供应二手LF827 频率计 频率测试仪

Leader LF 827 1.3 GHz Frequency Counter Extended Low Frequency Range to 0.1 Hz 
High Speed Reciprocal Counting at Low Frequencies 
Frequency Period, Totalize, Relative and RPM 
3ppm Time Base Accuracy Standard 
Relative Mode From a Preset Reference 
LO-GO-HI Judgement with Preset Limits 
High Senstivity 
Auto-Trigigering Minimizes Errors on Noisy Signals 
EMI Protection

Incorporating the latest developments in counter technology the LF 827 extend high resolution readings over very wide frequency ranges and make use of calculator modes to meet the needs of assembly line and quality control applications. A technique of high speed reciprocal counting is applied to input A **s to produce high resolution at low frequencies. (Older counters required period readings with calculated reciprocals to obtain similar resolution). Direct counting is applied above 10 MHz and a prescaler technique is applied to B input **s above 80 MHz. The result is accurate, high-resolution reading across the entire frequency range.

Measuring modes include frequency, period, relative, totalizer and RPM for input A **s. Automatic and manual trigger levels are also applied to input A **s to suit trigger conditions to ** characteristics and to achieve stable readings in the presence of noise. A switchable low pass filter, cutoff below 100 kHz, allows accurate low frequency readings in the presence of RF interference. Sensitivity is excellent: 15 mV rms for input A and 10 mV rms for the B (prescaler) input.
Built-in calculation capabilities include relative and a LO-GO-HI comparator judgement modes. The relative mode works from an operator-preset parameter and reads out the deviation from that preset value with 7-digit resolution. The comparator function works with a pair of preset parameters and indicates low, within limits, or high readings by means of front panel LO, GO or HI LED's. Timebase accuracy is ± 3 ppm. Factory options for the LF 827 include a ± 0.03 ppm timebase and a GPIB interface.