Keysight U1252B - Selecting Display with the Hz Button

Getting Started 1
Keysight U1251B and U1252B User’s and Service Guide 39
Selecting display with the Hz button
The frequency measurement feature helps to detect the presence of harmonic
currents in neutral conductors and determines whether these neutral currents are
the result of unbalanced phases or non-linear loads. Press to access the
frequency measurement mode for current or voltage measurements — voltage or
current on the secondary display and frequency on the primary display.
Alternatively, pulse width (ms) or duty cycle (%) can appear on the primary
display by pressing again. This enables the simultaneous monitoring of
real-time voltage and current, with frequency, duty cycle or pulse width. Voltage
or current measurement resumes on the primary display after you press and hold
for more than 1 second.
Table 1-7 Selecting display with the Hz button
Rotary switch position (function) Primary display Secondary display
for U1252B
(AC voltage)
Frequency (Hz)
AC VPulse width (ms)
Duty cycle (%)
for U1251B
for U1252B
(DC voltage)
Frequency (Hz)
DC VPulse width (ms)
Duty cycle (%)
for U1252B
(AC + DC voltage)
Frequency (Hz)
AC + DC VPulse width (ms)
Duty cycle (%)
(AC voltage)
Frequency (Hz)
AC mV Pulse width (ms)
Duty cycle (%)
(DC voltage)
Frequency (Hz)
DC mV Pulse width (ms)
Duty cycle (%)