Giga-tronics 8003, Руководство по эксплуатации

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8003 Precision Scalar Analyzer
2-92 Manual 20791, Rev. C, June 2001
2.11.5 Cursor Delta (
∆
) Functions
The 8003 Analyzer can make relative level and frequency measurements using the Cursor Delta
function. To make a relative measurement, first place the Cursor at the desired reference point. Then
press the [
CURSOR
∆
ON/OFF ] softkey to toggle the Cursor Delta function on (ON should be in light
blue). A small triangle (
∆
) appears right on top of the Cursor ‘+’ symbol. This is the cursor delta marker.
The active entry area shows 0 dB relative level and 0 kHz relative frequency. This information is
repeated in the channel summary area for the active channel, and in the cursor frequency area at the
bottom of the screen.
Now use the spin knob to move the cursor away from the cursor delta marker and notice that the
relative level and frequency are indicated in the active entry area. You can also use the numeric entry
keypad to enter an exact frequency offset from the cursor delta marker. In Figure 2-48, the cursor delta
function finds the next worst return loss point for this device.
Figure 2-48: Cursor Delta Indicates Relative Level & Frequency (Next Worse Return Loss
Point)
CH2:SW B -PC CSR -0.91 dB
10 dB/ REF -0.00 dB
∆
CURSOR
STRT -2.000 GHz
∆
CSR -1.113 GHz
STOP 8.400 GHz
2
CRSR -0.91 dB
1.113 GHz
∆
CH2 - FILTER RETURN LOSS
CURSOR
ON/OFF
∆
SEARCH
CURSOR
ON/OFF
CURSOR
FREQ
CURSOR ->
MRKR N
DEFINE
MRKR N
REF ->
CURSOR
∆
+