Operation Model 8642A/B
Data Snput (cont'd)
Exceptions to Flowcharts
Not covered in those flowcharts is frequency sweep's dependence on entry
sequence. Frequency sweeps are coupled to FM and <J>M settings. When selecting
either Digitally Stepped Frequency Sweep or Phase Continuous Frequency Sweep
with either FM or <f>M, use the following sequence:
1.
Turn off frequency sweep (FAOF FBOF).
2.
Select either Special Function 123 (Phase Continuous Frequency Sweep) or
Special Function 223 (Phase Continuous Frequency Sweep Off which enables
the selection of Digitally Stepped Frequency Sweep).
3.
If FM is to be selected, use the FM flow chart (but don't set FM yet, nor FR).
4.
If $M is to be selected, use the $M flow chart (but don't set PM yet, nor FR).
5.
With Start Frequency (FA) or Stop Frequency (FB) active, select the sweep
mode (FASA for auto, FASM for manual, or FASG for single).
6. Select the sweep time setting.
7.
Select either the start or stop frequency setting. (Choose the frequency setting
that is in the band that allows the desired FM or $M setting.)
8. Select the desired FM or <t>M deviation setting.
9. Select either the stop or start frequency setting (whichever of thes which was
not set in step 7.)
Valid
Character
Entry When entering data over HP-IB, the data entry can take the form of:
Implicit point notation (for example, 100 MZ), or
Fixed point notation (for example, 100.0 MZ), or
Exponential notation (for example, 1000E-1 MZ).
Each function has an HP-IB data-entry limit of 10 mantissa digits and 2 exponential
digits (exponential notation is optional). For example, the following entries for 100 MHz
will be accepted:
1000000000E-01 HZ
1000000000E-1 HZ
1000000000E-4 KZ
However, these entries for 100 MHz will not be accepted:
10000000000E-02 HZ (this entry will be accepted as 10 MHz)
1OOOOOOOOE-006 MZ (this entry won't be accepted and could cause problems in
subsequent data entries)
Only the following data inputs are recognized over HP-IB by the Signal Generator; all
other characters are ignored:
A-Z,
a-z (lower-case letters are converted to upper case)
0-9
+ -
Leading zeroes are treated as significant digits.
The space character, carriage return, and line feed are ignored.
3-14
To Next Page
Loading...
Need help?
General
