Detailed Specifications

Characteristic	Rating
Output	-13dBm typical 1kHz and 100kHz -17dBm typical 10MHz 10kHz square wave 13dBm, typical Duty cycle 50% DC coupled 0 to +2.5V pulse into 50Ohms
Rise/Fall Time	Typical rise/fall time 470ps/270ps
Comb connections	SMA
Output Impedance	50 Ohm
Operating Temperature	0 to 45° C (32° F to 104° F) at 80% relative humidity
Absolute Maximum Voltage	< 50VAC and 75VDC

Changing the Comb Mode (see User Manual for detailed instructions)

Mode	Description	Red	Yellow	Green	Notes
1*	Steps (through modes 2-4)	X	X	X	300ms per mode
2	1kHz Impulse	X			Frequency and Width Dither, ~2% duty cycle
3	100kHz Impulse		X		Frequency and Width Dither
4	10MHz Impulse			X	Frequency and Width Dither
5	10kHz Square Wave	X	X

Model	Description	Price
J2150B	USB Harmonic Comb	$495.00 Add to Cart

Description

The Harmonic Comb Injector is an ultra-portable multifunction signal generator. A comb signal generator is simply a device that produces a set of harmonically related CW signals whose spacing is based on a fundamental oscillator frequency. It has many uses including EMI, power supply and clock jitter testing, cable testing, EMC chamber testing (for measurement consistency day-to-day, and comparing one chamber to another), a general purpose source for characterizing semi-anechoic chambers and step load testing.

Comb Features and Benefits

• Wideband harmonic comb generator spans 1kHz-1GHz+
• Multiple modes include time and frequency jitter
• Easily change modes via pushbutton
• Quickly identify power supply related issues
• USB powered; replaces bulky AWGs
• Impulse and Square Wave Outputs
• Ultraportable USB stick design, Powers from any USB port
• Can be used with the P2105A (S10) load stepper head option

The stepped and manually-controllable frequencies of 1 kHz, 100 kHz, and 10 MHz help separate this comb generator from other generators. It is the perfect troubleshooting tool to help reveal resonances in power bus and power supply circuitry, thus maximizing stability and minimizing EMI from these sources. It’s also very useful as an EMC/EMI troubleshooting tool.

The 1kHz mode is low duty cycle (~2%), and can be used to control the P2105A (S10) load stepper probe. Other modes could damage the load stepper probe which can only be run at low duty cycles due to the heat that is generated. So caution is warranted. When using the comb set and confirm that the 1kHz mode is active before connecting the load stepper probe to a power rail.