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Table 6-1.Description of Front Panel Controls, Indicators, and ConnectorsContinued - 14188_221
ANSWERS TO QUESTIONS Q1. THROUGH Q18. - 14188_223

Neets Module 16-Introduction to Test Equipment
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6-44 Table 6-1.—Description of Front Panel Controls, Indicators, and Connectors—Continued ITEM FUNCTION DESCRIPTION 27 MIN NOISE/MIN DISTORTION This selects one of two logarithms used to control attenuator and IF gain. MIN NOISE (button illuminated) reduces the noise level by reducing attenuation and IF gain 10 dB. MIN DISTORTION (button not illuminated) reduces distortion to its minimum. To observe any changes, the RF attenuation displayed on the CRT readout must be 10 dB higher than that set by the MIN RF ATTEN selector. 28 POWER This is a pull switch that turns power on when extended. 29 RF INPUT This is a 50 ohm coaxial input jack used to input signals of 21GHz or below. The maximum nondestructive input signal level that can be applied to this input is +13 dBm or 30 mW. Signals above 10 dB may cause signal compression. 30 POSITION These controls are used to position the display on the horizontal and vertical axes. 31 CAL OUT This is an output jack that has a calibrated 20 dBm 100 MHz signal, with frequency markers spaced 100 MHz apart. The calibrated 100 MHz marker is used as a reference for calibrating the reference level and log scale. The combination of 100 MHz markers is used to check span and frequency readout accuracy. 32 OUTPUT 1ST AND 2ND LO These jacks provide access to the output of the respective LOs. The jacks must have 50 ohm terminators installed when not connected to an external device. 33 EXTERNAL MIXER When the EXTERNAL MIXER button is activated, bias is provided out the EXTERNAL MIXER port for external waveguide mixers. The IF output from the EXTERNAL MIXER is then applied through the EXTERNAL MIXER port to the second converter for use. 34 PEAKING This control varies the mixer bias for external mixers in the EXTERNAL MIXER mode.  This control should be adjusted for maximum signal amplitude. NORMAL INDICATIONS UPON POWER ON With power applied (power knob pulled out), the spectrum analyzer will automatically (upon microcomputer control) go into the following conditions. If you do not find these indications, there is a probably a problem with the unit.   Vertical display: 10 dB/div;   Frequency: 0.00 MHz;   REF level: +30 dB;   RF attenuation: 60 dB;   Frequency range: 0.0 to 1.8 GHz;   Auto resolution: 1 MHz;   Resolution bandwidth: 1 MHz;   Freq Span/Div: Max;   Triggering: Free run;   Readout: On;   Digital storage: View A/View B On;






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