IOtech 640 - Common mode rejection ratio; Wideband noise; IEPE bias source (640 e, 640 u, 650 e, 650 u channels 1 to 4); IEPE fault detection thresholds

Specifications are subject to change without notice.
IOtech 640 and 650 927791 Specifications 11-3
Common mode rejection ratio:
640e; 640u: -70dB typ; -55dB max, at 1kHz
650e; 650u: -56dB typ; -41dB max, at 1kHz
Figure XVII. 640 CMRR
Figure XVIII. 650 CMRR
Wideband noise:
Analysis
Frequency (Hz)
Typical Noise (µV rms)
640e, 640u
1
650e, 650u
2
20
2.4
11
50
3.5
15
100
4.6
20
200
6.2
26
500
9.0
37
1000
12.0
48
2000
16.0
62
5000
23.3
89
10000
31.1
116
20000
41.4
151
40000
55.1
197
1
640e, 640u: maximum noise @ <50°C = 1.4x; @> 50°C = 1.6x (where x is the typical value given in the above table).
2
650e, 650u: maximum noise @ <50°C = 1.4x; @> 50°C = 2.1x (where x is the typical value given in the above table).
IEPE bias source (640e, 640u, 650e, 650u channels 1 to 4):
Current: 2.1mA, 22V compliance (on/off software programmable per channel)
Impedance: >255kΩ
IEPE fault detection thresholds: <1V (short), >20V (open)
IEPE fault indication: Software indicator, per channel
Analog Output (640e / 640u only)
Channels: 1
Signal connection: BNC
Frequency range: DC to 45kHz (-3.0dB)
Frequency accuracy: ±50ppm
DAC resolution: 24 bit
DAC Update Rate: 93.75 KSps
DAC type: Delta-sigma
Total Harmonic Distortion: 1kHz; -96dB typical
Total Harmonic Distortion + Noise: 1kHz; -87dB typical
Initial Powered Up Value: 0.0V for 640e; not guaranteed for 640u
Amplitude settings: 0 to 7Vp-p
Amplitude flatness (DC to 20kHz): ±0.02dB typ ±0.1dB max
Figure XIX. 640 Analog Out Flatness vs. Frequency
Amplitude accuracy at 1kHz: ±0.05dB typ 0.12dB max
Figure XX. 640 Analog Output Distortion
SNR (DC to 20kHz): 100dB typ 90dB max
Maximum load: 1kΩ (50Ω with external power)
Waveform modes: Sine; Swept sine; Random; Burst; and Arbitrary
Output impedance: 50
Tachometer Inputs
Any analog input channel may be used as a tachometer input.