Jay_Diddy_B, here's something you may want to try on your 4274.

I've noticed that even the best professional LCR meters begin to have trouble making an accurate measurement of the smaller part of an impedance when the ratio of the larger part to the smaller part begins to exceed 1000. An example of this is when measuring the ESR of a very good quality polypropylene capacitor.

It would be good to have a way to test a meter, but with capacitors there's no way to be sure just how low the ESR is at low frequencies (which is where that ratio gets large (this is the Q in the case of a capacitor).

An alternative is to measure the inductance of a wirewound resistor. A high value wirewound resistor measured at a low frequency provides a test. Here's a picture of a suitable resistor I used. It is a 10k ohm resistor, wound with very small diameter resistance wire. This wire is so small that skin effect will not be noticeable up to several MHz:

Here's the result of a sweep of this resistor on the impedance analyzer. The real part of the impedance is shown in yellow, dead flat at 10000 ohms. The imaginary part (X) is shown in green and shows the expected behavior as we go down in frequency until we reach about 10 kHz, the frequency where Rs is 1000 times larger than X. Below 10 kHz, the reactance curve is no longer the straight line we would expect--the meter is having trouble making the measurement.

This resistor has no ferromagnetic core and we can be sure that the inductance does not rise by several orders of magnitude at low frequencies, so if we plot the inductance vs. frequency over a range from 100 Hz to 1 MHz, the result should be a flat line.You can see that the "measured" inductance rises drastically at low frequencies. Notice that the inductance begins its drastic rise about the time that the ratio Rs/X reaches 1000. At larger ratios, the meter can't make an accurate measurement.