R
R. D. Davis
- Jan 1, 1970
- 0
Greetings. Does anyone on this newsgroup happen to have manuals handy
for either of these meters, or happen to be familiar enough with them
to answer a few questions?
While checking out a Heathkit IM-1528 VTVM and an IM-1538 AC
voltmeter, neither of which I have the Heathkit manuals for, I
observed a few things that don't appear to be quite right with these
meters. I'd like like to get them working again and begin using them
on my bench.
When looking inside of the IM-1528, at first I thought that my eyes
were playing tricks on me. There's a size C battery sitting in what
looks like a capacitor clamp, with wires soldered to either end of the
bettery. This doesn't seem quite right, so I didn't attempt to plug
it in and try it, not even with a variac. Is there supposed to be a
battery soldered into that circuit?
As to the IM-1538, other than one disconnected wire inside the chasis,
which is connected only to the "dB out" jack, IIRC, everything looked
ok. When I plugged it in, things appeared ok when the "volts" switch
was depressed, other than the meter not being zeroed on most of the
scales. When the "dB" switch was depressed, the meter
"reverse-pegged," no matter which scale was selected. What I mean is
that it went off of to the left-most end of the scale, as far as
physically possible, where there were no markings. Is this indicative
of something more than a need for more than a few adjustments?
for either of these meters, or happen to be familiar enough with them
to answer a few questions?
While checking out a Heathkit IM-1528 VTVM and an IM-1538 AC
voltmeter, neither of which I have the Heathkit manuals for, I
observed a few things that don't appear to be quite right with these
meters. I'd like like to get them working again and begin using them
on my bench.
When looking inside of the IM-1528, at first I thought that my eyes
were playing tricks on me. There's a size C battery sitting in what
looks like a capacitor clamp, with wires soldered to either end of the
bettery. This doesn't seem quite right, so I didn't attempt to plug
it in and try it, not even with a variac. Is there supposed to be a
battery soldered into that circuit?
As to the IM-1538, other than one disconnected wire inside the chasis,
which is connected only to the "dB out" jack, IIRC, everything looked
ok. When I plugged it in, things appeared ok when the "volts" switch
was depressed, other than the meter not being zeroed on most of the
scales. When the "dB" switch was depressed, the meter
"reverse-pegged," no matter which scale was selected. What I mean is
that it went off of to the left-most end of the scale, as far as
physically possible, where there were no markings. Is this indicative
of something more than a need for more than a few adjustments?
