Products > Test Equipment
AN8008 US $19, 9999count, 1uV, 0.01uA, 0.01Ohm, 1pF resolution meter
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texaspyro:
I got in a Ragu 17B+ and it has a problem.  The volts range reads 10% low... 5V in says 4.546 B out.  Seems to read OK when manual ranging on the other ranges.   Looks like somebody at the factory screwed up the calibration.
MacMeter:

--- Quote from: texaspyro on September 16, 2017, 05:09:07 pm ---I got in a Ragu 17B+ and it has a problem.  The volts range reads 10% low... 5V in says 4.546 B out.  Seems to read OK when manual ranging on the other ranges.   Looks like somebody at the factory screwed up the calibration.

--- End quote ---

I bought the Ragu to leave on a work truck to monitor an 1800 amp diesel generator. Same issue I reported earlier, voltage readings seem fine. Hertz readings seem accurate, but I've had problems in both hertz dial positions. So far I can't reliably reproduce the problems. In the first dial position for hertz and voltage, I get no readings for hertz at times, but can get a reading in the dedicated hertz dial position, then at times this behavior is just the opposite. The "select" button does not work as expected in these modes as well. I guess for $10, it's workable, but obviously the firmware/software as well as button modes was not well tested.
Fungus:

--- Quote from: MacMeter on September 16, 2017, 06:45:23 pm --- I've had problems in both hertz dial positions. So far I can't reliably reproduce the problems. In the first dial position for hertz and voltage, I get no readings for hertz at times, but can get a reading in the dedicated hertz dial position, then at times this behavior is just the opposite.

--- End quote ---

The AC mode "Hertz" function is probably only for low frequencies (mains AC).

The dedicated Hz function will probably go much higher.

If you don't get a reading, try swapping the leads around. These meters often need a zero crossing to work. eg. My AN860B+ only measures the frequency of Arduino pins when the leads are connected "backwards".

MacMeter:

--- Quote from: Fungus on September 16, 2017, 07:02:20 pm ---
--- Quote from: MacMeter on September 16, 2017, 06:45:23 pm --- I've had problems in both hertz dial positions. So far I can't reliably reproduce the problems. In the first dial position for hertz and voltage, I get no readings for hertz at times, but can get a reading in the dedicated hertz dial position, then at times this behavior is just the opposite.

--- End quote ---

The AC mode "Hertz" function is probably only for low frequencies (mains AC).

The dedicated Hz function will probably go much higher.

If you don't get a reading, try swapping the leads around. These meters often need a zero crossing to work. eg. My AN860B+ only measures the frequency of Arduino pins when the leads are connected "backwards".

--- End quote ---

All my tests have been on 60 Hz sources, the Geny is a 3-phase crystal sync. However, come Monday I'll try your suggestion of reversing the leads. Thanks.
stj:
it's in the "manual", each Hz setting has different voltage and frequency limits.

the one on the voltage position has a very limited frequency range 40Hz-1KHz - probably intended for testing power sources,
the dedicated range is only supposed to work upto about 35v if i remember right.
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