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| Marconi TK2374 200MHz zero loss probe for 2730. Can it be used with 2382? |
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| brian_mk:
The TK2374 200MHz zero loss probe was designed for the Marconi 110 MHz TF2370 analyser. My question is: Is it compatable with the later Marconi 400 MHz 2382 (at least up to 200MHz)? From what I've found so far, the Marconi 2388 1 GHz probe designed for the 2382 needs a +/- 15V power supply. The TK2374 appears to use a floating 15v supply from the 2370 which it converts to -7.5v internally. It's not clear to me if you can simply plug a TK2374 into the probe power socket of a 2382. |
| TimFox:
I have successfully used the TK2374 probe with the 2382/2380 spectrum analyzer. I was confused when trying to understand the power connections through the auxiliary cable, but it does work. I measured the THD (at 500 kHz) of the combination, using a Wavetek 98 generator driving 0 dBm into a 50 ohm termination (either the SA input or a terminator at the probe input): Direct With 2374 probe Fundamental 0 0 2nd harmonic -63 0.07 -37 1.4 3rd harmonic -61 0.09 -46 0.5 4th harmonic -70 0.03 <-72 THD 0.12 1.5 dBm % dBm % At 0 dBm/50 Ω = 0.22 V rms, the distortion of the probe is predominantly 2nd harmonic, with a total value of 1.5%. The DDS generator itself is quite clean, despite being at one-half its maximum frequency. The bandwidth of the probe (50 Hz to 200 MHz), should not matter at this frequency. |
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