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;
