I'm looking for an off-the-shelf function generator with more than the usual10Vpp output signal. The requirements are 30..500Hz square wave, with 20Vpp and output impedance 50Ohms or less (but load current is less then 5mA). Since output voltage is usually well hidden in dozen pages of specification, I'd be glad if someone could point out a device with high output voltage capability.
I know it would be easy to build something (I'm using a home-grown booster amp myself for testing), but it's for a calibration check list for my customer's customer; so modified-audio-kit or ebay is out of question.
Thanks for any info