HP 8167A, Руководство пользователя, Страница: 123 / 262

6
Example 5 - Increased Tuning Linearity
18 pm, which is larger than the 1 pm tolerance allowed in this example . The
measured wavelength reading is therefore sent to the TLS using the HP-IB
command WAVEACT .
The TLS will now detune itself to reduce the dierence . The new wavelength
is read with the wavelength meter , and the correction loop repeated until the
dierence is reduced to the allowed tolerance . Once the correct wavelength is
achieved, the receiver can be read.
This process is repeated for each wavelength in the sweep (Figure 6-3 ).
Figure 6-3.
Flow chart describing Increased Tuning Linearity program.
In this example , the allowed wavelength dierence is 1 pm, that is the minimum
achievable on the TLS. This will typically take several cycles through the
correction loop . Allowing a larger tolerance will reduce the average number of
correction cycles and overall test time .
Programming Examples 6-13