In this episode Shahriar takes a close look at the new Signal Hound PNCS-1 clock standard module. The purpose of this instrument is to provide an exceptionally clean phase noise reference at 1GHz in order to characterize other instruments such as spectrum analyzers and oscilloscopes.
The unit uses an OCXO at its heart running at 100MHz. The signal is them multiplied by a factor two and then a factor of five while being filtered and amplified in order to generate 1GHz. The complete signal path of the instrument is analyzed. The unit is then used on an Agilent MXA generator to characterize its phase noise. A frequency divider is also used in conjunction with the PNCS-1 in order to create lower frequency signals.
In this episode Shahriar presents an overview of a small portion of the vendors present on the exhibition floor at the International Microwave Symposium 2018.
The IEEE MTT International Microwave Symposium (IMS) is the premier annual international meeting for technologists involved in all aspects of microwave theory and practice. It consists of a full week of events, including technical paper presentations, workshops, and tutorials, as well as numerous social events and networking opportunities. The symposium also hosts a large commercial exhibition. Co-located with IMS are the IEEE RFIC, IMBioC and ARFTG conferences.
In this episode Shahriar takes a close look at a defective Agilent E4440A spectrum analyzer. Initial analysis reveals that the startup errors are caused by a defective pre-amplifier module. During initial alignment and calibration, the defective microwave relays inside the pre-amplifier module fail insertion loss specifications and cause alignment failures.
Unfortunately, the relays are not repairable and must be replaced. Two new relays are purchased and replacement clears all alignment issues. The main motherboard battery has also failed; a replacement battery corrects any time and date keeping errors. The repaired instrument is cycled through several alignment procedures without any problems. The performance of the unit is verified by examining the DANL of the instrument with and without the pre-amplifier activated.
Massive inventory of test and measurement equipment with over 20,000 units to chose from.
Full service general laboratory where repairs, refurbishment, and testing are carried out.
An additional NIST traceable metrology laboratory with extensive T&M capabilities where OEM grade calibrations are performed.
5% discount on any purchase when The Signal Path Blog is mentioned for first time customers with limit one per customer.
The 3458A unit fails startup conditions with several errors. After close inspection of the boards, the initial problem points to a poorly plugged in fiber-optic cable. After this fix, the unit still fails ACAL on the AC Board. The unit’s NVRAM modules all have to be replaced. During this process the memory of the unit is also upgraded and the firmware is updated to the latest available version. After analysis of the schematics the problem is traced to a damaged JFET input operational amplifier on the attenuator flatness calibrator unit. The replacement allows the unit to pass all self-test and ACAL calibration. The instrument is then NIST calibrated by AllTest Instruments and shows excellent performance when compared with various multimeters in the lab.
The Signal Path (TSP) is an electrical engineering video blog for industry professionals, students and hobbyists. TSP is a non-for-profit website dedicated to provide free education spanning a wide range of electrical engineering topics. Equipment reviews, tutorials and repair videos are posted regularly.