Noise Performance - Keithley 2182 Service Manual

2182A Nanovoltmeter Specifications
VOLTS SPECIFICATIONS (20% OVER RANGE)
CONDITIONS: 1PLC with 10 reading digital filter or 5PLC with 2 reading digital filter.
CHANNEL 1
RANGE RESOLUTION
2,3,4
10.000000 mV 1 nV
100.00000 mV 10 nV
1.0000000 V 100 nV
1 µV
10.000000 V
4 10 µV
100.00000 V
6,10
CHANNEL 2
100.00000 mV 10 nV
1.0000000 V 100 nV
1 µV
10.000000 V
CHANNEL 1/CHANNEL 2 RATIO: Ratio accuracy = ±channel 2 reading (accuracy channel 1 range) + channel 1 reading (accuracy channel 2 range)
DELTA (hardware-triggered coordination with 24XX series or 622X series current sources for low noise R measurement): accuracy = accuracy of selected
Channel 1 range plus accuracy of I source range.
DELTA measurement noise with 6220 or 6221 : Typical 3nVRMS/
PULSE-MODE (with 6221): line synchronized voltage measurements within current pulses from 50us to 12ms, pulse repetition rate up to 12 Hz
Pulse measurement noise:
(typical RMS noise, R
*
0.0028ppm for the 100mV range, 0.0016ppm for ranges 1V and above

NOISE PERFORMANCE

DC
Response time = time required for reading to be settled within noise levels from a stepped input, 60Hz operation.
CHANNEL 1
RESPONSE TIME NPLC, FILTER
25.0 s 5, 75
4.0 s 5, 10
1.0 s 1, 18
667 ms 1, 10 or 5, 2
60 ms 1, Off
6,10
CHANNEL 2
25.0 s 5, 75
4.0 s 5, 10
1.0 s 1, 10 or 5, 2
85 ms 1, Off
VOLTAGE NOISE VS. SOURCE RESISTANCE
TO-PEAK)
SOURCE
RESISTANCE NOISE
0 Ω
6 nV
100 Ω
8 nV
15 nV
1 kΩ
35 nV
10 kΩ
100 nV
100 kΩ
350 nV
1 MΩ
1
24 Hour
±1°C
INPUT RESISTANCE T
CAL
20 + 4
>10 GΩ
10 + 3
>10 GΩ
7 + 2
>10 GΩ
5
2 + 1
>10 GΩ
10 + 3
10 MΩ±1%
10 + 6
>10 GΩ
7 + 2
>10 GΩ
5
2 + 1
>10 GΩ
√
Hz (10mV range)
<10 ohms) (0.009ppm of range
DUT
**
Hz for ranges above 10mV
8nV/√
7
(DC NOISE EXPRESSED IN VOLTS PEAK-TO-PEAK)
10mV 100mV
6 nV 20 nV
15 nV 50 nV
25 nV 175 nV
35 nV 250 nV
70 nV 300 nV
- 150 nV
- 150 nV
- 175 nV
- 425 nV
ANALOG FILTER DIGITAL FILTER
Off 100
Off 100
Off 100
Off 100
On 100
On 100
ACCURACY: ±(ppm of reading + ppm of range)
(ppm = parts per million) (e.g., 10ppm = 0.001%)
90 Day 1 Year
±5°C ±5°C
T T
CAL CAL
40 + 4 50 + 4
25 + 3 30 + 4
18 + 2 25 + 2
18 + 2 25 + 2
25 + 3 35 + 4
25 + 6 30 + 7
18 + 2 25 + 2
18 + 2 25 + 2
2
(channel 2 reading)
21
. 1 Hz achieved with 1PLC, delay = 1ms, RPT filter = 23 (20 if 50Hz)
* √
/
)/meas_time/√pulse_avg_count + 3nV
meas_time(sec) = pulsewidth – pulse_meas_delay in 33us incr.
RANGE
1V 10V
75 nV 750 nV
1.5 µV
150 nV
2.5 µV
600 nV
3.3 µV
650 nV
6.6 µV
700 nV
200 nV 750 nV
1.5 µV
200 nV
2.5 µV
400 nV
1 µV 9.5 µV
11
(DC NOISE EXPRESSED IN VOLTS PEAK-
TEMPERATURE
2 Year
COEFFICIENT
±5°C
T 0°-18°C & 28°-50°C
CAL
60 + 4 (1 + 0.5)/°C
40 + 5 (1 + 0.2)/°C
32 + 3 (1 + 0.1)/°C
32 + 3 (1 + 0.1)/°C
52 + 5 (1 + 0.5)/°C
40 + 7 (1 + 1)/°C
32 + 3 (1 + 0.5)/°C
32 + 3 (1 + 0.5)/°C
(2 · meas_time · pulse_avg_count) for 10mV range
8
100V NMRR
75 µV
110 dB
75 µV
100 dB
100 µV
95 dB
150 µV
90 dB
300 µV
60 dB
- 110 dB
- 100 dB
- 90 dB
- 60 dB
**
9
CMRR
140 dB
140 dB
140 dB
140 dB
140 dB
140 dB
140 dB
140 dB
140 dB
RKN 6/08/04
Rev A
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