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Measurements
4–12
1780R-Series Operator’s Manual
Simultaneous Diff Phase & Diff Gain Measurements
Enter DP & DG Mode
Push the MEASURE button to enable the Measurement menu,
shown in Figure 4–1.
Touch <DP & DG> on the screen to enable simultaneous differential
phase and differential gain measurements.
The DP & DG menu is displayed on the left CRT, and the demodu-
lated sweep is displayed on the right CRT. See Figure 4–4.
The instrument is now configured as specified in Table 4–3.
Exit DP & DG Mode
To exit DP & DG mode, push the MEASURE button again. All
instrument settings return to previous state.
Horizontal positions, vertical positions, and gain settings defined
while in DP & DG mode will be stored when exiting, and reinstated
when this mode is selected again.
DP & DG Menu Selections
Noise Reduction. Touch <NOISE REDUCTION> to toggle between
<ON> and <OFF>. When noise reduction is off, the demodulator
output (500 kHz BW) is directly displayed. When noise reduction is
on, noise reduction of about 10–12 dB is accomplished without any
reduction in bandwidth.
Freeze. To capture the display (right CRT only), touch <NOISE
REDUCTION> so that <ON> is outlined, then touch <FREEZE>.
<FREEZE> will be outlined.
The captured display remains on the screen even if the input signal is
removed. The display is lost when the DP & DG menu is exited by
any method, including pushing any of the four front-panel menu
buttons, pushing the front-panel LINE SELECT button to enter Line
Select mode, changing the selected line if already in Line Select
mode, or turning instrument power off.
To exit Freeze mode, touch <FREEZE> again.
Measurements
4–12
1780R-Series Operator’s Manual
Simultaneous Diff Phase & Diff Gain Measurements
Enter DP & DG Mode
Push the MEASURE button to enable the Measurement menu,
shown in Figure 4–1.
Touch <DP & DG> on the screen to enable simultaneous differential
phase and differential gain measurements.
The DP & DG menu is displayed on the left CRT, and the demodu-
lated sweep is displayed on the right CRT. See Figure 4–4.
The instrument is now configured as specified in Table 4–3.
Exit DP & DG Mode
To exit DP & DG mode, push the MEASURE button again. All
instrument settings return to previous state.
Horizontal positions, vertical positions, and gain settings defined
while in DP & DG mode will be stored when exiting, and reinstated
when this mode is selected again.
DP & DG Menu Selections
Noise Reduction. Touch <NOISE REDUCTION> to toggle between
<ON> and <OFF>. When noise reduction is off, the demodulator
output (500 kHz BW) is directly displayed. When noise reduction is
on, noise reduction of about 10–12 dB is accomplished without any
reduction in bandwidth.
Freeze. To capture the display (right CRT only), touch <NOISE
REDUCTION> so that <ON> is outlined, then touch <FREEZE>.
<FREEZE> will be outlined.
The captured display remains on the screen even if the input signal is
removed. The display is lost when the DP & DG menu is exited by
any method, including pushing any of the four front-panel menu
buttons, pushing the front-panel LINE SELECT button to enter Line
Select mode, changing the selected line if already in Line Select
mode, or turning instrument power off.
To exit Freeze mode, touch <FREEZE> again.