1 – 8
Operation
The Chassis Ground and Power Ground are tied together in the in-
more about grounding
strument. The
+
5 V sections use the Power Ground, and the signal
sections of the instrument use the
±
15 V and Signal Ground. The
Signal Ground and Power Ground are tied through protection schot-
tky diodes, and can therefore not be more than
∼ ±
0
.
35 V apart.
These two ground lines should be separately wired back to a single,
low-impedance ground source at the power supply.
1.4.2.2
Serial settings
The serial port settings at power-on are: 9600 baud, 8–bits, no parity,
1 stop bit, and hardware flow control (see Section 2.3.1). The serial
settings cannot be changed on the SIM910.
SIM910
JFET Preamp
