Specifications

C-7 Measuring Frequency
1) Connect red test lead to “Hz” jack and black
test lead to “COM” jack.
2) Set the rotary switch to “kHz”
3) Connect the test leads across with the object
being measured. LCD appears the frequency
value.
Caution
When measuring above 30Vrms, accuracy could
not be guaranteed and take extra care of safety
as voltage brings dangerous electricity .
C-8 Measuring Diode and Continuity beeper
1) Connect the black test lead to “COM” jack
and red test lead to “VΩ ” jack (Red test lead
polarity is "+")
2) Set the rotary switch to “ ”
3) Connect the test lead across with the object
being measured.The reading is Diode Forward
Voltage Drop Nearest Value.
4) Connect the test lead to object’s two points
being measured, the beeper sounds if the
resistant value between the two points is
below 30Ω.
C-9 DATA-Hold
1) Press DATA-H to enter and exit the hold mode
2) It is not necessarily to connect the test lead.
Model UT57: OPERATING MANUAL
14