With the 33622A Arbitrary Waveform generator I was sent for review from Element 14, I have discovered it is possible to use it for some basic component measurements with surprising accuracy
this is a link back to the primary review http://www.element14.com/community/roadTestReviews/1744
In this blog I will show you how to use basic techniques to derive the value of unknown capacitors and Inductors
All you need is a fast pulse (Compliments of the 33622A), an oscilloscope and a known value Resistor set (1K, 10K, 100K and greater), really any values will do, you just need to know the real value.
The test schematics:
So without further ado, lets measure some caps
33622A Setup and sample scope display
Initial Setup for capacitor measurement and sample displays for "Scope Probe" and then C3 with a 10K resistor
The capacitor tests being performed using the 33622A as a high accuracy and quality square wave generator
Setup for Inductor measurement, Un-Expanded ringing view, Partly expanded then expanded view in order to measure ringing frequency
The Inductor Tests being performed using the 33622A as a quality square wave generator
Now that all the measuring is completed, here is the Math
EXCEL Spreadsheet Math
| R in Ohms | time in Seconds | C Calc in Farads | C DMM Measured | Marked on device | |
| C0 | 100800 | 1.56E-06 | 1.54762E-11 | 8.43E-10 | |
| C1 | 100800 | 1.17E-03 | 1.16071E-08 | 1.10E-08 | 10nF |
| C1 | 9960 | 1.17E-04 | 1.1747E-08 | 1.10E-08 | 10nF |
| C2 | 9960 | 9.80E-04 | 9.83936E-08 | 9.73E-08 | 100nF |
| C3 | 1001 | 5.50E-03 | 5.49451E-06 | 5.54E-06 | 4.7uF |
| C4 | 1001 | 1.11E+00 | 0.001108891 | 1.01E-03 | 1000uF |
| f | w: (2*PI*F)^2 | H: (W * C) | uH | ||
| L1 | 132900 | 6.97284E+11 | 1.46E-05 | 14.58 | |
| L2 | 22620 | 20199700856 | 5.03E-04 | 503.14 | |
| L3 | 29070 | 33361825025 | 3.05E-04 | 304.64 | |
| L4 | 20000 | 15791367042 | 6.44E-04 | 643.60 |
