1 GENERAL DESCRIPTION AND SPECIFICATIONS
The Model 10A61-2 accepts one or two independent current signals within the ISA
standard range of 4-20 mA. Both unipolar and bipolar (“zero-center”) inputs are
allowed. Since the 10A61-2 does not provide excitation, the current source must sup-
ply its own power supply, if required.
Chopper-stabilized amplification with active low-pass filtering yields excellent voltage
compliance and make the 10A61-2 suitable for virtually any standard Process Industry
current input.
ADDITIONAL 10A61-2 SPECIFICATIONS
Input Current
: 4 to 20 mA (unipolar) or 4 to 12 to 20 mA (bipolar or “zero-center”);
automatically selected—on an individual channel basis—when the channel is config-
ured; for the System 10 channel “type” codes assigned to 10A61-2 data channels,
see Table 1, below
Amplifier (per channel):
Common-Mode Range: ±50 V operating; ±90 V without instrument damage
Common-Mode Rejection Ratio: DC: -60 dB; at 60 Hz: -75 dB
Input Impedance: Differential: 100 Ω; Common-Mode: 125 kΩ
Burden: 2 V-DC at full scale
Offset: Initial: ±0.05% of full scale; vs. Temperature: ±50 ppm/°C; vs. Time: ±20
ppm/month
Gain Accuracy: ±0.02% of full scale typical, following calibration*
Gain Stability: vs. Temperature: ±50 ppm/°C; vs. Time: ±50 ppm/month
Filter (per channel): 3-pole modified Butterworth; 3 dB down at 10 Hz; 60 dB down at
100 Hz
Step-Response Settling Time (Full-Scale Output):
To 1% of final value: 150 msec
To 0.1% of final value: 200 msec
To 0.02% of final value: 250 msec
Auxiliary Outputs: Filtered outputs available on mainframe wire-wrap pins
* Initial (uncalibrated) inaccuracy may be as great as ±0.05% of full scale. Maximum error that
could occur upon replacement of a Model 10A61-2 not followed by calibration is ±0.1% of full
scale.
GENERAL DESCRIPTION AND SPECIFICATIONS 10A61-2.1
SYSTEM 10
ANALOG INPUT CARDS
1.E.2.10A61-2
MODEL 10A61-2
DUAL 4-20 MA
C
ONDITIONER CARD
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