True-rms Thermal Multimeter
Basic Measurements
19
Volts/Hertz Ratio
The Multimeter can show the ratio of volts to frequency of the
ac signal. See Figure 6.
When the Multimeter is set to the Volts/Hz function, the voltage
range is set to manual. If the voltage increases to a value
larger than the range, the Multimeter shows
OL in the display.
If the voltage drops to less than 5 % of the range, the value
shown in the display can be invalid.
Low-Pass Filter
AC measurements use an ac low-pass filter (). The filter
blocks unwanted voltages above 1 kHz. See Figure 5. The
lower frequency voltages pass with reduced accuracy to the
measurement below 1 kHz. The low-pass filter can improve
measurement performance on composite sine waves that are
typically generated by inverters and variable frequency motor
drives.
Figure 5. Low-Pass Filter
Figure 6. Volt/Hertz Ratio
1 kHz
100 Hz
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