Operating Instructions
2–2
1720/1721
There are three push-button switches, located in the INPUT block, that have an
extra function. The extra function is accessed by holding the switch down for
approximately one second. The operating selection reverts to the top of the
listed functions when the push button is repushed to exit this extra function, with
the exception of TEST, which reverts to its original state when exiting.
1. MODE
A momentary push-button switch that toggles between the vector and XY
displays. These two functions have back lighted nomenclature with rectangular
indicators.
Holding this button in switches the MODE to a display of both vector and XY
modes. In this mode both the VECT and XY nomenclature and rectangular
indicators light up to indicate that the 1720/1721 has been switched to this mode
of operation.
2. REF
A momentary push-button switch that toggles between INT and EXT sync
references. These two functions have back lighted nomenclature with rectangu-
lar indicators.
Holding this button in switches the REF to an unlocked display of subcarrier and
enables the V-axis switcher, if a signal containing a subcarrier reference signal is
applied to the selected input. TEST nomenclature, framed by a blue box, lights
up when the 1720/1721 is switched to this mode.
3. CH–A CH–B
Momentary contact push-button switch that toggles the input between Channels
A and B. Back lighted nomenclature, with rectangular indicators, light to show
which is selected for display.
Holding this button in switches the INPUT to a display of both A and B Inputs.
This display requires an external sync reference. Both the CH-A and CH-B
indicators light when the 1720/1721 has been switched to this dual input mode.
4. VARIABLE
A momentary contact push-button switch that toggles between VARIABLE gain
ON and off. The VARIABLE control adjusts amplifier input gain so that any
input signal between 0.5 V and 2.0 V peak-to-peak can be displayed. Control
has no detent, action is continuous. Back lighted nomenclature, with rectangular
indicators, lights up red to indicate that display gain is uncalibrated.
INPUT
GAIN
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