Hello,
I recently purchased an older Keithley 175 DMM in an attempt to use it with LabView via GPIB. I've tried for a few days to detect it on NI MAX but have been unsuccessful, I've tried sending commands on NI VISA but that hasn't had any success either. I've successfully managed GPIB comm with Keithley 2000/2001s, quite easily, but these units are at my job so I can't use them at home for personal use. I started to suspect that maybe the 175 is too old to use with newer NI GPIB software, so I connected one of the older teslameters. But sure enough that was found, so I don't think age or software is the issue. That isn't a great test but it's all I could think of. The multimeter does show "RMT" on the display which indicates the 1753 module is controlling the dmm so I at least think the module is detecting that a GPIB is connected.
I've gone through the 1753 GPIB module manual a bit to try and troubleshoot, and while it has good info about potential commands etc. a lot of the examples are for sending commands from an HP-85 which I don't think is applicable anymore. If anyone has any suggestions on things to try, they would be welcome.