Pacific Antenna
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N2CX Accuprobe Plus


The N2CX Accuprobe Plus is a descendant of the common diode RF detector. It uses a special operational amplifier with a compensation diode to cancel out non-linear diode characteristics at low RF input levels. This allows accurate measurements down to about 50 mV rms as compared to several volts for ordinary detectors. This translates to a very low QRpp level of about 50 microwatts. The upper end of the range is 5 V rms or 1/2 watt. A second uncompensated range is provided to allow measurements up to 35V rms or 24-1/2 watts. Compensation is not needed for the higher voltage range since the detector is linear for high input levels.

The Accuprobe is used as an accessory to a reasonable quality digital multimeter. It provides a DC output voltage that gives a DMM reading calibrated to the RMS value of the Accuprobe RF input. On the LOW range the DC is read directly while the DMM reading is 1/10 the RF input of the HIGH range.

The Accuprobe is AC coupled so it can be connected directly to biased circuits with voltages up to 50V without upsetting circuit bias or inaccurate readings due to presence of DC. Its high input impedance and low capacitance allow it to be used with minimum loading on high impedance low-level circuits.

Specifications

Printed circuit board dimensions:1.8 x 1.9 inches
Power: 12 VDC at approx. 1 ma using a standard 12-volt battery
Input levels: LOW range - 50 mV rms to 5V rms (usable to 20 mV)
HIGH range - 5 V rms to 35 V rms
Frequency range: 100 kHz to 30 MHz (upper end not tested but should extend to VHF)
Outputs: DC - compensated to rms input
LOW range - 50 mV DC to 5 VDC (Uncalibrated readings to 20 mV)
HIGH range - 5 VDC to 35 VDC (1/10 RMS input)
Output accuracy: approx. 10% of reading decreasing to 25% at 50 mv
Supporting Files and Documents


 Accuprobe Assembly Manual (3/17/13 update)


Ordering Information

Ordering electronically by PayPal using the buttons below.

NOTE
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Accuprobe: $50.00
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Page last updated: 01/10/2017, 13:32:05
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