Getting Started 1
U1253B User’s and Service Guide 25
Selecting display with the Hz button
The frequency measurement function is able to detect the
presence of harmonic currents in neutral conductors and
determine whether these neutral currents are the result of
unbalanced phases or non- linear loads.
• Press to enter 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 be
displayed on the primary display by pressing again.
This allows simultaneous monitoring of real- time voltage
or current with frequency, duty cycle, or pulse width.
• Hold
for more than 1 second to resume voltage or
current reading on the primary display.
Table 1-9 Selecting display with the Hz button
Rotary switch position (Function) Primary display Secondary display
(For , press to select AC
voltage)
Frequency (Hz)
AC V
Pulse width (ms)
Duty cycle (%)
(Default is DC voltage)
Frequency (Hz)
DC VPulse width (ms)
Duty cycle (%)
(Press twice to select AC+DC voltage)
Frequency (Hz)
AC+DC VPulse width (ms)
Duty cycle (%)
(Default is DC voltage)
Frequency (Hz)
DC mVPulse width (ms)
Duty cycle (%)
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