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Chapter 6, COMPUTER OPERATION
6.7 Command Descriptions
6.7.01 Signal Channel
IMODE [n]
VMODE [n]
CP [n]
6-10
appending a . (full stop) character to the end of the command and before the
parameters. This allows some parameters to be entered or read in floating point
format. The floating point output format is given below.
±1.234E±01
The number of digits between the decimal point and the exponent varies depending
on the number but is a minimum of one and a maximum of eight. The input format is
not as strict but if a decimal point is used there must be a digit before it. An exponent
is optional. The following are all legal commands for setting the oscillator frequency
to 100.1 Hz:-
OF. 100.1
OF. 1.001E2
OF. +1.001E+02
OF. 1001E-1
This section lists the commands in logical groups, so that, for example, all
commands associated with setting controls which affect the signal channel are shown
together. Appendix G gives the same list of commands but in alphabetical order.
Current/Voltage mode input selector
The value of n sets the input mode according to the following table
n
Input mode
0
Current mode off - voltage mode input enabled
1
High bandwidth current mode enabled - connect signal to B/I input connector
2
Low noise current mode enabled - connect signal to B/I input connector
If n = 0 then the input configuration is determined by the VMODE command.
If n > 0 then current mode is enabled irrespective of the VMODE setting.
Voltage input configuration
The value of n sets up the input configuration according to the following table:
n
Input configuration
0
Both inputs grounded (test mode)
1
A input only (remote connection unit)
2
-B input only (remote connection unit)
3
A-B differential mode (remote connection unit)
4
AUX input (main console)
Note that the IMODE command takes precedence over the VMODE command.
Input connector coupling mode control
The value of n sets the input coupling mode according to the following table:
n
Coupling mode
0
Fast
1
Slow
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