Regardless of the A filter selection, it showed a frequency of 3. Another user working on a homebuilt oscillator also reports extreme sensitivity to harmonics. This harmonic sensitivity, combined with extreme sensitivity makes the instrument virtually useless when us- ing any frequency multiples in your project: you won't know which signal is being locked onto.
Using the B input was even worse. The procedure used was to start at about mV and go down first. If a stable count held, I reduced the PP voltage until spuratic readings were obtained. If mV was giving spuratic or known-to-be-wrong numbers, I turned the amplitude up until a stable reading was obtained.
In all cases, the scope showed clean signals with no high frequency hash. Stable operation of the Hi-Z input is mandatory to use the interval and period functions of the A, and this condition does NOT seem to be met.
I consider the non-frequency modes to be historical car- ry-overs from the product lines' counter heritage rather than useful features of OE's OE10 custom chip.
I own a PK radio modem and decided to see if the meter was good enough to tune the audio tones. With full output from the PK about 0.
No, I did not adjust the PK With a 12" dangling wire near the coax out the back of the radio, the counter was dominated with a signal at approximately MHz Later tests 25 miles across town again showed that with a wire pigtail antenna, it was being dominated with this station. I went back to the Hi-Z inputs.
At this point I was trying to determine the electrical length of some coax. The high current node at the terminator is the point I was trying to pickup RF with the A.
Twenty turns of perfboard wire around a pencil stepped up the voltage enough for the meter to register stable counts when the pickup coil was positioned near the end of the coax shorting wire loop. Characterization of the three ohm amps with an HP generator showed solid frequency locks at these random check points: Fast Amp Middle Amp Slow Amp MHz, dBm, 1.
What a coincidence. Works for me! In any case, I usually don't need to know the last 2 Hz on a Hz signal. It turns off after 10 seconds of inactivity and comes on again when some button is pressed or frequency is acquired. It looks good. The native display is plenty readable and the extra light actually makes reading it harder from angles "above" the counter.
It only works in FREQ mode. It provides only the most re- cent number, with no indication of whether this is another sample or the same number it just sent you after your last request.
The interface can sink 1. Excellent amplifier sensitivity isn't everything. Sometimes it's even a burden. Specified sensitivity ranges from dBm to dBm. Ambient noise, including FM stations hovers about dBm. Play with those numbers and you'll see that the window for a good count can be pretty small. Try to measure a cordless phone near your transmitter or computer monitor?
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