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Operating Modes
There are five operating modes for the instrument (listed in the following table) of which four may
be selected under digital remote control.
0
Voltage Tracking:
Output V2 tracks V1 at a fixed ratio of 5% to 2000%.
This mode can only be entered if both V1 and V2 are set to >1 volt. The ratio is
automatically set on entry to this mode to match the existing ratio of V2 to V1.
This is the only mode where the ‘RATIO’ and ‘RATIO?’ commands are legal.
1
Single Output:
This is mode reserved for single output power supplies and cannot be set on this
instrument.
2
Dual Output – Tracking Off:
In this mode the two outputs operate fully independently. This is the only mode where
commands that change V2 directly are allowed i.e. ‘V2’, ‘V2V’, ‘DECV2’, ’DECV2V’,
‘INCV2’, ‘INCV2’ and ‘DELTAV2’.
3
Track Voltage and Current (Displaying combined Voltage):
This mode can only be entered if both outputs are off. Once entered it is not possible to set
V2 or I2 or turn the outputs on and off independently. Output 2 will always match output1.
Note: This mode is useful if the outputs have been wired in series.
4
Track Voltage and Current (Displaying combined Current):
This mode can only be entered if both outputs are off. Once entered it is not possible to set
V2 or I2 or turn the outputs on and off independently. Output 2 will always match output1.
Note: This mode is useful if the outputs have been wired in parallel.
-1
Analog control active:
This mode cannot be set but is returned if either output is under analogue control.
Command List
This section lists all commands and queries implemented in this instrument. The commands are
listed in alphabetical order within the function groups.
Note that there are no dependent parameters, coupled parameters, overlapping commands,
expression program data elements or compound command program headers; each command is
completely executed before the next command is started. All commands are sequential and the
operation complete message is generated immediately after execution in all cases.
The following nomenclature is used:
<rmt>
<RESPONSE MESSAGE TERMINATOR>
<nrf>
A number in any format. e.g. 12, 12·00, 1·2e1 and 120e-1 are all accepted as the
number 12. Any number, when received, is converted to the required precision
consistent with the use then rounded up to obtain the value of the command.
<nr1>
A number with no fractional part, i.e. an integer.
<nr2>
A number in fixed point format e.g. 11·52, 0·78 etc.
<n>
The number of the output (1 or 2) or associated status register to which the command
relates. Output 1 is the left-hand output, as marked on the front and rear panels.
