Dry-Circuit Measurement - Teledyne T3MIL50 User Manual

Dry-Circuit Measurement

Background
Note
Dry Limitations
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
T3MIL50X provides a maximum of up to 20mV in this
mode.
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 6.25V.
The Dry Circuit function cannot be used with the Scan or
Diode functions. In addition, when the Dry Circuit
function is turned on, only 3 drive settings are available:
DC+, DC- and Pulse.
When the Dry Circuit measurement function is turned
on, the measurement range is reduced. See the
specifications for more details.
Range
5mΩ
50mΩ
500mΩ
5Ω
50Ω
500Ω
5kΩ
50kΩ
500kΩ
5MΩ
Dry Mode
✘
✘
✔
✔
✔
✘
✘
✘
✘
✘
MEASUREMENT
Rate
Slow/Fast
Slow/Fast
Slow/Fast
35