1250 Frequency Response Analyzer The Sweep Facility
CHFR/1250/2 6-3
6.4 SETTING UP A LOGARITHMIC OR LINEAR SWEEP
1. Press the Generator, Analyzer and Sweep STOP keys.
2. Use the Generator Menu to set the required amplitude, bias, waveform etc. The
Generator frequency need not be altered, as the Sweep controls will over-ride any
existing setting.
3 . Set up the Analyzer Menus.
4. Press SWEEP MENU; four soft keys will be allocated as follows:
FR MIN Enter the required minimum frequency here.
FR MAX Enter the required maximum frequency here.
∆LOG Enter the required number of steps, followed by the chosen log sweep.
∆LIN Enter the required number of steps, followed by the chosen linear
sweep.
5. Press the START/CONTINUE key. Five soft keys will be allocated. The first soft
key, HARMONIC is explained in Section 11. The remaining four keys act in pairs,
one pair for log sweeps and one pair for linear. Each pair controls the direction of its
associated sweep, either upwards or downwards as indicated by the arrows.
Press the key which shows the required direction for the type of sweep selected.
The Sweep Status will change from STOP to IDLE, and also show the type of Sweep
selected, e.g. log up.
6. Press ANALYZER SINGLE if the steps of the sweep are to be executed manually, or
ANALYSER RECYCLE if it is desired to carry out the whole sweep automatically.
The Analyzer Status will change to IDLE.
6.5 EXECUTING THE SWEEP
Press GENERATOR START. The sweep will now commence. If an ↑ key has been
selected, the Generator will first be set to FR MIN and the Analyzer will take a reading at
this frequency. Conversely, if a ↓ key is operative, the first reading will be at FR MAX.
On ANALYZER SINGLE, only this one reading will be taken. To continue the sweep,
successively operate the SINGLE key to step the Generator through the defined range,
with a reading taken at each frequency until the opposite limit is reached.
On ANALYZER RECYCLE, readings are taken automatically, one per step of the
Generator frequency, until the sweep is complete.
6.6 AUTOMATIC SWEEP TIME
With automatic sweeps, only one measurement is made at each frequency. As each
measurement finishes, an "integration complete" signal allows the Generator to step on
to the next frequency. Account is also taken of any Delay that has been entered.
Hence, the time taken to complete an automatic sweep is dependent not only upon the
start and finish frequencies and the number of steps in between, but also on any Delays
programmed and the Integration Time chosen.
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