NOVATECH INSTRUMENTS
4210 198th St. SW #204
Lynnwood, WA 98036
USA
2940A Manual Rev 1.0
http://www.novatechsales.com/
INSTRUMENTS, INC.
2940A DIRECT DIGITAL SYNTHESIZER
Instruction Manual
SECTION 1: INTRODUCTION
The Model 2940A can produce sinewave ouputs from 200kHz to 399.999999MHz in 1Hz steps. It has an
LCD display, rear mounted computer serial interface and front panel controls. The LCD display and
computer interface controls operate as independent units. The 2940A has two programmable frequen-
cies, “Fa” (top line of display) and “Fb” (bottom line of display), and two front mounted BNC output
connectors: one for the “A” frequency and one for the “B” frequency. There is also a BNC connector on
the rear panel that accepts an external reference input. Both the A and B frequencies will lock to the
external reference automatically if it is present.
The remote computer interface has priority and will automatically place the instrument in Remote Mode
if a valid command is received over the serial port.
SECTION 2: OPERATING INSTRUCTIONS
The user can use the computer interface or the the front panel controls to set the output frequency. When
using the front panel controls the user should depress a cursor button to move the underline character to
the number you would like to change and then use the rotary knob to change the number.
Note 1:
The attenuation setting of 00 on the 2940A display to the right of the frequencies
are always present but are not functional.
Depressing the 2940A front panel MENU button allows the user to scroll through the available Instru-
ment settings and select a parameter for each setting. The MENU settings and parameters to select are:
Setting 1: Serial Baud Rate. Parameters: 300, 600, 1200, 2400, 4800, 9600 or 19200)
Setting 2: Remote Echo. Parameters: On or Off.
Setting 3: User Interface. Parameters: Local or Remote (Serial Port)
Setting 4: Power Up Mode. Parameters: Save (Current) Settings or Use Defaults.
Setting 5: External Standard. Parameters: Disabled, 1, 2, 5., 10, 1.544 or 2.048 MHz.
Note 2:
It is recommended to only set the External Standard to Disabled or to 10. The set-
tings of 1, 2, 5, 1.544 and 2.048 are not tested and may not work.
