Agilent DSO6014A is the fixed 1meg input impedance a concern?

[Chris Wilson]

I am looking at a used Agilent DSO6014A  100 MHz scope, and I note the 100 MHz bandwidth models only have input ports with 1 meg ohm input impedance. I am mainly into amateur radio and also attempt repairs on 1980's test gear. Will the fixed 1 meg input impedance be a PITA, or can I use 50 ohm feed through resistors when required? I currently use old school analogue scopes. Any other comments on these scopes welcome. I am in the UK, thanks.

[HighVoltage]

The DSO6000 series is internally the same as the DSO7000 series scopes.
I used an older 100 MHZ 7000 series scope in the past and just used a 50 ohm feed through resistors, when needed. No problem at all.
You can find them on ebay with reasonable prices.

My Agilent MSO7104B luckily can switch between 1M ohm and 50 Ohm.

[tggzzz]

Of course it isn't 1Mohm input impedance. It is 1Mohm//11pF, and it is worth working out the frequency at which the capactive impedance starts to dominate the resistance.

If you are using bog-standard *10 "high impedance" probes, make sure they can be compensated with a 11pF scope.

Apart from that, you can always use a 50ohm feedthrough terminator if you are looking at RF signals, or with a "low"-impedance *10 Z0 probe (N.B. the quotes - Z0 probes are actually higher impedance than so-called high-impedance probes!)

At 100MHz you could also use a 50ohm terminator on a BNC T-piece.