供应 HM8122 频率计

频率计 HM8122
厂家：德国惠美
详细参数(PDF文件) 
Frequency Range: 0 - 1600MHz; 3 Inputs 
9 Measurement Functions; Ext. Gate and Arming 
Up to 8-digit Resolution at 1second Gate Time 
100MHz Time Base with 0.5ppm Stability 
IEEE-488 Bus or RS-232 Interface, optional 
The HM8122 is a feature-packed Universal Counter and, like all other instruments in the 8100 Series, it is prepared for operation in automated test systems as well as for laboratory bench- top measurements. The instrument has three sensitive inputs and provides ** measurement capability from DC to 1.6 GHz.

An impressive 10ns resolution during single pulse measurement is made possible by using a 100MHz reference oscillator. Resolution as fine as1ps is obtained through time interval averaging. The HM8122 displays low frequency measurements with an 8digit resolution at a 1s gate time.
Besides its nine basic functions, the HM8122 offers such practical features as a preselectable number of pulses per rotation, offset, display-hold, single-shot measurement, external ports for gating, arming, gate-view and trigger-view. The rear panel inputs allow for measurements of channel A gated by B. An integrated calibration routine and extensive power-up self-test ensure proper and accurate operation of the counter. Since any counter is only as good as its input circuitry, great care was taken in considering the technique of input ** conditioning.

The three ** inputs possess, depending upon frequency range, an input sensitivity of between 20mV and 60mV. A selectable low-pass filter, switchable input coupling, two 20dB attenuators per channel, and the switchable trigger slope enhance trouble-free operation with nearly all input **s. Automatic triggering can be turned off for complex ** measurements.

Any function of the Counter is programmable via the optional IEEE-488 or RS-232 Interface.