● Provides four floating 16-bit analog outputs with 750 VDC isolation. Controls analog devices without ground loops. ● Four differential analog inputs with individual programmable ranges. Programmable inputs for reading voltage sources, current shunts, sensors etc. ● High current drivers can operate external relays etc. Digital control of external devices. ● Digital inputs read or monitor discrete signals. Generates SRQ on selected signal changes. ● User setable scale factors for analog signals. Matches 4861A commands and responses to real values. ● OEM board versions available with serial (RS-232/RS-485) and GPIB interfaces. Choice of interfaces. ● Includes sample control, calibration and configuration programs. Complete software package.
Model 4861A is a compact, IEEE-488.2/GPIB-to-Analog Interface that provides signals for controlling analog devices from the GPIB bus. The ICS Analog Interface 4861A has four floating analog output channels, four differential analog inputs, digital output drivers and digital inputs. The analog values can be scaled to match the physical values of the input signals or of the controlled parameters. The scale factors and all other user set configuration parameters are saved in flash memory until changed. The 4861A accepts both industry standard SCPI commands and easy-to-use short form commands. Typical 4861A applications are controlling power supplies, providing analog stimuli or measuring analog signals.
OEM board versions of the ICS Analog Interface 4861A are available in a variety of configurations to match the analog control needs. The 4861A's firmware can be customized to add new commands or operate with an alternate language such as the MATE CIIL command set.
IEEE 488 Bus interface meets IEEE STD
488.1-1987 and has the following capabilities:
SH1, AH1, T6, L4, SR1, PP0, DC1,
RL1, DT1, C0 and E1/E2 drivers.
Bus drivers incorporate power-up/
down protection to prevent sending invalid
data to the bus.
GPIB Address Capability
0-30
SRQ Generation
SRQs are generated if the event and
summary bits are enabled and the event
or signal change occurs. Events include
the 488.2 Event Status Bits and the monitored
digital inputs.
RS-232/RS-485 asynchronous interfaces
on an internal 10 pin header. Data rates
up to 115.2 Kbaud.
RS-232 interface includes TX, RX, and ground signals. Optional isolation by special order.
RS-485 interface includes TX/RX+ and RX/RX- signals with a 220 Ω load resistor and 1 KΩ pullup/pulldown resistors. Network mode supports 16 units
on one network.
Analog Inputs
All parameters are specified at 25 °C. Polarity is jumper selected.
Channels
4
Range
0.1, 1 or 10V
Polarity
Unipolar or bipolar
Max. Input
30V max.
Input Impedance
1 MΩ
Isolation
750V
Resolution
1 part in 4096 std
Non-linearity
± 1 bit on 10 V range
FS Error
Unipolar
10V, 1V, 100mV, 5mV, 1mV, 0.5mV
Bipolar
10mV, 2mV, 1mV
Temp Drift
17 PPM/°C
End Point
2x FS error
Read time
8.5 ms max.
Analog Outputs
All parameters are specified at 25 °C. Range is jumper selected.
Channels
2, 3 or 4
Ranges
0 to +10, ±10, ±5 VDC
Output current
±5 mA typ.
Isolation
750 VDC, Ch# 4 is referenced to A/D ground.
Zero
Unipolar
0
Bipolar
Mid range
Resolution
1 part in 65.535
Non-linearity
± 4 bits
Zero error
± 8 bits (Unipolar)
± 4 bits (Bipolar)
End Point Error
± 30 mV
Temp Drift
Gain
±15 typ., 40 max.
PPM/° C
Unipolar Offset
±25 PPM FSR/° C
Bipolar Zero
±35 PPM FSR/° C
Temperature
-10 °C to +55 °C
Output ripple
30 mV P-P, 500 kHz
Update time
8 ms from command
terminator.
Digital Lines
Inputs
8 lines with 33 KΩ pullups for TTL/CMOS signals or contact closure to ground.
Logic Levels
Low = 0 ± 0.5 VDC
High = > 2.4 VDC
Query time
10 msec to GPIB response
Outputs
4 darlington driver outputs with diodes to V common input
