Tektronix 492 - Page 17

Specification—492/492P Service Vol. I (SN B030000 & up)
Table 1-1 (cont)
Characteristic
Performance Requirement
Supplemental Information
Frequency Drift after 2 hour
warm up at a fixed frequency
and stable ambient
temperature
«=200 kHz/hour, fundamental mixing.
A re-stabilization time of 10 minutes per GHz
of frequency change must be allowed if the
1st LO frequency is retuned.
"Static" Resolution Band
width (6 dB down)
1 kHz to 1 MHz in decade steps, plus an
automatic (AUTO position). Resolution
bandwidth (6 dB down) is within 20% of
the bandwidth selected.
In AUTO position the bandwidth is computed
by an internal computer, based on the
span/div, video filters, time/div, and
vertical display selections. When both
the TIME/DIV and RESOLUTION BANDWIDTH
are in AUTO position, the resolution
bandwidth is a function of the FREQUENCY
SPAN/DIV selection.
Shape Factor (60 dB/6 dB) 7.5:1 or less.
Noise Sidebands
At least —75 dBc at 30 times the resolu
tion offset for fundamental mixing.
Pulse Stretcher
Fall-Time
30 Ms/division; ±50%.
Video Filter
Narrow
Reduces video bandwidth to approximately
1/300th of the selected resolution bandwidth.
Wide
Reduces video bandwidth to approximately
1 /30th of the selected resolution bandwidth.
Frequency Span/Div
Range (in 1-2-5 sequence)
Band
Narrow
Span
Wide
Span
1—3
(0—7.1 GHz)
10 kHz/Div
200 MHz/Div
4—5
(5.4—21 GHz)
50 kHz/Div
500 MHz/Div
6
(18—26 GHz)
50 kHz/Div 1 GHz/Div
7—8
(26—60 GHz)
100 kHz/Div
2 GHz/Div
9
(60—90 GHz)
200 kHz/Div
2 GHz/Div
10
(90—140 GHz) 500 kHz/Div
5 GHz/Div
11
(140—220 GHz) 500 kHz/Div
10 GHz/Div
Two additional positions provide full band (MAX
span) display or 0 Hz (time domain) display.
Accuracy
Within 5% of the span/div selected over
the center eight divisions of a ten-
division display.
REV NOV 1982
1-5