The Keysight (formerly Agilent/HP) 53131A is a high-performance, 225 MHz two-channel universal counter capable of 10 digits per second frequency resolution and 500 ps time interval resolution. Built for both benchtop and ATE systems, it provides a comprehensive suite of measurement functions including phase, duty cycle, and peak voltage, with an optional third channel extending frequency coverage up to 12.4 GHz.
Specifications
General
| Parameter | Value |
|---|---|
| Interfaces | GPIB standard |
| Display | Vacuum fluorescent |
Physical
| Parameter | Value |
|---|---|
| Power Supply | 100-120 V (50, 60, or 400 Hz) / 220-240 V (50 or 60 Hz); 170 VA max |
| Operating Temperature | 0 to 55 |
| Dimensions (W×H×D) | 212.6 × 88.5 × 348.3 mm |
Measurement Functions
| Parameter | Value |
|---|---|
| Limit Tests | Automated limit tests supported |
| Math Functions | Scale and Offset |
Input Characteristics (Channels 1 & 2)
| Parameter | Value |
|---|---|
| Number of Channels | 2 standard (Channels 1 & 2), 1 optional (Channel 3) |
| Frequency Range (DC Coupled) | DC to 225 MHz |
| Input Impedance | 1 MΩ or 50 Ω (selectable) |
| Coupling | AC or DC |
| Sensitivity (DC to 100 MHz) | 20 mVrms |
| Sensitivity (100 MHz to 200 MHz) | 30 mVrms |
| Sensitivity (200 MHz to 225 MHz) | 40 mVrms |
| Damage Level (50 Ω) | 5 Vrms |
| Input Capacitance (1 MΩ) | 30 pF nominal |
High Frequency Input (Optional Channel 3)
| Parameter | Value |
|---|---|
| Frequency Range | Up to 12.4 GHz (frequency-option dependent) |
Measurement Specifications
| Parameter | Value |
|---|---|
| Frequency/Period Resolution | 10 digits/sec |
| Time Interval Resolution | 500 ps |
Frequency Range
| Parameter | Value |
|---|---|
| Channel 3 Frequency (Option 030) | 100 MHz to 3.0 GHz |
| Channel 3 Frequency (Option 050) | 200 MHz to 5.0 GHz |
| Channel 3 Frequency (Option 124) | 200 MHz to 12.4 GHz |
Measurement Characteristics
| Parameter | Value |
|---|---|
| Gate Time | 1 ms to 1000 s |
Input Characteristics
| Parameter | Value |
|---|---|
| Trigger Level Range | ±5.125 V (±50 V with x10 attenuator) |
| Input Attenuation | x1 or x10 |
| Low Pass Filter | 100 kHz (switchable) |
Environmental
| Parameter | Value |
|---|---|
| Storage Temperature | -40 °C to +71 °C |
Time Base
| Parameter | Value |
|---|---|
| External Reference Input Frequency | 1 MHz, 5 MHz, or 10 MHz |
| Time Base Output Frequency | 10 MHz |
Power
| Parameter | Value |
|---|---|
| Maximum Power Consumption | 170 VA |
Applications
Universal counter for precision frequency, time interval, and phase measurements in benchtop and automated test environments.
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