mV
Hz %
mV
)LJXUH)UHTXHQF\'XW\&\FOH0HDVXUHPHQW
I. Measuring Frequency / Duty Cycle
7RPHDVXUHIUHTXHQF\DQGGXW\F\FOHFRQQHFWWKH
0HWHUDV)LJXUHDQGGRWKHIROORZLQJ
,QVHUWWKHUHGWHVWOHDGLQWRWKH
Hz
WHUPLQDODQGWKH
EODFNWHVWOHDGLQWRWKH
COM
WHUPLQDO
6HWWKHURWDU\VZLWFKWRDQGSUHVV
SELECT
EXWWRQWRVH]PHDVXUHPHQWPRGHIRU
IUHTXHQF\PHDVXUHPHQWRUIRUGXW\F\FOH
PHDVXUHPHQW
7KH
SELECT
EXWWRQF\FOHVDPRQJIUHTXHQF\
DQGGXW\F\FOH
&RQQHFWWKHWHVWOHDGVDFURVVZLWKWKHREMHFWEHLQJ
PHDVXUHG
7KHPHDVXUHGYDOXHVKRZVRQWKHSULPDU\GLVSOD\
Note
z
z
7KHUHTXLUHPHQWRI,QSXWDPSOLWXGH³D´LVDVIROORZV
:KHQ+]a0+]P9 D 9UPV
0+]8QVSHFLILHG
:KHQ+]RU'XW\&\FOHPHDVXUHPHQWKDVEHHQ
FRPSOHWHGGLVFRQQHFWWKHFRQQHFWLRQEHWZHHQWKH
WHVWLQJOHDGVDQGWKHFLUFXLWXQGHUWHVWDQGUHPRYH
WKHWHVWOHDGVDZD\IURPWKHLQSXWWHUPLQDOV
Warning
To avoid harms to you, please do not attempt to
input tested frequency voltage higher than 30V rms.
Model DM-442B: OPERATING MANUAL
www.calcert.com
1.800.544.2843
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