Operating Instructions

POSITION

11.HORIZONTAL

A variable control that positions the trace horizontally (X axis).

12.VERTICAL

A variable control that positions the display vertically (Y axis).

POWER

13.POWER

Switches the instrument between a powered up state and standby. Portions of the Power Supply circuit board have mains potential on them in either state. A mechanical indicator in the center of the switch shows the status of the POWER switch.

WARNING. Mains power is still applied to the 1705A Power Supply circuit board, regardless of POWER switch state. To totally remove shock hazard, it is necessary to unplug the instrument and wait for the capacitors to discharge.

Rear- Panel Connectors

Signal input and power input are located on the 1705A rear panel. See Fig- ure 2-2 for the locations of the rear-panel connectors.

INPUTS

1.L-BAND

A 75Ω input f-type connector used for the 900 - 2000 MHz input of L-Band rf, which is down converted by a Low-Noise Amplifier/Block Down Converter (LNB) from the received satellite signal.

2.LNB POWER (Switch)

Switch to turn on or off the +18 V supply on the L-BAND INPUT connec- tor. Supply is normally used to power a Low-Noise Amplifier/Block Down Converter at the antenna.

2- 4

1705A Spectrum Monitor

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Image 43
Tektronix 1705A instruction manual Rear- Panel Connectors, Position