Tektronix 492, 492P, Руководство по обслуживанию

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Specification—492/492P Service Vol. I (SN B030000 & up)
Table 1-1 (cont)
Characteristic Performance Requirement
Supplemental Information
Display Dynamic Range 80 dB at 10 dB/Div and 16 dB for 1-9 dB/Div
and
8
divisions for linear mode.
Accuracy ±1.0 dB/10 dB to a maximum cumulative
error of ±2.0 dB over the 80 dB window
and ± 0.4 dB/2 dB to a maximum cumu­
lative error of ±1.0 dB over the 16 dB
window. LIN mode is ± 5% of full screen.
RF Attenuator
Range
0 to 60 dB in 10 dB steps.
Accuracy
3
Dc to 4 GHz Within 0.3 dB/10 dB to a maximum of
0.7 dB over the 60 dB range.
4 GHz to 18 GHz
Within 0.5 dB/10 dB to a maximum of
1.4 dB over the 60 dB range.
IF Gain
Range
93 dB of gain increase, 10 dB of gain
decrease (MIN NOISE activated) in 10 dB
and 1 dB steps.
Accuracy
Gain steps are monotonic (same direction)
with the following limits: Within 0.2 dB/dB
to a maximum of 0.5 dB/9 dB except at
the decade transitions of — 19 to
- 2 0 dBm, - 2 9 to - 3 0 dBm, -3 9 to
—40 dBm, —49 to —50 dBm, —59 to
—60 dBm and —69 to —70 dBm, where
an additional 0.5 dB can occur for a total
of 1.0 dB per decade. Maximum deviation
of the 90 dB range is within ±2 dB.
Differential Amplitude
Measurement
Range
Delta A mode provides differential measure­
ments in 0.25 dB increments
10 dB above to 40 dB below the reference level
established when the delta A mode was
activated.
DO NOT use the delta A mode outside the
— 123 dBm to +30 dBm reference level range.
Accuracy
dB Difference Steps Error
0.25 dB 1 0.05 dB
2 db
8
0.4 dB
10 dB 40 1.0 dB
50 dB 200 2.0 dB
Signal Amplitude Variation
With Resolution Switching Less than 0.5 dB
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■Refer to “ Verification of Tolerance Values” at the beginning of the Performance Check section.
1-8
R E V J U N 1982