MEASUREMENT
37
Dry-Circuit Measurement
Background
The Dry Circuit measurement function is used where the
maximum open-circuit voltage must be kept to a
minimum for applications such as measuring the contact
resistance of switches, relays and connectors. The
GOM-805 provides a maximum of up to 20mV in this
mode.
Note
Dry circuit testing is for switch and connector contact
resistance. Switch and connector contact resistance
measurement is in accordance with DIN IEC 512 and
ASTM B539 which requires that the open circuit voltage
of the measuring device should not exceed 20mV DC.
Voltage at such low levels avoids the breakdown of any
oxides that may be present on the contacts. In this mode
the open circuit measuring voltage is limited <20mV,
while modes like DC+ or pulse mode can have an open
circuit measuring voltage as high as 6.5V.
Dry Limitations
When the Dry Circuit measurement function is turned
on, the measurement range is reduced. See the
specifications for more details.
Range
Dry Mode
Rate
50mΩ
✘
500mΩ
✔
Slow/Fast
5Ω
✔
Slow/Fast
50Ω
✔
Slow/Fast
500Ω
✘
5kΩ
✘
50kΩ
✘
500kΩ
✘
5MΩ
✘
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