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Novatech 409B Instruction Manual

171 mhz 4-channel signal generator
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INSTRUMENTS
INSTRUCTION MANUAL
Model 409B 171 MHz 4-Channel Signal Generator
Model 409B
Table of Contents
Section
Page
Contents
1.0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 . . . . . . . . . . . . . . . . . . . . . . . . . Description
2.0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 . . . . . . . . . . . . . . . . . . . . . . . Specifications
3.0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 . . . . . . . . . . . . . . . . . Hardware Installation
4.0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 . . . . . . . . . . . . . . . . . . . . . . . . . . .Operation
5.0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 . . . . . . . . . . . . . . . . . . Theory of Operation
6.0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 . . . . . . . . . . . . . . . . . . . . .Performance Test
7.0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 . . . . . . . . . . . . . . . . . . . . . . . . . .Calibration
8.0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 . . . . . . . . Appendix A: Table Mode Details
9.0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12 . . . . . . . . Appendix B: External Reference
--. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13 . . . . . . . . . . . . . . . . . . . . . . . . . . . Warranty
NOVATECH INSTRUMENTS
1
409B Manual, 17-Apr-2015

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  • Page 1 INSTRUMENTS INSTRUCTION MANUAL Model 409B 171 MHz 4-Channel Signal Generator Model 409B Table of Contents Section Page Contents 1.0 ......2 ......Description 2.0 .

  • Page 2: Description

    LEVEL: 0.2 to 0.5 Vrms Sine or Square Wave. 50 Ω. FREQUENCY: 10 MHz to 125 MHz with multiplier of 4 to 1.2 The 409B can also be used with an External 20 enabled. Direct input of 1 MHz to 500 MHz.
  • Page 3 9-pin female RS232 connector 3.7 The “B” command can cause erroneous opera- on the rear panel of the 409B. If you are using a PC, tion and must be used with care. Contact Novatech a 9-pin monitor extension cable used as an RS232 Instruments, Inc.
  • Page 4 Kp and the addition of external filtering of output. (Do not use this command if the /R option is installed) Reset. This command resets the 409B. EEPROM data is preserved and, if valid, is used upon restart. This is the same as cycling power.

  • Page 5: Specifications

    3.11 Signal Outputs. There are four signal outputs ;115.2kBaud Kb 0a on the 409B labelled 0 to 3 on the front panel BNCs. 4.7 If you are using an external clock, the value sent These correspond to channels F0 through F3, and to the 409B in the “Fn”...

  • Page 6: Operation

    2.02x10 gram in Figure 3 for the following discussion. NOTE: 5.2 At every cycle of the 409B master clock, the 32- The “B” command can be used to test AD9959 DDS bit DDS integrated circuit increments the phase of chip programming as it allows access to all internal an internal register by a value determined by the fre- registers.
  • Page 7 (CSR); “BC0000”, function register 1 (FR1); “0000”, function register 2 (FR2); “6102”, internal µC control registers; “21”, software revision as x.y, Rev 2.1 in this example. Consult the Analog Devices AD9959 data sheet for meaning of registers. Each line is terminated by a carriage return/line feed (CRLF) pair. NOVATECH INSTRUMENTS 409B Manual, 17-Apr-2015...
  • Page 8 NOTE: Where: = 28,633,115.306666667 Hz (int.) clock = Binary value in DDS IC. Allow the 409B to warm up for at least 15 minutes setting before performing any measurements. For best ranges from 0 to 2 setting results, the 409B should be verified in its installed Kp = PLL Multiplier (1 or 4 to 20) environment.

  • Page 9: Performance Test

    Be careful not to unduly reading. flex the connecting wires. 6.7 Set the 409B to the values of Table 4. Verify that 7.3 The adjustments shown are set to 1/2 the speci- the oscilloscope amplitude reading remains within fication values.
  • Page 10 16 averages. Set for 50 Ω termination. Set the output to 35 MHz by sending the command “F0 35.0000000”. Adjust R22 for 1.00 Vpp ±0.075 Vpp. This completes the cali- bration of the Model 409B. NOVATECH INSTRUMENTS 409B Manual, 17-Apr-2015...
  • Page 11 8.5 The current values stored in RAM can be read 8.3 The command sequence (bold) is of this form back by the “Dn aaaa” command. N=0 or 1 and (comments after the ‘;’ are not sent to the 409B, but “aaaa” is the address. are here for explanation purposes): 8.6 The RAM table is backed-up by a “supercap”...
  • Page 12 9.2 The external clock input on the 409B series is changed to accept 10.00 MHz. A reference input signal is automatically detected and, if within a lock range of approximately ±5ppm, it is locked to and...

  • Page 13: Warranty

    This warranty is limited to replacing or repairing defective instruments that have been returned by purchaser, at the purchaser's expense, to NOVATECH INSTRUMENTS and that have not been subjected to misuse, neglect, improper installation, repair alteration or accident. NOVATECH INSTRUMENTS shall have the sole right to final determination regarding the existence and cause of a defect.

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