
Measurements (rf) 151
undisturbed by changes either in ^ or frequency The loop could be fast
enough to maintain control as the sig-gen was swept, making the whole
arrangement into a rudimentary but serviceable scalar network analyser.
An LCQ test set
The instrument described here enables the values of inductors and capac-
itors to be measured at or near the frequency at which it is intended to
operate them, up to around 150 MHz. In the case of inductors par-
ticularly, the results may be quite different from a measurement
made at audio frequency on an ordinary LCR bridge. It also permits
estimates of inductor Q,at the working frequency.
Measurin ...