[Test-Equipment] Helper Instruments SM-1000

[antqradio at juno.com]

Greetings
First time post from a long time lurker.
I have the above and just received a copy of the operators's
instructions.  Now I should be able to properly operate this neat piece
of test equipment.  The generator has output, the meters seem to work OK,
so I assume it is working properly.  The problem is I don't have the over
all specifications, they aren't in the instruction manual.  Helper
doesn't list it as current production, in fact, it seems they doesn't
support it any longer.

So, what are the SM-1000 capabilities?
What is the published frequency (XLO) stability?  Must be OK since it has
a crystal oven!
Is it OK to operate without the internal battery?  Mine was DOA so I
removed it.

Inquiring minds want to know!
Jim
Hot Springs, AR