6½ Digit PXI Digital Multimeters (M9181A, M9182A, M9183A).pdf - 第16页
Find us at www. keysigh t.com Page 16 Measurement Characteristics (continued) Transact ion Spee d Transac tional I/O s peed is a single r eading me asurem ent. This is important when you are tak ing many single m easurem…
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Measurement Characteristics
Measurement aperture
Maximum readings per second
Resolution
M9181A Resolution vs. Aperture and Reading Rate for DCV, DCI, Ω
1.28 s
0.8
6½ digits (21 bits)
160 ms
6
6 digits (20 bits)
20 ms
45
5½ digits (18 bits)
10 ms
85
5 digits (17 bits)
5 ms
150
4½ digits (16 bits)
M9182A / M9183A Resolution vs. Aperture and Reading Rate for DCV, DCI, Ω
10 ms
98
6½ digits (22 bits)
625 µs
1,200
5½ digits (18 bits)
130 µs
4,500
4½ digits (14 bits)
2.5 µs
15,000 (M9183A only)
1
4½ digits (14 bits)
1. 15,000 readings/second represent a typical maximum with a measurement aperture of 2.5 µs. Results will vary, depending
on what PC hardware, PXI hardware, and driver are used.
Time frame of a single measurement
Minimum read interval = 66 µs (M9183A)
Minimum read interval = 222 μs (M9182A)
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Measurement Characteristics (continued)
Transaction Speed
Transactional I/O speed is a single reading measurement. This is important when you are taking many
single measurements with the DMM. The M9183A delivers the highest transactional measurement speed
in its class. These fast readings, up to 15,000 readings per second with a read interval rate of 66 µs,
provides the lowest latency, translating into higher test-system throughput and lower cost of test per unit
tested. Variable delay can be programmed to allow fully settled readings in most configurations.
System Reading and Throughput Rates (M9182A/3A)
Switching ranges within a function
Aperture (A)
Range change time (ms)
DCV
A ≤ 20 ms
(A × 0.2) + 15
A > 20 ms
A + 15.6
Resistance (2-wire or 4-wire)
A < 33 ms
(A × 0.05) + 15.5
A ≥ 33 ms
A + 13
DCI (200 mA or 2 A to any other
range)
A ≤ 40 ms
4.2
A > 40 ms
15.7
DCI (all other ranges)
All apertures
1
Capacitance
All apertures
12
Switch between functions
Aperture (A)
Function change time (ms)
DCV
A < 16 ms
15.6
A ≥ 16 ms
A + 25
Resistance to DCI
A < 16.66 ms
7.8
16.66 ms ≤ A < 40 ms
A × 0.65
40 ms < A < 66.66 ms
7.8
A ≥ 66.66 ms
(A × 0.51) + 45
DCV to capacitance
A < 33.33 ms
23.4
A ≥ 33.33 ms
(A × 0.65) + 50
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Resistance to
capacitance
A ≤ 33.33 ms
23.4
33.33 ms < A < 80 ms
(A × 2) + 35
80 ms ≤ A < 160 ms
23.4
A ≥ 160 ms
160
DC Voltage
Measurement
method
Delta-sigma A/D conversion
Input resistance
200 mV, 2.0 V ranges: >10 GΩ with typical leakage of < 50 pA;
M9181A: 20 V, 200 V ranges: 10.0 MΩ
M9182A/3A: 20 V, 200 V, 300 V ranges: 10.0 MΩ
Input isolation
M9181A: 240 V from Earth ground
M9182A/3A: 250 V from Earth ground
Input overvoltage
protection
M9181A: 240 VDC on voltage inputs
M9182A/3A: 250 VDC all ranges
DCV noise rejection M9181A: Normal mode rejection at 50, 60, or 400 Hz ± 0.5%; > 90 dB
(apertures ≥ 0.160 s); CMRR (1 kΩ lead imbalance) ≥ 100 dB
M9182A/3A: Normal mode rejection at 50, 60, or 400 Hz ± 0.5%; > 95 dB
(apertures ≥ 0.160 s); CMRR (1 kΩ lead imbalance) ≥ 120 dB
True RMS AC Voltage
Measurement
method
M9181A: AC coupled (10 Hz to 100 kHz) true RMS — measures the AC
component only. Analog RMS DC converter.
M9182A/3A: AC coupled (10 Hz to 100 kHz) true RMS — measures the AC
component of an input waveform that consists of AC and DC components.
Crest factor
Maximum crest factor of 4 at full scale, 7 at 10% of range
Input impedance
1 MΩ, in parallel with < 300 pF
Settling time
< 0.5 sec to within 0.1% of final value
Fast RMS (M9182A/3A): < 0.05 sec to within 0.1% of final value