Thanks for the valuable information, Tom. It tells us that replacing the bnc with an sma would not necessarily be a welcome improvement.
Cheers
Tom
Sent from my iThing, so please forgive brevity and typos
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On Nov 20, 2021, at 16:16, Tom Gardner <tggzzz@...> wrote:
On 20/11/21 23:36, Reginald Beardsley via groups.io wrote:
The specs indicate a BW of 2.5 GHz. However, the BNC front panel connector is a significant limitation.
Has anyone substituted a 3.5 mm connector for the BNC and measured the BW?
The 1502's BNC is, or should be, "magic".
As Harvey White noted, the TD can be killed by static in a cable.
Tek's solution was to have a shorting bar in the BNC socket. Before the cable is fully inserted into the BNC socket, the bar will short the cable's centre conductor to the cable's shield, thus dissipating the static before the cable is connected to the TD. Presuming the bar is working correctly, with no cable connected the display should show a short pulse corresponding to the 72mm inside the 1502 between the sampling diode and the shorting bar.
It follows that you should not
* connect an inter-series adaptor to the 1502's BNC
* then connect the cable to the adaptor
since the adaptor will open the shorting bar rendering it useless when a cable is attached.
