Products > Test Equipment
JunTek PSG9080 Programmable Signal Generator (80 MHz - 300 MSa/s - 14-bit)
radiolistener:
According to my observations, there are 3 voltage bands with the following boundaries (it depends on voltage change direction - up or down):
- up 0.120/0.121 Vpp | down 0.100/0.101 Vpp
- up 0.361/0.362 Vpp | down 0.322/0.321 Vpp
- up 6.001/6.002 Vpp | down 5.602/5.601 Vpp
when you change voltage across these boundaries, some internal switch is changed.
Here is my measurement of output impedance for these voltage bands. Since 0.3-6 Vpp is the most usable band, I performed several measurements for this band. I used oscilloscope Siglent SDS1102X for amplitude measurement, so the result depends on oscilloscope measurement error.
Measurement was performed at 100 kHz frequency with two different loads - 50 Ohm and 1 MOhm. The first voltage value for 1 MOhm load and the second (after slash) for 50 Ohm load.
0.2960 / 0.1480 Vpp => 50.005 Ohm
0.992 / 0.504 Vpp => 48.418 Ohm
2.00 / 1.00 Vpp => 50.000 Ohm
2.96 / 1.49 Vpp => 49.333 Ohm
4.04 / 2.04 Vpp => 49.025 Ohm
4.92 / 2.44 Vpp => 50.825 Ohm
5.96 / 3.00 Vpp => 49.338 Ohm
9.56 / 4.88 Vpp => 47.956 Ohm
As you can see, taking into account oscilloscope precision, the output impedance of PSG9080 is pretty close to 50 Ohm. Very good result :)
electronx:
Do you hear capacitor noise when the device is off and the device is plugged in?
There is a thin capacitor noise when the device is turned off and the sound is gone when I turn it on. I can also hear the capacitor discharge sound when I unplug it while the device is turned off.
radiolistener:
--- Quote from: electronx on September 18, 2020, 02:45:10 pm ---Do you hear capacitor noise when the device is off and the device is plugged in?
--- End quote ---
Yes, when I put my ear on the device case I can hear it.
electronx:
frankly i don't think the power board is well designed. If we examine the mechanical design, it is really bad. The BNC sockets are not fixed, can't they take the devices of good brands as an example? As an electronics engineering student, I can do a much better mechanical design. I measure values in DC mode with a 5.5 digit multimeter. There are voltage differences such as 0.02 Volts. This is really suck. It has voltage fluctuations. It is good that it has an interface design and a large screen compared to its competitors.
I would definitely prefer this over Feelec. but if I had more money, I definitely wouldn't buy it. Even grounding in a plastic case is terrible
radiolistener:
--- Quote from: electronx on September 18, 2020, 04:07:17 pm ---The BNC sockets are not fixed, can't they take the devices of good brands as an example?
--- End quote ---
from my opinion BNC connectors on front panel are good enough. They have good contact. Much better than cheap Chinese BNC that I seen on other devices.
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