Keithley 2701 User Manual

3-32 Basic DMM Operation Model 2701 User’s Manual
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)
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. Press SHIFT and then press CARD.
2. Select CONFIG.
3. Select slot that has the 7701 (i.e., SLOT1: 7701).
4. Select 4W MODE: NORM (normal) or CSID (common-side).
Sense HI
Input HI
Input Lo
Sense Lo
S/W Detection
I-Source
10MΩ
DUT
1mA
-15mV
Open Sense Lo
Lead
OVRFLW
MΩ
2701 Reading
(10MΩ range)
2701
H/W Detection
S/W Detection
Not Used*
Since Sense Hi is not used for the measurement, there is no open
test lead detection for Sense Hi. The Sense Hi test lead does not
need to be connected to the DUT.
*

Keithley 2701 Specifications

General

Brand	Keithley
Model	2701
Category	Multimeter
Language	English