7B30 Isolated, Voltage or Current Input
7B30 Isolated, Voltage or Current Input
The 7B30 is a single-channel signal conditioning module that interfaces, amplifies and filters unipolar and bipolar millivolt and voltage inputs and provides a protected precision output of either +1 V to +5 V or 0 V to +10 V. To measure a process current input, a plug-in 250 Ω current sensing resistor, Model AC1391, may be installed directly on the 7B backplane, using available pin sockets. The external current sense resistor allows the current loop to be maintained even when the module is removed from the backplane. Model 7B30 features a nonlinearity of ±0.02% maximum and an accuracy of ±0.1% maximum (±0.01% typical). To accurately measure low level signals in electrically noisy environments, 1500 V rms of galvanic transformer-based isolation with a common mode rejection (CMR) of 160 dB @ 50/60 Hz and a normal mode rejection (NMR) of 60 dB @ 50/60 Hz are provided. Rated to operate with a nominal +24 V DC supply, Model 7B30 is mix-and-match and hot-swappable with other 7B Series input modules, so it can be inserted or removed from any socket in the same backplane without disturbing system power.
Inside the 7B30 Series Module
The floating differential input of Model 7B30 is fully protected up to 120 V rms line voltage. A one-pole 3 Hz filter preconditions the input signal prior to amplification by a low drift input amplifier. Amplitude modulation is used to implement transformer isolation (1500 V rms input-to-output and power). Isolated front-end circuitry power is supplied by a DC/DC converter. The output section contains a two-pole low pass filter (-3 dB @ 3Hz), a buffer amplifier and a power oscillator. The two-pole output filter and subsequent buffer ensures that a low noise, low impedance (<1 Ω) signal is available at the output to drive loads of 2 kΩ minimum.
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Figure 1. 7B30 Functional Block Diagram |
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Figure 2. 7B30 Input Field Connections |
Input Types | Output Options |
±10 mV to ±1 V 0 to 20 mA 4 mA to 20 mA |
+1 V to +5 V 0 V to +10 V |
Model |
Input Range |
Output Range | |
Order Now | 7B30-01-1 | 0 mV to +10 mV |
+1 V to +5 V |
Order Now | 7B30-02-1 | 0 mV to +100 mV | +1 V to +5 V |
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7B30-02-2 | 0 mV to +100 mV | 0 V to +10 V |
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7B30-03-1 | 0 V to +1 V | +1 V to +5 V |
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7B30-03-2 | 0 V to +1 V | 0 V to +10 V |
Order Now | 7B30-05-1 | +1 V to +5 V | +1 V to +5 V |
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7B30-05-1 |
+4 mA to +20 mA1 |
+1 V to +5 V |
Order Now | 7B30-05-2 | +1 V to +5 V | 0 V to +10 V |
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7B30-05-2 | 0 mA to +20 mA1 | 0 V to +10 V |
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7B30-06-1 | -10 mV to +10 mV | +1 V to +5 V |
Order Now | 7B30-06-2 | -10 mV to +10 mV | 0 V to +10 V |
Order Now | 7B30-07-1 | -100 mV to +100 mV | +1 V to +5 V |
Order Now | 7B30-07-2 | -100 mV to +100 mV | 0 V to +10 V |
Order Now | 7B30-08-1 | -1 V to +1 V |
+1 V to +5 V |
Order Now | 7B30-08-2 | -1 V to +1 V | 0 V to +10 V |
1 Models 7B30-05-1 and 7B30-05-2 may be used to measure a process current input by installing a 250 Ω current sensing resistor, such as Model AC1391, on the backplane. With this resistor installed, the current loop is maintained even when the module is removed from the backplane.
7B30 Specifications
(typical @ +23°C ±5°C and Vs = +24 V dc)
Warm-up time required to meet specifications is approximately 10 minutes.
* Contact factory for OEM requirements.
1 Model 7B30 may be used to measure a process current input by installing a 250 Ω current sensing resistor, such as Model AC1391, on the backplane. With this resistor, the current loop is maintained even when the 7B30 module is removed form the backplane.
2 Includes the combined effects of repeatability, hysteresis, and nonlinearity.
3 Nonlinearity is calculated using best-fit straight line method.
4 Vz is the nominal input voltage that results in a 0 V output.
Specifications subject to change without notice.
(typical @ +23°C ±5°C and Vs = +24 V dc)
Description |
Model 7B30 |
Range1 | |
Standard Ranges | ±10 mV to ±1 V (Refer to Model Table) |
Custom Ranges | Not Available* |
Output Range Options (RL > 2 kΩ) |
+1 V to +5 V or 0 V to +10 V |
Accuracy2 |
|
Initial @ +25° |
±0.01% Span (±0.1% Span, maximum) |
Nonlinearity3 | ±0.02% Span, maximum |
Input Offset vs. Temperature | ±0.5 µV/°C |
Zero Suppression vs. Temperature | ±0.005% (Vz)4/°C |
Span vs. Temperature | ±35 ppm/°C |
Output Offset vs. Temperature | ±0.001% Span/°C |
Input Bias Current | ±1 nA |
Input Resistance |
|
Power ON |
2MQ |
Power OFF | 30 kΩ, minimum |
Output Noise |
|
5 MHz Bandwidth | 6 mV peak |
10 Hz to 100 kHz Bandwidth |
0.4 mV rms |
0.1 Hz to 10 Hz Bandwidth |
0.6 µV peak |
Bandwidth, -3 dB | 3 Hz |
Output Rise Time, 10% to 90% Span |
150 ms |
Common-Mode Voltage (CMV) | |
Input-to-Output and Power |
1500 V rms, continuous |
Common-Mode Rejection (CMR) |
|
Output-to-Input and Power @ 50/60 Hz |
160 dB |
Normal Mode Rejection @ 50/60 Hz |
60 dB |
Input Protection | 120 V rms, continuous±35 V dc, continuous |
Input Transient Protection | ANSI/IEEE C376.90.1-1989 IEEE-STD 472 IEC 255-4, Class II |
Output Resistance | < 1 Ω |
Output Protection | Continuous Short to Ground |
Power Supply | |
Voltage Range, Operating | +14 V dc to +35 V dc |
Current |
+25 mA, maximum |
Sensitivity |
±0.0001%/% of Vs |
Mechanical Dimensions | 1.663" x 2.11" x 0.563 (42.24 mm x 53.6 mm x 14.3 mm) |
Weight | 60 grams |
Environmental | |
Temperature Range | |
Operating | -40°C to +85°C |
Storage | -40°C to +85°C |
Relative Humidity, 24 hours |
0 to 90% @ +60°C noncondensing |
ESD Sensitivity |
IEC 801-2, Level 2 |
RFI Susceptibility | ±0.5% Span error @ 400 MHz, 5 Watt, 3 ft |
Warm-up time required to meet specifications is approximately 10 minutes.
* Contact factory for OEM requirements.
1 Model 7B30 may be used to measure a process current input by installing a 250 Ω current sensing resistor, such as Model AC1391, on the backplane. With this resistor, the current loop is maintained even when the 7B30 module is removed form the backplane.
2 Includes the combined effects of repeatability, hysteresis, and nonlinearity.
3 Nonlinearity is calculated using best-fit straight line method.
4 Vz is the nominal input voltage that results in a 0 V output.
Specifications subject to change without notice.