XT2640 Operating Manual
13 July 2016
Page 113 of 187
o
Any number of VPAs in any number of XT2640s may use each GFUND measurement data (including a VPA within the
same XT2640 which is providing the data).
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A GFUND data cannot be circularly configured, e.g. if VPA1 within a XT2640 is configured to use GFUND1 as its
fundamental then VPA1 within that XT2640 cannot be configured to provide the VPA1 fundamental as GFUND1.
o
If a conflict is discovered in a GFUND data provided by this XT2640 (i.e. another XT2640 is also configured to provide
this data) then the button is colored RED.
You can display a list of the units discovered within the configured multi‐unit group in the OTHER MEMBERS area of the Multi‐
Unit Configuration screen (other than the XT2640 on which it is being displayed). Typically this can take a few seconds to
respond to other XT2640s being taken into or out of service or their multi‐unit configuration being changed. If more than one
other unit is detected then PREV and/or NEXT buttons are provided to scroll between the discovered units. The information
displayed for each discovered unit incudes –
o
The identity name (if any) for that unit.
o
The IP address of that unit.
o
If that unit is configured for SYNC mode measurements.
o
If that unit provides any IN, MID and/or OUT measurement data.
o
If that unit is configured to provide any GFUND measurement data.
21.3
SYNCHRONIZING
MEASUREMENTS
WITHIN
A
GROUP
OF
UNITS
All XT2640s configured within the same Multi‐Unit group number, and are connected to each other, and are configured for SYNC
measurement mode (see 12.4.1) will start their measurements at the same time and another measurement cannot be started until all
such measurements have been completed within all VPAs in all configured units in this manner. See section 22 for further details
regarding this.
Note:
Only units configured to use the SYNC measurement mode are synchronized in this manner.
Other than configuring the required units to use the SYNC measurement mode, no other configuration is necessary to achieve
this capability.
Recommendation:
This capability should only be used when necessary; measurements are generally not continuous when operated in this manner.
Typically this is only useful when units are measuring values which vary considerably over time and even in such situations
typically simply using a faster measurement period and result response averaging is usually recommended.
21.4
HOLDING
AND
RELEASING
MEASUREMENTS
IN
A
GROUP
OF
UNITS
Holding or releasing measurements using the front panel or an interface on any XT2640 within a multi‐unit group affects all units
within that group simultaneously, no configuration is necessary to achieve this capability.
21.5
STARTING,
STOPPING
AND
CONFIGURING
INTEGRATION
IN
A
GROUP
OF
UNITS
Starting and/or stopping integration using the front panel or an interface on any XT2640 within a multi‐unit group affects all units
within that group simultaneously, no configuration is necessary to achieve this capability. The integration configuration of the unit
on which integration was started is automatically used within all such units. See section 15 for details regarding integration.
21.6
STARTING
AND
STOPPING
HISTORICAL
DATA
COLLECTION
IN
A
GROUP
OF
UNITS
Starting and/or stopping historical data collection using the front panel or an interface on any XT2640 within a multi‐unit group
affects all units within that group simultaneously, no configuration is necessary to achieve this capability.
