User`s manual

3. 7. 5 Po we rin g Ou tpu t 2 Usi ng a n E xte rna l P owe r Su pp ly 39

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3.7.5.4 Programming Voltages Under 10 V

A voltage divider (FIGURE 3-10) can be used to reduce the control output voltage if

the programming input of the power supply has a range of less than 0 V to 10 V to

ens

ure full output resolution, and protection against overloading the external supply

programming inputs. The output voltage is proportional to the ratio of resistors 

R1 to R2: V

out

= 10 V × R1/(R1+R2). It is also important to keep the sum of

R1 + R2 > 1000 ) or the Model 335 output

may not reach the output voltage setting

due to internal overload protection. For a programming input range of 0 V to5 V, rec-

ommended values are: R1 = R2 = 2000 ).

For a programming input range of 0 V to1 V,

recommended values are: R1 = 500 ), R2 = 4500 ). Exact resistor value, type and tol-

erance are generally not important for this application.

Voltage divider circuit for Output 2 (voltage mode)

Model 335

Output 2 +

(voltage mode)

Output 2–

(voltage mode)

Power supply

Program input+

Program input–

FIGURE 3-10