HP 5345A Electronic Counter equipped with 5353A Channel C module with option 011.

Agilent HP 5345A. The 5345A Plug-in Frequency Counter with a range of 0.00005Hz to 500MHz. With plug-in converters the maximum frequency is 26.5GHz. This unit will perform frequency, period, multiple period average, time interval, time interval average, totalize, ratio and electronically controlled totalize measurements. Fully HP-IB programmable. Sensitivity is 20 mV RMS sine wave and 60 mV peak-to-peak pulse at x1. At x10 it is 250 mV RMS sine wave and 750 mV peak-to peak pulse. Resolution for frequency and period measurements is 2 nsec. Time base is 10MHz with stability of <5x10E-10 per day. Display is 11-digit LED plus sign and annunciator to display ksec to nsec, k to n, ?Hz to GHz. Sample rate continuously variable from <0.1 sec to >5 sec with hold position that maintains reading until reset.

011 - General Purpose Interface (Digital I/O plus control of all functions except input amplifier.)

Output

Programmable over the GPIB, the 5345A can transfer more than 9000 measurements per second over the bus. The fast
throughput saves time and reduces cost for systems applications.

Flexible Gating

For applications requiring more detailed information than the average frequency in a burst, the 5345A can accept your
choice of measurement gates. External gates as short as 20 ns can be used for profiling the frequency content of a chirp
radar, or characterizing the post-tuning drift of voltage-controlled oscillators.

Automatic Averaging

The automatic averaging algorithm improves accuracy. By lengthening the gate time, you can reduce the effect of jitter
and noise on your measurements.

High-Stability Timebase

The built-in timebase ages at the rate of 5 x 10 e-10 per day, extending the calibration cycle to two years while
maintaining kHz accuracy for a 20 GHz measurement.