Keithley 3720 User Manual page 87

Series 3700 System Switch/Multimeter User's Manual
Function
ACI
:2 and :4
Continuity
DCV
Temp
Measure count
The Series 3700 supports multi-sample measurements by using the dmm.measurecount ICL
command. For a single ICL trigger, such as print(dmm.measure()), the DMM will take "n"
measurements. This is useful in channel closures or a scanlist where multiple measurements
are required per channel. With a measurecount >1 and autodelay set to once, measurements
can be optimized for accuracy and fast throughput. For example, for a 10-channel scanlist
requiring twenty 10V ACV readings per channel at detectorbandwidth = 3, the measurements
can be optimized as follows:
dmm.func="acvolts"
dmm.range=10
dmm.detectorbandwidth=3
dmm.autodelay=dmm.AUTODELAY_ONCE
dmm.configure.set("myacv")
dmm.setconfig("4001:4010", "myacv")
scan.create("4001:4010")
scan.measurecount=20
buf=dmm.makebuffer(200)
buf.clear()
buf.appendmode=1
scan.execute(buf)
Document Number: 3700S-900-01 Rev. A / August 2007
Range and delays
Ranges
Autodelay
Auto Range
Ranges
1- 100:
Autodelay 3ms
Auto Range 2.5ms
Ranges
Autodelay
Auto Range
RTDs Autodelay 3ms and Auto Range 2.5ms.
T/C Autodelay and Auto Range 1ms.
For the selected sensor type, the appropriate :2 delays will be applied.
Thermistor
Section 5: Basic Digital Multimeter (DMM) Operation
1mA 10mA
200ms 200ms
300ms 300ms
1k: 10k: 100k:
3ms 13ms 25ms
2.5ms 12.5ms 25ms
1k:
3ms
2.5ms
100mA 1A 3A
200ms 200ms 200ms
300ms 300ms 300ms
1M: 10M: 100M:
100ms 150ms 250ms
100ms 150ms 250ms
5-13