GW Instek GOM-805 - Select Resistance Range

MEASUREMENT
31
Measuring Signal (Drive) Overview
Background
Resistance measurement has 5 different measuring signals
that can be applied to obtain a resistance measurement:
DC+, DC-, Pulse, PWM, Zero.
These 5 signals are described in below.
Note
The drive function is only applicable to the GOM-805.
The drive signal for the GOM-804 is fixed to DC+.
DC+
~ +6.5V
Open circuit
voltage
0V
V
t
Default drive
signal.
DC-
~ -6.5V
Open circuit
voltage
0V
V
t
Negative drive
signal.
Pulse
~-6.5V
0V
V
t
~+6.5V
50ms
50ms
This mode can be used to
eliminate the thermoelectric
EMF formed on the contact
between a test lead and a
DUT.
PWM
0V
V
t
~+6.5V
ON duty
This mode can be used to
avoid heating up the DUT
and thus avoid having the
measurement accuracy
compromised on
temperature-sensitive DUTs.
Zero
0V
V
t
In this mode, GOM-805
outputs no measuring signal
on the Source loop; therefore,
the Sense loop can be used as
a voltage meter which can
measure up to +/-10mV for
thermoelectric EMF
measurement. This function
is useful for measuring the
Vemf of thermocouple wires.
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