Atec Tektronix-2715 - Manual (Page 4)

2715
Characteristics
Continued
page 4
Absolute Accuracy: ±2.5 dB for visual car-
rier to noise >30 dB (300 kHz RBW); for FM
signals, carrier to noise >33 dB
(100 kHz RBW).
Relative Accuracy: ±0.5 dB relative to adja-
cent channel, ±1.2 dB relative to all others.
Visual-to-Aural Carrier Level Difference –
Difference Range: 0 to 30 dB for aural car-
rier to noise > 15 dB (300 kHz RBW).
Resolution: 0.1 dB.
Accuracy: ±0.75 dB for aural carrier to noise
>15 dB (300 kHz RBW).
Digital Channel Averaged Power –
Averaged amplitude measured with
preamp off.
Amplitude range: –30 dBmV to +37 dBmV
(multi-channel) or –30 dBmV to +52 dBmV
(preselected).
Resolution: 0.1 dB.
Absolute accuracy: ±2.5 dB.
Carrier to Noise –
Default noise floor is a normalized 4 MHz
bandwidth measured relative to the visual
carrier peak.
Range and Accuracy: See Figure 1.
Resolution: 0.3 dB.
Gated, in-service measurement is in-band;
non-gated, in-service measurement is at
guard band below channel boundary.
Digital Channel Desired to Undesired
Ratio –
Channel averaged power is divided by total
noise plus distortion power in the channel.
Range and Accuracy: See Figure 2.
Resolution: 0.3 dB.
Modulation Depth –
% AM measured from sync tip to lowest
white level in 10 sweeps (VITS line used if
defined in channel table).
AM Range: 50% to 95%.
Resolution: 0.1%.
Accuracy: ±2% for visual carrier to noise
>40 dB (300 kHz RBW). Hum/Low-Frequency Disturbance –
Power line frequency measured on an
unmodulated visual carrier and low fre-
quency disturbance measured on the
modulated carrier.
AM Range: 1% to 10% peak-to-peak.
Resolution: 0.1%.
Accuracy: ±1% for hum <5% and visual
carrier to noise >25 dB (300 kHz RBW);
±2% for hum <10% and visual carrier to
noise >25 dB (300 kHz RBW).
Frequency Response –
For fixed-amplitude scrambling or no
scrambling, system amplitude variations
(flatness) are displayed relative to a refer-
ence trace stored during frequency-
response reference setup.
Range: 5 dB/div.
Resolution: 0.2 dB.
Flatness Accuracy: ±0.75 dB.
In-Channel Response –
Expresses maximum variance in amplitude
within some specified frequency range
within a particular channel, given a "flat" test
signal over that same specified range. The
variance is referenced to the average of the
highest and lowest amplitude within the fre-
quency range.
Range: ±3 dB.
Resolution: 0.1 dB.
Accuracy: ±0.5 dB.
Test signal line number must be specified
for in-service measurements.
Digital Channel Adjacent Channel
Leakage –
Averaged power in adjacent channel(s) is
divided by averaged power for the test
channel.
Range and Accuracy: See Figure 3.
Resolution: 0.3 dB.
Carrier Survey –
Absolute peak amplitude of each visual car-
rier is measured and each associated aural
carrier level is measured relative to the visual
carrier for selected channels. Frequency
counted only in ACCUR FREQ/AMPL mode.
Visual Carrier (FREQ/AMPL and ACCUR
AMPL modes)
Amplitude Range: –18 dBmV to
+58.8 dBmV for visual carrier to noise
>30 dB (300 kHz RBW) and total input
power <+70 dBmV.
Frequency Range: 15 MHz to 1015 MHz.
Resolution: 0.1 dB.
Absolute Accuracy: ±2.5 dB for visual
carrier to noise >30 dB (300 kHz RBW);
for FM signals, carrier to noise >33 dB
(100 kHz RBW).
Relative Accuracy: ±0.5 dB relative to
adjacent channel, ±1.2 dB relative to all
others.
Visual Carrier (FAST AMPL mode)
Amplitude Range: –18 dBmV to +58.8
dBmV for carrier to noise >30 dB (300
kHz RBW) and total input power <+70
dBmV.
Frequency Range: 15 MHz to 1015 MHz.
Resolution: 0.3 dB.
Absolute Accuracy: ±2.7 dB for carrier to
noise >30 dB (300 kHz RBW); for FM
signals, carrier to noise >33 dB
(100 kHz RBW).
Relative Accuracy: ±0.8 dB relative to
adjacent carrier; ±1.5 dB relative to all
other channels.
50
45
40
35
30
25
55
MEAS
LIM
(dBc)
-20 -15 -10 -5 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70
Channel Under Test Input Level dBmV
D/U Measurement Range Limits For 2 dB Accuracy
60
To 500 MHz, using preselector.
500 MHz to 1000 MHz, using preselector.
To 500 MHz, in 60 channel flat system dominated
by analog signals 10 dB stronger than average
power of channel under test.
500 MHz to 1000 MHz, in 60 channel flat system
dominated by analog signals 10 dB stronger than
average power of channel under test.
Figure 1.
Figure 2.