Rf Frequency Sweep; Rf Frequency Sweep; Characteristics - HP 8642A Operation And Calibration Manual

Model 8642A/R
Descrip tion
Operation
RF FREQUENCY SWEEP
Two types of frequency sweep are available. Stepped Frequency Sweep sweeps from a
start end-point to a stop end-point in linearly spaced, incremental steps. Phase
Continuous Frequency Sweep (Special FUllction 123) sweeps from a start end-point to a
stop end-point in a linear, phase continuous manner.
Sweep step size is automatically selected based on the frequency span (which is the
absolute value of the start frequency minus the stop frequency) and the sweep time.
Although step size for the Stepped Frequency Sweep cannot be directly set, this operating
illstruction provides ways to calculate a <;weep t!1I1e
ILl
enable you to select a particular
step size or number of steps
Table 3-12. RF Frequency Sweep Operating Characteristics
Electrical Characteristics Performance Limits Conditions
Digitally Stepped
Frequency Sweep
Range
0.100000 to 1057.500000 MHz' 8642A
0.100000 to 2115.000000 MHz' 86428
Time 275 ms minimum
999s maximum
Phase Continuous
End-points can be outside the
Frequency Sweep band but (Start Frequency
+
Stop Frequency) ;- 2 must be
within the band.
Maxirnurn Sweep Span BOO.OOO kHz (B6428 only) 1057.500001 to 2115.000000 MHz
400.000 kHz 528.750001 to 1057.500000 MHz
200.000 kHz 264.375001 to 528.750000 MHz
100.000 kHz 132.187501 to 264.375000 MHz
50.000 kHz2 66.093751 to 132.187500 MHz
25.000 kHz2 33.046876 to 66.093750 MHz
12.500 kH z 2
16.523438 to 33.046875 MHz
6.250 kHz2
8.261719 to 16.523437 MHz
3.125 kHz2
4.130860 to 8.261718 MHz
25.000 kHz2
0.100000 to 4.130859 MHz
400.000 kHz 0.100000 to 132.187500
MHz~
Time 5 ms rninimum
999s rnaximum
Maximum and minirnum sweep
tirnes are also dependent on
the sweep span and carrier
frequency.
X Axis Output
o
to 10 Vdc ±10%
Z Axis Output TTL Positive True For crt display blanking
during retrace
4
t----
'In AUTO sweep mode. it is not possible to set start and stop end-points if one end-point is less than 4.130860 MHz (band 2)
with a second end-point greater than ,32187500 MHz (band 6). Also, it is not possible to set a sweep across 1057.500000 MHz
(8642B only)
2
Maximum end-point separation may be increased up to that shown for the HET band by selecting a frequency span larger
than the span shown here. HET band can also be selected with Special Function 8
3The HET Band
4 Buffer this output in order to use the Z-axis output with a plotter for pen lift
3-49