BK Precision MDL4U Series, Руководство пользователя

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Operations 55
Pin Signal Description
1 GND Ground
2 VF Voltage fault indication terminal
3 DI Digital input terminal
4 DO Digital output terminal
I OUT Current monitoring output
5 SENSE + Voltage remote measuring terminal ( + )
6 SENSE - Voltage remote measuring terminal ( - )
7 External analog controlling terminal ( + )
8 EXT_PRG- External analog controlling terminal ( - )
Table 4.5 Module Terminal Pinout
4.13.1 Voltage Failure Indication
When the electronic load is under OVP or reverse protection condition, pin 2 (VF) will output a high level signal.
4.13.2 Current Monitoring
The current monitoring terminal will output 0-10 V analog signal accordingly to 0 - full range of the input current. You
can connect an external voltmeter or an oscilloscope to display the input current’s change.
4.13.3 Digital I/O
Digital I/O is pin 3 and pin 4 shown in figure 4.16 and only used in remote control. The digital input terminal (pin 3)
can detect a high/low level signal. The digital output terminal (pin 4) can output a TTL high/low level signal. It is a
universal output terminal and can be used to control an external instrument.
4.13.4 Remote Sense Function
When working in CC, CV, and CR mode, if the electronic load consumes a very large current, it will cause a voltage drop
in the leads between the connected device and terminals of the electronic load. In order to ensure testing accuracy, the
electronic load provides a pair of remote sensing terminals in the rear panel where users can sense the output terminal
voltage of the connected device. Set the electronic load to REMOTE SENSE mode before using this function. On the
rear terminals, SENSE (+) and SENSE (–) are the remote sensing inputs. By eliminating the effect of the voltage drop
in the load leads, remote sensing provides greater accuracy by allowing the electronic load to regulate directly at the
source’s output terminals (see Figure 3.1 ).
4.13.5 External Analog Control
Controls the current setting of the electronic load in CC mode using the external analog programming terminal, pin 7
and pin 8. A 0-10 V input signal will simulate 0 – full scale of the electronic load to regulate the input current of the
electronic load (10 V indicates the full range of electronic load’s current rating)
Note:
External analog control is designed to be used when the instrument is set to High range (full range) only. If low
range is used, the 0-10 V input signal may not reflect the full scale input range of the load.