Agilent 5385A Frequency Counter
Data Sheet
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 minimum pulse width
Dynamic Range: 45 mV to 4 V pk-pk × attenuator setting.
Coupling: AC
Impedance:
X1: 1 Mohm NOMINAL | | <25 pF
X20: 500 kohm NOMINAL | | <25 pF
Attenuator: X1 or X20 NOMIONAL, X20 increases to X40 below 50 Hz
Low Pass Filter: 100 kHz NOMINAL 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 +30 dBm (7 Vrms)
AC <1 MHz 2 Vrms
DC ± 5V
Timebase (TCXO)
Frequency: 10 MHz
Aging Rate: <1 × 10e-7/mo.
Temperature:
<2 × 10e-6, 0-40° C
(± 1 × 10e-6, 0-40° C if referenced to 25° C, and set to the offset frequency.)
Line Voltage: <5 × 10e-8 for ±10% variation.
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)) × FREQ
Resolution: ±1 LSD ± ((1.4 × Trigger Error + 1 nsec rms) / (Gate Time)) × Freq
Accuracy: ± Resolution ± Time Base Error × Period
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