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Analogue output signals tend to fall into two broad categories. the first is their use as control signals, which are generally slowly changing. Typically the computer software may be used to generate an output voltage prior to making measurements; or the computer may be monitoring one or more input signals and using these to calculate a control signal. The Microlink 3000 system offers the 303x range of digital to analogue converters for these control applications, giving a choice of voltage or current outputs at different resolutions.
The second category of use of analogue output signals is that of waveform generation. This is covered by the Microlink 4000 Series. For details of the 4000 please send for our free catalogue.
There are 4 modules in the 303x range. They modules plug into a Microlink 3000 frame.
The 3030 provides 4 independent digital-to-analogue converters, each producing a voltage output. A converter (output channel) consists of a group of 8 connections on the 37-way D type connector.
The connections configure the channels as either bipolar or unipolar with maximum ranges of ±10.24V and 0 to 10.24V respectively. Smaller ranges can be achieved by dividing down the Reference Out connection with 2 resistors. If the Reference In connection is an AC signal, the channel functions as a programmable attenuator. This signal could be up to 10 kHz in frequency. Alternatively the output of one 3030 channel can be fed to the reference input of another channel giving a D-A converter with a finely controlled full-scale range.
At power-up the output is always 0V; or in the case of bipolar outputs can be set to either 0V or the full scale negative output. Each output can supply 20mA of current and is short circuit protected.
Number of outputs 4 Type of output Voltage D-A resolution 12-bits Voltage ranges Hardware configured Current available 20 mA Max linearity error ±0.025% Output impedance 0.05 Ohms Connection 37-way D Screw terminal option Yes Power-up, reset state 0 V or full scale -ve
The 3031 provides 4 independent D-A converters of 12-bit resolution. It produces 4-20mA current outputs, suitable for use in industrial environments. Each output is capable of driving up to 750 Ohms. The source of the power supply for the 4-20mA signals can be from the Microlink, or from an external power supply (15-30V).
Number of outputs 4 Type of output Current D-A resolution 12-bits Current available 4-20 mA Max linearity error ±0.025% Screw terminal option Yes Power-up, reset state 4 mA
This module is intended for the generation of accurate voltage outputs with a number of fixed full scale ranges. It provides a single channel of 12-bit D-A conversion. A wide variety of output ranges are available through software. The output is short circuit protected and delivers 20mA of current.
Number of outputs 1
Type of output Voltage
D-A resolution 12-bits
Voltage ranges Software selected:
0 to 1, 2, 5, 10 V
±1, ±2, ±5, ±10 V
Current available 20 mA
Max linearity error ±0.013%
Output impedance 0.05 Ohms
Connection BNC
Power-up, reset state 0 V
The 3033 is similar to the 3032 but has 16-bit resolution and so is even more accurate. A wide variety of output ranges are available through software. The output can provide up to 20mA of current, but you should note that if you draw significant currents, lead resistance becomes an important error source. For example, on the 0 to 10 V range with 20 mA of output current, every 15mOhm of lead resistance will cause 1 LSB of error at the load. The output is short circuit protected.
Number of outputs 1
Type of output Voltage
D-A resolution 16-bits
Voltage ranges Software selected:
0 to 1, 2, 5, 10 V
±1, ±2, ±5, ±10 V
Current available 20 mA
Max linearity error ±0.003%
Output impedance 0.05 Ohms
Connection BNC
Power-up, reset state 0 V
You can control the Microlink 3000 with Windmill, SCAN1000 or Excel software. Alternatively you can program the Microlink yourself: ask for our programming manuals and example programs.
For more details on analogue outputs:
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