Analog Input Section
Common mode (referred to system ground)
Ranges
Less than
±
10 V
Larger than or equal to
±
10 V
Rejection (CMR)
> 80 dB @ 80 Hz (100 dB typical)
> 60 dB @ 80 Hz (80 dB typical)
Maximum common mode voltage
7 V RMS
1000 V RMS
-120
-100
-80
-60
-40
-20
0
0.01
0.1
1
10
100
1000
Frequency [kHz]
Common mode response
< ± 10 V ranges
≥ ± 10 V ranges
M
ag
n
it
u
d
e
[d
B
]
Figure A.136:
Representative common mode response
Input overload protection
Overvoltage impedance change
The activation of the overvoltage protection system results in a reduced input impedance.
The overvoltage protection is not active for as long as the input voltage remains less than
200% of the selected input range or 1250 V, whichever value is the smallest.
Maximum nondestructive voltage
±
2000 V DC
Maximum overload without auto range
200% of selected range
Automatic auto range
When overload causes the amplifier to overheat, the amplifier increases its range in steps
of a factor of 10 until the overload ceases. When the overload exceeds 1000 V, the input
signal is disconnected and the amplifier input is grounded. When the temperature returns
to normal, the range that was originally selected is restored. The automatic auto range
cannot be turned off.
Overload recovery time
Restored to 0.1% accuracy in less than 5 μs after 200% overload
Analog to Digital Conversion
Sample rate per channel
0.1 S/s to 200 kS/s
ADC resolution; one ADC per channel
18 bit
ADC type
Successive Approximation Register (SAR); Analog Devices AD7641BCPZ
Time base accuracy
Defined by mainframe:
±
3.5 ppm
(1)
; aging after 10 years
±
10 ppm
Binary sample rate
Supported; produces rounded BIN values when calculating FFTs
Maximum binary sample rate
204.8 kS/s
External time base frequency
0 S/s to 200 kS/s
External time base frequency divider
Divide external clock by 1 to 2
20
External time base level
TTL
External time base minimum pulse width
200 ns
(1)
Mainframes using Interface/Controller modules shipped before 2012:
±
30 ppm.
GEN3i
I3763-3.1 en HBM: public
551
