XT2640 Operating Manual
13 July 2016
Page 107 of 187
The AUTO setting should be chosen as shown above; the text shown in each A RANGE button may have a different range
(LO) or (HI) indicated as that shows the actual range selected for the current being passed at that time.
For the FUND setting –
This must be set to AVIONICS as shown above.
For the BANDWIDTH setting –
Except for the Airbus requirements, the AUTO‐TRACK setting should be chosen as shown above; the text shown in the
button may have a different frequency indicated as this depends on the actual measured frequency at the time of each test.
For the Airbus requirements a 300kHz fixed frequency bandwidth limit setting should be set using the USER choice and
setting 300kHz as the limit.
For the HARMONICS setting ‐
For DO‐160E/F/G a setting of 40 should be chosen as shown above.
For 787B3‐0147 a setting of 62 should be chosen.
For the Airbus requirements a setting of 500 should be chosen (the XT2640 will automatically limit the actual number of
harmonics to ≤150kHz as required in the Airbus requirements because of the 300kHz BANDWIDTH setting used).
20.2.2
AC
1
‐
PHASE
SUPPLIES
For the A RANGE setting –
For SD, AD or WD channels it will be as shown above. This will not be shown if using SH, AH or WH channels as no setting is
required.
The AUTO setting should be chosen as shown above; the text shown in each A RANGE button may have a different range
(LO) or (HI) indicated as that shows the actual range selected for the current being passed at that time.
For the FUND setting –
This must be set to AVIONICS as shown above.
For the BANDWIDTH setting –
Except for the Airbus requirements, the AUTO‐TRACK setting should be chosen as shown above; the text shown in the
button may have a different frequency indicated as this depends on the actual measured frequency at the time of each test.
For the Airbus requirements a 300kHz fixed frequency bandwidth limit setting should be set by using the USER choice and
setting 300 kHz as the limit.
For the HARMONICS setting ‐
For DO‐160E/F/G and 787B3‐0147 a setting of 40 should be chosen as shown above.
For the Airbus requirements a setting of 500 should be chosen (the XT2640 will automatically limit the actual number of
harmonics to ≤150kHz as required in the Airbus requirements because of the 300kHz BANDWIDTH setting used).
