UNI-T UT30B Operating Manual page 28

10. Frequency Measurement (Only for UT30F)(see figure 11)
1) Do not input voltage over 230V RMS to
avoid damages to the meter.
2) The LCD will display reading when the
measured frequency is more than 10V,
but the read out may exceed specification.
To obtain an accurate, stable reading, an
external attenuator should be used.
3) To measure high frequency signal in high
interferenced environment use shielded
cable.
Model UT30B/C/D/F: OPERATING MANUAL
G.Make Measurements(12)
28
(figure11)