Before powering it on for the first time, it's good to test all the parts and their connections, which is also a great opportunity to measure all the parameters :-)

• The input goes through the 2A circuit breaker. There should be no noticeable effect unless the current reaches 2A :-) So nothing to measure here.
• The output of the circuit breaker is connected to : 
  - a 300V MOV (a surge protection protection) : nothing to measure at low voltage
  - a neon pilot lamp : shouldn't be noticeable either
  - the primary coil of the isolation transformer : here we can measure the resistance and inductance:

Primary : 3 ohms, approx. 3.3 Henrys (disconnect the variac !)
Secondary : 4 ohms, approx. 3.8 Henrys (it seems to drift ???)

Between primary and secondary : > 2G ohms but 1.5nF...

...

The secondary is connected to quite a few things:

• Input of the voltmeter : should not be measurable
• Capacitor and MOV  : neither
• Switches: N/A :-D

Let's see the incandescent bulbs : I measure the "cold" resistance

• 5W : 734 Ohms
• 15W : 314 Ohms
• 28W halogen : 134 Ohms

The variac is a different story, because it's variable...