eg: sends
T\0x06\0x05
for 65C
U
read the USB supply voltage.
eg: returns
U\0x06\0x9d
C
read the collector voltage (12 bit value)
X
read the emitter voltage (12 bit value)
V
read the 48 volt input supply voltage.
eg: returns
V\0x00\0xd6
H
set high current range for base output
h
set low current range for base output
G
perform a high current source measurement
Enables output voltage, measures resultant current.
g
perform a high current sink measurement
Enables output voltage, measures resultant current.
L
turn the analysis LED on
l
turn the analysis LED off
Notes
Setting external voltages accurately relies on a y=Mx+B correction in the calibration memory. Operating the
calibration control panel and observing the message traffic, we obtain the following messages for various outputs:
Collector Voltage
10V
D 404
20V
D 1451
40V
D 3544
Emitter Voltage
10V
S 404
20V
S 1458
40V
S 3565
Base Voltage
10V
B 1090
20V
B 1828
40V
B 3304
Example:
h
Set low current range for base output
v
set Base drive mode to ’voltage’
b 0
set Sink current to zero
B 1090
set Base output voltage to 10V
The exact values of these messages depend on the calibration of the hardware and will vary between different
CTR-201 units. Determining these values on your hardware gives the relationship between the command value
and the output voltage.
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