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Keithley 3700 Series User Manual

Keithley 3700 Series
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Section 8: Theory of operation Series 3700A System Switch/Multimeter Reference Manual
8-16 3700AS-901-01 Rev. D/June 2018
dmm.opendetector open voltage
With dmm.opendetector = dmm.ON, a separate -1.5 A I
OPENLEAD
SHI and a separate SLO current
source will pulse on and off before the start of each measurement while I
SOUR
remains enabled. The
A/D will monitor SHI for 2 ms, then switch to SLO for an additional 2 ms. During either phase, if the
input voltage exceeds the above table, the A/D will stop in less than 100 µs and return an overflow
reading. If there are no open leads detected during the I
OPENLEAD
phase, the I
OPENLEAD
is disabled and
standard 4-wire is enabled.
V
MEAS
with open input:
If Sense HI is disconnected, V
MEAS
will droop less than 1V, causing an A/D overflow.
V
MEAS
with valid connections:
For valid connections, INPUT Sense HI, V
MEAS
, will dip during the 4 ms I
OPENLEAD
phase. The amount
of the voltage dip is the sum of I
OPENLEAD
and the range I
SOUR
and R
DUT
load. For example, if
measuring a 100 on the 100 range, the V
MEAS
across the 100 kΩ will be 0.85 V (10 A to
1.5 µA) × 100 during I
OPENLEAD
and 1 V during measurement phase.
The tables below note timing with dmm.opendetector = dmm.ON.
Range
SHI and SLO
IOPENLEAD
phase (ms)
1
SHI settling
time (ms)
Line frequency
(Hz)
SHI measurement time
(ms)
1-10
4.0
0.5
60
min
max
0.0083
250
50
0.010
240
100
4.0
2.0
60
0.0083
250
50
0.010
240
1
4.0
30.0
60
0.0083
250
50
0.010
240
10 MΩ to
100
4.0
5.0
1
60
0.0083
250
Range
Internal
DMM comm
(ms)
SLO
settling
time (ms)
SLO
measurement
time (ms)
Internal
DMM comm
1 kΩ to
10
0.06
0.5
min
max
0.06
0.0083
250
0.010
240
100
0.06
1.0
0.0083
250
0.06
0.010
240
1
0.06
1.0
0.0083
250
0.06
0.010
240

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Keithley 3700 Series Specifications

General IconGeneral
ModelKeithley 3700 Series
CategoryMultimeter
Number of ChannelsUp to 576 channels
Measurement FunctionsDC Voltage, AC Voltage, DC Current, AC Current, Resistance, Frequency, Temperature, Capacitance
DC Voltage Range300 V
AC Voltage Range300 V
Frequency Range3 Hz to 500 kHz
Temperature RangeVaries with sensor type
Temperature (Thermocouple) TypesJ, K, T, E, R, S, B, N
Capacitance Range1 pF to 100 μF
ConnectivityLAN, USB, GPIB
InterfaceGPIB, Ethernet, USB
Power Supply100 V to 240 V, 50 Hz to 60 Hz
Dimensions8.4 in x 16.8 in x 17.5 in

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