Hi,
Oh, it´s a wide range....
![Cool 8)](https://www.eevblog.com/forum/Smileys/default/xcool.gif.pagespeed.ic.cOxV6sPNRd.png)
Some are using a frequency signal only for inductance and for C and R dc, some use for every three ac signal, some got a amplitude of only 2Vpp, some 12Vpp....
Most of the cheaper LCR-DMMs using a frequency not higher than 1Khz, the better ones 100Hz/1Khz/10Khz depending on the ranges...
There are no specifiactions in general, you have to look at the datasheet if avaible or measure it before using it.
For example, I did measure the output of a cheap LCR-DMM (Vici DM4070), it uses ac-signal only for inductance and it use 2 frequencies, see pics.
Because of it´s low output-voltage, maybe the ATLAS LCR40 could be a suitable one.