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PERFORMANCE
TESTS
MODEL
8559A
PERFORMANCE TESTS
4
-
24.
SWEEP
TlME
ACCURACY
SPECIFICATION:
There are 20 selectable and calibrated sweep times in a 1
-
2
-
5 sequence from 2 pec/DIV to 10 sec/DIV
(excluding 2 sec/DIV)
.
Sweep time accuracy:
+
10%
(
f
20% for
5
and 10 sec/DIV)
DESCRIPTION:
For SWEEP
TIME/DIV control settings of 10 msec and less, the triangle
-
wave output of a function generator
is used to modulate a
100-MHz signal applied to the spectrum analyzer input. This signal is demodulated in zero
span, displaying a triangular waveform on the CRT. The function genertor is tuned to align the waveform with
the vertical CRT graticule lines. The period of the function generator output is then measured with a counter to
determine the sweep time.
For SWEEP
TIME/DIV control settings of 20 msec and greater, the display (AUX
B)
PENLIFT/BLANKING
output is connected directly to the counter. The blanking signal is
"
low
"
during a spectrum analyzer sweep; the
time interval between the falling and rising edges is measured to determine the sweep speed.
ELECTRIC
COUNTER
FUNCT
l ON
QENERATOR
I
I
BNC
TEE
SIGNAL GENERATOR
l
NPUT
I
AM
SPECTRUM
ANALYZER
i
I
I
AUX PEN1 B
l
FTl
BLANK
l
NG
RF
I
OUTPUT
RQ 2141U CABLE
FIGURE
4
-
19.
SWEEP
TlME
ACCURACY
TEST
SETUP
EQUIPMENT:
.........................................................
Signal Generator HP 8640B
FunctionGenerator
......................................................
HP3310A
..........................................
50 MHz Universal Counter
HP
5300B/5302A
BNCTee
............................................................
HP1250-0781
..........................
Cable Assembly RG-214/U with Type N Connectors
HP 1
15WA