Keithley 6220 Reference Manual page 406

6221 AC and DC Current Source
SOURCE SPECIFICATIONS
Range Accuracy
(+5% over
(1 Year)
range)
23°C±5°C
±(%rdg. +
amps)
2nA
0.4% + 2pA
20nA
0.3% + 10pA
200nA
0.3% + 100pA
2μA
0.1% + 1nA
20μA
0.05% + 10nA
200μA
0.05% + 100nA
2mA
0.05% + 1μA
20mA
0.05% + 10μA
100mA
0.1% + 50μA
ADDITIONAL SOURCE SPECIFICATIONS
OUTPUT RESISTANCE: >10
OUTPUT CAPACITANCE: <10pF, <100pF Filter ON. (2nA/20nA
range)
LOAD IMPEDANCE: Stable into 10μH typical, 100μH with Output
Response SLOW.
CURRENT REGULATION: Line: <0.01% of range. Load:
<0.01% of range.
VOLTAGE LIMIT (Compliance): Bipolar voltage limit set with
single value. 0.1V to 105V in 0.01V programmable steps.
Accuracy for 0.1V to 20V: 0.1% +20mV, accuracy for 20V to
105V: 0.1% + 100mV
MAX. OUTPUT POWER: 11W, four quadrant source or sink
operation.
GUARD OUTPUT:
Maximum Load Capacitance: 10nF.
Maximum Load Current: 1mA for rated accuracy.
Accuracy: ±1mV for output currents <2mA (excluding output lead
voltage drop).
PROGRAM MEMORY: (offers point-by-point control and
triggering, e.g. Sweeps)
Number of Locations: 64K.
EXTERNAL TRIGGER: TTL-compatible EXTERNAL TRIGGER
INPUT and OUTPUT.
Max Trigger Rate: 1000/s.
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 - TestEquipmentDepot.com
Programming Temperature
Resolution
Coefficient/°C
0°-18°C& 28°-
50°C
100fA 0.02% + 200fA
1pA 0.02% + 200fA
10pA 0.02% + 2pA
100pA 0.01% + 20pA
1nA 0.005% + 200pA
10nA 0.005% + 2nA
100nA 0.005% + 20nA
0.005% + 200nA
1μA
10μA 0.01% + 2μA
14
Ω. (2nA/20nA range)
Typical Typical Output
Noise Noise Response
Bandwidth
(peak-peak) (peak-peak)
(BW) into
3,5 3,4,5
/RMS /RMS
Short
0.1Hz-10Hz 10Hz-(BW)
400/80fA 250/50pA 10kHz
4/0.8pA 250/50pA 10kHz
20/4pA 2.5/0.5nA 100kHz
200/40pA 25/5.0nA 1MHz
2/0.4nA 500/100nA 1MHz
20/4nA 1MHz
1.0/0.2μA
200/40nA 1MHz
5.0/1μA
1MHz
2/0.4μA 20/4.0μA
1MHz
10/2μA 100/20μA
Source Notes
1. Settling times are specified into a resistive load, with a maximum resistance
equal to 2V / I
fullscale of range
2. Settling times to 0.1% of final value are typically <2x of 1% settling times.
3. Noise current into <100Ω.
4. RMS Noise 10Hz-20MHz (2nA – 20mA Range) Less than 1mVrms, 5mVp-p
(into 50Ω load).
5. Typical values are non-warranted, apply at 23°C, represent the 50
and are provided solely as useful information.
1,2
Settling Time
(1% of final value)
Output Output
Resp. Fast Resp. Slow
5
(Typical ) (Max)
90μs 100μs
90μs 100μs
30μs 100μs
4μs 100μs
2μs 100μs
2μs 100μs
2μs 100μs
2μs 100μs
3μs 100μs
.
See manual for other load conditions.
th
percentile,
HW 1/17/05
Rev B
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