Autodelay And Autorange Settings; Resistance Measurement Connections - Keithley 3700A Series Reference Manual

Section 4: Basic DMM operation

Autodelay and autorange settings

The following table provides times for autodelay and autorange time for the Series 3700A DMM
resistance functions.
When measuring resistances that are more than 10 K, cable and Series 3700A card capacitance,
along with dielectric absorption, can cause uncertainties, such as low readings. The low readings are
caused by insufficient settling time after the closure of a Series 3700A switch card channel. Automatic
delays have been optimized to allow proper settling after the close of a channel. See below settling
times. If the application requires an additional settling delay, use the following commands to add
delays to the channel or slot:
channel.setdelay("4004", 0.050)
Adds 50 ms of delay after closing channel 4 in slot 4.
channel.setdelay("slot4", 0.050)
Adds 50 ms of delay to all channels in slot 4.
For continuity, the range is 1 kΩ with an autodelay of 3 ms and autorange of 2.5 ms.
Function
2-wire ohm
and 4-wire
ohm
Dry circuit
ohms

Resistance measurement connections

Analog backplane connector (rear panel)
Connections for resistance measurements are shown below.
For 2-wire resistance measurements, connect the leads to INPUT HI and LO.
4-18
Range and delays
1 to 100 Ω
Range
3 ms
Autodelay
2.5 ms
Autorange
1 to 10 Ω
Range
3 ms
Autodelay
2.5 ms
Autorange
Series 3700A System Switch/Multimeter Reference Manual
1 kΩ 10 kΩ 100 kΩ
3 ms 13 ms 25 ms
2.5 ms 12.5 ms 25 ms
100 to 2 kΩ
13 ms
12.5 ms
1 MΩ 10 MΩ 100 MΩ
100 ms 250 ms 375 ms
100 ms 250 ms 375 ms
3700AS-901-01 Rev. D/June 2018