Heathkit IM-4100 Digital Frequency Counter - Working
Heathkit IM-4100 Digital Frequency Counter - This is a portable Frequency Counter that will operate from 5Hz to 30MHz. This Frequency Counter has been Tested and CALIBRATED on an HP 8657A Signal Generator. Copy of manual is available online; please bring a USB stick. We did not use this much as we had three other counters including an HP5384A and so this did not see much use. No handle is included.
Condition: Good unit in working condition.
- Frequency 5 Hz - 30 MHz
- Sensitivity 15 mV RMS
- Time base frequency 10 MHz.
- Internal our external source oscillator- can be switched from the internal 10MHz oven oscillator to an external source via BNC connector in the back of the unit. This will allow for an external GPSDO or cesium clock to control the time base for greater accuracy.
- Unit has a connector on the back to operate on 12VDC - which is one of the reasons we thought it would be handy.
- Small Compact - 3"W x 7"W x 9"D