Bk-precision 9171-9174 - Manual User Manual download pdf (Page 85)

WARNING:

The terminals for external analog control of voltage and

current have no input protection. Therefore take

caution when connecting to a DC source or a

resistance. For voltage source control, do not input a

voltage outside of the range -0.7 V to 5.7 V for the 0-5 V

scale, or -0.7 V to 10.7 V for 0-10 V scale. This will

damage the supply. For resistance control, do not

connect with resistance greater than 5 kΩ. Doing so

may damage the instrument and cause it to go out of

calibration.

WARNING:

External analog control inputs do not have reverse

polarity protection. Therefore, for external voltage

control, do not connect to a live DC source until

verifying that the positive side is connected properly to

the (+) terminal and negative side to the (-) terminal for

both current and voltage. Never short the (+) and (-)

terminals together as it may damage the instrument.

Voltage Control

You can select the voltage control scale between 0 – 5 V or 0 – 10 V,

with 5 V and 10 V setting the maximum voltage/current output

respectively, and 0 V being the minimum voltage/current output,

which is 0 V/0 A(The scale factor is linear to the full scale

voltage/current output). With model 9172 (rated 35V/3A, 70V/1.5A)

as an example, using the 0 – 10 V scale and applying 0 V input for V

will output 0 V. Applying 10 V input for V will output 35 V or 70 V

depending on the range. Likewise, 10 V for I will set current to 3A or

1.5 A depending on the range. See the setup below:

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Bk-precision 9171-9174 - Manual User Manual Page 85