Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
216 words
A voltage measuring device, comprising: a probe unit having input means, output means, and means including a plurality of field effect transistors and an operational amplifier electrically connected with said input means and presenting a high impedance, said input means including a contactor for contacting an element the voltage of which is to be measured, and said output means providing an output voltage indicative of a voltage measured during contact of said contactor of said input means with said element; conductor means connected with said output means of said probe unit; and electrical signal processing means receiving said output voltage from said probe unit through said conductor means and providing an output suitable for use at a utilization means to indicate signal voltage measured, said electrical processing means including a pair of transistors connected in series with one another with the output of said electrical signal processing means being taken from a junction receiving the outputs from said transistors, said output from said electrical signal processing means also being fed back through said conductor means and providing an output suitable for use at a utilization means to indicate said voltage measured, said output from said electrical signal processing means also being fed back through said conductor means to said high impedance means of said probe unit.
Claim 2
Dependent Claim
216 words
A voltage measuring device, comprising: a probe unit having input means, output means, and means including a plurality of field effect transistors and an operational amplifier electrically connected with said input means and presenting a high impedance, said input means including a contactor for contacting an element the voltage of which is to be measured, and said output means providing an output voltage indicative of a voltage measured during contact of said contactor of said input means with said element; conductor means connected with said output means of said probe unit; and electrical signal processing means receiving said output voltage from said probe unit through said conductor means and providing an output suitable for use at a utilization means to indicate signal voltage measured, said electrical processing means including a pair of transistors connected in series with one another with the output of said electrical signal processing means being taken from a junction receiving the outputs from said transistors, said output from said electrical signal processing means also being fed back through said conductor means and providing an output suitable for use at a utilization means to indicate said voltage measured, said output from said electrical signal processing means also being fed back through said conductor means to said high impedance means of said probe unit.
Claim 3
Dependent Claim
37 words
The measuring device of claim 1 wherein one of said field effect transistors is connected with said input means and another of said field effect transistors receives the signal fed back from said electrical signal processing means.
Claim 4
Dependent Claim
28 words
The measuring device of claim 2 wherein a third one of said field effect transistors is connected with said one field effect transistor to compensate for leakage current.
Claim 5
Dependent Claim
24 words
The measuring device of claim 1 wherein said device includes means for providing an output connectable with a scope to indicate said voltage measured.
Claim 6
Dependent Claim
67 words
The measuring device of claim 1 wherein said device includes range selection means, driving means, meter means, and polarity indicating means, said driving means being connected through said range selection means to receive the output from said electrical signal processing means and providing an output to said meter means and an indication of the polarity of said output to said meter means to said polarity indicating means.
Claim 7
Dependent Claim
34 words
The measuring device of claim 1 wherein said device includes power supply means having a transformer with the secondary winding thereof having a center tap which is connected to said electrical signal processing means.