Can I generate a Multitone signal with 10 Hz spacing when using the N8267A PSG and the M8190A Arb?
What conditions should I watch out for?
Normally the tone spacing property lower limit is 100 Hz. However, It is possible manually lower it to 10 Hz.
Under 1. Basic settings
set the ALC state to Off
Under 3. Waveform settings
set Sample Rate Calculation to Manual
set Sample Rate to 144 MHz, Minimum Sample rate is 125 MHz for M8190A.
set Waveform Size to 14400000, Yes that is 14 million points. Must be a multiple of 48 points.
Under 2. Signal settings
set Tone Spacing to 10 Hz
N7621B configuration for 10 Hz Spacing
Getting 10 Hz tone spacing with the PSG and the M8190A Arb requires the following considerations:
Depending on the signal bandwidth the PSG ALC may not work as expected. This is why it was turned off.
The minimal tone spacing is derived from the following equation
F = Sample Rate / Waveform Size
In this case 10 Hz = 144 MHz / 14400000.
The sample rate range for the M8190A is 125 MHz to 8 GHz in 14 bit mode.
The waveform size range is 240 points to over a Gigapoints and must be an integer multiple of 48 points.
You will need to use the 64 bit version of the N7621B application running on a 64 bit OS.
The PC will need lots of RAM, more than 8 GBytes, 16 GBytes is good.
The maximum signal bandwidth possible is about 0.8 * Sample Rate.
In this case about 115 MHz = 0.8 * 144 MHz
The Multitone app supports a maximum of 4097 tones so with a 10 Hz spacing the signal bandwidth is about 40 kHz.
To increase the signal bandwidth, disable the Update Signal Bandwidth Automatically setting. Now the frequencies of the tones in the tone table may be set to any value less than +-57 MHz (115 MHz/2) with a 10 Hz resolution.
Finally there are no anti-aliasing filters in the M8190A Arb. This means that alias signals from the DAC can be present at the RF output.
The 9 tones at 10 GHz generated by the PSG and M8190A Arb
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