Page 1: Table Of Contents
INSTRUMENTS INSTRUCTION MANUAL Model 409C, 171 MHz, 4-Channel Signal Generator Model 409C Table of Contents Section Page Contents Description Specifications Hardware Installation Tables 2, 3 & 4 Serial Commands 5, 6 & 7 Operating Instructions Theory of Operation Performance Test...
Page 2: Description
USB serial port or by executing rows saved in pendent, phase-synchronous sine wave output signals, the 409C table. All outputs and other settings can be which can be set from 0.0 Hz (DC) to 171 MHz in 0.1 saved in non-volatile memory.
Page 3: Hardware Installation
/RS232 option, there is a DE9 connector with data tensive filtering is used internal to the 409C, a quiet and TO the 409C on pin 3; data FROM the 409C is on pin 2 well regulated power supply will ensure optimum perfor- and the COMMON return on pin 5.
Page 4 Firmware version: 1.6 3.8 Query Command. The Q command returns the pre- sent state of the 409C non-volatile parameters. See Ta- bles 2 and 3 for a description of each of the parameters. An example of the data returned by the Q command is as...
Page 5: Tables 2, 3 & 4 Serial Commands
Serial Echo control. x=d for Echo Disable, x=e for Echo Enable Reset. This command resets the 409C to the same state as after power-up or cycling power, except the baud rate remains unchanged (cycling power will reset the baud rate to 115.2KBaud).
Page 6 Trigger a sweep from connector J8 by sending the command pp0 x and then apply rising and falling 3.3 NOTE: Sweep time is 50MHz/10Hz per step = volt signals to J8 pin 5. 5,000,000 steps times 2 mS/step = 10 seconds. NOVATECH INSTRUMENTS 409C Manual Rev 1.12...
Page 7 RAM to flash memory. You must use the TSAVE command to save to RAM. If the optional ’x’ parameter is included it causes the table to go to row x. TCLEAR Clear Table Command. Resets all table rows in the table flash memory to the empty state. NOVATECH INSTRUMENTS 409C Manual Rev 1.12...
Page 8: Operating Instructions
3.10 Rack Mounting. An optional 1U rack adapter is Even when Echo is disabled, the 409C will respond with available for mounting up to four 409C into a rack panel. an “OK” for a correctly received data command. 4.6 Baud Rate. A special command, “Kb x”, is availa- 4.0 OPERATING INSTRUCTIONS...
Page 9 Selects Internal Clock. The Synthesizer Clock is the Internal TCXO oscillator stepped up by the AD9959 clock mul pli- er. The clock mul plier is automa cally set by 409C microcontroller ﬁrmware. (When Op on /R is NOT installed ) Selects Internal Clock.
Page 10 32.7675 milliseconds. and y parameters then the active rows are from row x to row y and the 409C will step through the table from x to 4.15 Table Data Entry. The T command along with the y continuously (TRNG) or one time (TONCE).
Page 11 See Section 9 for detailed instructions. cy step size is set by the ‘SWRSFn xxx.xxxxxxx’ com- 4.20 Frequency Sweeping. 409C Models with firmware mand and the ramp down frequency step size is set by version 1.6 or higher have a sweep feature that enables the ‘SWFSFn xxx.xxxxxxx’...
Page 12: Theory Of Operation
Block Diagram below for the following discussion. connector J8. See example on page 6. 5.2 DDS. At every cycle of the 409C system clock, the 4.24 Sweep Default Settings. The default sweep set- AD9959 integrated circuit increments the phase of an...
Page 13: Performance Test
400 MHz Novatech Instruments stable environment of 18-28 NOTE: Allow the 409C to warm up for at least 15 minutes before performing any measurements. For best results, the 409C Table 7: Frequency Test Points should be verified in its installed environment.
Page 14: Calibration
Verification. Note the voltage reading. 8.2 A 10MHz reference must be connected to the rear 6.7 Set the 409C to the values of Table 7. Verify that the panel BNC connector labeled 10MHz input. See para- oscilloscope amplitude reading remains within ±3dB graph 2.5 for the required specs of this signal.
Page 15 500MHz and functons enabled it functions just like the “TS” serial command. identically to that of the REF IN BNC on a 409C that If a table is not running and the TS input is enabled, then does not have option /R installed.
Page 16: Warranty
This warranty is limited to replacing or repairing defec ve instruments that have been returned by purchaser, at the purchaser's expense, to NOVATECH INSTRUMENTS and that have not been subjected to mis- use, neglect, improper installa on, repair altera on or accident. NOVATECH INSTRUMENTS shall have the sole right to ﬁnal determina on regarding the existence and cause of a defect.