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Model 187 & 189
Users Manual
2-8
Table 2-2. Pushbuttons
Button Description
Yellow Button
Function Description
Note
Press O to access “Yellow Button Functions.” The O box and the 24-hour clock appear in the lower corners
of the display and the primary display freezes, allowing time to press a second button.
T
l
Press to turn backlight on or off. Also, in Setup, use
the arrow function (l) to select the previous digit or
item in a list.
SETUP
O T
Press to access Setup selections.
Press to store a Setup selection and
proceed to the next selection.
Q Press to freeze the displayed value. Press again to
release the display.
AutoHOLD
O Q
Press to begin AutoHOLD; the last
stable reading is displayed.
M Press to start retaining min, max, and average values.
Press successively to display max, min, and average
values. Press O N (CANCEL) to stop.
FAST MN MX
O M
Press to start FAST MN MX mode,
where min and max values for short
duration events are stored.
D Press to store the present reading as an offset
reference; subsequent readings show only the relative
difference from this value. Press again to show the
difference as a percentage of the reference.
LOGGING
O D
Press to start and stop Logging
(Model 189). Press O + N
(CANCEL) to stop.