det$ = "Probe AD-17"
unit$ = "cps"
CASE 18
det$ = "Probe AD-18"
CASE 19
det$ = "Probe AD-19"
unit$ = "cps"
CASE 20
det$ = "internal GM"
CASE 21
det$ = "AD-t low DR"
CASE 22
det$ = "AD-t high DR"
END SELECT
RETURN
' ---------------------------------------------------------------------
' Handler for transmission errors
' ---------------------------------------------------------------------
RecvErr:
IF ERR = DEVERR THEN PRINT TIME$; " Transmission Error": RESUME MainLoop
ON ERROR GOTO 0
2.2 »Control«
This output switches between the two GM counters in the telescopic probe AD-t, where Control = high
(4.75V) selects the low dose rate GM counter, and Control = low (GND) selects the high dose rate GM
counter. If any other or no probe is connected, Control will always be high.
Certain software versions of the 6150AD (e.g., the Swedish version V-36.04) make additional use of the
Control output: With the AD-t probe, Control will operate as described above. With any other or no probe
the Control output will signal dose rate alarm: Control = high indicates that dose rate alarm is off, and
Control = low indicates that dose rate alarm is on. This allows triggering of external alarming devices.
However, one has to consider that the Control output can only drive very small loads due to its internal
structure:
The microprocessor port can sink only a few mA and can source almost no current, because the high state
is achieved through a weak pull-up resistor of 10-100 kOhms depending on the manufacturer of the
microprocessor. The Control output can therefore only drive high impedance low capacity inputs like
CMOS gates as shown in the drawing above. Such buffering is strongly recommended before connecting
some external device.
micro-
processor
port
1 kOhm
6150AD
4.75V
Control
GND
buffered
output
(e.g. 4049, 4069, 40106)
(inverted)
CMOS gate 4000 series
06/2003
Technical Manual 6150AD Probe Connector
Page 6 of 14
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