A
1
CALEX
FaxFACTS:
318
1997
Model 930/MK298 DC Transmitter
http://www.calex.com
2401 Stanwell Drive
Concord, CA 94520-4841
(510) 687-4411 • Fax (510) 687-3333
892KM/039ledoM
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Features
n0 to +10V Input, 4 to 20 mA Output
nWide Supply Range from +14V to +24V
nFast Response 10 µs to Load Step Change
nWell Regulated 10 megohms Output Impedance
n0 to +10V Input, 0 to 20 mA Output with
930/MK296, Reference Page E4
Specifications
Description
The Model 930/MK298 is a DC transmitter that provides an
output current that stays constant with changes in load
impedance. The output voltage will vary as necessary to
maintain the desired value of constant current through the
load. Output current of the Model 930/MK298 is set by means
of a DC voltage. Supply voltage should be regulated to 0.1%
or better. The compliance voltage (maximum output voltage
for highest load impedance) is dependent on the supply
voltage level and is rated at the supply voltage less 5 Volts.
A
2
CALEX
FaxFACTS:
318
1997
Model 930/MK298 DC Transmitter
http://www.calex.com
2401 Stanwell Drive
Concord, CA 94520-4841
(510) 687-4411 • Fax (510) 687-3333
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Mechanical Specifications
The MK298 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 = Vin (max)
10 Ι0 (max)
Where: Vin (max) = max programming (input) voltage
Ι0 = max output current
Note: +VS 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 Vin adjust the span pot. for max Ιout
2. With min Vin adjust the zero pot. for min Ιout
Model 930
Pin Assignments
MOUNTING KIT MODEL 930/MK298
Operation
The Model 930/MK 298 allows adjustment of the “live zero” for
4 to 20 mA systems. The mounting kit consists of the PC
board, PC connector with built-in guides, and the necessary
potentiometers. It can be plugged into the 22-100MK Power
Source Kit (page F2) or used with any of the CALEX power
supplies shown on pages E9 through E14.
