AMETEK XEL Series 60V and below - Manual (Page 22)

The electrical isolation permits the two outputs to be connected to provide, for example, tracking
voltages of opposite polarity or identical voltages connected to different system references (e.g.
digital ground and analog ground).
The LOCK and VOLTAGE SPAN functions of the Master operate exactly as described previously
and, because the output voltage of the Slave tracks the Master, they control the Slave output
voltage as well. Note that only the output voltage of the Slave is ‘locked’ when the Master LOCK
is used; the current controls of the Slave, including the 500mA Range and Meter Average
functions, remain independent.
The LOCK key on the Slave output is ignored and pressing it causes the message In trac to
be shown momentarily in the Slave display as a reminder.
It is possible to switch from Tracking mode back to Independent mode with LOCK still set on the
Master. The ‘Master’ (right-hand output) settings stay ’locked’ but the settings of the left-hand
output, are not locked.
The Voltage Span keys of the Slave have a different function in Tracking mode, see next section.
Isolated Ratio (%) Tracking
Set the MODE switch to ISOLATED TRACKING.
Ratio Tracking is enabled by pressing the
ENABLE key in the Slave VOLTAGE SPAN
section (ENABLE lamp on)
The instrument operates as described above for Tracking mode but the Slave voltage can be set
to a percentage (0% to 101%) of the Master voltage using the Slave Voltage controls. The ratio is
then maintained as the Master voltage is varied.
Pressing ENABLE again returns the Slave to standard Tracking mode (ENABLE lamp off).
Ratio Tracking can only be enabled or disabled with the Slave output off. If the output is on the
display will briefly show the message
turn oFF when ENABLE is pressed and the change will
not be implemented.
Whenever Ratio Tracking mode is enabled the Slave display momentarily shows
Pcnt on
before reverting to show the actual output voltage now set.
The percentage value can be shown at any time by pressing either the V
min
or V
max
key of the
Slave output. With either key held down the Slave display shows the percentage setting in the
form
90.0 Pcnt and the Slave Voltage controls can be used to set the ratio percentage
required. The ratio percentage can be set prior to Ratio Tracking being enabled (ENABLE lamp
off).
The LOCK and VOLTAGE SPAN functions of the Master operate exactly as described previously.
However, with Ratio Tracking enabled, the Slave Voltage controls can still be used to adjust the
ratio percentage of the Slave voltage even though the Master voltage is locked. The Ratio
Tracking mode status at power on is the same as at last power off. See also the Retained Slave
Settings paragraph.
Parallel
The MODE switch is set to PARALLEL. The instrument operates in true parallel mode with all of
the power available from the Master output which can then supply up to 6 amps. The Slave
output is disabled and its displays are turned off.
In Parallel mode the value of the current limit is doubled for the same setting of the Current limit
control, including the 500mA range which becomes 1000mA max; as a warning, when Parallel
mode is first selected, the current display flashes twice before steadily displaying the new limit.
Similarly, the current display is flashed twice when the mode is changed from Parallel to Tracking,
as a warning that the Master output current limit has now halved.
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