Keithley 2790, User Manual

Page: 115 / 130

HW 11/04/03
Rev. D
2790 SourceMeter

Switch System Specifications
7751/7752/7753 SOURCE/SWITCH MODULE SPECIFICATIONS
2790 Resistance Mode Specifications with Cards
2,3
(Module function accuracy specifications are for 2 years,
23°C, ±5°C)
Source
Current
Maximum
Resistance
Typ. Open
Ckt.
Voltage
Accuracy
%Rdg + Ohms
Temperature Coefficient
(0-18°C & 28-40°C)
50mA
20
Ω 5.5V
0.09% + 40m
Ω
(0.002%+3m
Ω
)/°C
20mA
50
Ω 5.5V
0.11% + 40m
Ω
(0.003%+3m
Ω
)/°C
10mA
100
Ω 5.5V
0.16% + 40m
Ω
(0.004%+3m
Ω
)/°C
(Dry Circuit Ohms 1mA max with 7751, 7752, or 7753 card)
1mA
10
Ω 20mV
1.10% + 40m
Ω
(0.026%+3m
Ω
)/°C
(7751 Only)
Source
Voltage
Resistance
Range
Max.
Short Ckt.
Current
Accuracy
%Rdg
Temperature
Coefficient
(0-18°C & 28-40°C)
500V
10M
Ω
<1mA 0.8% 0.03%/°C
500V
100M
Ω
<1mA 1.1% 0.05%/°C
500V
1G
Ω <1mA 4.0% 0.12%/°C
50V
1M
Ω <1mA 1.1% 0.04%/°C
50V
10M
Ω <1mA 1.1% 0.06%/°C
50V
100M
Ω <1mA 1.6% 0.13%/°C
(7753 Only)
Source
Voltage
Resistance
Range
Max.
Short Ckt.
Current
Accuracy
%Rdg
Temperature
Coefficient
(0-18°C & 28-40°C)
500V
1M
Ω <1mA 0.8% 0.02%/°C
500V
10M
Ω <1mA 0.9% 0.03%/°C
500V
100M
Ω <1mA 1.3% 0.10%/°C
500V
1G
Ω <1mA 6.7% 0.27%/°C
50V
0.1M
Ω <1mA 1.1% 0.03%/°C
50V
1M
Ω <1mA 1.1% 0.04%/°C
50V
10M
Ω
<1mA 1.3% 0.11%/°C
50V 100M
Ω
<1mA 4.5% 0.30%/°C
Current Source Output
Output Level: Programmable 0 to 50mA (Ch. 27).
Programming Resolution: 10µA.
Output Voltage: 5.5V
±10%
compliance.
Accuracy: 0.06% + 10µA (2 yr Specification).
Settling Time: 1mS to 0.1% of final value (typ).
Temperature Coefficient: (0-18°C & 28-40°C)
(0.001%+0.25µA)/°C
Dry Circuit Clamp (Ch. 24): 20mV
±
10%, Isource
≤
1mA
Voltage Source Output (7751/7753 Only)
Output Level: Programmable 50V to 500V (CH. 28).
Programming Resolution: 100mV.
Output Current: (7751) - 50µA maximum for rated accuracy, <1mA typical
into short circuit.
(7753) - 500µA maximum for rated accuracy, <1mA typical
into short circuit.
Accuracy: 0.5% + 0.13V (2yr Specification).
Settling Time: Rise Time: 50V to 500V step, 0.1% of final value,
250 ms max.
Fall Time: 500V to 50V step, 0.1% of final value,
1000 ms max.
Temperature Coefficient: (0-18°C & 28-40°C)
(0.001%+0.005V)/°C
Safety Limit: Current limited maximum current of 1mA.
Cable Discharge (Ch. 20): 100k
Ω
Shunt
Max Capacitance: 1nF
Current Measure Input (7751/7753 Only)
Range: 7751 (0-50µA), 7753 (0-500µA).
Accuracy: (7751) 0.5% (of reading) + 6nA (2yr Specification).
(7753) 0.5% (of reading) + 60nA (2yr Specification).
Temperature Coefficient: (0-18°C & 28-40°C) (0.02%+0.5nA)/°C
Voltage Burden: <1mV.
Switching Capabilities
(Bank 1 – Bank 4)
4 Channels: 1 Form A switch.
8 Channels: 4 4-pole or 8 2-pole signals into DMM or I/V converter.
Contact Check: 4-Wire contact check through internal DMM.
Relay Type: Latching electromechanical.
Actuation Time: <3ms.
Contact Life (typ): >10
6
operations at maximum source level.
>10
8
operations cold switching.
Contact Resistance: <1 Ohm at end of contact life.
Contact Potential: <±2µV typical per contact pair, ±3µV max.
Connector Type: Plugable screw terminal, #22 AWG wire size.
Isolation Between any two Terminals
1
: >1G
Ω
, <100pF.
Isolation Between Terminals and Earth
1
: >1G
Ω
, <200pF.
Isolation Between Channel Groups
1
: >500G
Ω
, <100pF.
External Common Mode Voltage: 42V between any terminal and chassis.
(Connect no external sources.)
7751, 7752, or 7753 Module Notes
1
Isolation for channels 1-12, only one channel closed at a time, or all channels
open.
2
See User's manual for ohm specifications at sources other than those specified.
3
All specifications valid for 1 NPLC ADC aperture setting.
System Throughput
(Connect, source, measure, calculate)
0.01 NPLC, Filter Off, over GPIB Bus
High Ohms (Source V): 13 Rdgs/Sec
1
Low Ohms (Source I): 9 Rdgs/Sec
1 NPLC, Filter On, Over GPIB Bus
High Ohms (Source V): 11 Rdgs/Sec
1
Low Ohms (Source I): 7 Rdgs/Sec
System Throughput Notes
1. Reset upon fixed Vsource level, no settling time.