Appendix E, ALPHABETICAL LISTING OF COMMANDS
E-20
The lowest five bits in n
2
control the other RS232 parameters according to the
following table:
bit number bit negated bit asserted
0 data = 7 bits data = 8 bits
1 no parity bit 1 parity bit
2 even parity odd parity
3 echo disabled echo enabled
4 prompt disabled prompt enabled
RT[.] Ratio output
In integer mode the RT command reports a number equivalent to 1000×X/ADC1
where X is the value that would be returned by the X command and ADC1 is the
value that would be returned by the ADC1 command.
In floating point mode the RT. command reports a number equivalent to X/ADC1.
SEN [n]
SEN. Full-scale sensitivity control
The value of n sets the full-scale sensitivity according to the following table,
depending on the setting of the IMODE control:
n full-scale sensitivity
IMODE=0 IMODE=1 IMODE=2
3 10 nV 10 fA n/a
4 20 nV 20 fA n/a
5 50 nV 50 fA n/a
6 100 nV 100 fA n/a
7 200 nV 200 fA 2 fA
8 500 nV 500 fA 5 fA
9 1 µV 1 pA 10 fA
10 2 µV 2 pA 20 fA
11 5 µV 5 pA 50 fA
12 10 µV 10 pA 100 fA
13 20 µV 20 pA 200 fA
14 50 µV 50 pA 500 fA
15 100 µV 100 pA 1 pA
16 200 µV 200 pA 2 pA
17 500 µV 500 pA 5 pA
18 1 mV 1 nA 10 pA
19 2 mV 2 nA 20 pA
20 5 mV 5 nA 50 pA
21 10 mV 10 nA 100 pA
22 20 mV 20 nA 200 pA
23 50 mV 50 nA 500 pA
24 100 mV 100 nA 1 nA
25 200 mV 200 nA 2 nA
26 500 mV 500 nA 5 nA
27 1 V 1 µA 10 nA
Floating point mode can only be used for reading the sensitivity, which is reported in
volts or amps. For example, if IMODE = 0 and the sensitivity is 1 mV the command
SEN would report 18 and the command SEN. would report +1.0E-03. If IMODE was
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