Agilent / HP 5261A

This Video Amplifier is a plug in unit which increases the sensitivity of the Model 5345A Electronic Counter.

It provides for measurement of signals as low as 1 millivolt rms over the frequency range of 10Hz to 50MHz.

The input impedance is 1 megohm shunted by 15 picofarad and may be increased to 10 megohms through the use of a 10:1 divider probe.

An output signal is available from the front panel for monitoring the Video Amplifier output or for activating external instruments.

This signal is identical in frequency and amplitude to the amplified signal supplied to the counter input circuit.

The maximum input which can be safely applied to the instrument is 5 volts rms.