Specifications A-9
DC Amps (cont’d)
DCI Reading Rates
4,5
Readings/Second with
Measurement
Default
Readings/Second to Memory
Readings/Second to IEEE-488
9
Time Stamp to IEEE-488
9
PLC
Aperture
Bits
Digits
Autozero Off
Autozero On
Autozero Off
Autozero On
Autozero Off Autozero On
10
167 ms (200 ms)
29
7
½
6
( 5 )
2 (1.7)
6
( 5 )
2 (1.6)
6
( 5 )
2 (1.6)
2
33.4 ms (40 ms)
27
7
½
29
(25)
9 (7.6)
29
(24)
9 (7.4)
27
(22)
9 (7.4)
1
16.7 ms (20 ms)
26
6
½
56
(48)
47
(40)
55
(45)
46
(38)
50
(41)
42
(34)
0.2
3.34 ms
(4 ms)
23
6
½
222
(197)
157 (140)
209
(186)
150 (133)
156 (139)
113 (100)
0.1
1.67 ms
(2 ms)
22
5
½
334
(321)
178 (171)
310
(298)
168 (161)
186 (178)
124 (119)
0.02
334
µ
s (400
µ
s)
20
5
½
334
(334)
184 (184)
310
(310)
174 (174)
187 (187)
127 (127)
0.01
167
µ
s (167
µ
s)
19
4
½
387
(387)
186 (186)
355
(355)
176 (176)
202 (202)
128 (128)
0.01
7
167
µ
s (167
µ
s)
19
4
½
2000 (2000)
2000 (2000)
Speed and Accuracy
90 Days
ACCURACY
1,8
±
(ppm of ppm of range+ppm of range rms noise
4
)
1PLC
DFILT On,
1PLC
0.1PLC
0.01PLC
7
Range
10 Readings
DFILT Off
DFILT Off
DFILT Off
200
µ
A
275+25+0
275+25+0.5
300+25+50
300+200+80
2 mA
275+20+0
275+20+0.5
300+20+50
300+200+80
20 mA
275+20+0
275+20+0.5
300+20+50
300+200+80
200 mA
300+20+0
300+20+0.5
325+20+50
325+200+80
2
A
600+20+0
600+20+0.5
625+20+50
625+200+80
PLC = Power Line Cycles. DFILT = Digital Filter.
Keithley Factory Calibration Uncertainty
Range
ppm of reading
200
µ
A
43
2 mA
40
20 mA
55
200 mA
162
2
A
129
Factory calibration uncertainty represents traceability to
NIST. This uncertainty is added to relative accuracy
specifications to obtain absolute accuracies. The
uncertainties for each range are equal to the uncertainty of
the respective calibration sources.
DC Amps Notes
1 Specifications are for 1 power line cycle, autozero on, 10-reading repeat digital filter.
2 For T
CAL
±
1
°
C, following 55-minute warm-up. T
CAL
is ambient temperature at calibration
(23
°
C at the factory).
3 For T
CAL
±
5
°
C, following 55-minute warm-up.
4 Typical values. Peak-to-peak noise equals 6 times rms noise.
5 For on-scale readings, no trigger delays, internal trigger, digital filter off, normal autozero,
display off, SREAL format. These rates are for 60Hz and (50Hz). Rates for 400Hz equal those
for 50Hz.
6 Actual maximum burden voltage = (maximum burden voltage)
×
(I
MEASURED
/I
FULL SCALE
).
7 In burst mode, display off. Burst mode requires autozero refresh (by changing resolution
or measurement function) once every 24 hours.
8 For T
CAL
±
5
°
C, normal autozero. 1-year and 2-year accuracy can be found by applying the
same speed accuracy ppm changes to the 1-year or 2-year base accuracy.
9 Using Internal Buffer.
Settling Characteristics
<500
µ
s to 50ppm of step
size. Reading settling times
are affected by source
impedance and cable
dielectric absorption
characteristics.
Maximum Allowable Input
2.1A, 250V.
Overload Protection
2A fuse (250V), accessible
from front (for front input)
and rear (for rear input).
Autoranging
Autoranges up at 105% of
range, down at 10% of
range.
DC In-Circuit Current
The DC in-circuit current measurement function allows a user to measure the current through
a wire or a circuit board trace without breaking the circuit.
When the In-Circuit Current Measurement function is selected, the 2002 will first perform a 4-
wire resistance measurement, then a voltage measurement, and will display the calculated
current.
TYPICAL RANGES
Current
100
µ
A to 12A.
Trace Resistance
1m
Ω
to 10
Ω
.
Voltage
±
200mV max. across trace.
Speed
4 measurements/second at 1 power line cycle.
Accuracy
±
(5% + 500
µ
A). For 1 power line cycle, autozero on, 10-
reading digital filter, T
CAL
±
5
°
C, 90 days, 1 year or 2 years.
Measurement Range Chart
10
Ω
1
Ω
100m
Ω
10m
Ω
1m
Ω
1mA 10mA 100mA 1A
10A
100A
100
µ
A
Measured Current
T
race R
esistance
Specified
Measurement Range
Содержание 2002
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