The EM-6990A Broadband Preamplifier is used primarily with the EM-6992 Probe Set in performing EMI diagnostic testing. The EM-6990A provides a significant improvement in overall measurement sensitivity of the typical spectrum analyzer. Small size and internal rechargeable batteries make the unit suitable for both bench and field testing. An external battery charger is used to recharge the internal batteries.


The EM-6990A is a quality preamplifier with high performance, suitable for a number of applications. It improves the sensitivity of EMI analyzers, spectrum analyzers, oscilloscopes and many other devices without distortion of amplitude accuracy.



Frequency Range: 5 kHz – 2 GHz
Gain: 18-20 db, Typical
Impedance: 50 ohms Nominal
Noise Figure: 6 dB nominal
1 dB Compression Point: -1 dBm
Power Source: 6 rechargeable “N” cells
(1.2 VDC NiMH)
Operating Time: 15 hours
Recharge Time: 8-10 hours


Length: 76 mm (3″)
Width: 89 mm (3.5″)
Height: 44.5 mm (1.75″)
Weight: 10 oz.

Charger Power Requirements

115/220 VAC, 50/60 Hz

Product Sheet