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Variable Motor Driven

Coaxial Motor Driven Variable Attenuators

Continuously Variable Motor Driven Attenuators

ATM manufactures a line of Motor Driven CVA Attenuators to compliment our wide variety of Continuously Variable Attenuators.

DC driven motors with integrated, long life gear reductions create reliable, motor driven variable attenuators for use in your next project.

Please call us with your requirements and discuss your needs with one of our design engineers.

Note: "CVA" is used to mean: Continuously Variable Attenuator.

Motor Driven Continuously Variable Coaxial Attenuators
Motor Driven Continuously Variable Coaxial Attenuator
AV06 CVA mounted to a motor drive
Motor Drive Outline Drawings:  06 Series, 07 Series, 08 Series
GENERAL SPECIFICATIONS
( MOTOR DRIVE UNIT ONLY)

Electrical
Motor Drive Connector: 9-Pin D-Sub (male)
Voltage: 18-30VDC
Max. Amperage: 250mA & 600mA starting
Mechanical
Body: Aluminum Construction
Operating Temp:
Finish: Unique corrosion resistant 316 stainless steel epoxy coating IAW MIL-F-14072
  • ATM's motor driven variable attenuators utilize DC motors with integrated, long life gear reductions ideal for High Reliability applications.
  • The unit will operate with a set DC voltage between 18-30VDC, commonly found in most systems or by a separate DC power supply. Motor speed will vary based on Voltage used. Maximum running current is 250mA & 600mA max starting.
  • To prevent motor damage, Micro switches are used to stop the motor at the minimum and maximum travel positions
  • Units are provided with 9 pin D Sub Male connectors allowing for control voltage, end point indication if desired, and follower potentiometer. See connector pin-out.
  • These devices are best controlled by an external Double-Pole/Double-Throw (DPDT) switch or ATM optional control module described below.
  • Any one of ATM's Continuously Variable Attenuators can be mounted to a motor drive.
  • For Motor Drive Option add -28 to any of the 06 Series, 07 Series, 08 Series, Medium, & High Power attenuators
    Example: AF064-10 = AF064-10-28
Motor Characteristics:

1. Motor Control Voltage
Pins 2 and 7 of the nine pin D Sub male connector will have fixed DC voltage between 18-30 volts applied.  To increase attenuation pin 2 is - and pin 7 is +.  To reverse the direction 2 is + and 7 is -.  In both directions a stop is provided by means of Micro switches.

2. End Point Indicator *
The switch is also used to provide end point indication by means of pins 1 and 6 developing a voltage when the device has reached the maximum limit, (for 2+ and 7-). Pins will 3 and 8 will develop a voltage when a minimum limit is met. (for 2- and 7+). The developing voltage is equal to supply voltage used.

3. Follower Potentiometer **
A 10K Pot with an output proportional to the position of the motor drive mechanism is available at pins 4, 5, and 9.
Motor Pin-Out
Pin Out Configuration
Pin # Function
- 2 Increase Attenuation
+ 7
+ 2 Decrease Attenuation
- 7
+ 1 * End Point Indicator
(Max.)
   6
- 3 * End Point Indicator
(Min.)
   8
** 10K Follower Potentiometer
4 Pot End Points
9
5 Wiper
ATM Optional Control Module:

An External Drive Module part number MCM-001 shown at right, is available for the motor drive as an optional accessory. It includes:
1.  Crisp tactile switches to control drive.
2.  Max/Min position indicator lights.
3.  Follower potentiometer terminals.
4.  Self-switching power supply with input of 120 VAC - 240VAC.*
5.  6 Ft, 9 pin cable to interconnect the control box to the motor driven device.
*If supplied power source is not used, an input of 18-30 VDC through the 9 pin connector may be substituted.

ATM Control Module for Motor Driven Continuously Variable Attenuators(Click For Outline PDF)