Let's move onto Python now.

Assuming you have a local python venv for pip. Install the pyvisa packages and fire up an ipython shell:

pip3 install pyvisa pyvisa-py zeroconf psutil
ipython3

Import the module, use pyvisa-py as the resource manager and query for all resources on all GPIB interfaces.

import pyvisa as py
rm = pv.ResourceManager('@py') 
rm.list_resources()

This should show the instrument on the GPIB device 0, PAD 1:

('GPIB0::1::INSTR',)

Instantiate an instrument object:

inst = rm.open_resource('GPIB0::1::INSTR')

The commands are listed in this PDF starting at page 147 in the pdf / 133 in the document.

Got a box full of nice stuff in the mail :3
Thanks, Rik <3

The LM299AH is a real classic. A precision, temperature-stabilized monolithic zener. The temperature stability is 1 ppm/°C, with 20 ppm long term stability, and a noise floor of 7 µVpp typical, 20 µVpp max between 10 Hz - 10 kHz.
The problem is that the initial reverse break down voltage is not well known. It's somewhere between 6.8 - 7.1 V. Which means, in order to build a reference using it, you need a reference to calibrate it to.

The REF02 is a bandgap based 5V precision reference. 10ppm/°C temperature drift, 10µVpp max noise (0.1 Hz - 10 Hz) and a known output voltage of +5 +- 0.2% max. It also has a trim input to further calibrate it within a +- 6% range. The long term stability is specified at +- 100 ppm for the first 1000h, +- 50 ppm for the second 1000h.

The VRE3041A has a known output voltage of 4.094 V +- 0.409 mV, that's 0.01%. A temperature drift of 0.6 ppm/°C, noise of 3 µVpp (0.1 Hz - 10 Hz), and a long term drift of 6 ppm/1kh. It also has a trim option for < 0.01% initial error.

The LTC 6655 is a bandgap based voltage reference.
I have the 5V variant in the hermetically sealed 5x5mm LS8 package. It goes for 16 € a pop on mouser, not including taxes.
Noise is 0.25 ppm pp between 0.1 Hz and 10 Hz, with a 2 ppm/°C temperature drift, a high initial accurary of +- 0.025 % max, and a long term drift of 20 ppm/sqrt(kHr). Dope af.