Philips PM 6665 timer/counter 120MHz   

Frequency Range

• Input A: 0 MHz to 120 MHz (A/B); 0 MHz to 12 MHz (B/A, C/A, A/B Single)
• Input B: 0 MHz to 12 MHz
• Input C: 70 MHz to 1.3 GHz

Readout: 9-digit LCD  and cursor indi­cation

DC-Coupled: DC to 120 MHz, typ. to 160 MHz

AC-Coupled: 20 Hz to 120 MHz,typ.to 160 MHz

Minimum Pulse Duration: 4 ns

Coupling: AC- or dc-coupled , switch selectable  lmpedance: 1 MQ//35 pF

Channel Input: Separate A and B, or common via A  

Maximum Voltage Without Damage:350V (dc + ac peak) between O Hz and 440 Hz, falling to  8V rms at 1 MHz.     

Frequency Range

• DC-Coupled: DC to 120 MHz, typ. to 160 MHz 
• AC-Coupled: 20 Hz to 120 MHz,typ.to 160 MHz 
• Minimum Pulse Duration: 4 ns
• Coupling: AC or dc

Documentation

Manuals

Service Manual - Philips PM 6665 - Counter (opweb.de)    44 pagine

Datasheet

PHILIPS PM6665 Datasheet (testequipmenthq.com)

 Applications

Philips-Fluke PM6665 Frequency Counter with Oven Controlled Crystal Oscillator – JackenHack

Upgrade

PM6665/PM6669 OCXO upgrade - Page 1 (eevblog.com)