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AADE

L/C Meter IIB 

Digital Inductance and Capacitance Meter

 

Our friend and colleague Neil Hecht passed away on August 19th, 2015.  This page will remain in place indefinitely, but the products listed here have been discontinued and are not available. 
 
--N1FN 08/29/15

LC Meter

L/C Meter IIB

From Amost All Digital Electronics, the L/C Meter IIB is a hand-held, digital inductance and capacitance meter with a sixteen character LCD with four digit resolution in each mode. Thus the maximum resolution for inductance is one nanohenry (1 nH) and for capacitance one  tenth of a picoFarad ( 0.1 pF).  Maximum measurable values are  150 millihenry (mH) and  1.5 microfarad (uF). The unit features AUTOMATIC RANGING and SELF-CALIBRATION. Each L/C Meter IIB is hand-assembled in the US.


SPECIFICATIONS

Range:

  • .001 uHy (1 nHy) to 100 mHy (most units measure to 150 mHy)
  • .010 pf to 1 uF (most units measure to 1.5 uF)
  • AUTOMATIC RANGING
Accuracy:
  • 1% of reading typical
    • Typical means the average error of 83 different components compared to an
      • HP4275A digital L/C meter (test frequency 1MHz) for components ranging from .1uHy to 1mHy and 2.7pf to .068uF,
      • B&K 878 digital LCR meter (test frequency 1KHz) for components ranging from 1mHy to 100mHy and .1uF to 1.6uF.
  • (L/C Meter II is characterized for hobby or non-critical commercial use)
  • SELF CALIBRATING

Display:
  • 16 character LCD display module
  • Four digit resolution
  • Direct display in engineering units (ie: Lx= 1.234 uHy / Cx= 123.4 pF)

Operating modes:

When the Lx and Cx switches are off the ZERO switch acts as a MODE SELECT.

  • The following modes are sequentially selected
    • READY MEASUREn MODE - measure Lx or Cx and display in nano units when applicable
    • READY MEASUREu MODE - measure Lx or Cx and display in micro units (ie: .01000 uF instead of 10.00 nF)
    • READY MATCHn MODE -
      • first measures your reference component Lz or Cz and displays its value in nano mode
      • measures subsequent components, Lx or Cx, and displays the difference (Lz-Lx) or (Cz-Cx) in nano mode
    • READY MATCHu MODE -
      • first measures your reference component Lz or Cz and displays its value in micro mode
      • measures subsequent components, Lx or Cx, and displays the difference (Lz-Lx) or (Cz-Cx) in micro mode
    • READY MATCH% MODE
      • first measures your reference component Lz or Cz and displays its value in nano units
      • measures subsequent components, Lx or Cx, and displays the percentage difference
        • (Lx-Lz)/Lz*100 or
        • (Cx-Cz)/Cz*100 as percent.
          • range is -100% to +9999%
          • maximum resolution is 00.01%
  • L/C Meter IIB zeros out stray inductance and capacitance by storing their values in RAM and subtracting them from the measured values. It can zero out any value in its range allowing longer test leads and slightly improved accuracy over L/C Meter II.

L/C Meter IIB works by measuring the shift in frequency caused by inserting an unknown into it's oscillator tank circuit. A PIC16C61 micro-controller measures the frequency before and after. It then computes the value of the unknown using a floating point math package and displays the result on a 16 character intelligent LCD display.

L/C Meter IIB will NOT measure inductors designed for 60 or 120 Hz applications such as power transformers, filter chokes or motors. The minimum test frequency is about 20KHz and these devices have enormous core losses at that frequency. The LC Meter IIB is powered by a 9V battery, not included..






Our friend and colleague Neil Hecht passed away on August 19th, 2015.  This page will remain in place indefinitely, but the products listed here have been discontinued and are not available. 
 
--N1FN 08/29/15

  

The LCM2 and 2B were formerly available as a kit-- here are some comments from builders and users.

Here's a review that Patrick Kvitkauskas posted on QRP-L in 1997:

And this comment from Yasuo Itoh, JN2AMR-- And from Mike Melland, W9WIS--
"I purchased the L/C Meter IIB through you  and got it assembled shortly after it arrived last week.  I had read over the past several years lots of rave reviews but had to see for myself.  The result .... What a great device!  It went together easily and works better than described.  I brought it to work and took it over to the lab at the college where I work and everyone there is amazed at it's accuracy (especially considering the price).  It compares VERY favorably with our sophisticated laboratory instruments and easily meets AADE's 1% reading comparisons and will be a permanent part of my home shack/bench from now on."
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