Section 4: Basic DMM operation
Series 3700A System Switch/Multimeter Reference Manual
4-18
3700AS-901-01 Rev. D/June 2018
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
Range and delays
2-wire ohm
and 4-wire
ohm
Range
1 to 100
Ω 1 kΩ
10
kΩ
100
kΩ
1
MΩ
10
MΩ
100
MΩ
Autodelay
3 ms
3 ms
13 ms
25 ms
100 ms
250 ms
375 ms
Autorange
2.5 ms
2.5 ms
12.5 ms
25 ms
100 ms
250 ms
375 ms
Dry circuit
ohms
Range
1 to 10
Ω
100 to 2
kΩ
Autodelay
3 ms
13 ms
Autorange
2.5 ms
12.5 ms
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.
