter is not used and the input is inactive for 30
minutes. Press any button or turn the rotary switch to
wake the Meter up. To disable the Sleep mode, hold down
the YELLOW button while turning the Meter on.
Making Measurements
Manual Ranging and Auto Ranging
The Meter has both manual and auto range options. In the
auto range mode, the Meter selects the best range for the
input detected. This allows you to switch test points
without having to reset the range. You can override auto
ranging by selecting the range manually.
The Meter defaults to the auto range mode in
measurement functions that have more than one range.
When the Meter is in the auto range mode, Auto Range is
displayed.
To enter and exit the manual range mode:
1. Press
.
Each press of  increments the range. When the
highest range is reached, the Meter wraps to the
lowest range.
2. To exit the manual range mode, press and hold 
for two seconds.
Data Hold
XWWarning
Dangerous voltages may be present at the
input terminals and may not be displayed.
To hold the present reading, press . Press  again
to resume normal operation.
Relative Measurements (17B only)
The Meter will display relative measurements in all
functions except frequency.
1. With the Meter in the desired function, touch the test
leads to the circuit on which you want future
measurements to be based.
2. Press
 to store the measured value as the
reference value and activate the relative
measurement mode. The difference between the
reference value and subsequent reading is displayed.
3. Press
 for more than 2 seconds to return the
Meter to normal operation.
Measuring AC and DC Voltage
To minimize improper reading of an unknown voltage
containing either ac or ac + dc voltage components, first
select the ac voltage function on the meter making
particular note of the ac range required for a good
measurement. Next manually select the dc function with
the dc range that either matches or is higher than the
previously noted ac range. Using this procedure minimizes