4-Wire Common-Side (Csid) Ohms Measurements (7701 Module) - Keithley 2701 User Manual

3-32 Basic DMM Operation
10MΩ and 100MΩ ranges – Open sense lead detection for the 10MΩ and 100MΩ detection
is slightly different and is shown in Figure 3-13. Detection is performed at Sense Lo only.
Sense Hi is not used. It does not need to be connected to the DUT. When the Sense Lo lead
opens, the Sense Lo terminal will drift to -15mV and trip the "OVRFLOW" message.
Figure 3-13
Open Sense Lo lead detection (10MΩ and 100MΩ ranges)
DUT
Open Sense Lo

4-wire common-side (CSID) ohms measurements (7701 module)

For normal 4-wire ohms measurements using a switching module, channels are paired to
provide the switch paths for input and sense. Each tested DUT requires two input
channels. For example, the 7700 module has 20 channels. With the Ω4 function selected,
channel 1 is paired to channel 11, channel 2 is paired to channel 12, and so on. This
configuration allows up to 10 DUT to be tested.
The 7701 module has 32 input channels. For normal 4-wire ohms measurements, up to 16
DUT can be tested. However, this module can be configured for common-side (CSID)
4-wire ohms measurements, allowing up to 32 DUT to be tested.
With a 7701 module installed, the 4-wire ohms mode can be selected using the following
key-press sequence:
1.
2.
3.
4.
Sense HI
Input HI
1mA
10MΩ
Input Lo
Sense Lo
Since Sense Hi is not used for the measurement, there is no open
*
Lead test lead detection for Sense Hi. The Sense Hi test lead does not
need to be connected to the DUT.
Press SHIFT and then press CARD.
Select CONFIG.
Select slot that has the 7701 (i.e., SLOT1: 7701).
Select 4W MODE: NORM (normal) or CSID (common-side).
Not Used*
H/W Detection
S/W Detection
I-Source
S/W Detection -15mV
Model 2701 User's Manual
2701
MΩ
OVRFLW
2701 Reading
(10MΩ range)