
A
3
C
1
Model 930 Programmable Current Source
http://www.calex.com
2401 Stanwell Drive
Concord, CA 94520-4841
(510) 687-4411 Fax (510) 687-3333
Mounting Kits
The Model MK 296 and MK 296HP Mounting Kits are for
resistive or voltage programming of the Model 930. The MK
296HP is a high current version with a power transistor to
increase the range to 0.5A. The Model MK 298 allows
adjustment of the “l(fā)ive zero” for 4 to 20 mA systems. All three
mounting kits consist of the PC board, PC connector with
built-in guides, and the necessary potentiometers. When
ordered with the Model 930 the unit will be delivered mounted.
They can be plugged into the 22-100MK Power Source Kit
(page F2) or used with any of the CALEX supplies or DC/DC
Converters.
For the MK 298 the output current can be programmed for
input voltages other than 0 to 10 Volts by changing the value
of RS.
The formula for RS is:
RS = V
in
(max)
10
Ι
0
(max)
Where: V
in
(max) = max programming (input) voltage
Ι
0
= max output current
Note: +V
S
must be a regulated (0.1% or better) source, and
be 14 Volts to 24 Volts.
To Calibrate: repeat as necessary
1. With the max V
in
adjust the span pot. for max
Ι
out
2. With min V
in
adjust the zero pot. for min
Ι
out
Model 930/MK296HP
Model 930/MK296
Model 930/MK298
Mounting Kit Model 930/MK298
Mounting Kit Model 930/MK296HP
For Voltage Programming