Getting Started 1
Keysight U1251B and U1252B User’s and Service Guide 31
The keypad at a glance
The operation of each key is shown below. Pressing a key illuminates a related
symbol on the display and emits a beep. Turning the rotary switch to another
position resets the current operation of the key.
Figure 1-7 below shows the keypad of the U1252B. The ms% (Pulse width/Duty
cycle), Hz , and frequency counter functions are only available on the
U1252B.
Figure 1-7 U1252B keypad
1
2
3
4
5
6
7
Table 1-2 Keypad descriptions and functions
Button Function when pressed for less than 1 second Function when pressed for more than 1 second
1
acts as a toggle switch to turn backlit ON/OFF.
Backlit automatically turns off after 30s (default)
[a]
.
displays the battery capacity for 3 seconds.
2
freezes the measured value. In Data Hold
mode, press again to trigger hold of the next measured
value. In Refresh Hold mode, reading updates
automatically once reading is stable and count
setting is exceeded
[a]
.
enters Dynamic Recording mode.
Press again to scroll through Max, Min, Avg,
and present readings (indicated by MAXMINAVG on
display).
3
saves displayed value as a reference to be
subtracted from subsequent measurements. Press
again to see the relative value that has been saved.
enters 1 ms Peak Hold mode. Press
to scroll through Max and Min peak readings.
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