The GSC-001 is a special backpack for the GSP-830/827. For safety storage, also storage space is provided. Operational manuals, RF cable and terminals are all included.

Since any standards and normalized tests are not followed by product research or calibration diagnosis tests, the interference source is only found to give a better understanding for its frequency and energy; a diagnosis measurement equipment usually comes with a spectrum analyzer, a probe and preamplifier (not necessary). The GKT-006A provides a probe set with more added convenience upon diagnosis measurement.
A Near Field Probe is used to find out the signal required for analysis on the circuit board before seeking a possible interference on the circuit board. So that a probe is used to detect whether the signal here on the circuit board or components is interference source or internal signal; notably, since a probe is connected thru a spectrum analyzer to components or circuit boards, before being connected, it shall be recommended to confirm whether the power under test is within the range on a spectrum analyzer, possibly the circuit test after powering on.

Besides RF cable and terminals for connection, a 50 ohm terminal is provided to enable a user to perform a TG Normalize job for its reference level accuracy, primarily with RLB-001, ReturnLoss Bridge connection kits.

The Accessory kit set provides an operational accessory set for a 75 ohm system. The general RF system is categorized into a 50 ohm type. Once 75 ohm components are under test with a 50 ohm system, resistance incompatibility is possible and measurement error is there. For example, CATV/HDTV are both this type.

The Accessory kit set provides primary wires and terminals for RF signal measurement, particularly an attenuator against a longer RF signal. So that an instrument burns itself.

A frequency counter measures signal frequency. Basically it is designed to measure fixed frequency. If a frequency modulated signal is under measurement, the frequency variation will result in unstable measurement. Besides, frequency counters tend to measure the fundamental frequency without harmonic information. Since spectrum analyzers present spectrum distribution using marker functions, spectrum analyzers can tell the frequency in any point of the displayed signal. Spectrum analyzers provide complete information that frequency counters cannot.

A TG (Tracking Generator) acts as a sweep generator and its frequency is synchronized to the spectrum analyzer. So it is very useful for frequency response measurement. Before it is performed, normalizing the test setup is required just like a network analyzer. Refer to the operation manual for the detailed procedure. Besides, when the spectrum analyzer is set in "ZERO SPAN" which measures only one frequency, the TG will also output a fixed frequency signal without frequency sweep. In this case, TG is working as a signal generator that offers the same frequency range as the spectrum analyzer.

A wider RBW filters in more noise compared to a narrow RBW, therefore the noise floor level is proportional to the RBW bandwidth as in the 10*log (RBW) rule. Refer to Figure 1 as an example, where the noise floor at 30k RBW is 10dB higher than 3k RBW. From the above rule, 10*log (30k/3k) = 10dB.

FM signal has more complicated phenomenon than AM signal on the time domain which is presented in Figure1. The frequency is modulated to sweep with specified deviation, and it is very difficult to measure the deviation from the time domain. But on the frequency domain, the carrier frequency, modulating signal frequency, deviation and bandwidth can be figured out directly.

ACPR stands for Adjacent Channel Power Ratio and sometimes the ACLR as in Adjacent Channel Leakage Ratio. It's the measurement of adjacent channel power leakage related to main channel. Greater dB number means greater (better) rejection ratio between channels. The PU1, PU2, PL1 and PL2 are the power of upper and lower adjacent channels 1 and 2. Pch is the power of the main channel. OCBW OCBW stands for Occupied Bandwidth. It measures the bandwidth that takes the specified percentage in a channel. Figure 2 illustrates the example of a 99% OCBW. Smaller OCBW number at the specified % means more concentrated power distribution in the channel.

Make sure the device is powered on for at least 30 minutes, within +18℃ ～ +28℃ .This is necessary to stabilize the unit to match the specification.

Run the AUTOSET and let the GSP-830 find the best display scale for your target signal. Press the AUTOSET key, then press F1 (AUTOSET).