Agilent/HP / Frequency Counter / 5385A

Channel A Characteristics
  Range : 10 Hz to 100 MHz
  Sensitivity : [MAIN LEVEL] off
   15 mVrms sine wave 50 Hz to 100 MHz
   25 mVrms sine wave 10 Hz to 50 Hz
   45 mV pk - pk 5 ns mininum pulse width
  Dynamic Range : 45 mV to 4 V pk - pk x attenuator settiong.
  Coupling : AC
  Impedance : 
    X1 : 1 Mohm NOMINAL  < 25pF
    X20 : 500 kohm NOMINAL  < 25pF
  Attenuator : X1 or X20 NOMINAL, X20 increases to X40 below 50 Hz
  Low Pass Filter : 100KHz NOMANAL 3 dB point

Channel B Characteristics
  Fused input ! (Front panel accessible)
  Range : 90 to 1000 MHz
  Sensitivity : 
   10 mVrms (-27 dBm) 100 - 1000 MHz
   15 mVrms (-33 dBm) 90 ~ 100 MHz
  Dynamic Range : 10 mV to 7 Vrms (-27 to +30 dBm)
  Coupling : AC
  Impedance : 50 ohm NOMINAL
  Attenuator Level :
  Manual : variable from X1 to X18 (0 to 25 dB) NOMINAL
  Auto : AGC mode for improved noise suppression.
  Damage Level :
   AC > 1 MHz +30dBM (7 Vrms)
   AC < 1 MHz 2 Vrms 
   DC 5V
  
Frequency A and B
  Range Channel A : 10 Hz - 100 MHz
  Range Channel B : 50 MHz - 225 MHz
  LSD Displayed : 10 Hz to 1 nHz
  LSD (( 4 nsec) / (Gate Time)) x Freq
  Resolution : LSD ((1.4 x Trigger Error + 1 nsec rms) / (Gate Time)) x Freq
  Accuracy : Resolution Time Base Error x Period

OPTION